IODP Proposal Cover Sheet

937 - Add

Deepening Hole U1309D

Received for:

Title

Accessing the Building Blocks of Life: Deepening Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

Proponents

Andrew McCaig, Donna Blackman, Beth Orcutt, Benedicte Menez, Marvin Lilley, Geoffery Wheat, Johan
Lissenberg, Benoit Ildefonse, Frieder Klein, Susan Lang, William Seyfried, Muriel Andreani, Barbara John,
Marguerite Godard, Antony Morris, Esther Schwarzenbach, Christopher MacLeod, Ivan Savov, Natsue Abe,
Yasukiko Ohara

Keywords

serpentinization, hydrogen, methane, gabbro, fluid

Proponent
Affiliation
Country

Area

Mid-Atlantic Ridge

Proponent Information
Andrew McCaig
University of Leeds
United Kingdom✓⃞ Permission is granted to post the coversheet/site table on www.iodp.org

Abstract
The Atlantis Massif Oceanic Core Complex (OCC) is one of the best studied locations in the ocean crust, the site of four
IODP expeditions so far (304, 305, 340T and 357). It is the site of the Lost City Hydrothermal Field (LCHF), venting alkaline
fluids rich in hydrogen and methane at 40-90 centigrade. IODP Hole U1309D, located 5km north of the LCHF, is the deepest(1415m) hole so far drilled in young (<2 Ma) ocean crust, sampling a primitive series of gabbroic rocks interpreted in part tobe metasomatised peridotite. Gabbroic lithologies in Hole U1309D contrast with serpentinized peridotites sampled near the
LCHF by seafloor coring in Exp. 357 and sampling on the south wall of the Massif. The hydrologic regime is also very
different at the two locations, with deep permeability required beneath the LCHF, and a low permeability conductive regime
evidenced by a linear thermal gradient deeper than 750 mbsf in Hole U1309D.
The principle aim of this proposal is to sample fluids and rocks in a stable regime with temperatures higher than eversampled before by IODP. We hope to access temperatures above 200 centigrade, where active serpentinization is occurringin olivine-rich rocks, and where the building blocks for life (H2, CH4, and more complex organic compounds) may becreated abiotically.
In addition we will drill a short Hole close to the Lost City Hydrothermal Field in order to gain a complete section through a
detachment fault zone and address biosphere, structural and alteration objectives not completed in IODP Expedition 357
due to failure to penetrate to depths envisaged.
We will sample fluids in the existing Hole 1309D using newly developed temperature-sensitive sampling tools and leave aclean legacy hole reaching 2100 mbsf and temperatures of 220 C for future logging and fluid sampling once thermal
equilibrium has returned. H2, CH4, other organic molecules and cations will be sampled in fluid inclusions to compare with
ambient fluids. We hypothesise that concentration gradients in volatile species may exist in the Massif.
We will also study the magmatic evolution of oceanic core complexes including melt-rock reaction processes critical to theassembly and geochemistry of oceanic gabbro bodies and the relationship between plutonic rocks and MORB
Drilling to temperature regimes not previously accessed by IODP will allow the limitations of current technology to beevaluated in preparation for future deep drilling

Generated: 2021-06-04T18:21:03+00:00

937 - Add
Scientific Objectives
Our proposed drilling strategy will address a number of objectives in the Earth in Motion, Earth Connection and Biosphere Frontiers themesof the IODP Science Plan.
Objective 1: The life cycle of an oceanic core complex: Links between igneous, metamorphic, structural and fluid flow processes, andtesting of geophysical and hydrothermal models. This objective addresses Science Plan Challenge 9: "How are seafloor spreading andmantle melting linked to ocean crustal architecture?" Challenge 10: What are the mechanisms, magnitude and history of chemical
exchanges between the ocean crust and seawater" and Challenge 14: How do fluids link subseafloor tectonic, thermal, and biogeochemical
processes?
Objective 2: Accessing the chemical kitchen preceding the appearance of life on Earth: formation of organic molecules of prebiotic interest
at high and low temperatures in the Atlantis Massif. This objective addresses Science Plan challenge 10 "What are the mechanisms,
magnitude, and history of chemical exchanges between
the oceanic crust and seawater?", Challenge 13 “What properties and processes govern the flow and storage of carbon in the subseafloor”;
and Challenge 14 “How do fluids link subseafloor tectonic, thermal, and biogeochemical processes?” It will also be of great interest to the
Astrobiology Community studying hydrothermal processes on Icy Worlds and Mars
Objective 3: Deep biosphere and limits for life in the Atlantis Massif: controls of lithological substrate, porosity and permeability,
temperature, fluid chemistry and reactive gradients on microbiology. This objective concerns Science Plan Challenge 5 "What are the origin,composition, and global significance of deep
subseafloor communities?" and Challenge 6 "What are the limits of life in the subseafloor realm?"

Non-standard measurements technology needed to achieve the proposed scientific objectives
Sampling of fluids using downhole logging tools at selected intervals, in particular using shape metal alloy sampling systems currently underdevelopment
Preserving selected samples away from atmospheric alteration and potentially at near-ambient temperature above the temperature limits oflife

Have you contacted the appropriate IODP Science Operator about this proposal to discuss drilling platform
capabilities, the feasibility of your proposed drilling plan and strategies, and the required overall timetable fortransiting, drilling, coring, logging, and other downhole measurements?
yes

Generated: 2021-06-04T18:21:03+00:00

Proposal History
Submission Type

Resubmission from previously submitted proposal

Review Response
This addendum establishes a new alternate site AMDH5A, which consists of one or more single-bit holes within a polygon defined on thesite form (vertices of the polygon are listed in a table in the addendum text)
This was part of the operations plan of Proposal 937, (see Fig. 11 decision tree)
there are no changes to the Science or Operations proposed in Proposal 937FULL2, and clarified in the PRL

Generated: 2021-06-04T18:21:03+00:00

937 - Add
Proposed Sites (Total proposed sites: 4; pri: 2; alt: 2; N/S: 0)

Site Name

Position(Lat, Lon)

Water
Depth
(m)

Penetration (m)Brief Site-specific Objectives
Sed

AMDH-01A(Primary)

30.1687-42.1186

AMDH-02A(Primary)

30.1317-42.1202825

3

AMDH-03A(Alternate)30.1389-42.1455

1275

5

AMDH-05A(Alternate)30.13333-42.17000

1656

1000

Generated: 2021-06-04T18:21:03+00:00

0

3

Bsm

Total

660

(i) Sample fluids and measure temperature in existing Hole 1309D down
to 1414 mbsf (expected temperature 225 centigrade). (ii) Deepen
existing Hole U1309D by ~650 m and collect samples for petrology andgeochemistry of abiotic organic compounds and H2; (iii) log Hole withflasked tools. (iv) Drill new 80m Hole 20-30 m north of Hole U1309D, formicrobiology sampling of porous rocks, fault zones, and correlation with
Holes U1309B and D. This Hole is designated "U1309-J" in the text andsite form. Note that Hole 1309C with protruding casing needs to be
avoided.

