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 Ju

SUBMITTER: Boulila S 

PROVIDER: S-EPMC8817006 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature