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DOI	10.1016/j.gloplacha.2019.03.002
	New paleomagnetic constraints for Platybelodon and Hipparion faunas in the Linxia Basin and their ecological environmental implications
	Zhang Weilin; Appel, Erwin; Wang Jiuyi; Fang Xiaomin; Zan Jinbo; Yang Yibo; Miao Yunfa; Yan Xiaoli
通讯作者	Zhang, WL (通讯作者)
发表日期	2019
ISSN	0921-8181
EISSN	1872-6364
起始页码	71
结束页码	83
卷号	176
英文摘要	The Linxia Basin in northwestern China lies topographically at the northeastern margin of the Tibetan Plateau and climatically at the western margin of the East Asian monsoon region, and bears abundant mammalian fossils with environmental significance on central Asian aridification and east Asian monsoon evolution. However, these mammals have not been precisely dated, hindering our ability to address the ecologic environment changes associated with the evolution of the Asian monsoon and multiple uplifts of the Tibetan Plateau. We present a detailed paleomagnetic study of a sedimentary sequence from the Laogou section in the Linxia Basin containing many mammalian fossils with ages ranging between middle and late Miocene. The 203 m thick section revealed 11 normal and 10 reversed zones that correlate well with chrons 3An to 5An of the Geomagnetic Polarity Time Scale, constraining its age to similar to 12.56-6.0 Ma, and suggesting that the middle Miocene Platybelodon fauna existed at about 11.5 Ma and the late Miocene Hipparion fauna occurred at about 6.4 Ma. These ages, combined with other magnetostratigraphic results from the whole basin, show that these two major mammal faunas lived during 12.5-11.1 Ma and 11.5-6.3 Ma in the Linxia Basin. The presence of well-developed floodplain paleosols, the color change of the fluviolacustrine sediments and the transition of large bodied mammals suggest that strong climatic and environmental changes happened in the Linxia Basin during late - middle Miocene, in the form of a transition from the warm and humid forest to the warm and subarid steppe at about 11.1 Ma.
关键词	NORTHEASTERN TIBETAN PLATEAU MIDDLE MIOCENE MA PROBOSCIDEA SEQUENCE HEZHENG GANSU
英文关键词	Paleomagnetism; Fluviolacustrine sediment; Fossil mammals; Ecological environment; Linxia Basin
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000465364600006
来源期刊	GLOBAL AND PLANETARY CHANGE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259582
推荐引用方式 GB/T 7714	Zhang Weilin,Appel, Erwin,Wang Jiuyi,et al. New paleomagnetic constraints for Platybelodon and Hipparion faunas in the Linxia Basin and their ecological environmental implications[J]. 中国科学院青藏高原研究所,2019,176.
APA	Zhang Weilin.,Appel, Erwin.,Wang Jiuyi.,Fang Xiaomin.,Zan Jinbo.,...&Yan Xiaoli.(2019).New paleomagnetic constraints for Platybelodon and Hipparion faunas in the Linxia Basin and their ecological environmental implications.GLOBAL AND PLANETARY CHANGE,176.
MLA	Zhang Weilin,et al."New paleomagnetic constraints for Platybelodon and Hipparion faunas in the Linxia Basin and their ecological environmental implications".GLOBAL AND PLANETARY CHANGE 176(2019).