200

203200mHole with re-entry. Complete section through detachment fault zone
in serpentinized peridotite. Sample for deformation, alteration, igneous
petrology, microbiology and organic/inorganic geochemistry. Log fortemperature and other properties. Legacy Hole for sampling fluids andgases, establishing temperature profile, potential instrumentation

200

205

Drill through detachment fault shear zone; igneous petrology, alteration,
deformation fabrics, microbiology, organic geochemistry. potential for
post-detachment volcanic rocks. Temperature profile, fluid sampling,
potential to provide re-entry system for legacy

103

Series of single bit holes. Near complete section through detachment
fault zone in serpentinized peridotite. Sample for deformation, alteration,
igneous petrology, microbiology and organic/inorganic geochemistry.
Log for temperature and other properties. Alternate site if operations failat main sites

660

100

937 - Add
Contact Information
Contact Person: Andrew McCaig
Department: School of Earth and Environment
Organization: University of Leeds
Address: Woodhouse Lane
Leeds West Yorkshire LS2 9JT United Kingdom
E-mail/Phone: a.m.mccaig@leeds.ac.uk;

Phone: +44 113 3435219

Proponent List
First Name

Last Name

Affiliation

Country

Role

Expertise

Andrew

McCaigUniversity of Leeds

United Kingdom

Principal
Lead

Donna

Blackman

UC Santa Cruz

United States

Data Leadgeophysics, heatflow

BethOrcuttBigelow Laboratory for Ocean Sciences

United States

Other Lead

Microbiology;
biogeochemistry;

Benedicte

Menez

IPGP Paris

FranceOther Leadgeomicrobiology;
geochemistry

MarvinLilleyUniversity of Washington

United States

Other Leadfluid geochemistry;hydrocarbons

Geoffery

Wheat

University of Alaska, Fairbanks

United States

Other Leadgeochemistry;
downhole sampling;hydrogeology

Johan

Lissenberg

Cardiff University

United Kingdom

Other Lead

igneous petrology

BenoitIldefonse

University of Montpellier

FranceOther Lead

igneous petrology;
tectonics; physicalproperties

Frieder

Klein

Woods Hole Oceanographic Institute

United States

Other Leadfluid geochemistry;
fluid-rock interaction

Susan

Lang

University of South Carolina

United States

Other Leadbiogeochemistry;geochemistry

WilliamSeyfried

University of Minnesota

United States

Other
Proponent

fluid geochemistry;
fluid-rock interaction

MurielAndreani

University of Lyon

FranceOther
Proponent

metamorphic petrology;
geochemistry

BarbaraJohn

University of Wyoming

United States

Other
Proponent

tectonics; petrology;
geochronology

Marguerite

GodardUniversity of Montpellier

FranceOther
Proponent

petrology;
geochemistry

AntonyMorris

University of Plymouth

United Kingdom

Other
Proponent

Palaeomagnetism; rockmagnetism; tectonics

Esther

Schwarzenbach

Free University Berlin

Germany

Other
Proponent

metamorphic petrology;
geochemistry

Christopher

MacLeod

Cardiff University

United Kingdom

Other
Proponent

tectonics, petrology

Ivan

Savov

University of Leeds

United Kingdom

Other
Proponent

geochemistry,
volcanology, petrology

NatsueAbe

Jamstec

Japan

Other
Proponent

Igneous petrology

Yasukiko

Ohara

Hydrographic and Oceanographic
Department of Japan

Japan

Other
Proponent

Marine geology andtectonics

Generated: 2021-06-04T18:21:03+00:00

Alteration, tectonics,
structural geology

IODP Proposal 937 Addendum
This addendum adds a new site, AMDH-05A, which consists of a polygon, within which we request
permission drill one or more single bit Holes, as requested already in Proposal 937Full2. The decision
tree (Fig. 11 in the above proposal document) shows that this is the final contingency if otheroperations fail.
(Note that AMDH-04 was used for an alternate Hole in proposal 937Full, which was removed inproposal 937FullL2)

There is no change in the science or operations plan requested in 937 Full2 and in the PRL.

The polygon is shown in the Site form and has been chosen to include most of the shallow Holes
drilled in IODP Expedition 357, and suitable areas of relatively flat seafloor. Experience in Expeditions
304 and 357 suggests that steeper slopes may be covered by large boulders and relatively flat areas
away from the base of slopes offer the best chance to entering the seafloor successfully. Therefore
the polygon includes a number of such areas. Hole locations would be chosen to complement theshallow holes of Expedition 357 where possible, and precise locations would be selected during the
expedition.
We have included logging in the single bit Holes, as was done in IODP U1309B

Table 1: P937 polygon vertices (11 March 2021, minor adjustment to easternmost pts relative to
EPSP/SRR) for site AMDH-05A (note that the site form lists the latitude and longitude of the firstvertex, and an average seafloor depth)
#
1
2
3
4
5
6
7
8
9
10
11
12
1

LATdeg
30
30
30
30
30
30
30
30
30
30
30
30
30

min
7.80
8.00
7.42
7.60
7.74
7.35
7.80
8.02
8.15
8.70
9.00
8.70
7.80

LONdeg
-42
-42
-42
-42
-42
-42
-42
-42
-42
-42
-42
-42
-42

min
11.28
10.20
9.50
7.20
6.75
5.65
5.72
6.90
7.35
7.30
8.50
11.00
11.28

LATdecDeg
30.13000
30.13333
30.12367
30.12667
30.12900
30.12250
30.13000
30.13367
30.13583
30.14500
30.15000
30.14500
30.13000

LONdecDeg-42.18800-42.17000-42.15833-42.12000-42.11250-42.09417-42.09533-42.11500-42.12250-42.12167-42.14167-42.18333-42.18800

IODP Site Forms

937 - Add

Form 1 – General Site Information

Section A: Proposal Information

Proposal Title

Date Form Submitted

Accessing the Building Blocks of Life: Deepening Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

2021-05-30 10:29:11

Site-Specific (i) Sample fluids and measure temperature in existing Hole 1309D down to 1414 mbsf (expected temperature
Objectives with 225 centigrade). (ii) Deepen existing Hole U1309D by ~650 m and collect samples for petrology andgeochemistry of abiotic organic compounds and H2; (iii) log Hole with flasked tools. (iv) Drill new 80m HolePriority

20-30 m north of Hole U1309D, for microbiology sampling of porous rocks, fault zones, and correlation with(Must include general
Holes U1309B and D. This Hole is designated "U1309-J" in the text and site form. Note that Hole 1309C
objectives in proposal)
with protruding casing needs to be avoided.

