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学科主题: 地球科学::地质学
题名: Paleomagnetic Constraints on the Middle Miocene-Early Pliocene Stratigraphy in the Xining Basin, NE Tibetan Plateau, and the Geologic Implications
作者: Yang, RS (Yang, Rongsheng)1, 2, 3; Fang, XM (Fang, Xiaomin)1, 2, 3; Meng, QQ (Meng, Qingquan)4, 5; Zan, JB (Zan, Jinbo)1, 2; Zhang, WL (Zhang, Weilin)1, 2; Deng, T (Deng, Tao)6; Yang, YB (Yang, Yibo)1, 2; Ruan, XB (Ruan, Xiaobai)1, 2, 3; Yang, LY (Yang, Liye)1, 1, 3; Li, BS (Li, Bingshuai)1, 1, 3
通讯作者: Fang, XM
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
刊名: GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
发表日期: 2017
DOI: 10.1002/2017GC006945
卷: 18, 期:11, 页:3741-3757
收录类别: SCI
合作性质: 国内
文章类型: Article
类目[WOS]: Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
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.
语种: 英语
WOS记录号: WOS:000418403800001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7947
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, Beijing, Peoples R China.
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China.
3.Univ Chinese Acad Sci, Beijing, Peoples R China.
4.Lanzhou Univ, Sch Earth Sci, Lanzhou, Gansu, Peoples R China.
5.Lanzhou Univ, Key Lab Western Chinas Mineral Resource Gansu Pro, Lanzhou, Gansu, Peoples R China.
6.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China.

Recommended Citation:
Yang, RS ,Fang, XM ,Meng, QQ ,et al. Paleomagnetic Constraints on the Middle Miocene-Early Pliocene Stratigraphy in the Xining Basin, NE Tibetan Plateau, and the Geologic Implications[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2017,18(11):3741-3757.
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