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Late Miocene topographic inversion in southwest Tibet based on integrated paleoelevation reconstructions and structural history

文献类型：期刊论文

作者Murphy, Michael A.1; Saylor, Joel E.2; Ding, Lin3,4
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2009-05-30
卷号282期号:1-4页码:1-9
关键词Himalaya syncollisional extension oxygen isotopes paleoelevation
ISSN号0012-821X
DOI10.1016/j.epsl.2009.01.006
文献子类Article
英文摘要Investigations of the deformation history of the Himalayan orogen support interpretations of rapid and striking changes in the landscape of the Tibetan Himalaya and High Himalaya. We examine this issue by integrating oxygen isotope-based paleoelevation reconstructions of the Zada basin in southwestern Tibet with information on the structural evolution of the High and Tibetan Himalaya between 79 degrees E and 84 degrees 30'E. delta(18)O(psw) values were calculated from delta(18)O(cc) values from pristine fluvial Miocene gastropod shells. Analyses comparing the most negative delta(18)O(sw) and reconstructed delta(18)O(psw) values to Delta delta(18)O(sw) versus elevation relationships based on both thermodynamic models and an empirical data set suggest a decrease in the mean watershed elevation of 1 to 1.5 km since the Late Miocene. Geologic mapping and structural data from crustal scale fault systems in the Zada region and regions to its east indicate a phase of arc-normal shortening and vertical thickening since the Middle Miocene, followed by ongoing arc-parallel extension and vertical thinning. These results suggest that regions in this part of the orogen transitioned from undergoing arc-normal shortening to arc-parallel extension in the Late Miocene, and that arc-parallel extensional structures root deeply within the Himalayan thrust wedge. When combined with data on the distribution, age, and provenance of sedimentary basins, our geologic mapping, structural data, and paleoelevation results suggest that this transition from shortening to extension was accompanied by a topographic inversion from mountains to basins in <4 m.y. These observations can be explained by a foreland propagating fault system that accommodates outward radial expansion of the Himalayan orogen. (C) 2009 Elsevier B.V. All rights reserved.
WOS关键词FOLD-THRUST BELT ; ISOTOPE-BASED PALEOALTIMETRY ; KARAKORAM FAULT SYSTEM ; INDIA-ASIA COLLISION ; SOUTHERN TIBET ; CONTINENTAL SUBDUCTION ; WESTERN NEPAL ; HIMALAYAN ARC ; SUTURE ZONE ; TECTONIC IMPLICATIONS
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000266899800001
出版者ELSEVIER SCIENCE BV
资助机构National Science Foundation(EAR-0106808 ; National Science Foundation(EAR-0106808 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; EAR 0438826) ; EAR 0438826) ; National Science Foundation(EAR-0106808 ; National Science Foundation(EAR-0106808 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; EAR 0438826) ; EAR 0438826) ; National Science Foundation(EAR-0106808 ; National Science Foundation(EAR-0106808 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; EAR 0438826) ; EAR 0438826) ; National Science Foundation(EAR-0106808 ; National Science Foundation(EAR-0106808 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; EAR 0438826) ; EAR 0438826)
源URL[http://ir.iggcas.ac.cn/handle/132A11/71371]  
专题中国科学院地质与地球物理研究所
通讯作者Murphy, Michael A.
作者单位1.Univ Houston, Houston, TX 77004 USA
2.Univ Arizona, Tucson, AZ 85721 USA
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Murphy, Michael A.,Saylor, Joel E.,Ding, Lin. Late Miocene topographic inversion in southwest Tibet based on integrated paleoelevation reconstructions and structural history[J]. EARTH AND PLANETARY SCIENCE LETTERS,2009,282(1-4):1-9.
APA Murphy, Michael A.,Saylor, Joel E.,&Ding, Lin.(2009).Late Miocene topographic inversion in southwest Tibet based on integrated paleoelevation reconstructions and structural history.EARTH AND PLANETARY SCIENCE LETTERS,282(1-4),1-9.
MLA Murphy, Michael A.,et al."Late Miocene topographic inversion in southwest Tibet based on integrated paleoelevation reconstructions and structural history".EARTH AND PLANETARY SCIENCE LETTERS 282.1-4(2009):1-9.

入库方式： OAI收割

来源：地质与地球物理研究所

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