List Previous
Drilling in Area

Expeditions IODP 304, 305 and 357

Section B: General Site Information

Site Name:
If site is a reoccupation of an
old DSDP/ODP Site, Please
include former Site#

U1309D

Latitude:Deg:

Longitude:

Deg:

Jurisdiction: none

30.1687

Distance to Land:(km)-42.1186

Coordinate System:
Priority of Site:

Area or Location: Atlantis Massif, Mid-Atlantic Ridge

AMDH-01A

WGS 84
Primary:

Generated: 2021-06-04T18:21:03+00:00✓⃞

Alternate:⃞

Water Depth (m): 1656

Section C: Operational Information
Sediments

Basement

0660

Proposed
Penetration (m):Total Sediment Thickness (m)2

Total Penetration (m):General Lithologies:
Coring Plan:(Specify or check)gabbro, serpentinite

unconsolidated
Continuation of Expedition 305 coring. Multiple re-entry
Additional single bit Hole West of U1309D, termed "U1309-J"
APC

Wireline Logging
Plan:

660

XCB

RCB

Standard Measurements

Special Tools

✓
✓
✓
✓
✓
✓
✓

Magnetic Susceptibility

WL
Porosity
DensityGamma Ray
Resistivity
Sonic (∆t)
Formation Image (Res)

Borehole Temperature✓✓

Re-entry✓

Other
tools:

Fluid sampling hopefully using new
MTFS tool. Also the 3rd party Kuster
tool. For temperature the ETBS tool isrequested.

Formation Image(Acoustic)PCS

VSP (walkaway)
LWD

VSP (zero offset)
Formation Temperature& Pressure
Other Measurements:

Estimated Days:

Drilling/Coring:

Fluid sampling

Logging:38

2

Total On-site:

40

Observatory Plan:

Longterm Borehole Observation Plan/Re-entry Plan

Potential Hazards/
Weather:

Shallow Gas

Complicated Seabed
Condition

Hydrothermal Activity

Preferred weather window

Hydrocarbon

Soft SeabedLandslide and Turbidity
Current

December to May,
avoiding Atlantic
hurricane season

Shallow Water Flow

Currents

Gas Hydrate

Abnormal Pressure

Fracture Zone

Diapir and Mud Volcano

Man-made Objects

Fault

High Temperature

H2S

High Dip Angle

Ice Conditions

Casing with re-entry cone already in place.Hole has been re-entered many times. Hole should be left
clear for future logging and fluid sampling.

(e.g., sea-floor cables,
dump sites)✓

CO2
Sensitive marine
habitat (e.g., reefs,

none

vents)

Other:

Generated: 2021-06-04T18:21:03+00:00

maximum predicted temperature is 225 C at 2100 mbsf, based on gradient in the lower 750 m ofHole U1309DIODP Site Forms

Proposal #:937 - Add

Form 2 - Site Survey Detail

Site #:

AMDH-01A

Date Form Submitted: 2021-05-30 10:29:11

Data TypeIn SSDB

1a High resolution seismic reflection (primary)no1b High resolution seismic seismic reflection (crossing)no2a Deep penetration seismic reflection (primary)yes

Line: Meg4
Position: Meg4 , CMP 4145 closest, ~400 m to east; RP#3378 closest in
meg4_stack_2400_5280.segy

2b Deep penetration seismic reflection (crossing)yes

Line: Meg10
Position: Meg10, ~1.8 km north, CMP 2405 close perpendicular
projection

3 Seismic Velocity

yesHarding et al. 2016- Meg4 waveform inversion & updated checkshot datafrom borehole; Blackman et al. 2014- complete sonic log to ~1400 mbsf.
(older versions Canales et al. (2008) and Henig et al. (2012) Meg4
downward continued streamer tomography, former to datum above
seafloor and latter to seafloor)

4 Seismic Gridyes

Meg4, Meg5, Meg6, Meg9, Meg10- Canales et al., 2004 (Meg8 outside
corner)5a Refraction (surface)yes

OBS refraction- Blackman and Collins 2010; Line 9a crosses Site; Line 8
is 1.8 km to N

5b Refraction (bottom)

yes

NOBEL- Harding et al. 2016 waveform inversion for Line 10, just north ofhole
Collins et al. 2009 shows older tomography for Lines 9 & 10.

6 3.5 kHzno

7 Swath bathymetryyes

8a Side looking sonar (surface)no8b Side looking sonar (bottom)

yes

CD100 Tobi MARVEL2000 DSL120

9 Photography or video

yes

MARVEL 2000 Alvin and Argo images

10 Heat Flowyes

Temperature throughout borehole; from deep section heat flow prediction
is 257 mW/m2, Blackman et al., 2014

11a Magnetics

yes

11b Gravity

yes

12 Sediment cores

yes

Holes U1309A, U1309E, U1309F, U1309G

13 Rock samplingyes

CD100 Dredge, MARVEL2000 Alvin; Hole U1309D core to 1415mbsf

14a Water current datano14b Ice Conditions

no15 OBS microseismicity

no16 Navigationyes

17 Otherno

Generated: 2021-06-04T18:21:03+00:00

Details of available data and data that are still to be collected

CD100 EM12, MARVEL2000 SeaBeam2000, 100-m regional gridBlackman et al., 2008. EM120 20-50m grid Früh-Green et al., 2017.

Pariso et al., 1996; MARVEL2000 deep-tow

Blackman et al . 2008

1 yr study, Collins et al. 2012

MCS, OBS & NOBEL refraction, DSL120, Alvin rock sample & dredge
locationsIODP Site Forms

Proposal #:937 - Add

Form 4 - Environmental Protection

Site #:

AMDH-01A

Date Form Submitted: 2021-05-30 10:29:11

Pollution & Safety Hazard

Comment

1. Summary of operations at sitevisual check for flow; re-enter; slow down-run for minimally-perturbed T measure; up run for caliper& (initial) borehole fluid sampling; additional fluid sampling to cover desired intervals (if dont havemulti-sample capability); RCB coring; logging of at least newly-penetrated section, full section iftime.

