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Peneplain formation in southern Tibet predates the India-Asia collision and plateau uplift

文献类型：期刊论文

作者Hetzel, Ralf1; Dunkl, Istvan2; Haider, Vicky2; Strobl, Marcus1; von Eynatten, Hilmar2; Ding, Lin3,4; Frei, Dirk5
刊名GEOLOGY
出版日期2011-10-01
卷号39期号:10页码:983-986
ISSN号0091-7613
DOI10.1130/G32069.1
文献子类Article
英文摘要The uplift history of Tibet is crucial for understanding the geodynamic and paleoclimatologic evolution of Asia; however, it remains controversial whether Tibet attained its high elevation before or after India collided with Asia similar to 50 m.y. ago. Here we use thermochronologic and cosmogenic nuclide data from a large bedrock peneplain in southern Tibet to shed light on the timing of the uplift. The studied peneplain, which was carved into Cretaceous granitoids and Jurassic metasediments, is located in the northern Lhasa block at an altitude of similar to 5300 m. Thermal modeling based on (U-Th)/He ages of apatite and zircon, and apatite fission track data, indicate cooling and exhumation of the granitoids between ca. 70 and ca. 55 Ma, followed by a rapid decline in exhumation rate from similar to 300 m/m.y. to similar to 10 m/m.y. between ca. 55 and ca. 48 Ma. Since then, the peneplain has been a rather stable geomorphic feature, as indicated by low local and catchment-wide erosion rates of 6-11 m/m.y. and 11-16 m/m.y., respectively, which were derived from cosmogenic Be-10 concentrations in bedrock, grus, and stream sediment. The prolonged phase of erosion and planation that ended ca. 50 Ma removed 3-6 km of rock from the peneplain region, likely accomplished by laterally migrating rivers. The lack of equivalent sediments in the northern Lhasa block and the presence of a regional unconformity in the southern Lhasa block indicate that the rivers delivered this material to the ocean. This implies that erosion and peneplanation proceeded at low elevation until India's collision with Asia induced crustal thickening, surface uplift, and long-term preservation of the peneplain.
WOS关键词FORE-ARC BASIN ; TECTONIC EVOLUTION ; LHASA ; GEOLOGY ; EOCENE ; CHINA
WOS研究方向Geology
语种英语
WOS记录号WOS:000294818700022
出版者GEOLOGICAL SOC AMER, INC
资助机构German Research Foundation (DFG)(HE-1704/8-1 ; German Research Foundation (DFG)(HE-1704/8-1 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; HE-1704/8-2 ; HE-1704/8-2 ; 373/5-1 ; 373/5-1 ; 373/5-2) ; 373/5-2) ; German Research Foundation (DFG)(HE-1704/8-1 ; German Research Foundation (DFG)(HE-1704/8-1 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; HE-1704/8-2 ; HE-1704/8-2 ; 373/5-1 ; 373/5-1 ; 373/5-2) ; 373/5-2) ; German Research Foundation (DFG)(HE-1704/8-1 ; German Research Foundation (DFG)(HE-1704/8-1 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; HE-1704/8-2 ; HE-1704/8-2 ; 373/5-1 ; 373/5-1 ; 373/5-2) ; 373/5-2) ; German Research Foundation (DFG)(HE-1704/8-1 ; German Research Foundation (DFG)(HE-1704/8-1 ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; HE-1704/8-2 ; HE-1704/8-2 ; 373/5-1 ; 373/5-1 ; 373/5-2) ; 373/5-2)
源URL[http://ir.iggcas.ac.cn/handle/132A11/74224]  
专题中国科学院地质与地球物理研究所
通讯作者Hetzel, Ralf
作者单位1.Univ Munster, Inst Geol & Palaontol, D-48149 Munster, Germany
2.Univ Gottingen, Geowissensch Zentrum, Abt Sedimentol Umweltgeol, D-37077 Gottingen, Germany
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
5.Univ Stellenbosch, Dept Earth Sci, ZA-7602 Matieland, South Africa
推荐引用方式
GB/T 7714		 Hetzel, Ralf,Dunkl, Istvan,Haider, Vicky,et al. Peneplain formation in southern Tibet predates the India-Asia collision and plateau uplift[J]. GEOLOGY,2011,39(10):983-986.
APA Hetzel, Ralf.,Dunkl, Istvan.,Haider, Vicky.,Strobl, Marcus.,von Eynatten, Hilmar.,...&Frei, Dirk.(2011).Peneplain formation in southern Tibet predates the India-Asia collision and plateau uplift.GEOLOGY,39(10),983-986.
MLA Hetzel, Ralf,et al."Peneplain formation in southern Tibet predates the India-Asia collision and plateau uplift".GEOLOGY 39.10(2011):983-986.

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来源：地质与地球物理研究所

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