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学科主题: 地球科学::地质学
题名: Magneto- and litho-stratigraphic records of the Oligocene-Early Miocene climatic changes from deep drilling in the Linxia Basin, Northeast Tibetan Plateau
作者: Wu, FL (Wu, Fuli)1; Fang, XM (Fang, Xiaomin)1, 2; Meng, QQ (Meng, Qingquan)2; Zhao, Y (Zhao, Yan)1; Tang, FJ (Tang, Fenjun)1, 3; Zhang, T (Zhang, Tao)1; Zhang, WL (Zhang, Weilin)1; Zan, JB (Zan, Jinbo)1
通讯作者: Fang, XM
关键词: CHINESE LOESS PLATEAU ; DIFFUSE-REFLECTANCE SPECTROSCOPY ; CENOZOIC TECTONIC EVOLUTION ; ASIAN MONSOON SYSTEM ; MARGIN EROSION ; XINING BASIN ; HEMATITE ; SEQUENCE ; TRANSITION ; MA
刊名: GLOBAL AND PLANETARY CHANGE
发表日期: 2017
DOI: 10.1016/j.gloplacha.2017.09.008
卷: 158, 期:0, 页:36-46
收录类别: SCI
合作性质: 国内
文章类型: Article
类目[WOS]: Geography, Physical; Geosciences, Multidisciplinary ; Physical Geography; Geology
研究领域[WOS]: Physical Geography; Geology
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.
语种: 英语
WOS记录号: WOS:000415771500004
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7952
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China.
2.Lanzhou Univ, Sch Earth Sci, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou 730000, Gansu, Peoples R China.
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.

Recommended Citation:
Wu, FL ,Fang, XM ,Meng, QQ ,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]. GLOBAL AND PLANETARY CHANGE,2017,158(0):36-46.
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