cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.806677
title: (Table 1) Details on the Uranium/Thorium age determinations carried out on core GeoB11569-2

description: Cold-water corals are widely distributed along the Atlantic continental margin with varying growth patterns in relation to their specific environment. Here, we investigate the long-term development of cold-water corals that once thrived on a low-latitude (17°40'N) cold-water coral mound in the Banda Mound Province off Mauritania during the last glacial-interglacial cycle. U/Th dates obtained from 20 specimens of the cold-water coral Lophelia pertusa, revealed three distinct periods of coral growth during the last glacial at 65 to 57 kyr BP, 45 to 32 kyr BP and 14 kyr BP, thus comprising the cool periods of Marine Isotopic Stages (MIS) 2-4. These coral growth periods occur during periods of increased productivity in the region, emphasizing that productivity seems to be the major steering factor for coral growth off Mauritania, which is one of the major upwelling regions in the world. This pattern differs from the well studied coral mounds off Ireland, where the current regime predominantly influences the prosperity of the cold-water corals. Moreover, coral growth off Ireland takes place during rather warm interglacial and interstadial periods, whereas off Mauritania coral growth is restricted to glacial and stadial periods. However, the on-mound sedimentation patterns off Mauritania largely resemble the observations reported from the Irish mounds. The bulk of the preserved sediments derives from periods of coral growth, whereas during periods without corals hardly any net sedimentation or mound growth took place.
description: U-series ages of 20 samples of Lophelia pertusa from a gravity core obtained from the flank of a cold-water-coral mound in the Banda Mound Province on the Mauritanian slope.
description: Supplement to: Eisele, Markus Hermann; Frank, Norbert; Wienberg, Claudia; Hebbeln, Dierk; López Correa, Matthias; Douville, Eric; Freiwald, André (2011): Productivity controlled cold-water coral growth periods during the last glacial off Mauritania. Marine Geology, 280(1-4), 143-149
DOI: 10.1594/pangaea.858199
title: (Table 5) Lu-Hf isotope composition of zircon from granitic rocks from the Shackleton Range

description: (a) 176Yb/177Hf=(176Yb/173Yb)true x (173Yb/177Hf)meas x (Mi73(Yb)/Ml77(Hf))^Hf^ P(Hf) = ln(179Hf/177Hf true/179Hf/177Hfmeasured)/ln (M179(Hf)/M177(Hf)), M = mass of respective isotope. The 176Lu/177Hfwere calculated in a similar way by using the 175Lu/177Hfand (3(Yb). Quoted uncertainties (absolute) relate to the last quoted figure. The effect of the inter-element fractionation on the Lu/Hfwas estimated to be about 6% or less based on analyses of the GJ-1 and Plesovice zircons.(b) Uncertainties are quadratic additions of the within-run precision and the daily reproducibility of the 40ppb-JMC475 solution. Uncertainties for the JMC475 is 2 standard deviation, (c) Initial 176Hf/177Hf and epsilon Hf calculated using the age determined by LA-ICP-MS dating (see column f), and the CHUR parameters: 176Lu/177Hf= 0.0336, and 176Hf/177Hf=0.282785 (Bouvier et al., 2008). (d)Two stage model age in billion years using the measured 176Lu/177Lu of each spot (first stage = age of zircon), a value of 0.0113 for the average continental crust (second stage), and a depleted mantle 176Lu/177Hf and 176Hf/177Hf of 0.0384 and 0.28325, respectively (see Gerdes and Zeh, 2006 for details and references),
DOI: 10.1594/pangaea.767482
title: Hafnium isotope composition of zircons in ODP Hole 188-1167A sample 1167 A-37
DOI: 10.1594/pangaea.767483
title: Hafnium isotope composition of zircons in ODP Hole 188-1167A sample 1167 A-39
DOI: 10.1594/pangaea.704734
title: (Table 5) U-Pb zircon results of migmatitic gneiss G8-59.1 from Drake Head, northern Oates Land

