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  • 1
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    Geochemistry nd isotopic composition of Indian Ocean sediments
    PANGAEA
    In:  Supplement to: Thomas, Alexander L; Henderson, Gideon M; McCave, I Nick (2007): Constant bottom water flow into the Indian Ocean for the past 140 ka indicated by sediment 231PAPa/230Th ratios. Paleoceanography, 22(4), PA4210, https://doi.org/10.1029/2007PA001415
    Details
    Publication Date: 2023-05-12
    Description: A down-core 231Pa/230Th record has been measured from the southwestern Indian Ocean to reconstruct the history of deep water flow into this basin over the last glacial-interglacial cycle. The (231Paxs/230Thxs)0 ratio throughout the record is nearly constant at approximately 0.055, significantly lower than the production ratio of 0.093, indicating that the proxy is sensitive to changes in circulation and/or sediment flux at this site. The consistent value suggests that there has been no change in the inflow of Antarctic Bottom Water to the Indian Ocean during the last 140 ka, in contrast to the changes in deep circulation thought to occur in other ocean basins. The stability of the (231Paxs/230Thxs)0 value in the record contrasts with an existing sortable silt (SS) record from the same core. The observed equation image variability is attributed to a local geostrophic effect amplifying small changes in circulation. A record of authigenic U from the same core suggests that there was reduced oxygen in bottom waters at the core locality during glacial periods. The consistency of the (231Paxs/230Thxs)0 record implies that this could not have arisen by local changes in productivity, thus suggesting a far-field control: either globally reduced bottom water oxygenation or increased productivity south of the Opal Belt during glacials.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Geochemical data for drilled powder samples from two fossil Porites corals from Integrated Ocean Drilling Program Expedition 310
    PANGAEA
    In:  Supplement to: Hathorne, Ed C; Felis, Thomas; James, Rachael H; Thomas, Alexander L (2011): Laser ablation ICP-MS screening of corals for diagenetically affected areas applied to Tahiti corals from the last deglaciation. Geochimica et Cosmochimica Acta, 75, 1490-1506, https://doi.org/10.1016/j.gca.2010.12.011
    Details
    Publication Date: 2023-06-27
    Description: Fossil corals are unique archives of past seasonal climate variability, providing vital information about seasonal climate phenomena such as ENSO and monsoons. However, submarine diagenetic processes can potentially obscure the original climate signals and lead to false interpretations. Here we demonstrate the potential of laser ablation ICP-MS to rapidly detect secondary aragonite precipitates in fossil Porites colonies recovered by Integrated Ocean Drilling Program (IODP) Expedition 310 from submerged deglacial reefs off Tahiti. High resolution (100 µm) measurements of coralline B/Ca, Mg/Ca, S/Ca, and U/Ca ratios are used to distinguish areas of pristine skeleton from those afflicted with secondary aragonite. Measurements of coralline Sr/Ca, U/Ca and oxygen isotope ratios, from areas identified as pristine, reveal that the seasonal range of sea surface temperature in the tropical south Pacific during the last deglaciation (14.7 and 11 ka) was similar to that of today.
    Keywords: 310-M0007B; 310-M0025B; Boron/Calcium ratio; DISTANCE; DP Hunter; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp310; Inductively coupled plasma - mass spectrometry (ICP-MS); Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Magnesium/Calcium ratio; Manganese/Calcium ratio; Mass spectrometry; Sample code/label; Sample code/label 2; Strontium/Calcium ratio; TAH-02A-5H; TAH-03A-3A; Tahiti, offshore Maraa; Tahiti, offshore Tiarei; Tahiti Sea Level; Uranium/Calcium ratio; δ13C, skeletal carbonate; δ18O, skeletal carbonate
    Type: Dataset
    Format: text/tab-separated-values, 1038 data points
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  • 3
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    (Table S1) U, Th, 230Th, and 231Pa concentrations and U isotopic composition for surface sediments from RRS Charles Darwin Cruises 129 (WIND) and 154
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; Agulhas Current; BC; Box corer; CD129; CD154; CD154-04-4PK; CD154-05-5PK; CD154-16-15K; CD154-24-25K; Charles Darwin; DEPTH, sediment/rock; Elevation of event; Event label; KAL; Kasten corer; Latitude of event; Longitude of event; Protactinium-231/Thorium-230 excess; Protactinium-231/Thorium-230 excess, standard deviation; Protactinium-231 excess; Protactinium-231 excess, standard deviation; Sample code/label; Standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium, authigenic; Uranium, standard deviation; Uranium/Thorium ratio; Uranium-238; Uranium-238, standard deviation; West Indian Ocean; WIND; WIND-15B; WIND-28B; WIND-3B; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 129 data points
