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DOI | 10.1016/j.palaeo.2015.04.024 |
Lithologic and rock magnetic evidence for the Mid-Miocene Climatic Optimum recorded in the sedimentary archive of the Xining Basin, NE Tibetan Plateau | |
Zan, Jinbo; Fang, Xiaomin; Yan, Maodu; Zhang, Weilin; Lu, Yin | |
通讯作者 | Fang, XM (通讯作者) |
发表日期 | 2015 |
ISSN | 0031-0182 |
EISSN | 1872-616X |
起始页码 | 6 |
结束页码 | 14 |
卷号 | 431 |
英文摘要 | Thick Cenozoic deposits in the Xining Basin provide great potential for understanding the tectonic and climatic evolution of the NE Tibetan Plateau. However, the Middle Miocene Climatic Optimum (MMCO) in this basin has not been reported up until now, due to the poor exposure of the uppermost strata covering this interval. In this study, a 194 m-deep core of flood-plain to channel-flood deposits was obtained from the Tashan flats above the Xiejia Section in the Xining Basin. Magnetostratigraphic dating of the core determines its age at ca. 18.5-13.5 Ma. Lithological and rock magnetic analyses demonstrate that the most prominent changes recorded in the present study occurred between similar to 17 and similar to 14 Ma. During this period, the sedimentary sequence mostly consists of gray-white or bluish-gray claystone and muddy siltstone, intercalated with some thin red claystone. The rock magnetic parameters show a large variability, with higher values in thin red claystone beds and lower values in gray-white or bluish-gray layers. These features demonstrate that, due to a warm and wet climate, extensive rivers had developed in the Mid-Miocene and that a reducing sedimentary environment prevailed. These favorable climatic conditions coincide with the MMCO as based on global deep-sea deposit records, indicating that this warm event exerted a major impact on regional climate change in the NE Tibetan Plateau during the Mid-Miocene. (C) 2015 Elsevier B.V. All rights reserved. |
关键词 | CHINESE LOESS PLATEAUAPATITE FISSION-TRACKTECTONIC EVOLUTIONNORTHWESTERN CHINAMARGIN EROSIONSOIL COLOR20 MAUPLIFTARIDIFICATIONTRANSITION |
英文关键词 | Xining Basin; Tibetan Plateau; Mid-Miocene; Rock magnetism; Lithologic variation |
语种 | 英语 |
WOS研究方向 | Physical Geography ; Geology ; Paleontology |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS记录号 | WOS:000356984600002 |
来源期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY |
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/258416 |
推荐引用方式 GB/T 7714 | Zan, Jinbo,Fang, Xiaomin,Yan, Maodu,et al. Lithologic and rock magnetic evidence for the Mid-Miocene Climatic Optimum recorded in the sedimentary archive of the Xining Basin, NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2015,431. |
APA | Zan, Jinbo,Fang, Xiaomin,Yan, Maodu,Zhang, Weilin,&Lu, Yin.(2015).Lithologic and rock magnetic evidence for the Mid-Miocene Climatic Optimum recorded in the sedimentary archive of the Xining Basin, NE Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,431. |
MLA | Zan, Jinbo,et al."Lithologic and rock magnetic evidence for the Mid-Miocene Climatic Optimum recorded in the sedimentary archive of the Xining Basin, NE Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 431(2015). |
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