2. All hydrocarbon occurrences based on
previous DSDP/ODP/IODP drillingnone

3. All commercial drilling in this area that
produced or yielded significant
hydrocarbon showsnone

4. Indications of gas hydrates at thislocationnone

5. Are there reasons to expecthydrocarbon accumulations at this site?

none

6. What "special" precautions will betaken during drilling?

minimal disturbance in hole until initial T measurement & fluid sampling are complete. During final
logging temperature needs to be monitored to avoid damge to temperature-limited logging tools

7. What abandonment procedures need
to be followed?

standard for tool stuck in hole, if that were to occur

8. Natural or manmade hazards which
may affect ship's operations~20m casing was left protruding from seafloor at Hole U1309C in 2004

9. Summary: What do you consider the
major risks in drilling at this site?

moderately high temperature as hole deepens (~150-250 °C expected)

Generated: 2021-06-04T18:21:03+00:00

IODP Site Forms

Proposal #:Form 5 - Lithologies

937 - Add

Site #:

AMDH-01A

reflectors,
Subbottom Key
depth (m) unconformities,
faults, etc

Age (My)

Assumedvelocity(km/s)

Lithology

0 - 150~1.2 Marocks

3.5

few m of fault
zone,
metadiabase,metagabbro

detachment zone

350 - 380

highly altered rock,likley reflector
source5.3

olivine-rich
troctolite, trotolite,
gabbro750 - 750

(paleo) fault

5

fault gouge,
diabase1080 1200

portions highlyaltered, possible
reflectors

5.8

oliveine-rich
troctolite(serpentinized)
interfingered
gabbro4000 4000

green reflector
Meg4

6.9

base gabbro?

Generated: 2021-06-04T18:21:03+00:00

Date Form Submitted: 2021-05-30 10:29:11

Paleo-environment

Avg. accum.
rate (m/My)

Comments

n/a

upper 20 m cased.
Age from Grimes et al(2008) applies towhole section
reflectivity modelingby Collins et al., 2009velocity control by
waveform inversion,
304/305/340T
checkshots, sonic log(Harding et al. 2016)

Harding et al 2016

M eg 4

97
22
05

01

97

30

31

05

01

97

05

01
25

25

27

28

28

MCS
Meg10

U1311A,B

4097

4001
3905

01
19

05

97
19

M0068

21

01

97

3401
M0076

22

05
24

97

AMDH−02AM0072

22

M0071

01

3497
M0069

M0073

25

05

3605

25

05

97

01
28

27

30.1333˚

30

AMDH−03A

3701

M0070
28

01
31

05

331209
97

33

97

01
34

36

05

3797

34

97

01
37

37

05

4301 U1309G,H
ORB2
4205

M0074

C protuding casing
A/B
39

U1309FU1309A−E

AMDH−01A

N

30.15˚

M0073

Exp 304
Lost City
MCS Line
w/CMP#

4505

24

22

0

U1309FExp 357

4601

Meg5

E

AMDH-1A
D

4697

4397

NOBEL
1

-J
30.1667˚

97

M eg 6

OBH25

10 m

Line Meg 4 Stack

NOBEL
9

OBH16

Site 1309, Hole U1309_

01
22

97

05

30.1833˚

21

4

19

OBS
Line 8

05

3

19

30.2˚

18

(Harding et al. 2016)

2

01

IODP 937 Full-2, Site Figure AMDH-01A
1601

N km/s16
97

MCS Line Meg 4
Waveform Inversion

H MD
A

13
97

9D
30 A
U1 -01
H

15
05

1

ole

12

D
AM

13
0

Depth (km)

2A

H-0

S

Meg9

3305

30.1167˚Interpreted Reverse Time Migration(Harding et al. 2016)−42.2˚−42.1833˚

5.25 km/s
contourbase
gabbroic
body?

1

OBH16

OBH25

ORB2

OBH22

ORB1 OBS50

OBH26

central dome

outsidecorner

AMDH-01A projection

depth (km)Depth (km)crustmantletransition
zone?

OBS64

rift
axis

7
6
5

5

4
3
2

Blackman & Collins, GRL 2010

10
-20

-10

0

10

distance (km)20−42.15˚−42.1333˚
meters−5000

0 Line8b−42.1667˚velocity(km/s)

−4000

−3000

−2000

−42.1167˚−42.1˚

−42.0833˚−42.0667˚

25-m contour interval, 100-m heavy−1000

Uninterpreted, zoomed , Reverse Time Migration
Hole U1309D (solid), AMDH-01A (dash)

2
3
4

5
Refl.
Pt # 3000

3500

4000

MCS: meg4_stack_2400_5280.segy (correct nav), meg4migrated.segy (needs nav),meg4.cdp_nav_bt_twtt
Refraction: obs64ch*n08.segy, obh16n8r.segy, obh25n8r.segy, orb2n08.segy,
obh22n8r.segy, orb1n08.segy, obs50ch*n08cor.segy, obh26n8r.segy

IODP Site Forms

937 - Add

Form 1 – General Site Information

Section A: Proposal Information

Proposal Title

Date Form Submitted

Accessing the Building Blocks of Life: Deepening Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

2021-05-30 10:29:11

Site-Specific 200mHole with re-entry. Complete section through detachment fault zone in serpentinized peridotite. Sample
Objectives with for deformation, alteration, igneous petrology, microbiology and organic/inorganic geochemistry. Log fortemperature and other properties. Legacy Hole for sampling fluids and gases, establishing temperature
Priority(Must include generalobjectives in proposal)

List Previous
Drilling in Area

profile, potential instrumentation

IODP Expedition 357, IODP Expedition 304/305

Section B: General Site Information

Site Name:
If site is a reoccupation of an
old DSDP/ODP Site, Please
include former Site#

50m from MOO69A

Latitude:Deg:

Longitude:

Deg:

Jurisdiction: common

30.1317

Distance to Land:(km)-42.1202

Coordinate System:
Priority of Site:

Area or Location: Mid Atlantic Ridge, Atlantis Massif

AMDH-02A

WGS 84
Primary:

Generated: 2021-06-04T18:21:03+00:00✓⃞

Alternate:⃞

Water Depth (m): 825

Section C: Operational Information
Sediments

Basement

3200

Proposed
Penetration (m):Total Sediment Thickness (m)3Total Penetration (m):General Lithologies:
Coring Plan:(Specify or check)serpentite, talc-tremolite chlorite schist,
metadiabase, metagabbro, breccia, fault rockloose foram sandPilot Hole 50m; hard rock re-entry system with ~15m casing; 2-bit Hole to 200m
APC

Wireline Logging
Plan:

203

XCB

RCB

Standard Measurements

Special Tools

✓
✓
✓
✓
✓
✓
✓

Magnetic Susceptibility

WL
Porosity
DensityGamma Ray
Resistivity
Sonic (∆t)
Formation Image (Res)

Borehole Temperature✓✓

Re-entry✓

Other
tools:

MTT tool, ETBS tool, WSTP tool,
potentially Kuster tool (exact choice oftools may be an operational choice)Formation Image(Acoustic)PCS

VSP (walkaway)
LWD

VSP (zero offset)
Formation Temperature& Pressure
Other Measurements:

