New early oligocene zircon U-Pb dates for the 'Miocene' Wenshan Basin, Yunnan, China: Biodiversity and paleoenvironment
Tian,Yimin; Spicer,Robert A.; Huang,Jian; Zhou,Zhekun; Su,Tao; Widdowson,Mike; Jia,Linbo; Li,Shihu; Wu,Wenjian; Xue,Li; Luo,Penghui; Zhang,Shitao
AbstractThe sedimentary basins of Yunnan, Southwest China, record detailed histories of Cenozoic paleoenvironmental change. They track regional tectonic and palaeobiological evolution, both of which are critically important for the development of modern floral diversity in southwestern China and throughout Asia more generally. However, to be useful, the sedimentary archives within the basins have to be placed within a well-constrained timeframe independent of biostratigraphy. Using high resolution U-Pb dating, we redefine the age of fossil-bearing strata in the Wenshan Basin. Regarded as Miocene for the last half century, these basin sediments encompass 30 +/- 2 and 32 +/- 1 Ma early Oligocene tuffaceous horizons, thus indicating a significantly greater antiquity than previously recognized. Together with other regional age revisions our result points to widespread Yunnan basin and orographic development as largely having taken place by the end Paleogene. This age revision provides an important new perspective on the preserved biotas and their evolution in Yunnan, and especially our understanding of the origin of Asian biodiversity which, regionally, had a near-modern composition by the early Oligocene. Crucially, this revised age evidences late Eocene-early Oligocene regional tectonism, pointing to the rise of eastern Tibet and the Hengduan Mountains before the growth of the Himalaya, and that Asia's high plant diversity has a Paleogene origin. (C) 2021 Elsevier B.V. All rights reserved.
Keywordbiodiversity hot spot paleoenvironment sedimentary basin SW China U-Pb dating TIBETAN PLATEAU ASIA PALEOCLIMATE CLIMATE EOCENE TECTONICS MONSOONS FOSSIL LAKE
WOS IDWOS:000649176900013
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Affiliation1.Kunming Univ Sci & Technol, Fac Land Resource Engn, Kunming 650093, Yunnan, Peoples R China
2.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Xishuangbanna 666303, Peoples R China
3.Spicer, Robert A.] Open Univ, Sch Environm Earth & Ecosyst Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England
4.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
5.Univ Hull, Geol Sch Environm Sci, Kingston Upon Hull HU6 7RX, N Humberside, England
6.Chinese Acad Sci, Kunming Inst Bot, CAS Key Lab Plant Divers & Biogeog East Asia, Kunming 650204, Yunnan, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
8.Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England
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Tian,Yimin,Spicer,Robert A.,Huang,Jian,et al. New early oligocene zircon U-Pb dates for the 'Miocene' Wenshan Basin, Yunnan, China: Biodiversity and paleoenvironment[J]. EARTH AND PLANETARY SCIENCE LETTERS,2021,565:116929.
APA Tian,Yimin.,Spicer,Robert A..,Huang,Jian.,Zhou,Zhekun.,Su,Tao.,...&Zhang,Shitao.(2021).New early oligocene zircon U-Pb dates for the 'Miocene' Wenshan Basin, Yunnan, China: Biodiversity and paleoenvironment.EARTH AND PLANETARY SCIENCE LETTERS,565,116929.
MLA Tian,Yimin,et al."New early oligocene zircon U-Pb dates for the 'Miocene' Wenshan Basin, Yunnan, China: Biodiversity and paleoenvironment".EARTH AND PLANETARY SCIENCE LETTERS 565(2021):116929.
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