description: Calibration error of reference zircon: 1.26% (n=17)
DOI: 10.1594/pangaea.767485
title: Hafnium isotope composition of zircons in ODP Hole 119-741A sample JJV741A
DOI: 10.1594/pangaea.704735
title: (Table 6) U-Pb zircon results of granitic dyke G8-59.3 from Drake Head, northern Oates Land

description: Calibration error of reference zircon: 1.68% (n=18)
DOI: 10.1594/pangaea.913993
title: Meteoric 10Be concentrations and OSL depositional ages of Rio Bermejo floodplain sediment

description: To determine the depositional age and the long-term delivery of meteoric 10Be (10Bem) to the Rio Bermejo floodplain (northern Argentina), we collected floodplain sediment samples at four locations identified as point bars of abandoned Rio Bermejo channels. We used a stainless-steel hand auger to collect sediment down to a maximum depth of ~5 m, or until refusal. For 10Bem and 9Bereac analysis, we extracted samples that integrated material from 0-20 cm below the surface, 20-50 cm, and regularly spaced 40 cm intervals for lower depths. We homogenized the material prior to packing into clean plastic bags. Sediment particle size distributions were measured on ~10 mg aliquots using a laser diffraction particle size analyzer (Horiba LA-950). The total reactive phase, including amorphous oxyhydroxides and crystalline oxide grain coatings, was extracted from the sediment samples using a procedure adapted from Wittmann et al. (2012, doi:10.1016/j.chemgeo.2012.04.031). 10Be was purified from the extracted material, spiked with a 9Be carrier solution containing 150 µg of 9Be, and packed into targets for AMS measurement at the University of Cologne Centre for Accelerator Mass Spectrometry (Cologne, Germany). 10Be/9Be measurements were normalized to the KN01-6-2 and KN01-5-3 standards (Dewald et al., 2013, doi:10.1016/j.nimb.2012.04.030) that are consistent with a 10Be half-life of 1.36 ± 0.07 x10 yrˉ¹ (Nishiizumi et al., 2007, doi:10.1016/j.nimb.2007.01.297). 10Bem was calculated from the normalized and blank-corrected 10Be/9Be ratios. The reported 1σ uncertainties include counting statistics and the uncertainties of both standard normalization and blank correction. Stable 9Be concentrations were measured on a separate aliquot of the sample solution using inductively coupled plasma optical emission spectroscopy (ICP-OES). Uncertainty of ICP-OES measurements was 5%. We used coarse quartz grain OSL analysis to determine depositional ages for each floodplain core. For OSL analysis, we collected light-sealed samples by driving an opaque tube into our floodplain cores at two select depths in each core. OSL measurements were performed using a Risø DA 15 OSL/TL reader equipped with a 90Sr beta irradiator (4.9 Gy/min). OSL signals were stimulated with blue LEDs (470 nm, 50 s, 125 ºC) and detected through an optical filter (U 340 Hoya). For each sample, 40 aliquots were measured using the single-aliquot regenerative dose (SAR) protocol (Murray and Wintle, 2000, doi:10.1016/S1350-4487(03)00053-2) for equivalent dose determination.
DOI: 10.1594/pangaea.883189
title: U-Pb ages of apatite detritus from the river Tarn, Massif Central, France
DOI: 10.1594/pangaea.835164
title: (Table 1) Helium isotope ratios of sediment core TT013_114

