cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.860806
title: U-Pb age analyses on zircon grains from Mount Lawson Formation bentonites (Ellesmere Island)

description: LA-ICP-MS analyses on zircon grains from Mount Lawson Formation bentonites (Ellesmere Island). Analyses listed from lowest to highest 206Pb/238U age for &lt;1000 Ma and lowest to highest 207Pb/206Pb age for &gt;1000 Ma. Spot nomenclature follows the scheme x-y.z: with x=sample number, y=grain, z=spot. Disc.: per cent discordance for the given 207Pb/206Pb age. Error correl.: Error correlation coefficient for concordia coordinates. Concordia coordinates: y = 206Pb/238U = EXP(L238*(206-238 Age)) - 1; x = 207Pb/235U = EXP(L235 × (207-235 Age)) - 1; 207Pb/206Pb = 137.88 × x/y; Uranium decay constants (L238 & L235) are from (Jaffey et al., 1971). L238 = 1.55125 × 10-4/Ma; L235 = 9.8485 × 10-4/Ma. Reference: Jaffey, A., K. Flynn, L. Glendenin, W. Bentley, and A. Essling (1971), Precision Measurement of Half-Lives and Specific Activities of 235U and 238U, Phys. Rev. C, 4(5), 1889-1906.
DOI: 10.1594/pangaea.912101
title: Table S3. Past Himalayan erosion from Bengal Fan: 10Be blanks

description: Five analytical blanks were prepared synchronously with the samples of Tables S1-S2 (https://doi.org/10.1594/PANGAEA.912098 and https://doi.org/10.1594/PANGAEA.912100). The average 10Be/9Be blank of 5.26x10-15 was used to correct the concentrations of Table S1 and Table S2.
DOI: 10.1594/pangaea.57913
title: (Figure 3c) 230Th, 231Pa and 231Pa/230Th activity ratios of sediment core PS1509-2
DOI: 10.1594/pangaea.857521
title: (Supplement EA1) Elements, Neodymium and Hafnium analysis on lavas from Nevado de Toluca

description: Major elements were determined by X-ray fluorescence spectroscopy (XRF) using a Siemens SRS-3000 instrument in the Laboratorio Universitario de Geoquímica Isotópica (LUGIS), UNAM, using procedures of Lozano and Bernal (2005). Trace element concentrations were determined using Thermo Scientific Electron X-series ICP-MS (Inductively Coupled Plasma Mass Spectrometer) at the Centro de Geociencias (CGEO), UNAM-Querétaro, following sample preparation and measurement procedures described by Mori et al., (2007; doi:10.1016/j.chemgeo.2007.07.002). Nd isotopes were measured at LDEO using VG-Sector 54 TIMS. Purified Nd was loaded on Re filaments and Nd isotopes were measured by dynamic multicollection as NdO+. 143Nd/144Nd ratios are normalized to 146Nd/144Nd = 0.7219. Unknowns are normalized to La Jolla value of 143Nd/144Nd = 0.511860 ± 19 (2 sigma external SD during the entire study period, n = 177). International standard JNdi-1 yielded 143Nd/144Nd = 0.512110 ± 19 (n = 5), which is comparable to the published value of 0.512117 ± 7 (Tanaka et al., 2000, doi:10.1016/S0009-2541(00)00198-4). Hf isotope ratios were measured at LDEO using multi-collector ICPMS. 176Hf/177Hf are normalized to 179Hf/177Hf = 0.7325. Instrumental drift was monitored by repeated measurements of a Johnson-Matthey Hf elemental standard with the same 176Hf/177Hf ratio as the JMC-475 standard. Unknowns are normalized to the JMC-475 value of 176Hf/177Hf = 0.282160 (Vervoort and Blichert-Toft, 1999; doi:10.1016/S0009-2541(00)00198-4). 2 sigma external SD during measurement sessions are below 0.000012 (n = 10). The average measured 176Hf/177Hf values for BHVO-1 is 0.283107 ± 20 (n = 14) and for BCR-1 is 0.282876 ± 13 (n = 5), which agree with the recommended values from Weis et al. (2007, doi:10.1029/2006GC001473), which reported BHVO-1 of 0.283106 ± 12 (n = 7); BCR-1 of 0.282875 ± 8 (n = 5).
DOI: 10.1594/pangaea.900836
title: Properties and analytical data for samples from the Adirondacks, New York, US, analyzed for cosmogenic Chlorine-36
DOI: 10.1594/pangaea.783690
title: (Table 1) U-Pb isotope dating of zircons from granite of the Piri Rise
DOI: 10.1594/pangaea.711525
title: (Table 1) Os concentrations and 187Os/186Os, 187Os/188Os ratios for DSDP Hole 92-597 metalliferous sediments

