The P-T-t-D evolution of the Mahabharat,east-central Nepal:The out-of-sequence development of the Himalaya

作     者：Kyle P.Larson Sudip Shrestha Mathieu Soret Matthijs Smit Kyle P.Larson;Sudip Shrestha;Mathieu Soret;Matthijs Smit

作者机构：Department of EarthEnvironmental and Geographic SciencesUniversity of British Columbia Okanagan3247 University WayKelownaBC V1V 1V7Canada Department of EarthOcean and Atmospheric SciencesUniversity of British Columbia Vancouver2020-2207 Main MallVancouverBC V6T 1Z4Canada 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2022年第13卷第2期

页      面：372-382页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 070901[理学-矿物学、岩石学、矿床学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：supported by an NSERC Discovery Grant and Accelerator Supplement Canadian Foundation for Innovation John Evans Leadership Fund award to K.Larson Stipend and research support for S.Shrestha was provided by an NSERC Postgraduate Scholarship a UBC Okanagan Fipke Scholar Award 

主　　题：Himalaya Metamorphism Kinematics Lu-Hf Geochronology Nepal 

摘      要：A garnet-bearing schist from the southernmost such exposure along the Himalaya in east central Nepal records prograde metamorphism at 32.4±0.3 *** equilibria modelling,combined with Ti-in-biotite and quartz caxis thermometry,outline a tight-to-hairpin pressure-temperature(P-T)path extending from~515℃ and 5.5 kbar to peak conditions at~575℃ and 7 kbar followed by deformation during the retrograde phase at 480-515℃ and 6-7 *** new geochronology data place an upper bound on the evolution of metamorphism and deformation in the frontal-most part of the Himalaya,which lasted until 17.5 Ma,as indicated by previously published ^(40)Ar/^(39)Ar *** P-T-time data from this part of the Himalaya,as well as that from more hinterlandward portions of the orogen,outline a progressive,stepwise,commonly out-of-sequence *** data from along the orogen indicates that this evolution is not a local phenomenon,but instead characterizes the tectonics of this system as a whole.