description: We present a helium isotope record for core TT013-114PC from the central equatorial Pacific (140°W, 4°N, 4432 m water depth) spanning a period of 1 million years. We focus on the time interval from 560 to 800 kyr, largely coinciding with the mid-Pleistocene climate transition (MPT) when the dominant period of the Earth's climate variability shifted from 41 kyr to 100 kyr. The terrigenous 4He concentrations from our study correlate very well with published titanium concentrations in this core strongly supporting the use of terrigenous 4He as a monitor of continental dust. Normalizing titanium and terrigenous 4He concentrations to 3He suggests that the dust supply during the MPT was approximately 30% lower compared to the subsequent period (560-100 kyr). The 3He-normalized barium, aluminum and phosphorus concentrations, trace elements with a predominantly biogenic source in these sediments, are relatively constant. This is in contrast to previous studies that reported an apparent rise of titanium-normalized productivity proxies. Rather than a significant increase in productivity during the MPT, we conclude that the dust flux to the central equatorial Pacific was reduced and that the export productivity was approximately constant during this period of climate reorganization.
description: Supplement to: Winckler, Gisela; Anderson, Robert F; Schlosser, Peter (2005): Equatorial Pacific productivity and dust flux during the mid-Pleistocene climate transition. Paleoceanography, 20(4), PA4025
DOI: 10.1594/pangaea.707810
title: (Table 2) Element concentrations of Re, Os, and isotopic composition of Os from ROPOS samples in the Saanich Inlet

description: Samples were taken from the surface sediment - water interface. Position is an estimation
DOI: 10.1594/pangaea.713248
title: (Table 1) Os isotope ratios of sediments from the Massignano Section
DOI: 10.1594/pangaea.857523
title: (Supplement EA5) Hafnium and Neodymium isotope ratios of piston core sediments from the Cocos plate

description: Isotope ratio normalizations are outlined in Table (Supplement EA1).
DOI: 10.1594/pangaea.890929
title: Uranium, thorium and protactinium activity concentrations and isotopic ratios and opal content in JC094-GVY01 sediment core
DOI: 10.1594/pangaea.890930
title: Uranium, thorium and protactinium activity concentrations and isotopic ratios and opal content in JC094-GVY14 sediment core
DOI: 10.1594/pangaea.720985
title: (Table 3) Noble gas concentrations of oceanic sediments
DOI: 10.1594/pangaea.711302
title: (Table 3) Concentrations and isotopic ratios of thorium and uranium in sediments at Site AII42-42PG
DOI: 10.1594/pangaea.711145
title: (Table 1) Os isotope ratios and Pt, Ir and Os concentrations in sediments from ODP Hole 145-886C
DOI: 10.1594/pangaea.711305
title: (Table 3) Concentrations and isotopic ratios of thorium and uranium in sediments at Site GGC37-VG19
DOI: 10.1594/pangaea.815336
title: (Table 5) Bulk sediment 187Os/188Os ratios from ODP Site 165-1002C
DOI: 10.1594/pangaea.711272
title: (Table 2) Re,Os and Pt concentrations and isotopic ratios for ODP Site 153-920 abyssal peridotites
DOI: 10.1594/pangaea.720978
title: (Table 2) Noble gas concentrations of old oceanic crust
DOI: 10.1594/pangaea.909640
title: Table 4 - MCICPMS Pb isotope compositions total marginal sediment dissolutions

description: Pb isotope results from total dissolution of bulk sediment samples from the Sorbas Basin. Uncertainties in the table are internal measurement uncertainties and reported in 2 SE format.
description: All data from analytical session 5: November 2015, Neptune Plus MCICPMS.
DOI: 10.1594/pangaea.722621
title: (Appendix) Afro-Arabian flood volcanism Pb isotope ratios

description: In situ measurement. Position of Ethiopia samples are from Ukstins et al. (2002, doi:10.1016/S0012-821X(02)00525-3) and estimated from map. Position of Yemen samples is a mean estimate of map
DOI: 10.1594/pangaea.909083
title: Authigenic Pb isotope composition of ODP Site 177-1094
DOI: 10.1594/pangaea.909638
title: Table 2 - MCICPMS Pb isotope compositions bulk marginal sediment leachates

description: Pb isotope results of acid-reductive leaching of bulk sediments from the Sorbas and Caltanissetta Basins and the Apennine Foredeep. Uncertainties in the table are internal measurement uncertainties reported to 2 SE. Some samples were repeated; if RPT# is noted, this is a repeated measurement of the same solution. Otherwise, the repeat measurement was performed with a separate leaching of a new portion of sediment. An average value of these measurements is provided where relevant. The analytical session in which the measurement was performed is explained in the table footnote.
description: Numbers in 'Analysis run' indicate the time when the measuring sessions took place: 1 - August 2013; 2 - February 2014; 3 - November 2014; 4 - September 2015
DOI: 10.1594/pangaea.815163
title: (Table 2) Sr–Nd–Pb–Hf–O isotopic compositions for Central American Arc volcanites

