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Late Miocene magnetostratigraphy of Jianzha Basin in thenortheastern margin of the Tibetan Plateau and changes in theEast Asian summer monsoon
Fu, CF(Fu, Chaofeng)1,2; Qiang,XK(Qiang,Xiaoke)2; Xu,XW(Xu,Xinwen)3; Xi, JJ(Xi,Jianjian)1; Zuo,J(Zuo,Jun)1; An,ZS(An, Zhisheng)2; Fu, Chaofeng
2017-11
发表期刊Geological Journal
卷号53期号:S1页码:282-292
文章类型期刊论文
摘要Jianzha Basin is located in the northeastern Tibetan Plateau (NETP) and contains a thick sequence of Cenozoic sediments that are an archive of information about the growth of the Tibetan Plateau and the evolution of the arid environment of the interior of Asia. Here, we present magnetostratigraphic and palaeoenvironmental records from a 361‐m‐thick sequence of Late Cenozoic eolian Red Clay and intercalated fluviolacustrine deposits in the Jianzha Basin. The magnetostratigraphic results show that the sediments have recorded a continuous geomagnetic polarity sequence from C5r.3r to C3r, spanning the interval from 11.8 to 5.8 Ma in the Late Miocene. There are two intervals of rapidly fluctuating sedimentation rates between ~10 and ~6 Ma, which we interpret as a response to a series of uplifts and expansions to the north and to the east in the NETP. The fluctuations in Rb/Sr ratio and magnetic susceptibility before ~8.57 Ma reflect intensified East Asian summer monsoon (EASM) precipitation which resulted from the growth of the NETP. From ~8.57 to ~7.21 Ma, the EASM was impacted by global cooling and ice build‐up in the Northern Hemisphere in addition to the uplift of the Tibetan Plateau (TP) in the Late Miocene. From ~8.57 to ~7.21 Ma, there is a lack of coherency between the fluctuations in MS and Rb/Sr ratio; however, subsequently, there is significant coherency between the Rb/Sr ratio and the deep‐sea oxygen isotope record present. This suggests that from ~8.57 Ma, the eolian Red Clay sediments in the Jianzha Basin were significantly affected by the addition of dust derived from the deforming and uplifting areas of the TP.
关键词East Asian Summer Monsoon Jianzha Basin Late Miocene Magnetostratigraphy Northeast Tibetplateau
DOI10.1002/gj.3047
收录类别SCI
所属项目编号41772167 ; 41572164 ; 41140028 ; 40872114 ; 40599420 ; SKLLQG1601 ; 310827152014
语种英语
项目资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; StateKey Laboratory of Loess and QuaternaryGeology ; StateKey Laboratory of Loess and QuaternaryGeology ; Central University ResearchFoundation, Chang'an University ; Central University ResearchFoundation, Chang'an University
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5304
专题古环境研究室
通讯作者Fu, Chaofeng
作者单位1.The School of Earth Science and Resources,Chang'an University, Xi'an, Shaanxi, China
2.State Key Laboratory of Loess andQuaternary Geology, Institute of Earth andEnvironment, CAS, Xi'an, Shaanxi, China
3.College of Urban and Environmental Science,Northwest University, Xi'an, Shaanxi, China
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GB/T 7714
Fu, CF,Qiang,XK,Xu,XW,et al. Late Miocene magnetostratigraphy of Jianzha Basin in thenortheastern margin of the Tibetan Plateau and changes in theEast Asian summer monsoon[J]. Geological Journal,2017,53(S1):282-292.
APA Fu, CF.,Qiang,XK.,Xu,XW.,Xi, JJ.,Zuo,J.,...&Fu, Chaofeng.(2017).Late Miocene magnetostratigraphy of Jianzha Basin in thenortheastern margin of the Tibetan Plateau and changes in theEast Asian summer monsoon.Geological Journal,53(S1),282-292.
MLA Fu, CF,et al."Late Miocene magnetostratigraphy of Jianzha Basin in thenortheastern margin of the Tibetan Plateau and changes in theEast Asian summer monsoon".Geological Journal 53.S1(2017):282-292.
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