Tectonothermal evolution of the High Himalayan crystalline sequence, Langtang Valley, northern Nepal

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Authors:Inger, S.; Harris, N. B. W.
Author Affiliations:Primary:
Open Univ., Dep. Earth Sci., Milton Keynes, United Kingdom
Volume Title:Metamorphic styles in young and ancient orogenic belts
Volume Authors:Pattison, David R. M., editor; Ghent, E. D.; Gordon, T. M.
Source:Journal of Metamorphic Geology, 10(3), p.439-452; Metamorphic styles in young and ancient orogenic belts, Calgary, AB, Canada, Aug., 1990, edited by David R. M. Pattison, E. D. Ghent and T. M. Gordon. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0263-4929
Publication Date:1992
Note:In English. 55 refs.; illus. incl. 16 anal., 3 tables, geol. sketch map
Summary:The apparent inversion of metamorphic isograds in the High Himalayan sequence (a 15 km-thick pile of metasediments) exposed in the Langtang area reflects a polyphase metamorphic history, rather than a transient inverted geotherm. A mechanically coherent section of the crust, metamorphosed under Barrovian conditions, was thrust over lower grade units. A second heating event overprinted the upper part of the thrust sheet, resulting in sillimanite-zone conditions and anatexis of metapelites. The cause of the selective heating for the second event is problematic, but may be due to normal fault movement which caused blanketing of metapelites of high heat productivity with low-grade sediments of low thermal conductivity. [R.M.F.P.]
Subjects:IGCP; Isograds; Metamorphic rocks; Metamorphism; Metapelite; Metasedimentary rocks; P-T conditions; Petrology; Polymetamorphism; Asia; Himalayas; Indian Peninsula; Nepal; Evolution; Langtang Valley; Northern Nepal
Abstract Numbers:92M/4945
93M/4963
Record ID:1992021553
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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