气候变化领域集成服务门户(CCPortal): Magneto- and litho-stratigraphic records of the Oligocene-Early Miocene climatic changes from deep drilling in the Linxia Basin, Northeast Tibetan Plateau

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DOI	10.1016/j.gloplacha.2017.09.008
	Magneto- and litho-stratigraphic records of the Oligocene-Early Miocene climatic changes from deep drilling in the Linxia Basin, Northeast Tibetan Plateau
	Wu, Fuli; Fang, Xiaomin; Meng, Qingquan; Zhao, Yan; Tang, Fenjun; Zhang, Tao; Zhang, Weilin; Zan, Jinbo
通讯作者	Fang, XM (通讯作者)
发表日期	2017
ISSN	0921-8181
EISSN	1872-6364
起始页码	36
结束页码	46
卷号	158
英文摘要	The East Asian monsoon is generally regarded to have initiated at the transition from the Late Oligocene to the Early Miocene. However, little is known about this process because of a lack of continuous strata across the boundary between the Late Oligocene and the Early Miocene in Asia. Based on previous drilling (core HZ-1) in the Miocene sediments in the southern Linxia Basin in NW China, we drilled a new 620 m core (HZ-2) into the Late Oligocene strata and obtained 206 m of continuous new core. The detailed paleomagnetism of the new core reveals eleven pairs of normal and reversed polarity zones that can be readily correlated with chrons 6Bn-9n of the geomagnetic polarity time scale (GPTS), define an age interval of 21.6-26.5 Ma and indicate continuity from the Late Oligocene to Early Miocene. The core is characterized by the remarkable occurrence of brownish-red paleosols of luvic cambisols (brown to luvic drab soils) above reddish-brown floodplain siltstones and mud stones, which suggest that the East Asian monsoon likely began by 26.5 Ma. In contrast to the siltstone and mudstone of the Late Oligocene strata, the Miocene strata begin with a thick fine sandstone bed, which marks sudden increases in erosion and loading that most likely reflect a response to tectonic uplift. The hematite content and redness index records of the core further demonstrate that the monsoonal climate in the Late Oligocene to Early Miocene in this area was mainly controlled by global temperature trends and events.
关键词	CENOZOIC TECTONIC EVOLUTION ASIAN MONSOON SYSTEM XINING BASIN HEMATITE SEQUENCE CHINA MA ARIDIFICATION DEFORMATION TRANSITION
英文关键词	Oligocene/Miocene boundary; Paleomagnetism; Hematite and redness records; Early monsoon history; 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:000415771500004
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/258973
推荐引用方式 GB/T 7714	Wu, Fuli,Fang, Xiaomin,Meng, Qingquan,et al. Magneto- and litho-stratigraphic records of the Oligocene-Early Miocene climatic changes from deep drilling in the Linxia Basin, Northeast Tibetan Plateau[J]. 中国科学院青藏高原研究所,2017,158.
APA	Wu, Fuli.,Fang, Xiaomin.,Meng, Qingquan.,Zhao, Yan.,Tang, Fenjun.,...&Zan, Jinbo.(2017).Magneto- and litho-stratigraphic records of the Oligocene-Early Miocene climatic changes from deep drilling in the Linxia Basin, Northeast Tibetan Plateau.GLOBAL AND PLANETARY CHANGE,158.
MLA	Wu, Fuli,et al."Magneto- and litho-stratigraphic records of the Oligocene-Early Miocene climatic changes from deep drilling in the Linxia Basin, Northeast Tibetan Plateau".GLOBAL AND PLANETARY CHANGE 158(2017).