Estimated Days:

Drilling/Coring:

5.1

Logging:

Observatory Plan:

Longterm Borehole Observation Plan/Re-entry Plan

Potential Hazards/
Weather:

Shallow Gas

Complicated Seabed
Condition

Hydrocarbon

0.5

Total On-site:

5.6

Hard rock re-entry system. Potential for observatory✓ Hydrothermal Activity

Preferred weather window

Soft SeabedLandslide and Turbidity
Current

December to May(avoiding Atlantic
hurricane season)

Shallow Water Flow

Currents

Gas Hydrate

Abnormal Pressure

Fracture Zone

Man-made Objects(e.g., sea-floor cables,
dump sites)

H2S✓ Fault
High Dip Angle✓ Diapir and Mud Volcano✓ High Temperature
Ice Conditions

CO2
Sensitive marine
habitat (e.g., reefs,

Lost City Hydrothermal Field is ~0.5 km away

vents)

Other:

Generated: 2021-06-04T18:21:03+00:00

Pieces of RD2 drill string left in MOO69A may not be visible. Hardrock seabed with rubble andsmall sediment ponds

IODP Site Forms

Proposal #:937 - Add

Form 2 - Site Survey Detail

Site #:

AMDH-02A

Date Form Submitted: 2021-05-30 10:29:11

Data TypeIn SSDB

1a High resolution seismic reflection (primary)no1b High resolution seismic seismic reflection (crossing)no2a Deep penetration seismic reflection (primary)yes

Line: Meg4 ,Position: CMP# 3480 closest, 190 m to east; ~RP# 2726 in
meg4_stack_2400_5280.segy

2b Deep penetration seismic reflection (crossing)yes

Line: Meg9
Position: CMP 2750, 375 m north

3 Seismic Velocity

yesHarding et al. 2016 & in prep- Meg4 & Meg9 waveform inversion (older
version Henig et al. 2012 Meg4 & 9 downward continued to seafloor
streamer tomography)

4 Seismic Gridyes

Meg4, Meg5, Meg6, Meg9, Meg10- Canales et al., 2004 (Meg8 outside
corner)5a Refraction (surface)yes

OBS refraction- Blackman and Collins 2010; Line 9a near site

5b Refraction (bottom)

no6 3.5 kHzno

7 Swath bathymetryyes

8a Side looking sonar (surface)no8b Side looking sonar (bottom)

yes

CD100 Tobi MARVEL2000 DSL120

9 Photography or video

yes

MARVEL 2000 Alvin and Argo images

10 Heat Flowno11a Magnetics

yes

Pariso et al., 1996; MARVEL2000 deep-tow

11b Gravity

yesBlackman et al., 2008

12 Sediment coresno13 Rock samplingyes

14a Water current datano14b Ice Conditions

no15 OBS microseismicity

no1 yr study, Collins et al. 201216 Navigation

yes

MCS, OBS refraction, DSL120, Alvin rock sample & dredge locations

17 Otherno

Generated: 2021-06-04T18:21:03+00:00

Details of available data and data that are still to be collected

CD100 EM12, MARVEL2000 SeaBeam2000, 100-m regional gridBlackman et al., 2008. EM120 20-50m grid Früh-Green et al., 2017.

CD100 Dredge, MARVEL2000 Alvin; Exp357 Holes M0069A; M0072A,B;
M0076A,BIODP Site Forms

Proposal #:937 - Add

Form 4 - Environmental Protection

Site #:

AMDH-02A

Date Form Submitted: 2021-05-30 10:29:11

Pollution & Safety Hazard

Comment

1. Summary of operations at site

RCB pilot Hole 50m; Hard rock re-entry system with ~17 m casing; RCB to 100mbsf; temperaturelog at end of drilling and logging, temperature, and fluid sampling at end of expedition

2. All hydrocarbon occurrences based on
previous DSDP/ODP/IODP drillingnone

3. All commercial drilling in this area that
produced or yielded significant
hydrocarbon showsnone

4. Indications of gas hydrates at thislocationnone

5. Are there reasons to expecthydrocarbon accumulations at this site?

none

6. What "special" precautions will betaken during drilling?

none

7. What abandonment procedures need
to be followed?

standard

8. Natural or manmade hazards which
may affect ship's operations

junk in Hole M0069A

9. Summary: What do you consider the
major risks in drilling at this site?

serpentinite fault zone so drilling conditions may be difficult

Generated: 2021-06-04T18:21:03+00:00

IODP Site Forms

Proposal #:Form 5 - Lithologies

937 - Add

reflectors,
Subbottom Key
depth (m) unconformities,
faults, etc

Age (My)

0 - 6.50Site #:

AMDH-02A

Assumedvelocity(km/s)

Lithology

Date Form Submitted: 2021-05-30 10:29:11

Paleo-environment

Avg. accum.
rate (m/My)

Comments

loose carbonate
sand in pockets.
rubble possible

Based on M0069A,
50 m away, but
sediment pockets
very variable

6.5 - 121

metadiabase

based on M0069A.
Good recovery in thissection, but may notoccur based onmoderately dipping
contact

12.5 13.2

1

sub-horizontal fault
zone and breccia

based on M0069A.
Similar fault zones
likely throughout
sectionheterogeneous
fault/shear zone
dominated byserpentinite

13-16.5 mbsf sectionin M0069A was
massive serpentinite
with good recovery

13.2 - 100

Generated: 2021-06-04T18:21:03+00:00

20m_march2018.grd
05

km/s

3000

2000

1000

ORB2

OBH16

depth (0-5 km)a-02 ed)DH
AM roject
(p

e9b

1

Depth (km)

Lin

orb

30.2333˚

−3000

966

986 961U1309D

ob
0

2

−2

30.1667˚

b3

1011

1016

2.0
3150

3320

CMP#

3490

3660

30.100˚

931−1000
00
0

or

936

−1

30.1333˚

1.5

941

1006

a

(mod. Canales
et al. 2004)

951 26h996
ob
AMDH-02A
946
6
1001
h1
ob

Line9

A

02

H-

D
AM

500 m

00

3000 RP#

2500

956

991

h2

0

Two-way Travel Time (sec)05

distance( -8 to 9 km)

D
AM

00

Meg4, uninterpreted
Reverse Time Migration

9D

30

U1

−2

MCS: meg9migrated.segy, meg9stack.segy,
meg9.cdp_nav_bat_twtt,meg4_stack_2400_5280.segy (correctnav), meg4migrated.segy (needs nav), meg4.cdp_nav_bt_twtt
Refraction: orb1n09.segy, obh16n9.segy, obh26n9.segy,
orb2n09.segy

le

Ho

ORB1

A

02
H-

Meg4 Stack, zoom

distance along MCS Line Meg4 (km)OBH26

30.2000˚

1.0

21

25-m contour interval, 100-m heavy

Blackman & Collins, GRL 2010

(mod.Harding et al., 2016)base
gabbroic
body?

