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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
Source PublicationGeological Journal
Volume53Issue:S1Pages:282-292
Subtype期刊论文
AbstractJianzha 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.
KeywordEast Asian Summer Monsoon Jianzha Basin Late Miocene Magnetostratigraphy Northeast Tibetplateau
DOI10.1002/gj.3047
Indexed BySCI
Project Number41772167 ; 41572164 ; 41140028 ; 40872114 ; 40599420 ; SKLLQG1601 ; 310827152014
Language英语
Funding OrganizationNational 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
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5304
Collection古环境研究室
Corresponding AuthorFu, Chaofeng
Affiliation1.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
Recommended Citation
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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