description: Pb and Nd isotope data for NW nicaragua volcanic front samples are from Hoernle et al. (2008)
DOI: 10.1594/pangaea.707886
title: (Table 1) Os concentrations and 187Os/188Os ratios of bulk sediment from ODP Hole 199-1218A

description: Sediment depth (m) is revised meters composite depth (rmcd)
DOI: 10.1594/pangaea.786024
title: (Table 1) Helium isotope ratio of ODP Site 198-1209 sediments

description: We attempt to constrain the variability of the flux of extraterrestrial 3He in the Paleocene by studying sediments from Shatsky Rise (Ocean Drilling Program, ODP Leg 198) that have tight orbital age control. 3He concentrations in Shatsky Rise sediments vary periodically at high frequency by about a factor of 6 over the 800-ka record analyzed. Virtually all of the sedimentary 3He (&gt; 99.98%) is of extraterrestrial origin. The total helium in the sediments can be explained as a binary mixture of terrestrial and extraterrestrial components. We calculate an average 3He/4He ratio for the extraterrestrial endmember of 2.41 ± 0.29 * 10**-4, which is, remarkably, equal to that measured in present-day interplanetary dust particles. We determine a constant extraterrestrial 3He flux of 5.9 ± 0.9 * 10**-13 cm**3STP/cm**2/ ka for our 800-ka Paleocene record at ~ 58 Ma. This value is identical within error to those for the late Paleocene in sediments from the northern Pacific and the Weddell Sea. Bulk sediment MARs (derived using a constant extraterrestrial 3He flux) respond to climate-forced carbonate preservation cycles and changes in eolian flux over the late Paleocene. This is the first direct evidence for significant changes in dust accumulation in response to eccentricity forcing during a greenhouse climate interval.
description: Sediment depth is given in rcmd.
description: Supplement to: Marcantonio, Franco; Thomas, Deborah J; Woodard, Stella C; McGee, David; Winckler, Gisela (2009): Extraterrestrial 3He in Paleocene sediments from Shatsky Rise: Constraints on sedimentation rate variability. Earth and Planetary Science Letters, 287(1-2), 24-30
DOI: 10.1594/pangaea.862568
title: (Table 1, page 641) Hf isotope time series for the uppermost part of a ferromanganese crust from the San Pablo ferro-manganese pavement

description: The Hf isotope composition of seawater does not match that expected from dissolution of bulk continental crust. This mismatch is generally considered to be due to retention of unradiogenic Hf in resistant zircons during incomplete weathering of continental crust. During periods of intense glacial weathering, zircons should break down more efficiently, resulting in the release of highly unradiogenic Hf to the oceans. We test this hypothesis by comparing Nd and Hf isotope time series obtained from NW Atlantic ferromanganese crusts. Both isotope systems show a decrease associated with the onset of northern hemisphere glaciation. The observed changes display distinct trajectories in epsilon Nd- epsilon Hf space, which differ from previously reported arrays of bulk terrestrial material and seawater. Such patterns are consistent with the release of highly unradiogenic Hf from very old zircons, facilitated by enhanced mechanical weathering.
description: Repeated analyses of the JMC475 Hf standard gave an average ratio 176Hf/177Hf of 0.282139±18 (n=56). All ratios were normalised to their reported JMC475 value of 0.282161±9. Epsilon-Hafnium is calculated with 176Hf/177HfChur = 0.282772.From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis..) not present in the NOAA-MMS database.
description: Supplement to: van de Flierdt, Tina; Frank, Martin; Lee, Der-Chuen; Halliday, Alex N (2002): Glacial weathering and the hafnium isotope composition of seawater. Earth and Planetary Science Letters, 201(3-4), 639-647
DOI: 10.1594/pangaea.785724
title: (Table S1) Marine Os isotope record across the Cretaceous-Tertiary boundary

