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  • 1
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    Climate Induced Thermocline Aging and Ventilation in the Eastern Atlantic Over the Last 32,000 Years (2023)
    Details
    Publication Date: 2024-04-02
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The radiocarbon analysis of uranium‐thorium‐dated cold‐water corals (CWCs) provides an excellent opportunity for qualitative reconstruction of past ocean circulation and water mass aging. While mid‐depth water mass aging has been studied in the Atlantic Ocean, the evolution of the thermocline is still largely unknown. Here we present a combined 〈sup〉14〈/sup〉C and 〈sup〉230〈/sup〉Th/U age record obtained from thermocline dwelling CWCs at various sites in the eastern Atlantic Ocean, with intermittently centennial resolution over the last 32 ka. Shallow dwelling CWCs off Angola, located in the South Atlantic, infer a link between the mid‐depth equatorial Atlantic and Southern Ocean. They confirm a 〈sup〉14〈/sup〉C drawdown during the Last Glacial Maximum (LGM) and advocate for a consistent Southern Hemisphere radiocarbon aging of upper thermocline waters, as well as strong depth gradients and high variability. Direct comparison with 〈sup〉14〈/sup〉C simulations carried out with an Ocean General Circulation Model yield good agreement for Angola. In contrast, the North Atlantic thermocline shows well‐ventilated water with strong variations near the position of today's Azores Front (AF), neither of which are captured by the model. During the Bølling‐Allerød, we confirm the important role of the AF in separating North and South Atlantic thermocline waters and provide further evidence of a 500 year long deep convection interruption within the Younger Dryas (YD). We conclude that the North and South Atlantic thermocline waters were separately acting carbon reservoirs during the LGM and subsequent deglaciation until the modern circulation was established during the YD.〈/p〉
    Description: Key Points: 〈list list-type="bullet"〉 〈list-item〉 〈p xml:lang="en"〉North Atlantic cold‐water corals trace well‐ventilated thermocline waters near major oceanic fronts since the Last Glacial Maximum〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Across the South Atlantic into the Southern Ocean, aged waters with large variability and connectivity are evident during the last glacial〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉The modern state of radiocarbon ventilation of the thermocline Atlantic is initiated during the Younger Dryas cold reversal〈/p〉〈/list-item〉 〈/list〉 〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: German Ministry of Education and Research
    Description: DFG‐ANR
    Description: PalMod project
    Description: https://doi.org/10.1594/PANGAEA.959508
    Keywords: 14C dating ; 230Th/U dating ; Alboran Sea ; Angola ; Atlantic ; Azores Front ; Batm age ; cold-water coral ; Mauritania ; ventilation ; radiocarbon dating ; U/Th
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Climate Induced Speleothem Radiocarbon Variability on Socotra Island from the Last Glacial Maximum to the Younger Dryas (2019)
    Copernicus
    Details
    Publication Date: 2019-09-19
    Description: In this study, the dead carbon fraction (DCF) variations in stalagmite M1-5 from Socotra Island in the western Arabian Sea were investigated through a new set of high-precision U-series and radiocarbon (14C) dates. The data reveal an extreme case of very high and also climate dependent DCF values. For M1-5 an average DCF of 56.2 ± 3.4 % is observed between 27 and 18 kyr BP. Such high DCF values indicate a high influence of aged soil organic matter (SOM) and nearly completely closed system carbonate dissolution conditions. Towards the end of the last glacial period decreasing Mg/Ca ratios suggest an increase in precipitation which caused a marked change in the soil carbon cycling as indicated by sharply decreasing DCF. This is in contrast to the relation of soil infiltration and reservoir age observed in stalagmites from temperate zones. For Socotra Island, which is influenced by the East African–Indian monsoon, we propose that more humid conditions and enhanced net-infiltration after the LGM led to denser vegetation and thus lowered the DCF by increased 14CO2 input into the soil zone. The onset of the Younger Dryas (YD) is represented in the record by the end of DCF decrease with a sudden change to much higher and extremely variable reservoir ages. Our study highlights the dramatic variability of soil carbon cycling processes and vegetation feedback on Socotra Island manifested in stalagmite reservoir ages on both long-term trends and sub-centennial timescales, thus providing evidence for climate influence on stalagmite radiocarbon. This is of particular importance for studies focussing on 14C calibration and atmospheric reconstruction through stalagmites which relies on largely climate independent soil carbon cycling above the cave.