description: Further 187OS/186OS data and Os concentrations of bulk sediment see Ravizza (1993) dataset: doi:10.1594/PANGAEA.711521
DOI: 10.1594/pangaea.712128
title: (Table 2) 40Ar/39Ar ratios of whole rock samples from DSDP Hole 89-462A

description: best age estimate is 110.8 +/- 1.0 Ma
DOI: 10.1594/pangaea.725469
title: Isotope ratios and trace element concentrations of basalts from DSDP Leg 15 sites (Appendix 1)

description: Formation of the Cretaceous Caribbean plateau, including the komatiites of Gorgona, has been linked to the currently active Galápagos hotspot. We use Hf-Nd isotopes and trace element data to characterise both the Caribbean plateau and the Galápagos hotspot, and to investigate the relationship between them. Four geochemical components are identified in the Galápagos mantle plume: two 'enriched' components with epsilon-Hf and epsilon-Nd similar to enriched components observed in other mantle plumes, one moderately enriched component with high Nb/Y, and a fourth component which most likely represents depleted MORB source mantle. The Caribbean plateau basalt data form a linear array in Hf-Nd isotope space, consistent with mixing between two mantle components. Combined Hf-Nd-Pb-Sr-He isotope and trace element data from this study and the literature suggest that the more enriched Caribbean end member corresponds to one or both of the enriched components identified on Galápagos. Likewise, the depleted end member of the array is geochemically indistinguishable from MORB and corresponds to the depleted component of the Galápagos system. Enriched basalts from Gorgona partially overlap with the Caribbean plateau array in epsilon-Hf vs. epsilon-Nd, whereas depleted basalts, picrites and komatiites from Gorgona have a high epsilon-Hf for a given epsilon-Nd, defining a high-epsilon-Hf depleted end member that is not observed elsewhere within the Caribbean plateau sequences. This component is similar, however, in terms of Hf-Nd-Pb-He isotopes and trace elements to the depleted plume component recognised in basalts from Iceland and along the Reykjanes Ridge. We suggest that the Caribbean plateau represents the initial outpourings of the ancestral Galápagos plume. Absence of a moderately enriched, high Nb/Y component in the older Caribbean plateau (but found today on the island of Floreana) is either due to changing source compositions of the plume over its 90 Ma history, or is an artifact of limited sampling. The high-epsilon-Hf depleted component sampled by the Gorgona komatiites and depleted basalts is unique to Gorgona and is not found in the Caribbean plateau. This may be an indication of the scale of heterogeneity of the Caribbean plateau system; alternatively Gorgona may represent a separate oceanic plateau derived from a completely different Pacific plume, such as the Sala y Gomez.
description: Supplement to: Thompson, Patricia M E; Kempton, Pamela D; White, Rosalind V; Kerr, Andrew C; Tarney, J; Saunders, Andrew D; Fitton, J Godfrey; McBirney, A (2003): Hf-Nd isotope constraints on the origin of the Cretaceous Caribbean plateau and its relationship to the Galápagos plume. Earth and Planetary Science Letters, 217(1-2), 59-75
DOI: 10.1594/pangaea.900630
title: Radiosonde measurements from Neumayer Station (2018-04)

