A revised chronology for Tertiary sedimentation in the Sikouzi basin: Implications for the tectonic evolution of the northeastern corner of the Tibetan Plateau

IVPP-IR > 中科院古脊椎所（2000年以后）

	A revised chronology for Tertiary sedimentation in the Sikouzi basin: Implications for the tectonic evolution of the northeastern corner of the Tibetan Plateau
	Wang, Wei-tao 1; Zhang, Pei-Zhen 1; Kirby, Eric 2; Wang, Li-Hua 3; Zhang, Guang-Liang 1; Zheng, De-Wen 1; Chai, Chi-Zhang 4
	2011-06-03
发表期刊	TECTONOPHYSICS
卷号	505 期号:1-4 页码:100-114
文章类型	Article
摘要	The space-time pattern of development of high topography associated with the Tibetan Plateau remains incomplete, due in large part to sparse proxy data that allow estimates of the growth of individual mountain ranges. Here, we present the results of a stratigraphic investigation of a similar to 3100 m section of Tertiary fluviolacustrine strata in the Sikouzi basin, located at the northeastern most corner of the Tibetan Plateau. Results of magnetostratigraphic analysis, coupled with a newly discovered Miocene in-situ fossil assemblage, suggest that the section preserves a nearly complete record extending from initial basin formation at similar to 29 Myr until similar to 0.5 Myr. Sediment accumulation rates increase from relatively slow accumulation during the Oligocene-Miocene (similar to 9 cm/kyr) to rapid accumulation in the Pliocene (similar to 22 cm/kyr), apparently occurring in two sustained pulses at similar to 10.5 Ma and similar to 5 Ma, respectively. The increase in accumulation rates starting at similar to 10.5 Ma is interpreted as heralding the initial uplift of the Liupan Shan, consistent with cooling and exhumation of the range (Zheng et al., 2006). The Pliocene increase in accumulation rate is accompanied by a distinct change in lithofacies, the appearance of coarse detritus with provenance from the Madong Shan, and up section changes in bedding orientation that are interpreted as growth strata. Collectively, our data suggest that the generation of relief in the Madong Shan began at similar to 5.4 Ma. Moreover, analysis of paleomagnetic declinations from the Sikouzi section reveals a clockwise rotation of the Sikouzi basin during the time period 24-5.4 Ma, that was followed by a subsequent counterclockwise rotation (5.4-0.5 Ma). Our study suggests that activity along the Liupan Shan-Haiyuan fault system probably initiated at similar to 10.5 Ma, but that the present-day configuration of the fault system and associated ranges near the fault tip dates to Pliocene time. (C) 2011 Elsevier B.V. All rights reserved.
关键词	Sikouzi Basin Magnetostratigraphy Northeastern Tibetan Plateau Vertical-axis Rotation
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	LATE CENOZOIC DEFORMATION ; RESOLUTION MAGNETO STRATIGRAPHY ; HUI AUTONOMOUS REGION ; INDO-ASIAN COLLISION ; LOWER CRUSTAL FLOW ; QAIDAM BASIN ; SURROUNDING REGIONS ; HAIYUAN FAULT ; QILIAN SHAN ; TIANSHAN MOUNTAINS
收录类别	SCI
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000292678500008
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/7671
专题	中科院古脊椎所（2000年以后）
作者单位	1.China Earthquake Adm, State Key Lab Earthquake Dynam, Inst Geol, Beijing, Peoples R China 2.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA 3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 4.China Earthquake Adm Yinchuan, Ningxia Hui Autonomous Reg Inst Seismol, Yinchuan, Peoples R China
推荐引用方式 GB/T 7714	Wang, Wei-tao,Zhang, Pei-Zhen,Kirby, Eric,et al. A revised chronology for Tertiary sedimentation in the Sikouzi basin: Implications for the tectonic evolution of the northeastern corner of the Tibetan Plateau[J]. TECTONOPHYSICS,2011,505(1-4):100-114.
APA	Wang, Wei-tao.,Zhang, Pei-Zhen.,Kirby, Eric.,Wang, Li-Hua.,Zhang, Guang-Liang.,...&Chai, Chi-Zhang.(2011).A revised chronology for Tertiary sedimentation in the Sikouzi basin: Implications for the tectonic evolution of the northeastern corner of the Tibetan Plateau.TECTONOPHYSICS,505(1-4),100-114.
MLA	Wang, Wei-tao,et al."A revised chronology for Tertiary sedimentation in the Sikouzi basin: Implications for the tectonic evolution of the northeastern corner of the Tibetan Plateau".TECTONOPHYSICS 505.1-4(2011):100-114.