Vestiges of the Kerguelen Mantle Plume in Southern Tibet:Evidence from 123-117 Ma Magmatism in the Dingri Area of the Central Tethys Himalaya

作     者：YAN Songtao WU Qingsong LI Hu DAI Xuejian ZHU Lidong WANG Jie XIN Chongyang YAN Songtao;WU Qingsong;LI Hu;DAI Xuejian;ZHU Lidong;WANG Jie;XIN Chongyang

作者机构：Civil-Military Integration Center of China Geological SurveyChina Geological SurveyChengdu 610036China Institute of Sedimentary GeologyChengdu University of TechnologyChengdu 610059China College of Earth ScienceChengdu University of TechnologyChengdu 610059China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2023年第97卷第4期

页      面：1163-1180页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：supported by the Geological Survey Project of China Geological Survey(Grant No.DD20211547) the Basic Survey Project of Command Center of Natural Resources Comprehensive Survey(Grant No.ZD20220508) 

主　　题：geochronology mafic-intermediate dikes Kerguelen mantle plume central Tethys Himalaya East Gondwana 

摘      要：The widely distributed Early Cretaceous magmatism in the Tethys Himalaya(TH)of southern Tibet is related to the Kerguelen mantle *** magmatic activity products are distributed in the eastern TH,where the active age is earlier than the peak ages of the Kerguelen mantle *** study investigated magmatic activity of the Dingri area in the central TH which was coeval with the Kerguelen mantle *** intrusion in the Dingri area contains diabases and *** zircon age of diabase is 123±1 Ma,and that of monzonite is 117±1 *** and Sr-Nd isotopic analyses show that the mafic-intermediate dikes were formed in an intraplate extensional *** diabase is derived from the enriched lithospheric mantle and monzonite is derived from partial melting of the lower crust,with both magmatic evolutions being contaminated by crustal *** characteristics are similar to those of the Rajmahal-Sylhet basalt,a typical Kerguelen mantle plume *** discovery of the Dingri mafic-intermediate dikes of the central TH suggests that the TH and Rajmahal-Sylhet Traps formed a continuous mantle plume overflow magmatic belt which was a product of the continuous eruption of the Kerguelen mantle plume.