description: The meteorological observatory Neumayer typically launches one radiosonde per day around 12UTC. At least weekly the sonde has an ozone sensor attached. Sondes are released from the roof of the station building. The measurement interval of the raw data is typically 1s. Data is quality controlled: Erroneous data is removed (technical issues). Partial pressure ozone is manually validated for plausibility.
description: Station altitude is 43 m, the launch site is located 25 m higher at 68 m above sea level. The first row of each sounding holds surface data for TTT, RH, ff and dd, which is not acquired by the radiosonde. The measuring height of TTT and RH is 2m, and 10m for dd and ff. The first pressure value of each profile is derived from surface pressure measurements, reduced to the indicated altitude. Soundings were performed using a different method (Radiosonde, Vaisala, RS41-SGP) on 2018-04-10T18:00.
DOI: 10.1594/pangaea.846689
title: (Table 1) Helium and Thorium 230 excess concentrations in sediment cores B18 and B25

description: At four sites in the central equatorial Pacific Ocean the flux of extraterrestrial 3He, determined using the excess 230Th profiling method, is 8 * 10**-13 cm**3 STP/cm**2/ka. This supply rate is constant to within 30%. At these same sites, however, the burial rate of 3He, determined using chronostratigraphic accumulation rates, varies by more than a factor of 3. The lowest burial rates, which occur north of the equator at 1°N, 139°W are lower than the global average rate of supply of extraterrestrial 3He by 20% and indicate that sediment winnowing may have occurred. The highest burial rates, which are recorded at the equator and at 2°S, are higher than the rate of supply of extraterrestrial 3He by 100%, and these provide evidence for sediment focusing. By analyzing several proxies measured in core PC72 sediments spanning the past 450 kyr we demonstrate that periods of maximum burial rates of 230Th, 3He, 10Be, Ti, and barite, with a maximum peak-to-trough amplitude of a factor of 6, take place systematically during glacial time. However, the ratio of any one proxy to another is constant to within 30% over the entire length of the records. Given that each proxy represents a different source (234U decay in seawater, interplanetary dust, upper atmosphere, continental dust, or upper ocean), our preferred interpretation for the covariation is that the climate-related changes in burial rates are driven by changes in sediment focusing.
description: Supplement to: Marcantonio, Franco; Anderson, Robert F; Higgins, Sean M; Stute, Martin; Schlosser, Peter; Kubik, Peter W (2001): Sediment focusing in the central equatorial Pacific Ocean. Paleoceanography, 16(3), 260-267
DOI: 10.1594/pangaea.727041
title: (Table 2) Analytical data for ferromanganese nodules from ODP Hole 181-1121B
DOI: 10.1594/pangaea.710926
title: (Table 2) Beryllium-10 and Aluminium-26 concentrations in marine opal from sediments of ODP Hole 177-1093
DOI: 10.1594/pangaea.723908
title: (Appendix 1) Helium isotopic ratios and sedimentation rate model of ODP Hole 171-1051B
DOI: 10.1594/pangaea.783693
title: (Table 2) U-Pb isotope dating of zircons from rhyolite porphyrite of the Piri Rise
DOI: 10.1594/pangaea.715020
title: (Table 2) Pb isotopic composition of eolian dust from sediment core LL44 GPC3

description: AGE = chronostratigraphic age based on the age model of constant flux of hydrogenous Co (Kyte et al., 1993 doi:10.1016/0016-7037(93)90109-A)
DOI: 10.1594/pangaea.704736
title: (Table 8) U-Pb zircon results of granitic dyke G8-60.1 from Archer Point, northern Oates Land

description: Calibration error of reference zircon: 1.20% (n=18)
DOI: 10.1594/pangaea.751393
title: (Table 4) Sr, Nd, and Ce isotope composition in ODP Hole 111-504B basalts
DOI: 10.1594/pangaea.723619
title: (Table 2b) Isotopic composition of Xe of pillow lava from CYAMEX samples
DOI: 10.1594/pangaea.704737
title: (Table 6.2) U-Pb zircon results of diatexite G8-63.1 from De Remer Nunataks, northern Oates Land