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  • 4
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    (Table S2) U, Th, 230Th, and 231Pa concentrations and U isotopic composition for sediment core WIND28K samples (2007)
    PANGAEA
    Details
    Publication Date: 2023-12-18
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; AGE; CD129; Charles Darwin; DEPTH, sediment/rock; KAL; Kasten corer; Protactinium-231/Thorium-230 excess; Protactinium-231/Thorium-230 excess, standard deviation; Protactinium-231 excess; Protactinium-231 excess, standard deviation; Ratio; Sample code/label; Sedimentation rate; Standard deviation; SW Indian Ocean; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium, authigenic; Uranium, standard deviation; Uranium/Thorium ratio; Uranium-238; Uranium-238, standard deviation; WIND; WIND-28K; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 669 data points
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  • 5
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    (Appendix A2) Paleomagnetic of ODP Hole 172-1062D (2012)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 172-1062D; AGE; ARM, Intensity after demagnetization; ARM Susceptibility/susceptibility ratio; Blake-Bahama Outer Ridge, North Atlantic Ocean; ChRM, Declination; ChRM, Inclination; Coercivity of remanence; Depth, composite revised; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; IRM, Intensity, per unit volume; Joides Resolution; Leg172; NRM, Intensity; NRM, Median destructive field/ARM, Median destructive field ratio; NRM, Median destructive field/IRM, Median destructive field ratio; NRM Susceptibility/susceptibility ratio; Ocean Drilling Program; ODP; Paleolatitude; Paleolongitude; Sample code/label; Sample ID; S-ratio (hematite/magnetite); Susceptibility, specific
    Type: Dataset
    Format: text/tab-separated-values, 1960 data points
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  • 6
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    (Appendix A1) Stable oxygen isotope ratios of Globorotalia inflata from ODP Hole 172-1062E (2012)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 172-1062E; Blake-Bahama Outer Ridge, North Atlantic Ocean; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Globorotalia inflata, δ18O; Joides Resolution; Leg172; Mass spectrometer ThermoFisher Delta V; Ocean Drilling Program; ODP; Sample code/label; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 226 data points
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  • 7
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    (Appendix A2) Paleomagnetic of ODP Hole 172-1062E (2012)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 172-1062E; AGE; ARM, Intensity after demagnetization; ARM Susceptibility/susceptibility ratio; Blake-Bahama Outer Ridge, North Atlantic Ocean; ChRM, Declination; ChRM, Inclination; Coercivity of remanence; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; IRM, Intensity, per unit volume; Joides Resolution; Leg172; NRM, Intensity; NRM, Median destructive field/ARM, Median destructive field ratio; NRM, Median destructive field/IRM, Median destructive field ratio; NRM Susceptibility/susceptibility ratio; Ocean Drilling Program; ODP; Paleolatitude; Paleolongitude; Sample code/label; Sample ID; S-ratio (hematite/magnetite); Susceptibility, specific
    Type: Dataset
    Format: text/tab-separated-values, 1723 data points
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  • 8
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    (Appendix A2) Paleomagnetic of ODP Hole 172-1062B (2012)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 172-1062B; AGE; Blake-Bahama Outer Ridge, North Atlantic Ocean; ChRM, Declination; ChRM, Inclination; Depth, composite revised; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg172; NRM, Median destructive field/ARM, Median destructive field ratio; NRM, Median destructive field/IRM, Median destructive field ratio; Ocean Drilling Program; ODP; Paleolatitude; Paleolongitude; Sample code/label; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 646 data points
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  • 9
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    Isotope analysis, age calculation and calcite concentration from IODP Hole 310-M0005D (2012)
    PANGAEA