    Print ISSN: 1814-9340
    Electronic ISSN: 1814-9359
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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    PAPER CURRENT
  • 3
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    Climate-induced speleothem radiocarbon variability on Socotra Island from the Last Glacial Maximum to the Younger Dryas (2020)
    Copernicus
    Details
    Publication Date: 2020-02-28
    Description: In this study, the dead carbon fraction (DCF) variations in stalagmite M1-5 from Socotra Island in the western Arabian Sea were investigated through a new set of high-precision U-series and radiocarbon (14C) dates. The data reveal an extreme case of very high and also climate-dependent DCF. For M1-5, an average DCF of 56.2±3.4 % is observed between 27 and 18 kyr BP. Such high DCF values indicate a high influence of aged soil organic matter (SOM) and nearly completely closed-system carbonate dissolution conditions. Towards the end of the last glacial period, decreasing Mg∕Ca ratios suggest an increase in precipitation which caused a marked change in the soil carbon cycling as indicated by sharply decreasing DCF. This is in contrast to the relation of soil infiltration and DCF as seen in stalagmites from temperate zones. For Socotra Island, which is influenced by the East African–Indian monsoon, we propose that more humid conditions and enhanced net infiltration after the Last Glacial Maximum (LGM) led to dense vegetation and thus lowered the DCF by increasing 14CO2 input into the soil zone. At the onset of the Younger Dryas (YD) a sudden change in DCF towards much higher, and extremely variable, values is observed. Our study highlights the dramatic variability of soil carbon cycling processes and vegetation feedback on Socotra Island manifested in stalagmite DCF on both long-term trends and sub-centennial timescales, thus providing evidence for climate influence on stalagmite radiocarbon. This is of particular relevance for speleothem studies that aim to reconstruct past atmospheric 14C (e.g., for the purposes of 14C calibration), as these would rely on largely climate-independent soil carbon cycling above the cave.
    Print ISSN: 1814-9324
    Electronic ISSN: 1814-9332
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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    PAPER CURRENT
  • 4
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    How the climate shapes stalagmites—A comparative study of model and speleothem at the Sofular Cave, Northern Turkey (2022)
    Frontiers
    Details
    Publication Date: 2022-11-08
    Description: Understanding how stalagmites grow under changing climate conditions is of great significance for their application as a paleoclimate archive. In this study, we present a shape modeling approach to stalagmite growth by combining three existing models accounting for climate variables, karst water chemistry, and speleothem deposition. The combined model requires only four input parameters: calcium concentration of the water drop, drip interval, cave temperature, and cave carbon dioxide (CO2) concentration. Using the output of the coupled atmosphere–ocean–land surface model MPI-ESM1.2 and the CaveCalc model for speleothem chemistry, we simulated stalagmite growth at Sofular Cave, Northern Turkey, (in the last 25 kyr) and compared the results to those of the existing So-1 stalagmite from the same cave. This approach allows simulating, completely independent of measured boundary conditions, a stalagmite geometry that follows the trend of the experimental data for the growth rate, with input parameters within the respective error ranges. When testing the sensitivity of the individual model parameters, the model suggests that the stalagmite radius mainly depends on the drip interval, whereas the growth rate is driven by the calcium concentration of the water drop. The model is also capable of showing some basic phenomena, like a decrease in growth rate (as observed in the real stalagmite), as CO2 concentration in the cave increases. The coupling of input parameters for the model to climate models represents the first attempt to understand an important climate archive in its shape and isotope content and opens the possibility for a new inverse approach to paleoclimate variables and model constraints.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    PAPER (OCEANREP)
  • 5
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    Cold-water coral Atlantic thermocline ventilation records over the last 32,000 years (2023)
    PANGAEA
    Details
    Publication Date: 2023-09-23
    Description: The radiocarbon analysis of uranium-thorium-dated cold-water corals (CWCs) provides an excellent opportunity for qualitative reconstruction of past ocean circulation and water mass aging. While mid-depth water mass aging has been studied in the Atlantic Ocean, the evolution of the thermocline, tightly coupled to the atmosphere, is still largely unknown. Here we present a combined 14C and 230Th/U age record obtained from thermocline dwelling CWCs with partially centennial resolution over the last 32 ka at various locations in the central and east Atlantic Ocean (Azores Front, Mauritania, Angola), as well as in the Alboran Sea.