Meg9

−42.0833˚−42.1˚−42.1167˚

Line9a5.25
km/s
contour

01
22

22

97

24

M0068

atlantis.grd

metersMeg4 Waveform Inversion
zoom section

1500
1000 m
20m contours

3305

Meg10

U1309D

01

3401M0076−42.1333˚−42.15˚

distance along Meg4 (km)Depth (km)-42.1167°

1505−42.1667˚

depth
(km)

97
25

AMDH−02A
M0072

1697

N

02A

AMDH-2A

05
27

01

30

28

3497
M0069

1601

HAMD

Meg9

3605

28

05

01

M0071

Depth (km)

1901

1805

30.1333˚Interpreted Reverse Time Migration

3701

25

22
97

31

33

km/s

S

1997

M0070

AMDH−03A

Meg4 Waveform Inversion(mod. Harding et al. 2016)

200 m

30.1333°

3797

97

05

01

Lost City
MCS Line
w/CMP#

34

Meg6

M0073

Exp 357

30.15˚

Meg4

IODP 937 Full-2, Site Figure AMDH-02A

09

E

32

W

2

orb

926
921

−42.1667˚ −42.1333˚ −42.1000˚

IODP Site Forms

937 - Add

Form 1 – General Site Information

Section A: Proposal Information

Proposal Title

Date Form Submitted

Accessing the Building Blocks of Life: Deepening Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

2021-05-30 10:29:11

Site-Specific Drill through detachment fault shear zone; igneous petrology, alteration, deformation fabrics, microbiology,
Objectives with organic geochemistry. potential for post-detachment volcanic rocks. Temperature profile, fluid sampling,
potential to provide re-entry system for legacy
Priority(Must include generalobjectives in proposal)

List Previous
Drilling in Area

IODP Exp 357; IODP Exp 304/305

Section B: General Site Information

Site Name:

Area or Location: Mid Atlantic Ridge, Atlantis Massif

AMDH-03A

If site is a reoccupation of an
old DSDP/ODP Site, Please
include former Site#

Latitude:Deg:

Longitude:

Deg:

Distance to Land:(km)-42.1455

Coordinate System:
Priority of Site:

Jurisdiction: common

30.1389

WGS 84
Primary:

Generated: 2021-06-04T18:21:03+00:00⃞

Alternate:✓⃞

Water Depth (m): 1275

Section C: Operational Information
Sediments

Basement

5200

Proposed
Penetration (m):Total Sediment Thickness (m)5Total Penetration (m):General Lithologies:
Coring Plan:(Specify or check)serpentite, talc-tremolite chlorite schist,
metadiabase, metagabbro, breccia, fault rockloose foram sand; carbonate cemented breccia

single bit to destruction, but if AMDH-01A fails completely, deeper Hole with re-entry. Sediment thickness is likely
maximum based on previous Holes (M0070; M0071, Site U1309)
APC

Wireline Logging
Plan:

205

XCB

RCB

Standard Measurements

Special Tools

✓
✓
✓
✓
✓
✓
✓

Magnetic Susceptibility

WL
Porosity
DensityGamma Ray
Resistivity
Sonic (∆t)
Formation Image (Res)

Borehole Temperature✓✓

Re-entry

Other
tools:

Formation Image(Acoustic)

PCS

MTT, ETBS for temperature. Kuster
and/or WSTP tool for fluid sampling(temperature probably too low to use
new SMA tool)

VSP (walkaway)
LWD

VSP (zero offset)
Formation Temperature& Pressure
Other Measurements:

Estimated Days:

Drilling/Coring:

Logging:4

1

Total On-site:

5

Observatory Plan:

Longterm Borehole Observation Plan/Re-entry Plan

Potential Hazards/
Weather:

Shallow Gas

Complicated Seabed
Condition

Hydrothermal Activity

Preferred weather window

Hydrocarbon

Soft SeabedLandslide and Turbidity
Current

December to May(avoiding Atlantic
hurricane season)

Shallow Water Flow

Currents

Gas Hydrate

Abnormal Pressure

Fracture Zone

Man-made Objects

Fault

H2S

High Dip Angle

depending on time, a re-entry system may be installed with potential for future instrumentation(e.g., sea-floor cables,
dump sites)

CO2
Sensitive marine
habitat (e.g., reefs,

vents)

Other:

Generated: 2021-06-04T18:21:03+00:00✓ Diapir and Mud Volcano✓ High Temperature
Ice Conditions

IODP Site Forms

Proposal #:937 - Add

Form 2 - Site Survey Detail

Site #:

AMDH-03A

Date Form Submitted: 2021-05-30 10:29:11

Data TypeIn SSDB

1a High resolution seismic reflection (primary)no1b High resolution seismic seismic reflection (crossing)no2a Deep penetration seismic reflection (primary)yes

Line: Meg9
Position: ~CMP 3125

2b Deep penetration seismic reflection (crossing)yes

Line: Meg6
Position: ~600m to east

3 Seismic Velocity

yesHarding et al. 2016 & in prep- Meg9 waveform inversion (older version
Henig et al. 2012 Meg9 downward continued to seafloor streamer
tomography)

4 Seismic Gridyes

Meg4, Meg5, Meg6, Meg9, Meg10- Canales et al., 2004 (Meg8 outside
corner)5a Refraction (surface)yes

OBS refraction- Blackman and Collins 2010; Line 9b closest to site

5b Refraction (bottom)

no6 3.5 kHzno

7 Swath bathymetryyes

8a Side looking sonar (surface)no8b Side looking sonar (bottom)

yes

CD100 Tobi MARVEL2000 DSL120

9 Photography or video

yes

MARVEL 2000 Alvin and Argo images

10 Heat Flowno11a Magnetics

yes

Pariso et al., 1996; MARVEL2000 deep-tow

11b Gravity

yesBlackman et al 2008

12 Sediment coresno13 Rock samplingyes

14a Water current datano14b Ice Conditions

no15 OBS microseismicity

no1 yr study, Collins et al. 201216 Navigation

yes

MCS, OBS refraction, DSL120, Alvin rock sample & dredge locations

17 Otherno

Generated: 2021-06-04T18:21:03+00:00

Details of available data and data that are still to be collected

CD100 EM12, MARVEL2000 SeaBeam2000, 100-m regional gridBlackman et al., 2008. EM120 20-50m grid Früh-Green et al., 2017.

