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d¹³C signal of earthworm calcite granules: A new proxy for palaeoprecipitation reconstructions during the Last Glacial in western Europe

Charlotte Prud’homme; Christophe Lécuyer; Pierre Antoine; Christine Hatté; Olivier Moine; François Fourel; Romain Amiot; François Martineau; Denis-Didier Rousseau

Title:
d¹³C signal of earthworm calcite granules: A new proxy for palaeoprecipitation reconstructions during the Last Glacial in western Europe
Author(s):
Prud’homme, Charlotte
Lécuyer, Christophe
Antoine, Pierre
Hatté, Christine
Moine, Olivier
Fourel, François
Amiot, Romain
Martineau, François
Rousseau, Denis-Didier
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Volume:
179
Persistent URL:
Book/Journal Title:
Quaternary Science Reviews
Geographic Area:
Rhine River Valley
Europe
Abstract:
Quantification of paleoprecipitation during the Last Glacial is a key element to reconstruct palaeoclimates. Recently, fossil calcite granules have been identified in loess sequences with high contents in specific horizons. In this study, we explored for the first time the potential of this new bio-indicator as a climatic proxy for precipitation in western Europe during the Last Glacial. We extracted 30 granules from eleven samples belonging to three tundra gleys and two brown soils from the Nussloch loess sequence previously dated between 50 and 20 ka. Stable carbon isotope measurements were performed on each granule and duplicated. Throughout the studied section, δ¹³C values range from −15.4 to −10.3‰ for tundra gleys and from −14.9 to −9.5‰ for brown soils. By taking into account the fractionation factor between the carbon ingested by the earthworm and the carbon output of the granules, the δ¹³C values of these granules reflect the composition of the C3 plant vegetation cover. Thus, we estimated the δ¹³C of the plants with a mean value of −24.3 ± 0.9‰ for tundra gleys and −24.1 ± 0.9‰ for brown soils, which are in agreement with values obtained from organic matter preserved in sediments. Palaeoprecipitation range over both tundra gley horizons and brown soils were estimated at about 333[159–574] mm/yr by using an empirical relationship determined between present-day plant leaf isotopic discrimination and the mean annual precipitation. This original preliminary study highlights the potential of earthworm calcite granule δ¹³C measurements as a new proxy for paleoprecipitation during the Last Glacial interstadials in continental environments.
Subject(s):
Paleoclimatology
Paleopedology
Last Glacial Maximum
Publisher DOI:
https://doi.org/10.1016/j.quascirev.2017.11.017
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Metadata:
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Suggested Citation:
Charlotte Prud’homme, Christophe Lécuyer, Pierre Antoine, Christine Hatté, Olivier Moine, François Fourel, Romain Amiot, François Martineau, Denis-Didier Rousseau, , d¹³C signal of earthworm calcite granules: A new proxy for palaeoprecipitation reconstructions during the Last Glacial in western Europe, Columbia University Academic Commons, .

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