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Qaidam Basin leaf fossils show northeastern Tibet was high, wet and cool in the early Oligocene

Research output: Contribution to journalArticle

Original languageEnglish
Article number116175
Number of pages10
JournalEarth and Planetary Science Letters
Volume537
Early online date28 Feb 2020
DOIs
DateAccepted/In press - 20 Feb 2020
DateE-pub ahead of print (current) - 28 Feb 2020
DatePublished - 1 May 2020

Abstract

The Paleogene environment of today's semi-arid and arid Central Asia is poorly quantified and knowledge of the paleoelevation of northern Tibet remains elusive, yet both are crucially important for understanding inter-relationships between growth of the Tibetan Plateau and Asian monsoon development. Here, we apply the Climate-Leaf Analysis Multivariate Program (CLAMP) and moist enthalpy method to the newly discovered early Oligocene (30.8 Ma) fossil leaves from the Qaidam Basin, to reconstruct quantitatively the paleoclimate and paleoelevation of this critical part of northern Tibet. We find the Qaidam Basin floor vegetation was likely at ∼3.3 ± 1.4 km in the early Oligocene, similar to that of the present basin floor but higher than the rising Himalaya at that time, and experienced a temperate, moderately wet climate. Near-freezing (1.4 ± 3.5 °C) winters accompanied cool summers (∼23 ± 2.9 °C). Annual precipitation likely exceeded 1000 mm (growing season precipitation of 1229 ± 643 mm) with subdued (non-monsoonal) seasonality in which summers were drier than winters. This finding challenges geodynamic models that envisage a Miocene or later uplift of northern Tibet and progressive uplift from the south.

    Research areas

  • Qaidam, Oligocene, physiognomy, general circulation climate model, paleoelevation, PALEOCLIMATE

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    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://doi.org/10.1016/j.epsl.2020.116175 . Please refer to any applicable terms of use of the publisher.

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    Embargo ends: 28/02/21

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    Licence: CC BY-NC-ND

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