description: Continental flood basalt (CFB) volcanism is hypothesized to have played a causative role in global climate change and mass extinctions. Uncertainties associated with radiometric dating preclude a clear chronological assessment of the environmental consequences of CFB volcanism. Our results document a 25% decline in the marine 187Os/188Os record that predates the Cretaceous-Tertiary boundary (KTB) and coincides with late Maastrichtian warming. We argue that this decline provides a chemostratigraphic marker of Deccan volcanism and thus constitutes compelling evidence that the main environmental consequence of Deccan volcanism was a transient global warming event of 3° to 5°C that is fully resolved from the KTB mass extinction.
description: Sediment depth is given in mbsf. For Atlantic and Pacific sites age models are based on linear interpolation between magnetic reversal boundaries and the KTB. For the Indian Ocean the age model is based solely on biostratigraphy and is less well constrained.
description: Supplement to: Ravizza, Gregory E; Peucker-Ehrenbrink, Bernhard (2003): Chemostratigraphic Evidence of Deccan Volcanism from the Marine Osmium Isotope Record. Science, 302(5629), 1392-1395
DOI: 10.1594/pangaea.711182
title: (Table 1) Os and Sr isotopes in low-temperature hydrothermal fluids from the Juan de Fuca Ridge at ODP Site 168-1026B

description: We present Os and Sr isotopes and Mg, Os, and Sr concentrations for ridge-crest high-temperature and diffuse hydrothermal fluids, plume fluids and ridge-flank warm spring fluids from the Juan de Fuca Ridge. The data are used to evaluate the extent to which (1) the high- and low-temperature hydrothermal alteration of mid-ocean ridge basalts (MORBs) provides Os to the deep oceans, and (2) hydrothermal contributions of non-radiogenic Os and Sr to the oceans are coupled. The Os and Sr isotopic ratios of the high-temperature fluids (265-353°C) are dominated by basalts (187Os/188Os = 0.2; 87Sr/86Sr = 0.704) but the concentrations of these elements are buffered approximately at their seawater values. The 187Os/188Os of the hydrothermal plume fluids collected ~1 m above the orifice of Hulk vent is close to the seawater value (=1.05). The low-temperature diffuse fluids (10-40°C) associated with ridge-crest high-temperature hydrothermal systems on average have [Os] = 31 fmol/kg, 187Os/188Os = 0.9 and [Sr] = 86 µmol/kg, 87Sr/86Sr = 0.709. They appear to result from mixing of a high-temperature fluid and a seawater component. The ridge-flank warm spring fluids (10-62°C) on average yield [Os] = 22 fmol/kg, 187Os/188Os = 0.8 and [Sr] = 115 µmol/kg, 87Sr/86Sr = 0.708. The data are consistent with isotopic exchange of Os and Sr between basalt and circulating seawater during low-temperature hydrothermal alteration. The average Sr concentration in these fluids appears to be similar to seawater and consistent with previous studies. In comparison, the average Os concentration is less than seawater by more than a factor of two. If these data are representative they indicate that low-temperature alteration of MORB does not provide adequate non-radiogenic Os and that another source of mantle Os to the oceans must be investigated. At present, the magnitude of non-radiogenic Sr contribution via low-temperature seawater alteration is not well constrained. If non-radiogenic Sr to the oceans is predominantly from the alteration of MORB, our data suggest that there must be a different source of non-radiogenic Os and that the Os and Sr isotope systems in the oceans are decoupled.
DOI: 10.1594/pangaea.824896
title: (Table S1) Re-Os concentrations across the Cretaceous-Paleogene boundary

