DOI: 10.1016/j.palaeo.2015.04.024
论文题名: Lithologic and rock magnetic evidence for the Mid-Miocene climatic optimum recorded in the sedimentary archive of the Xining Basin, NE Tibetan Plateau
作者: Zan J. ; Fang X. ; Yan M. ; Zhang W. ; Lu Y.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 431 起始页码: 6
结束页码: 14
语种: 英语
英文关键词: Lithologic variation
; Mid-Miocene
; Rock magnetism
; Tibetan Plateau
; Xining Basin
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 ~. 17 and ~. 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. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68907
Appears in Collections: 过去全球变化的重建
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作者单位: CAS Center for Excellence in Tibetan Plateau Earth Sciences, Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Zan J.,Fang X.,Yan M.,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]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,431