    Keywords: 14C dating; 230Th/U dating; Alboran Sea; Angola; Atlantic; Azores Front; Batm age; cold-water coral; Mauritania; radiocarbon dating; U/Th; ventilation
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 6
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    Radiocarbon dating of Atlantic cold-water corals over the last 32,000 years (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: The radiocarbon analysis of uranium-thorium-dated cold-water corals (CWCs) provides an excellent opportunity for qualitative reconstruction of past ocean circulation and water mass aging. While mid-depth water mass aging has been studied in the Atlantic Ocean, the evolution of the thermocline, tightly coupled to the atmosphere, is still largely unknown. Here we present a combined 14C and 230Th/U age record obtained from thermocline dwelling CWCs with partially centennial resolution over the last 32 ka at various locations in the central and east Atlantic Ocean (Azores Front, Mauritania, Angola), as well as in the Alboran Sea. Preparation for radiocarbon dating took place at the Institute of Environmental Physics, Heidelberg University, Germany (Therre et al., 2021). The samples were measured on an accelerator mass spectrometer (MICADAS) at the Curt-Engelhorn Center for Archaeometry in Mannheim, Germany (Kromer et al., 2013, Synal et al., 2007).
    Keywords: 1057-2; 1065-1; 1070-2; 1071-2; 14C dating; 230Th/U dating; Age, 14C AMS, Mini Carbon Dating System (MICADAS); Age, dated; Age, Uranium-Thorium; Alboran Sea; Alboran Sea - E-Melilla - Brittlestar Ridge I; Angola; Area/locality; Atlantic; Azores Front; Banda mounds; Batm age; Benthic-atmosphere age; Calendar age; Calendar age, standard deviation; Campaign of event; Canyon S of Timiris mound chain; cold-water coral; Comment; Core; Date/Time of event; ELEVATION; EUROFLEETS; Event label; Fraction modern carbon; Fraction modern carbon, standard deviation; GC; GeoB14884-1; GeoB14890-2; GeoB14899-1; GeoB14904-2; GeoB14905-2; GeoB18118-1; GeoB18118-2; GeoB20908-2; GeoB20928-1; GeoB20933-1; GeoB20935-1; GeoB20953-2; GeoB20955-1; GeoB20958-1; GeoB23109-1; GeoB23110-1; GeoB23112-1; GeoB23113-1; GeoB23120-1; GeoB23121-1; GeoB23147-1; GeoB23153-1; GeoB23404-1; GeoB23415-1; GeoB23425-1; GeoB23429-1; GeoB23436-1; GeoB23437-1; Giant box corer; GKG; Grab; GRAB; Gravity corer; Laboratory code/label; Latitude of event; Location; Longitude of event; M122; M122_091-2; M122_111-1; M122_116-1; M122_118-1; M122_137-2; M122_139-1; M122_142-1; M151; M151_100-1; M151_10-1; M151_110-1; M151_114-1; M151_12-1; M151_121-1; M151_122-1; M151_13-1; M151_20-1; M151_21-1; M151_47-1; M151_53-1; M151_89-1; M151_9-1; Maria S. Merian; Marion Dufresne (1995); Mauritania; MD13-3455G; MD13-3459G; MD194; Mean values of ellipses; MeBo70; Meteor (1986); Method/Device of event; MSM16/3; MSM16/3_1051-1; MSM36; northern Banda slide; radiocarbon dating; Remotely operated vehicle SQUID; ROV SQUID; U/Th; ventilation; Δ14C; ΔΔ14C
    Type: Dataset
    Format: text/tab-separated-values, 1840 data points
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    DATA PANGAEA
  • 7
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    Uranium-thorium dating of Atlantic cold-water corals from the last 32,000 years (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-27
    Description: Uranium-thorium dating offers the possibility of absolute age determination of cold-water corals (CWCs). We present here the complementary dataset to "Radiocarbon dating of Atlantic cold-water corals over the last 32.000 years". It contains 230Th/U ages obtained on CWCs from various locations in the central and east Atlantic Ocean, as well as the Alboran Sea. It also includes an update of previously published data, necessitated by a recently discovered "ghost signal" (Kerber et al., 2023). U and Th were extracted according to the method of Wefing et al. (2017). The high precision isotopic measurements were performed on a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS, Thermo Fisher Neptune Plus) at the Institute of Environmental Physics, Heidelberg University, Germany. For age calculations the half-lives of 234U and 230Th published in (Cheng et al., 2013) were used. The mass spectrometry setup and data treatment follows the methods recently updated in great detail by Kerber et al. (2023).