description: Calibration error of reference zircon: 1.68% (n=18)
DOI: 10.1594/pangaea.717743
title: (Table 2) Pb isotope composition of K-feldspars from sediments of the Bengal Fan
DOI: 10.1594/pangaea.847013
title: (Table 8) SHRIMP U-Pb zircon data for sample ABA/69 from Gjelsvikfjella, Dronning Maud Land
DOI: 10.1594/pangaea.847007
title: (Table 4) SHRIMP U-Pb zircon data for sample ABA/10B from Gjelsvikfjella, Dronning Maud Land
DOI: 10.1594/pangaea.706538
title: (Table 3) Isotopic composition of rocks from ODP Hole 135-836A
DOI: 10.1594/pangaea.847010
title: (Table 6) SHRIMP U-Pb zircon data for sample ABA/32 from Gjelsvikfjella, Dronning Maud Land
DOI: 10.1594/pangaea.778786
title: (Table T2) Beryllium and neodymium composition of ODP Leg 194 sites and survey sites crusts
DOI: 10.1594/pangaea.687750
title: Crust growth and isotope age, Australian Southern Ocean
DOI: 10.1594/pangaea.706542
title: (Table 3) Isotopic composition of rocks from ODP Hole 135-839B
DOI: 10.1594/pangaea.70758
title: Crust growth and isotope age, Cape Basin
DOI: 10.1594/pangaea.786065
title: (Table 1) Sr and Hf isotope ratios of DSDP Site 78-543 and 14-144 sediments
DOI: 10.1594/pangaea.706544
title: (Table 3) Isotopic composition of rocks from DSDP Hole 21-204
DOI: 10.1594/pangaea.70762
title: Crust growth and isotope age, Mid Atlantic Ridge
DOI: 10.1594/pangaea.715013
title: (Table 1) Lu-Hf isotope ratios of eolian dust from sediment core LL44-GPC-3

description: AGE after Kyte et al. (1993 doi:10.1016/0016-7037(93)90109-A). Sample preparation: without surface cleaning and without bomb fraction. For epsilon-Nd data see Pettke et al. (2002) data set: doi:10.1594/PANGAEA.715019
DOI: 10.1594/pangaea.786519
title: (Table 3) Osmium isotope ratios for Fe-Mn oxyhydroxide leachate, mixed foraminifera, and Globorotalia menardii from ODP Hole 121-758A

description: Sediment depth is given in mcd.
DOI: 10.1594/pangaea.711374
title: Sm-Nd isotope and Mn/Ca ratios for cleaned Neogloboquadrina pachyderma from ODP Hole 105-647A (Table 1)

