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MULTIPLE PALAEOECOLOGICAL PROXIES CONSTRAIN THE INTERPLAY BETWEEN TIBETAN PLATEAU GROWTH, THE PROTO-MONSOONS AND FLORAL DISPERSAL DURING THE EARLY INDIA-ASIA COLLISION

Abstract : The interplay between tectonics, monsoonal climate regimes, and biodiversity of the Tibetan Plateau has been the recent focus of much investigation. However, the linkages between orogeny and climate, as well as their impacts on floral diversity, are still unclear. The Nangqian Basin of east-central Tibet holds a key Paleocene– Eocene record of deformation and environmental change during the early stage of the India-Asia collision, the development of the Tibetan Plateau, and the proto-monsoons. Here, we examine new palynoassemblages recovered from this basin and apply Fourier Transform Infrared (FTIR) microspectroscopy to quantify ultraviolet irradiance based on pollen chemistry, in combination with plant leaf wax biomarkers. Although the studied section was previously assigned a mid-Cretaceous age based on ostracods, this new palynological evidence combined with magnetostratigraphy rather indicates a Paleogene age. Volcanic intrusives and extrusives crosscut the lacustrine to alluvial Cenozoic Nangqian strata, providing a minimum age constraint at ca. 37 Ma. In the context of a proto-Tibetan Plateau established early in the Cenozoic, the abundance of high-altitude bisaccates from the Nangqian section is of particular interest. It largely predates the spread of high-altitude elements to the North in Central Asia from 36 Ma, and their diversification after the 34 Ma Eocene–Oligocene transition cooling. These observations are in line with a growing body of evidence that parts of the Tibetan Plateau had attained high elevations similar to modern conditions soon after the India-Asia collision. The outward growth from this elevated central part of the Tibetan Plateau, with associated effects on the monsoons, is envisioned to have had major effects on dispersal and speciation of the Pinophyta across Asia during the Paleogene.
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https://hal-insu.archives-ouvertes.fr/insu-01878571
Contributor : Isabelle Dubigeon <>
Submitted on : Friday, September 21, 2018 - 11:19:48 AM
Last modification on : Tuesday, January 28, 2020 - 1:36:50 AM

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  • HAL Id : insu-01878571, version 1

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Natasha Barbolini, Guillaume Dupont-Nivet, Niels Meijer, Et Al.. MULTIPLE PALAEOECOLOGICAL PROXIES CONSTRAIN THE INTERPLAY BETWEEN TIBETAN PLATEAU GROWTH, THE PROTO-MONSOONS AND FLORAL DISPERSAL DURING THE EARLY INDIA-ASIA COLLISION. 10 th EUROPEAN PALAEOBOTANY & PALYNOLOGY CONFERENCE, Aug 2018, Dublin, Ireland. pp.126. ⟨insu-01878571⟩

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