气候变化领域集成服务门户(CCPortal): Paleomagnetic Constraints on the Middle Miocene-Early Pliocene Stratigraphy in the Xining Basin, NE Tibetan Plateau, and the Geologic Implications

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DOI	10.1002/2017GC006945
	Paleomagnetic Constraints on the Middle Miocene-Early Pliocene Stratigraphy in the Xining Basin, NE Tibetan Plateau, and the Geologic Implications
	Yang, Rongsheng; Fang, Xiaomin; Meng, Qingquan; Zan, Jinbo; Zhang, Weilin; Deng, Tao; Yang, Yibo; Ruan, Xiaobai; Yang, Liye; Li, Bingshuai
通讯作者	Fang, XM (通讯作者)
发表日期	2017
EISSN	1525-2027
起始页码	3741
结束页码	3757
卷号	18 期号:11
英文摘要	The Xining Basin lies in the transitional zone between the arid Asian interior and the East Asian monsoon region. The continuous Cenozoic sediments in the basin provide a unique archive recording the uplift of the Tibetan Plateau and its environmental effects on central Asian aridification and Asian monsoon evolution. However, sediments deposited since the middle Middle Miocene have not been precisely dated, hindering our ability to address these issues. Here we dated a 336 m-thick section containing many Late Miocene fossil mammals from the eastern basin. High-resolution paleomagnetism revealed 16 normal and 16 reversed zones that correlate well with chrons 3n to 5Ar.1r of the Geomagnetic Polarity Time Scale, constraining the section to approximate to 12.7-4.8 Ma. The changes in lithofacies from floodplain to braided river at approximate to 8.6 Ma and to thick alluvial fan at approximate to 6.3 Ma with predominantly southerly paleocurrent directions occur simultaneously with an increase in the sedimentation rates, representing two periods of rapid uplift in the eastern Qilian Shan to the north. Our results provide a robust oldest age constraint (<4.8 Ma) on the ancient Huang Shui and Yellow River terraces on the basin sediments and eolian deposits on the terraces. The presence of well-developed floodplain paleosols, shallow lake marls, and many large mammals in the lower section suggests that the monsoon climate in the late Middle Miocene to Late Miocene was more humid and stronger than that at present.
关键词	RESOLUTION MAGNETO STRATIGRAPHY EOCENE-OLIGOCENE TRANSITION LATE CENOZOIC DEFORMATION LINXIA BASIN CLIMATE-CHANGE GUIDE BASIN QAIDAM BASIN ENVIRONMENTAL-CHANGES NORTHERN-HEMISPHERE SEDIMENTARY ARCHIVE
英文关键词	uppermost Cenozoic stratigraphic sequence; Xining Basin; magnetostratigraphy; Late Miocene-Early Pliocene; eastern Qilian Shan uplift
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000418403800001
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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/258988
推荐引用方式 GB/T 7714	Yang, Rongsheng,Fang, Xiaomin,Meng, Qingquan,et al. Paleomagnetic Constraints on the Middle Miocene-Early Pliocene Stratigraphy in the Xining Basin, NE Tibetan Plateau, and the Geologic Implications[J]. 中国科学院青藏高原研究所,2017,18(11).
APA	Yang, Rongsheng.,Fang, Xiaomin.,Meng, Qingquan.,Zan, Jinbo.,Zhang, Weilin.,...&Li, Bingshuai.(2017).Paleomagnetic Constraints on the Middle Miocene-Early Pliocene Stratigraphy in the Xining Basin, NE Tibetan Plateau, and the Geologic Implications.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,18(11).
MLA	Yang, Rongsheng,et al."Paleomagnetic Constraints on the Middle Miocene-Early Pliocene Stratigraphy in the Xining Basin, NE Tibetan Plateau, and the Geologic Implications".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 18.11(2017).