description: The neodymium (Nd) isotope composition of ancient seawater is a potentially useful tracer of changes in continental inputs and ocean circulation on timescales of a few ka. Here we present the first Nd isotope record for seawater using sedimentary foraminifera cleaned using standard oxidative-reductive techniques. The data, along with Mn/Ca ratios, suggest that cleaned foraminifera provide a reliable record of Nd in seawater and hold out the prospect of using Nd in foraminifera to examine changes in seawater that accompany glacial-interglacial climatic cycles. The principal potential problem to be overcome with the use of forams as records of trace elements in ancient seawater is their diagenetic Fe-Mn coatings. These contain large amounts of Nd and other trace elements but can be cleaned off using highly reducing reagents. Mn(Ca ratios for the majority of the cleaned sedimentary foraminifera analysed here lie within the range (10-100 µmol/mol) that has yielded success in studies of transition elements in forams. Mass-balance modelling suggests that for residual Mn/Ca ratios &lt;100 µmol/mol, Nd added to the foram in the coating will never shift the measured Nd isotope composition significantly away from the seawater value acquired by the foram test in the water column. Additionally, Nd concentrations measured in cleaned sedimentary foraminifera are comparable with those for a modern sample that has never encountered diagenetic fluids. Finally, core-top planktonic foraminifera for two sites have Nd isotope compositions that are identical to local surface seawater. The data we present here for Labrador Sea forams over the past 2.5 m.y. are interpreted in terms of changes in the seawater isotopic composition. The data show a pronounced shift from epsilon-Nd values of ~-12 to ~-19 in the period 2.5-1.5 Ma. This change is interpreted to result from the initiation of Northern Hemisphere glaciation and the increased derivation of Labrador Sea Nd via ice-rafting from Archaean terranes in central Canada. In combination with stable isotope and foraminiferal relative species abundance data, the new Nd data are consistent with the surface hydrography of the Labrador Sea being dominated by a fluctuating balance between cold, polar waters containing unradiogenic Nd and warm, subtropical waters containing more radiogenic Nd. The major change in Labrador Sea Nd that is observed in the past 2.5 Ma can, on its own, account for the change in the Nd isotope composition of North Atlantic Deep Water over the same time period.
description: N. pachyderma left and right coiling, &gt;63 µm
description: Supplement to: Vance, Derek; Burton, Kevin W (1999): Neodymium isotopes in planktonic foraminifera: a record of the response of continental weathering and ocean circulation rates to climate change. Earth and Planetary Science Letters, 173(4), 365-379
DOI: 10.1594/pangaea.845998
title: U, Th and He isotope content, and accumulation rates of sediment core SO202-07-6
DOI: 10.1594/pangaea.905850
title: Radiogenic isotopic record of Pliocene Speleothems from Coves d'Artá, Mallorca

description: These final results assume an initial δ234U of 750 ‰.
DOI: 10.1594/pangaea.883188
title: U-Pb ages of rutile detritus from the river Tarn, Massif Central, France
DOI: 10.1594/pangaea.746051
title: (Table 3) Concentrations and isotopic composition of helium from fluid inclusions in rocks and minerals from the Markov Deep, MAR rift valley
DOI: 10.1594/pangaea.886233
title: Heavy mineral analysis and detrital U-Pb ages of detrital apatite
DOI: 10.1594/pangaea.886235
title: Heavy mineral analysis and detrital U-Pb ages of detrital zircon
DOI: 10.1594/pangaea.886234
title: Heavy mineral analysis and detrital U-Pb ages of detrital rutile
DOI: 10.1594/pangaea.707890
title: (Table 2) Os concentrations and 187Os/188Os ratios of leached sediment from DSDP Hole 73-522
DOI: 10.1594/pangaea.713247
title: (Table 1) Os isotope ratios of sediments from DSDP Hole 85-574C
DOI: 10.1594/pangaea.785718
title: (Table S5) Os isotope and platinum group element content in ODP Hole 113-690C
DOI: 10.1594/pangaea.713246
title: (Table 1) Os isotope ratios of sediments from DSDP Hole 73-522
DOI: 10.1594/pangaea.785719
title: (Table S6) Os isotope and platinum group element content in the Bottaccione Section, Gubbio
DOI: 10.1594/pangaea.763970
title: Polonium-210 and Lead-210 activities measured on 9 water bottle profiles during POLARSTERN cruise ANT-XXIV/3