CD100 Dredge, MARVEL2000 Alvin; Exp 357 cores, M0070A-c andM0071A to C most relevant

IODP Site Forms

Proposal #:937 - Add

Pollution & Safety Hazard
1. Summary of operations at site
2. All hydrocarbon occurrences based on
previous DSDP/ODP/IODP drilling
3. All commercial drilling in this area that
produced or yielded significant
hydrocarbon shows
4. Indications of gas hydrates at thislocation
5. Are there reasons to expecthydrocarbon accumulations at this site?
6. What "special" precautions will betaken during drilling?
7. What abandonment procedures need
to be followed?
8. Natural or manmade hazards which
may affect ship's operations
9. Summary: What do you consider the
major risks in drilling at this site?

Generated: 2021-06-04T18:21:03+00:00

Form 4 - Environmental Protection

Site #:

Comment

AMDH-03A

Date Form Submitted: 2021-05-30 10:29:11

IODP Site Forms

Proposal #:Form 5 - Lithologies

937 - Add

reflectors,
Subbottom Key
depth (m) unconformities,
faults, etc

Age (My)N/A

Generated: 2021-06-04T18:21:03+00:00

Site #:

AMDH-03A

Assumedvelocity(km/s)

Lithology

Date Form Submitted: 2021-05-30 10:29:11

Paleo-environment

Avg. accum.
rate (m/My)

Comments

distance (km)

S

TWTT

km/s

-8

5
4
3
2

22
97

05

05

01

21

22

22

97

25

24

01

97

27

28

05

01

97

25

e9b

1

Line 9b
central(solidarrow)(dashedarrow,
profileat left)

−3000

2

4

5

7

ORB1

2

N
or

4

6

8

6

h2

ob

946

6

h1

ob

U1309D
941
936

1011

b3 AMDH-03A

1016

4
2
0
distance (km)

951

996

1006

Refraction Line 9b

oj)
A (pr

3

-2

956

991

h2

1001

30.1˚

-4

ob

8

velocity (km/s)

3

H-0
AMD

6

1

orb

966

986 961

30.2˚

2

5

meters−1000

Line 9acentral

9b
south

OBH22

ORB3

1

depth (km)6

MCS: meg9migrated.segy, meg9stack.segy,
meg9.cdp_nav_bat_twtt
Refraction: orb3n09.segy, obh22n9.segy, orb1n09.segy
Velocity models (waveform inversion): Meg9velModel.txt

9a
south

0

7

CMP #

0

same color and VE scale as Meg 9 zoom but
slightly different than both in Meg 4 velocity
zoom on AMDH-02A Site Figure

AMDH-03A

−2000

0

-10

−3000

E

Meg9

2.0

−4000

Lin

AMDH-02A

1.0

2.0

200 m

W

−5000

00
0

2

Meg 4 FWI near
Meg9 crossing,velocity zoom

00

A

3
-0

DH
AM

3

Depth (km)(data Canales et al., 2004)−42.0833˚−42.1˚−42.1167˚

000−2

Two-Way Travel Time (sec)

1.0

Meg 9 Stack−42.1333˚−42.15˚

25-m contour interval, 100-m heavy

-4

A
02
H- j)
D
o
AM (pr

Meg9

M0068

3305

subseafloor depth (km)

Meg4

Meg6
-6

-8

3401M0076−1

Depth (km)

2

1697

1505

−42.1667˚

2.0

3497
M0069

AMDH−02A
M0072

1601

5
4

3

3605

a

A

-03

DH
AM

1901

Line9

Meg 9 FWI
velocity zoom

3701

−2

1.0

1997

28

33
05

M0071

Distance along Meg9 (km)AMDH-02A
km/s(proj)Exp 357
Lost City
MCS Line
w/CMP#

1805

30.1333˚

M0073

3797

M0070

AMDH−03A

Meg4

2.0

Meg4

Meg6

30.15˚
34
01

D
AM

30
05

1.0

km/s

31
01

AMDH-02A(proj)

A

03
H-

Meg6

Depth (km)(Harding, in prep)

IODP 937 Full-2, Site Figure AMDH-03A

E

32
09

Meg 9 Full Waveform Inversion Velocity

W931−1000

2

orb

926

921

−42.1667˚ −42.1333˚ −42.1000˚

IODP Site Forms

937 - Add

Form 1 – General Site Information

Section A: Proposal Information

Proposal Title

Date Form Submitted

Accessing the Building Blocks of Life: Deepening Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

2021-05-30 10:29:11

Site-Specific Series of single bit holes. Near complete section through detachment fault zone in serpentinized peridotite.
Objectives with Sample for deformation, alteration, igneous petrology, microbiology and organic/inorganic geochemistry. Log
for temperature and other properties. Alternate site if operations fail at main sites
Priority(Must include generalobjectives in proposal)

List Previous
Drilling in Area

IODP Expedition 357, IODP Expedition 304/305

Section B: General Site Information

Site Name:

Area or Location: Mid Atlantic Ridge, Atlantis Massif

AMDH-05A

If site is a reoccupation of anis a polygon containing various IODP 357 sites
old DSDP/ODP Site, site
Pleaseinclude former Site#

Latitude:Deg:

Longitude:

Deg:

Distance to Land:(km)-42.17000

Coordinate System:
Priority of Site:

Jurisdiction: common

30.13333

WGS 84
Primary:

Generated: 2021-06-04T18:21:03+00:00⃞

Alternate:✓⃞

Water Depth (m): 1000

Section C: Operational Information
Sediments

Basement

3

100

Proposed
Penetration (m):Total Sediment Thickness (m)3Total Penetration (m):General Lithologies:
Coring Plan:(Specify or check)serpentite, talc-tremolite chlorite schist,
metadiabase, metagabbro, breccia, fault rockloose foram sandseveral single bit holes selected to complement Exp 357 shallow drilling
APC

Wireline Logging
Plan:

103

XCB

RCB

Standard Measurements

Special Tools

✓
✓
✓
✓
✓
✓
✓

Magnetic Susceptibility

WL
Porosity
DensityGamma Ray
Resistivity
Sonic (∆t)
Formation Image (Res)

Borehole Temperature✓✓✓

Re-entry

PCS

Other
tools:

MTT tool, ETBS tool, WSTP tool,

0.5

Total On-site:

Formation Image(Acoustic)
VSP (walkaway)
LWD

VSP (zero offset)
Formation Temperature& Pressure
Other Measurements:

Estimated Days:

Drilling/Coring:

Logging:

20

Observatory Plan:

Longterm Borehole Observation Plan/Re-entry Plan

Potential Hazards/
Weather:

Shallow Gas

Complicated Seabed
Condition

Hydrocarbon

20.5✓ Hydrothermal Activity

Preferred weather window

Soft SeabedLandslide and Turbidity
Current

December to May(avoiding Atlantic
hurricane season)