    In:  Supplement to: Thomas, Alexander L; Fujita, Kazuhiko; Iryu, Yasufumi; Bard, Edouard; Cabioch, Guy; Camoin, Gilbert; Cole, Julia E; Deschamps, Pierre; Durand, Nicolas; Hamelin, Bruno; Heindel, Katrin; Henderson, Gideon M; Mason, Andrew J; Matsuda, Hiroki; Menabreaz, Lucie; Omori, Akitoshi; Quinn, Terry; Sakai, Saburo; Sato, Tokiyuki; Sugihara, Kaoru; Takahashi, Yasunari; Thouveny, Nicolas; Tudhope, Alexander W; Webster, Jody M; Westphal, Hildegard; Yokoyama, Yusuke (2012): Assessing subsidence rates and paleo water-depths for Tahiti reefs using U-Th chronology of altered corals. Marine Geology, 295-298, 86-94, https://doi.org/10.1016/j.margeo.2011.12.006
    Details
    Publication Date: 2024-01-25
    Description: We present uranium-thoriumchronology for a 102 mcore through a Pleistocene reef at Tahiti (French Polynesia) sampled during IODP Expedition 310 "Tahiti Sea Level". We employ total and partial dissolution procedures on the older coral samples to investigate the diagenetic overprint of the uranium-thoriumsystem. Although alteration of the U-Th system cannot be robustly corrected, diagenetic trends in the U-Th data, combined with sea level and subsidence constraints for the growth of the corals enables the age of critical samples to be constrained to marine isotope stage 9. We use the ages of the corals, together with d18O based sea-level histories, to provide maximum constraints on possible paleo water-depths. These depth constraints are then compared to independent depth estimates based on algal and foraminiferal assemblages, microbioerosion patterns, and sedimentary facies, confirming the accuracy of these paleo water-depth estimates. We also use the fact that corals could not have grown above sea level to place amaximumconstraint on the subsidence rate of Tahiti to be 0.39 m ka**-1,with the most likely rate being close to the existing minimum estimate of 0.25m ka**-1.
    Keywords: 310-M0005D; DP Hunter; DRILL; Drilling/drill rig; Exp310; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; TAH-03A-4C; Tahiti, offshore Maraa; Tahiti Sea Level
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
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    (Appendix 1) Coral analysis and isostatic rebound effects from different Holes of IODP Expedition 310 (2012)
    PANGAEA
    In:  Supplement to: Deschamps, Pierre; Durand, Nicolas; Bard, Edouard; Hamelin, Bruno; Camoin, Gilbert; Thomas, Alexander L; Henderson, Gideon M; Okuno, Junichi; Yokoyama, Yusuke (2012): Ice-sheet collapse and sea-level rise at the Bølling warming 14,600 years ago. Nature, 483, 559-564, https://doi.org/10.1038/nature10902
    Details
    Publication Date: 2024-01-25
    Description: Past sea-level records provide invaluable information about the response of ice sheets to climate forcing. Some such records suggest that the last deglaciation was punctuated by a dramatic period of sea-level rise, of about 20 metres, in less than 500 years. Controversy about the amplitude and timing of this meltwater pulse (MWP-1A) has, however, led to uncertainty about the source of the melt water and its temporal and causal relationships with the abrupt climate changes of the deglaciation. Here we show that MWP-1A started no earlier than 14,650 years ago and ended before 14,310 years ago, making it coeval with the Bølling warming. Our results, based on corals drilled offshore from Tahiti during Integrated Ocean Drilling Project Expedition 310, reveal that the increase in sea level at Tahiti was between 12 and 22 metres, with a most probable value between 14 and 18 metres, establishing a significant meltwater contribution from the Southern Hemisphere. This implies that the rate of eustatic sea-level rise exceeded 40 millimetres per year during MWP-1A.
    Keywords: 310-M0005A; 310-M0005C; 310-M0005D; 310-M0007A; 310-M0007B; 310-M0009A; 310-M0015A; 310-M0016A; 310-M0018A; 310-M0019A; 310-M0020A; 310-M0021A; 310-M0021B; 310-M0023A; 310-M0023B; 310-M0024A; 310-M0025B; 310-M0026A; Age, dated; Age, dated standard deviation; Analytical method; Area/locality; Calculated; Coral; Depth, reconstructed; DEPTH, water; Description; DP Hunter; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp310; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Mass spectrometer Thermal Ionization, VG-54; Normalized, NBS; Number; Sample code/label; TAH-01A-3; TAH-01A-3A; TAH-02A-4F; TAH-02A-4G; TAH-02A-4H; TAH-02A-5; TAH-02A-5D; TAH-02A-5F; TAH-02A-5H; TAH-02A-5I; TAH-03A-1; TAH-03A-1A; TAH-03A-1E; TAH-03A-3; TAH-03A-3A; TAH-03A-4; TAH-03A-4B; TAH-03A-4C; Tahiti, offshore Faaa; Tahiti, offshore Maraa; Tahiti, offshore Tiarei; Tahiti Sea Level; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; Uranium-238; Uranium-238, standard deviation; Uranium-238/Thorium-232 activity ratio; Uranium-238/Thorium-232 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1972 data points
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