description: As part of the GEOTRACES Polarstern expedition ANT XXIV/3 (ZERO and DRAKE), Polonium-210 and Lead-210 have been measured in the water column and on suspended particulate matter in February to April 2008. Our goal was to resolve the affinities of 210Po and 210Pb to transparent exopolymer particles (TEP) and particulate organic carbon (POC).Polonium-210 and Lead-210 in the ocean can be used to identify the sources and sinks of suspended matter. In seawater, Polonium-210 (210Po) and Lead-210 (210Pb) are produced by stepwise radioactive decay of Uranium-238. 210Po (138 days half life) and 210Pb (22.3 years half life) have high affinities for suspended particles. Those radionuclides are present in dissolved form and adsorbed onto particles. Following adsorption onto particle surfaces, 210Po especially is transported into the interior of cells where it bonds to proteins. In this way, 210Po also accumulates in the food chain. 210Po is therefore considered to be a good tracer for POC, and traces particle export over a timescale of months. 210Pb (22.3 years half life) adsorbs preferably onto structural components of cells, biogenic silica and lithogenic particles, and is therefore a better tracer more rapidly sinking matter. Water samples were taken with Niskin bottles. Dissolved Polonium-210 and Lead-210 activities refer to the fraction &lt; 1µm. Particulate Polonium-210 and Lead-210 refer to the activity on particles &gt;1µm retained on nucleopore filters. Zooplankton retained on the filters was systematically removed as this study focused on phytoplankton and exudates. The data have been submitted to Pangaea following a Polonium-Lead intercalibration exercise organized by GEOTRACES, where the AWI lab results range within the data standard deviation from 10 participating labs.
DOI: 10.1594/pangaea.89432
title: Export production by 234Th, including 210Po and 210Pb measured on water bottle samples during POLARSTERN cruise ANT-X/6
DOI: 10.1594/pangaea.120582
title: Results of 207Pb/206Pb single zirkon dating of granite porphyry dikes and a rhyolithe in the north-western Thuringian Forest
DOI: 10.1594/pangaea.744945
title: (Table 1) Isotopic and geochemical parameters of gas phase from underground fluids of the Baikal rift and its framing

description: Results of studying isotopic composition of helium in underground fluids of the Baikal-Mongolian region during the last quarter of XX century are summarized. Determinations of 3He/4He ratio in 139 samples of gas phase from fluids, collected at 104 points of the Baikal rift zone and adjacent structures are given. 3He/4He values lie within the range from 1x10**-8 (typical for crustal radiogenic helium) to 1.1x10**-5 (close to typical MORB reservoir). Repeated sampling in some points during more than 20 years showed stability of helium isotopic composition in time in each of them at any level of 3He/4He values. There is no systematic differences of 3He/4He in samples from surface water sources and deeper intervals of boreholes in the same areas. Universal relationship between isotopic composition of helium and general composition of gas phase is absent either, but the minimum 3He/4He values occurred in methane gas of hydrocarbon deposits, whereas in nitrogen and carbon dioxide gases of helium composition varied (in the latter maximum 3He/4He values have been measured). According to N2/Ar_atm ratio nitrogen gases are atmospheric. In carbonic gas fN2/fNe ratio indicates presence of excessive (non-atmogenic) nitrogen, but the attitude CO2/3He differs from one in MORB. Comparison of helium isotopic composition with its concentration and composition of the main components of gas phase from fluids shows that it is formed under influence of fractionation of components with different solubility in the gas-water system and generation/consumption of reactive gases in the crust. Structural and tectonic elements of the region differ from the spectrum of 3He/4He values. At the pre-Riphean Siberian Platform the mean 3He/4He = (3.6+/-0.9)x10**- 8 is very close to radiogenic one. In the Paleozoic crust of Khangay 3He/4He = (16.3+/-4.6)x10**-8, and the most probable estimate is (12.3+/-2.9)x10**-8. In structures of the eastern flank of the Baikal rift zone (Khentei, Dauria) affected by the Mz-Kz activization 3He/4He values range from 4.4x10**-8 to 2.14x10**-6 (average 0.94x10**-6). Distribution of 3He/4He values across the strike of the Baikal rift zone indicates advective heat transfer from the mantle not only in the rift zone, but also much further to the east. In fluids of the Baikal rift zone range of 3He/4He values is the widest: from 4x10**-8 to 1.1x10**-5. Their variations along the strike of the rift zone are clearly patterned, namely, decrease of 3He/4He values in both directions from the Tunka depression. Accompanied by decrease in density of conductive heat flow and in size of rift basins, this trend indicates decrease in intensity of advective heat transfer from the mantle to peripheral segments of the rift zone. Comparing this trend with data on other continental rift zones and mid-ocean ridges leads to the conclusion about fundamental differences in mechanisms of interaction between the crust and the mantle in these environments.