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Eocene–Oligoceneglaciation on a highcentral TibetanPlateau Guoqing XiaChihua WuAhmed Mansour2023 год

Eocene–Oligocene glaciation on a high central Tibetan Plateau
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Аннотация: Abstract The nature of glaciation (bipolar vs. unipolar) during the Eocene–Oligocene transition (EOT) remains unresolved. Here, we report the occurrence of frost marks, ice-rafted debris (IRD), and glendonites from the Upper Eocene to Lower Oligocene Niubao Formation (Fm.) deposited in a proglacial lake above glaciolacustrine conglomerates and diamictite facies in the Lunpola Basin, central Tibetan Plateau (CTP). Magnetostratigraphy dates these cryospheric deposits to ca. 36.2–31.8 Ma, synchronous with a stratigraphic interval containing IRD offshore of SE Greenland and in the Barents, Chukchi, and Laptev Seas, suggesting a strong continental-oceanic coupling. Our results provide robust continental evidence for intermittent cryospheric processes in the midlatitude Northern Hemisphere during the late Eocene and EOT. The global cold snap EOT-1 influenced already glacierized high-altitude mountains, lowering equilibrium line altitudes (ELAs) of glaciers and leading to local development of ice fields, ice caps, and valley glaciers with proglacial lake systems, such as the one recorded in the Niubao Fm. The record of IRD, glendonites, and frost marks before the onset of EOT-1 points to an active cryosphere on a plateau already elevated by ca. 36.2 Ma.
Год издания: 2023
Авторы: Guoqing Xia, Chihua Wu, Ahmed Mansour, Xin Jin, Haisheng Yi, Gaojie Li, Qiushuang Fan, Zhiqiang Shi, Julian B. Murton, Junling Pei, Juan Pedro Rodríguez‐López
Издательство: Geological Society of America
Источник: Geology
Ключевые слова: Geology and Paleoclimatology Research, Paleontology and Stratigraphy of Fossils, Geological formations and processes
Другие ссылки: Geology (PDF)
Geology (HTML)
OPAL (Open@LaTrobe) (La Trobe University) (PDF)
OPAL (Open@LaTrobe) (La Trobe University) (HTML)
Sussex Research Online (University of Sussex) (PDF)
Sussex Research Online (University of Sussex) (HTML)
gsapubs.figshare.com (PDF)
doi.org (HTML)
gsapubs.figshare.com (PDF)
doi.org (HTML)