    Keywords: 1057-2; 1065-1; 1070-2; 1071-2; 14C dating; 230Th/U dating; Age, dated; Age, dated standard deviation; Age, Uranium-Thorium, corrected; Age, Uranium-Thorium, uncorrected; Alboran Sea; Alboran Sea - E-Melilla - Brittlestar Ridge I; Angola; Area/locality; Atlantic; Azores Front; Banda mounds; Batm age; Campaign of event; Canyon S of Timiris mound chain; cold-water coral; Core; Date/Time of event; DEPTH, sediment/rock; ELEVATION; EUROFLEETS; Event label; GC; GeoB14884-1; GeoB14890-2; GeoB14899-1; GeoB14904-2; GeoB14905-2; GeoB18118-1; GeoB18118-2; GeoB20908-2; GeoB20928-1; GeoB20933-1; GeoB20935-1; GeoB20953-2; GeoB20955-1; GeoB20958-1; GeoB23109-1; GeoB23110-1; GeoB23112-1; GeoB23113-1; GeoB23120-1; GeoB23121-1; GeoB23147-1; GeoB23153-1; GeoB23404-1; GeoB23415-1; GeoB23425-1; GeoB23429-1; GeoB23436-1; GeoB23437-1; Giant box corer; GKG; Grab; GRAB; Gravity corer; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Laboratory code/label; Latitude of event; Location; Longitude of event; M122; M122_091-2; M122_111-1; M122_116-1; M122_118-1; M122_137-2; M122_139-1; M122_142-1; M151; M151_100-1; M151_10-1; M151_110-1; M151_114-1; M151_12-1; M151_121-1; M151_122-1; M151_13-1; M151_20-1; M151_21-1; M151_47-1; M151_53-1; M151_89-1; M151_9-1; Maria S. Merian; Marion Dufresne (1995); Mauritania; MD13-3455G; MD13-3459G; MD194; MeBo70; Meteor (1986); Method/Device of event; MSM16/3; MSM16/3_1051-1; MSM36; northern Banda slide; radiocarbon dating; Reference/source; Remotely operated vehicle SQUID; ROV SQUID; Species; Thorium-230/Thorium-232, standard deviation; Thorium-230/Thorium-232 ratio; Thorium-230/Uranium-238, standard deviation; Thorium-230/Uranium-238 ratio; Thorium-232; Thorium-232, standard deviation; U/Th; Uranium-238; Uranium-238, standard deviation; ventilation; δ234 Uranium; δ234 Uranium, standard deviation; δ234 Uranium (0); δ234 Uranium (0), standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2609 data points
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    DATA PANGAEA
  • 8
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    U-series and radiocarbon dating results of stalagmite M1-5 from Moomi Cave, Socotra Island (2019)
    PANGAEA
    Details
    Publication Date: 2024-03-25
    Description: In this study, the dead carbon fraction (DCF) variations in stalagmite M1-5 from Socotra Island in the western Arabian Sea were investigated through a new set of high-precision U-series and radiocarbon (14C) dates. The data reveal an extreme case of very high and also climate dependent DCF values. For M1-5 an average DCF of 56.2 ± 3.4 % is observed between 27 and 18 kyr BP. Such high DCF values indicate a high influence of aged soil organic matter (SOM) and nearly completely closed system carbonate dissolution conditions. Towards the end of the last glacial period decreasing Mg/Ca ratios suggest an increase in precipitation which caused a marked change in the soil carbon cycling as indicated by sharply decreasing DCF. This is in contrast to the relation of soil infiltration and reservoir age observed in stalagmites from temperate zones. For Socotra Island, which is influenced by the East African-Indian monsoon, we propose that more humid conditions and enhanced net-infiltration after the LGM led to denser vegetation and thus lowered the DCF by increased 14CO2 input into the soil zone. The onset of the Younger Dryas (YD) is represented in the record by the end of DCF decrease with a sudden change to much higher and extremely variable reservoir ages. Our study highlights the dramatic variability of soil carbon cycling processes and vegetation feedback on Socotra Island manifested in stalagmite reservoir ages on both long-term trends and sub-centennial timescales, thus providing evidence for climate influence on stalagmite radiocarbon. This is of particular importance for studies focussing on 14C calibration and atmospheric reconstruction through stalagmites which relies on largely climate independent soil carbon cycling above the cave.
