Preservation of a Paleoproterozoic rifted margin in the Himalaya:Insight from the Ulleri-Phaplu-Melung orthogneiss

作     者：K.Larson S.Piercey J.Cottle 

作者机构：Earth Environmental and Geographical Sciences IKBSAS University of British Columbia Department of Earth Sciences Memorial University of Newfoundland Department of Earth Science University of CaliforniaSanta Barbara 

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

年 卷 期：2019年第10卷第3期

页      面：873-883页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：supported by NSERC Discovery Grants to K. Larson and S. Piercey and NSF Grant No. 1119380 to J. Cottle 

主　　题：Himalaya Geochemistry Paleogeography Rifting Geochronology 

摘      要：Orthogneiss within the Paleoproterozoic strata of Lesser Himalayan sequence across the Himalaya has been variably linked to development in a continental arc setting, Indian basement, or a continental rift.New whole rock and trace element geochemical data and U/Pb zircon geochronology indicate that the granitoid protoliths to these rocks were derived from upper crustal sources in the Paleoproterozoic and have within-plate, A-type affinities. This is consistent with their generation in a rifted margin and is compatible with paleogeographic reconstructions that indicate an open boundary for present-day northern India in the Paleoproterozoic.