2024
DOI: 10.1029/2023gc011127
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Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China

Siding Jin,
Haiyang Cao,
Mingcai Hou
et al.

Abstract: The Hirnantian period, making the end of the Ordovician with significant mass extinctions and large ice‐sheets, is a critical interval for studying paleoclimate variations. This research represents the first cyclostratigraphic study of this period, utilizing high‐resolution (1 mm sampling rate) geochemical data from the ∼7‐m thick SH‐1 drill core, capturing the latest Ordovician glaciation. Our analysis identifies the presence of Milankovitch cycles with periods of 17–21, ∼33, and ∼100‐kyr, suggesting an optim… Show more

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