DEPARTMENT OF THE INTERIOR
UNITED STATES GEOLOGICAL SURVE

144°00'
76°00!

PREPARED BY THE

ANTARCTIC RESEARCH CENTER, THE MUSEUM

TEXAS TECH UNIVERSITY
UNDER THE AUSPICES OF THE

NATIONAL SCIENCE FOUNDATION

141°

77°00"
ves SCALE 1:250,000

Base from U.S. Geological Survey, 1973 20 Statute Miles

7 15 20 25. 30 Kilometers

— a —

10 15 Nautical Miles

Lambert Conformal Conic Projection—Standard Parallels 76°40’ and 79°20’
CONTOUR INTERVAL 200 METERS—DATUM IS MEAN SEA LEVEL

RECONNAISSANCE GEOLOGIC MAP OF THE GUTENKO NUNATAKS
QUADRANGLE, MARIE BYRD LAND, ANTARCTICA

Isogonic lines compiled from U.S. N. 0. O. By

(ES) Photogrammetric compilation

Chart 1706 S, 1970

Alton Wade, Carl A. Cathey,and Jerry B. Oldham
1978

ISOGONIC LINE DIAGRAM

77°00"

INTERIOR—GEOLOGICAL SURVEY, RESTON, VIRGINIA—197¢—G77350 138°00'

Geology mapped in 1940 by L. A. Warner and
C.F. Passel; in 1966-1967 by F. A. Wade,
V.L. Yeats, and L. V. Klimov assisted

by J.R. Wilbanks and J. Suggs

*_132"00"
75°00!

ee ee
sonatas | MOUNT

Sheet numbering system based on
International Map of the World

INDEX TO ADJOINING SHEETS

U.S. ANTARCTIC RESEARCH PROGRAM

UTENKO NUNATAKS QUADRANGLE
ANTARCTIC GEOLOGIC MAP A-11

CORRELATION OF MAP UNITS
> QUATERNARY
[ow] J AND TERTIARY

nnformity

[Kee | } CRETACEOUS

Unconformity,

MISSISSIPPIAN
AND DEVONIAN

Unconformity

1 LOWER PALEOZOIC
} AND UPPER PRECAMBRIAN

DESCRIPTION OF MAP UNI

OLIVINE BASALT FLOWS, TUFF AND OTHER PYROCLAS’
DEPOSITS.

BYRD COAST GRANITE—Biotite granite, leucogranite, and alas-
kite, equigranular to porhpyritic, marginal and local foliation,
magmatic origin. Includes associated pegmatites and aplites, and
matic dikes. Intrudes Swanson Formation and Fosdick metamor-
phic rocks. Radiometric ages mainly 100+10 m.y.

FORD GRANODIORITE—Biotite-hornblende granodiorite. Com-
position of plagioclase ranges over wide limits, probably two
generations: oligoclase-andesine and younger albite. Includes as-
sociated pegmatite, aplite and rhyolite dikes, and mafic dikes.
Intrudes Swanson Formation. Radiometric ages mainly 345+11
m.y.

[ERB] swanson FORMATION—Sequence of metamorphosed

sedimentary rocks with total thickness estimated to be in excess of
4000 m. Degree of metamorphism seldom exceeds greenschist
facies. Metagraywacke dominates sequence with lesser amounts
of biotite schist, phyllite, and slate. Not subdivided because of
insufficient field data. Late Precambrian age based upon ach-
ritarch assemblages (IItchenko, 1972)

FOSDICK METAMORPHIC ROCKS—Progressively metamor-
phosed sedimentary rocks range from biotite schist to migmatitic
granite; restricted to Fosdick Mountains. Relationship to Swanson
Formation not established; probably age equivalent of Swanson
but in a zone of higher regional metamorphism

Contact

Strike and dip of beds

REFERENCES

Fenner, C. N., 1938, Olivine fourchites from Raymond Fosdick
Mountains, Antarctica: Geol. Soc. America Bull., v. 49, no. 3, p.
367-400.

Iltchenko, L. N., 1972, Late Precambrian achritarchs of Antarctica,
in Adie, R. J. ed.,Antarctica geology and geophysics: Oslo, Uni-
versitetsforlaget, p. 599-602.

Klimov, L. V., 1972, Some results of geological investigations in
Marie Byrd Land and the Eights Coast, in Adie, R. J., ed., Antarc-
tic geology and geophysics: Oslo, Universitetsforlaget, p.
245-251

Passel, C. F., 1945, Sedimentary rocks of the southern Edsel Ford
Ranges, Marie Byrd Land, Antarctica: Am. Philos. Soc. Proc., v.
89, no. 1, p. 123-131.

Wade, F. A., 1937, Petrologic and structural relations of the Edsel
Ford Range, Marie Byrd Land, to other Antarctic mountains:
Geol. Soc. America Bull., v. 48, no. 10, p. 1387-1396.

—_______ 1972, Geologic survey of Marie Byrd Land: Antarctic
Jour. of the U.S., v. 7, no. 5, p. 144-145,

Wade, F. A and Wilbanks, J. R., 1972, Geology of Marie Byrd and
Ellsworth Lands, in Adie, R.J., ed., Antarctic geology and
geophysics: Oslo, Universitetsforlaget, p. 207-214.

Warner, L. A., 1945, Structure and petrography of the southern
Edsel Ford Ranges, Antarctica: Am. Philos. Soc. Proc., v. 89, no.
1, p. 78-122.

Wilbanks, J. R., 1972, Geology of the Fosdick Mountains, Marie
Byrd Land, in Adie, R. J., ed., Antarctic geology and geophysics:
Oslo, Universitetsforlaget, p. 277-284.

For sale by Branch of Distribution, U.S. Geological Survey,
1200 South Eads Street, Arlington, VA 22202