globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116929
New early oligocene zircon U-Pb dates for the ‘Miocene’ Wenshan Basin, Yunnan, China: Biodiversity and paleoenvironment
Author: Tian Y.; Spicer R.A.; Huang J.; Zhou Z.; Su T.; Widdowson M.; Jia L.; Li S.; Wu W.; Xue L.; Luo P.; Zhang S.
Source Publication: Earth and Planetary Science Letters
ISSN: 0012821X
Publishing Year: 2021
Volume: 565
Language: 英语
keyword in Chinese: biodiversity hot spot ; paleoenvironment ; sedimentary basin ; SW China ; U-Pb dating
Keyword: Binary alloys ; Geochronology ; Lead alloys ; Sedimentology ; Uranium alloys ; Zircon ; Biodiversity hot spot ; Early Oligocene ; Miocene ; Paleoenvironments ; Paleogene ; Sedimentary basin ; Southwest China ; SW china ; U-Pb dating ; Zircon U-Pb ; Biodiversity ; biodiversity ; biostratigraphy ; fossil ; Oligocene ; paleoenvironment ; sedimentary basin ; uranium-lead dating ; zircon ; China ; Wenshan ; Yunnan
English Abstract: The 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. © 2021 Elsevier B.V.
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Affiliation: Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, China; CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Xishuangbanna, 666303, China; School of Environmental, Earth and Ecosystem Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, United Kingdom; Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China; Geology: School of Environmental Sciences, University of Hull, Hull, HU6 7RX, United Kingdom; CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650204, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing, 100029, China; Lancaster Environment Centre, Lancaster University, LA1 4YQ, Lancaster, United Kingdom

Recommended Citation:
Tian Y.,Spicer R.A.,Huang J.,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,2021-01-01,565
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