气候变化领域集成服务门户(CCPortal): Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal

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DOI	10.1130/B31799.1
	Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal
	Roche R.S.L.; Godin L.; Crowley J.L.
发表日期	2018
ISSN	167606
起始页码	1041
结束页码	1056
卷号	130 期号:2021-05-06
英文摘要	Recent mapping in the Jajarkot klippe highlights the presence of the South Tibetan detachment in an external crystalline nappe south of the main Himalayan range and provides structural constraints on the emplacement mechanism of such nappes. The top-tothe- northeast South Tibetan detachment in the Jajarkot klippe separates lower-greenschist- to lower-amphibolite-facies metasedimentary rocks of the Greater Himalayan sequence in the footwall from weakly to nonmetamorphosed siliciclastic and carbonate rocks of the Tethyan sedimentary sequence in the hanging wall. The maximum depositional age of an arenite unit at the base of the Tethyan sedimentary sequence is constrained to the late Cambrian. The temperature of deformation increases structurally upward from ~450 °C at the base of the klippe to ~600 °C in the South Tibetan detachment and decreases sharply to 250-300 °C in its hanging wall. The existence of the South Tibetan detachment between the Greater Himalayan sequence and the Tethyan sedimentary sequence is only compatible with the onethrust tectonic model for the emplacement of Himalayan external crystalline nappes. The minimum dip-slip displacement along the South Tibetan detachment is constrained to 160-185 km in western Nepal based on the restoration of this folded structure. The lack of evidence for partial melting in the footwall of the South Tibetan detachment in the Jajarkot klippe implies that the melt-weakened middle crust did not flow as far south as the klippe or that it flowed obliquely or parallel to the orogen on both sides of the klippe. © 2017 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185031
作者单位	Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, ON K7L 3N6, Canada; Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725-1535, United States
推荐引用方式 GB/T 7714	Roche R.S.L.,Godin L.,Crowley J.L.. Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal[J],2018,130(2021-05-06).
APA	Roche R.S.L.,Godin L.,&Crowley J.L..(2018).Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal.Bulletin of the Geological Society of America,130(2021-05-06).
MLA	Roche R.S.L.,et al."Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal".Bulletin of the Geological Society of America 130.2021-05-06(2018).