    Keywords: Dead Carbon Fraction; radiocarbon; Socotra; speleothem; U-series
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 9
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    Radiocarbon dating of stalagmite M1-5 from Moomi Cave, Socotra Island (2019)
    PANGAEA
    Details
    Publication Date: 2024-03-25
    Description: In this study, the dead carbon fraction (DCF) variations in stalagmite M1-5 from Socotra Island in the western Arabian Sea were investigated through a new set of high-precision U-series and radiocarbon (14C) dates. The data reveal an extreme case of very high and also climate dependent DCF values. For M1-5 an average DCF of 56.2 ± 3.4 % is observed between 27 and 18 kyr BP. Such high DCF values indicate a high influence of aged soil organic matter (SOM) and nearly completely closed system carbonate dissolution conditions. Towards the end of the last glacial period decreasing Mg/Ca ratios suggest an increase in precipitation which caused a marked change in the soil carbon cycling as indicated by sharply decreasing DCF. This is in contrast to the relation of soil infiltration and reservoir age observed in stalagmites from temperate zones. For Socotra Island, which is influenced by the East African-Indian monsoon, we propose that more humid conditions and enhanced net-infiltration after the LGM led to denser vegetation and thus lowered the DCF by increased 14CO2 input into the soil zone. The onset of the Younger Dryas (YD) is represented in the record by the end of DCF decrease with a sudden change to much higher and extremely variable reservoir ages. Our study highlights the dramatic variability of soil carbon cycling processes and vegetation feedback on Socotra Island manifested in stalagmite reservoir ages on both long-term trends and sub-centennial timescales, thus providing evidence for climate influence on stalagmite radiocarbon. This is of particular importance for studies focussing on 14C calibration and atmospheric reconstruction through stalagmites which relies on largely climate independent soil carbon cycling above the cave.
    Keywords: Accelerator mass spectrometry (AMS); AGE; Age, AMS 14C conventional; Age, dated; Age, standard deviation; Age, Uranium-Thorium; Carbon-14, modern; Carbon-14, modern, atmosphere; Carbon-14, modern, atmosphere, standard deviation; Carbon-14, modern, error; Carbon-14, modern, initial; Carbon-14, modern, initial, standard deviation; Carbon-14, modern, standard deviation; Dead carbon fraction; Dead Carbon Fraction; Dead carbon fraction, standard deviation; DISTANCE; Moomi_Cave_2002; Moomi_Cave_M1-5; radiocarbon; Sample code/label; Socotra; Socotra Island, Arabian Sea; speleothem; Speleothem sample; SPS; U-series
    Type: Dataset
    Format: text/tab-separated-values, 1014 data points
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    DATA PANGAEA
  • 10
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    Uranium and Thorium in stalagmite M1-5 from Moomi Cave, Socotra Island (2019)
    PANGAEA
    Details
    Publication Date: 2024-03-25
    Description: In this study, the dead carbon fraction (DCF) variations in stalagmite M1-5 from Socotra Island in the western Arabian Sea were investigated through a new set of high-precision U-series and radiocarbon (14C) dates. The data reveal an extreme case of very high and also climate dependent DCF values. For M1-5 an average DCF of 56.2 ± 3.4 % is observed between 27 and 18 kyr BP. Such high DCF values indicate a high influence of aged soil organic matter (SOM) and nearly completely closed system carbonate dissolution conditions. Towards the end of the last glacial period decreasing Mg/Ca ratios suggest an increase in precipitation which caused a marked change in the soil carbon cycling as indicated by sharply decreasing DCF. This is in contrast to the relation of soil infiltration and reservoir age observed in stalagmites from temperate zones. For Socotra Island, which is influenced by the East African-Indian monsoon, we propose that more humid conditions and enhanced net-infiltration after the LGM led to denser vegetation and thus lowered the DCF by increased 14CO2 input into the soil zone. The onset of the Younger Dryas (YD) is represented in the record by the end of DCF decrease with a sudden change to much higher and extremely variable reservoir ages. Our study highlights the dramatic variability of soil carbon cycling processes and vegetation feedback on Socotra Island manifested in stalagmite reservoir ages on both long-term trends and sub-centennial timescales, thus providing evidence for climate influence on stalagmite radiocarbon. This is of particular importance for studies focussing on 14C calibration and atmospheric reconstruction through stalagmites which relies on largely climate independent soil carbon cycling above the cave.
    Keywords: AGE; Age, standard deviation; Dead Carbon Fraction; DISTANCE; Laboratory code/label; Moomi_Cave_2002; Moomi_Cave_M1-5; radiocarbon; Socotra; Socotra Island, Arabian Sea; speleothem; Speleothem sample; SPS; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; U-series; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 740 data points
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    DATA PANGAEA
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