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A Jurassic record encodes an analogous Dansgaard–Oeschger climate periodicity

Abstract : Earth’s past climate exhibits short-term (1500-year) pronounced fluctuations during the last glacial period, called Dansgaard–Oeschger (DO) glacial events, which have never been detected in pre-Quaternary times. The record of DO equivalent climate variability in Mesozoic strata can provide constraints on understanding these events. Here we highlight a prominent 1500-year cyclicity in a Jurassic (~ 155 Ma) ice-free sedimentary record from the Tethyan Basin. This Jurassic 1500-year cyclicity is encoded in high-resolution magnetic susceptibility (MS) proxy data reflecting detrital variations, and expressed as marl-limestone couplets. Additionally, MS data detect the modulation of these DO-scale couplets by supercouplet sets, reflecting the precession and its harmonics. We suggest that this Jurassic DO-like cyclicity may originate from paleo-monsoon-like system, analogous to the record of DO events in the Pleistocene East Asian monsoon archives. Paleogeographic reconstructions and atmosphere–ocean simulations further support the potential existence of strong, ancient monsoon circulations in the Tethyan Basin during the Jurassic.
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Submitted on : Tuesday, February 8, 2022 - 10:22:20 AM
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Slah Boulila, Bruno Galbrun, Silvia Gardin, Pierre Pellenard. A Jurassic record encodes an analogous Dansgaard–Oeschger climate periodicity. Scientific Reports, Nature Publishing Group, 2022, 12 (1), pp.1968. ⟨10.1038/s41598-022-05716-8⟩. ⟨hal-03561244⟩



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