description: An impact-induced osmium (Os) isotope excursion provides a unique means of assessing the completeness of marine Cretaceous-Paleogene (K-Pg) boundary sections, and surmounting challenges associated with constraining the time scale of the Earth system recovery from this extreme perturbation. A model of the recovery of seawater187Os/188Os following the impact event allows independent estimates of the time elapsed since the impact, which can be directly compared to time estimates derived from biostratigraphy, magnetostratigraphy and cyclostratigraphy. This approach is tested using data from three deep ocean sites cored by the Ocean Drilling Program (ODP). Data from ODP 1262B (South Atlantic) and ODP 690C (Southern Ocean) display the expected 187Os/188Os minimum very close to the biostratigraphically defined K-Pg boundary and yield Os-based accumulation rate estimates similar to those obtained from magnetostratigraphy and orbital tuning. In contrast, the187Os/188Os minimum in ODP 1209C (Western Pacific) occurs ≈9 cm below the K-Pg boundary. Low Os concentrations throughout the boundary interval and an implausibly rapid recovery to higher, pre-impact187Os/188Os ratios provide strong evidence for a previously unrecognized gap in the K-Pg interval of Site 1209. Results presented here provide strong empirical evidence that Os isotope data are uniquely valuable in assessing the completeness and accumulation rates of earliest Paleogene sediments from the deep sea. They are of broad interest because they have implications for astronomical tuning of the geologic time scale and illustrate that whole ocean geochemical perturbations can provide an alternative to biostratigraphy for correlation and timekeeping during abrupt biotic events.
description: Supplement to: Ravizza, Gregory E; VonderHaar, Denys (2012): A geochemical clock in earliest Paleogene pelagic carbonates based on the impact-induced Os isotope excursion at the Cretaceous-Paleogene boundary. Paleoceanography, 27(3), PA3219
DOI: 10.1594/pangaea.705290
title: (Table 2) Hf-Nd composition of DSDP site 18-174 sediments

description: Reported ratios are mass bias corrected and normalized based on 176Hf/177Hf=0.282160 for JMC 475 and 143Nd/144Nd=0.511860 LaJolla. Uncertainties for 176Lu/177Hf are 0.2%, for 147Sm/144Nd are 0.4%, and for concentrations of Lu, Hf, Sm, and Nd are &lt;1%, based on isotopic reproducibility of USGS standard BCR-2. For calculation of epsilon values 143Nd/144Nd_CHUR(0)=0.512638 and 147Sm/144Nd_CHUR(0)=0.1966 were used. For calculation of epsilon Hf values 176Hf/177Hf_CHUR(0)=0.282772 and 176Lu/177Hf_CHUR(0)=0.0332 were used. For calculation of depleted mantle model ages 143Nd/144Nd_CHUR(0)=0.513150 and 147Sm/144Nd_CHUR(0)=0.2137 were used. Decay constant values used were: lambda_176Lu=1.867x10**-11 and lambda_147Sm=6.54x10**-12.
DOI: 10.1594/pangaea.909639
title: Table 3 - MCICPMS Pb isotope compositions strong marginal sediment leachates

description: Pb isotope results of strong leachates performed on bulk sediments from the Sorbas Basin. Uncertainties in the table are internal measurement uncertainties, reported in 2SE format.
description: All data from analytical session 4 on September 2015 performed on Neptune Plus MCICPMS.
DOI: 10.1594/pangaea.782934
title: (Table 1) Hf-Nd isotope ratios of marine sediments of the world's major subduction zones
DOI: 10.1594/pangaea.126286
title: Uranium, protactinium and thorium radionuclide activities in surface sediments of the continental slope of the Argentine basin

description: This is a set of bulk sediment analyses of 230Th, 232Th, 231Pa as well as uranium isotopes in surface sediments from the continental slope of the Argentine basin. Samples were subject to full digestion, and radioisotope data were determined using isotope dilution after ion chromatographic separation, electroplating and counting via alphaspectrometry (233Pa yield tracer: beta-counting) by Steffen Niemann as part of his diploma thesis in 2003 (supervision FU Berlin- Prof. Heubeck/ AWI Bremerhaven-Dr. Walter Geibert and Prof. Michael Schlüter).