Shallow Water Flow

Currents

Gas Hydrate

Abnormal Pressure

Fracture Zone

Man-made Objects(e.g., sea-floor cables,
dump sites)

H2S✓ Fault
High Dip Angle✓ Diapir and Mud Volcano✓ High Temperature
Ice Conditions

CO2
Sensitive marine
habitat (e.g., reefs,

vents)

Other:

Generated: 2021-06-04T18:21:03+00:00

Lost City Hydrothermal Field is ~0.5 km away from the polygon
edge

Pieces of RD2 drill string left in some Exp 357 holes may not be visible. Hardrock seabed withrubble and small sediment ponds

IODP Site Forms

Proposal #:937 - Add

Form 2 - Site Survey Detail

Site #:

AMDH-05A

Date Form Submitted: 2021-05-30 10:29:11

Data TypeIn SSDB

1a High resolution seismic reflection (primary)no1b High resolution seismic seismic reflection (crossing)no2a Deep penetration seismic reflection (primary)yes

Line: Meg4 ,Position: CMP# 3480 closest, 190 m to east; ~RP# 2726 in
meg4_stack_2400_5280.segy

2b Deep penetration seismic reflection (crossing)yes

Line: Meg9
Position: CMP 2750, 375 m north

3 Seismic Velocity

yesHarding et al. 2016 & in prep- Meg4 & Meg9 waveform inversion (older
version Henig et al. 2012 Meg4 & 9 downward continued to seafloor
streamer tomography)

4 Seismic Gridyes

Meg4, Meg5, Meg6, Meg9, Meg10- Canales et al., 2004 (Meg8 outside
corner)5a Refraction (surface)yes

OBS refraction- Blackman and Collins 2010; Line 9a near site

5b Refraction (bottom)

no6 3.5 kHzno

7 Swath bathymetryyes

8a Side looking sonar (surface)no8b Side looking sonar (bottom)

yes

CD100 Tobi MARVEL2000 DSL120

9 Photography or video

yes

MARVEL 2000 Alvin and Argo images

10 Heat Flowno11a Magnetics

yes

Pariso et al., 1996; MARVEL2000 deep-tow

11b Gravity

yesBlackman et al., 2008

12 Sediment coresno13 Rock samplingyes

14a Water current datano14b Ice Conditions

no15 OBS microseismicity

no1 yr study, Collins et al. 201216 Navigation

yes

MCS, OBS refraction, DSL120, Alvin rock sample & dredge locations

17 OthernoBecause this site is an area rather than a specific point, the data uploaded
for AMDH-2A and AMDH-3A is sufficiently representative

Generated: 2021-06-04T18:21:03+00:00

Details of available data and data that are still to be collected

CD100 EM12, MARVEL2000 SeaBeam2000, 100-m regional gridBlackman et al., 2008. EM120 20-50m grid Früh-Green et al., 2017.

CD100 Dredge, MARVEL2000 Alvin; Exp357 Holes M0069A; M0072A,B;
M0076A,BIODP Site Forms

Proposal #:937 - Add

Form 4 - Environmental Protection

Site #:

AMDH-05A

Date Form Submitted: 2021-05-30 10:29:11

Pollution & Safety Hazard

Comment

1. Summary of operations at site

RCB to 100mbsf; logging at end of drilling for each hole with sufficient depth

2. All hydrocarbon occurrences based on
previous DSDP/ODP/IODP drillingnone

3. All commercial drilling in this area that
produced or yielded significant
hydrocarbon showsnone

4. Indications of gas hydrates at thislocationnone

5. Are there reasons to expecthydrocarbon accumulations at this site?

none

6. What "special" precautions will betaken during drilling?

none

7. What abandonment procedures need
to be followed?

standard

8. Natural or manmade hazards which
may affect ship's operations

junk in some Exp 357 holes

9. Summary: What do you consider the
major risks in drilling at this site?

serpentinite fault zone so drilling conditions may be difficult

Generated: 2021-06-04T18:21:03+00:00

IODP Site Forms

Proposal #:Form 5 - Lithologies

937 - Add

reflectors,
Subbottom Key
depth (m) unconformities,
faults, etc

Age (My)

0 - 6.50Site #:

AMDH-05A

Assumedvelocity(km/s)

Lithology

Date Form Submitted: 2021-05-30 10:29:11

Paleo-environment

Avg. accum.
rate (m/My)

Comments

loose carbonate
sand in pockets.
rubble possible

Based on M0069A,
50 m away, but
sediment pockets
very variable

6.5 - 121

metadiabase

based on M0069A.
Good recovery in thissection, but may notoccur based onmoderately dipping
contact

12.5 13.2

1

sub-horizontal fault
zone and breccia

based on M0069A.
Similar fault zones
likely throughout
sectionheterogeneous
fault/shear zone
dominated byserpentinite

13-16.5 mbsf sectionin M0069A was
massive serpentinite
with good recovery

13.2 - 100

Generated: 2021-06-04T18:21:03+00:00

4301

2

U1309FU1309A−E
4097

M0074

4001

50

0

−2000

e
on Outlin
Site Polyg

3797−42.1667˚−42.1833˚

MCS: meg9migrated.segy, meg9stack.segy, meg9.cdp_nav_bat_twtt
Velocity models (waveform inversion): Meg9velModel.txt, Meg6velModel.txt,
Meg4velModel.txt

3

2

1

km

−42.1˚

97

01
19

19

05

01
22

97

05
22

24

01

97

−42.1167˚

Meg9−42.0833˚Contour interval 25 m, 100 m heavy
20-m bathymetry grid: 20mresampledNaN.grd
Site Polygon vertices: P937polyLL.txt(Canales et al., EPSL 2004)

TWTT (sec)E−42.1333˚−42.15˚

MCS Stack Section

E

00
(p 68
ro
jec

te
d)

4

M
W

25

25

−1 3305000

5Site AMDH-05A

M0068

−1500

00

W

05

3401
M0076

−15

−42.2˚baatif

AMDH−02A
M0072

M0071

ym
th

0

yg

−1000

M0069 3497

M0073

ar

in
cts

50

rid

3605

27

01
28

28

97

05
30

31

01

40

05

09
32

33

M0070

AMDH−03A

30.1333˚

00

3701

1

97

−1
50
30

34

Site
AMDH-05A

etr

−1
5

05

97

01

36

37

37

39

30.15˚

−2

3905

05

4

21

−1

U1309G,H

0
00
−2

3

Lost CityMCS U1311A,B
Line
w/CMP#

4205

AMDH−01A

30.1667˚

M0073

Exp 357

4397

22
97

Meg6

Site AMDH-05A

1

Meg4

IODP 937 Addendum-2, Site Figure AMDH-05A

100 m
single example
fo-bit penetra r ation

Site AMDH-05A