Paleozoic Multi-Stage Magmatic Events Related to Proto-Tethys and Paleo-Tethys Evolution:Insights from Intrusive Rocks in the Eastern Altyn Orogen,NW China

作     者：Jiyong Li Yanqing Xia Xilong Zhang Haoyuan Jiang Tianzhu Lei Yongchao Wang Yanhong Liu Shanpin Liu Xiaobao Zhang Jiyong Li;Yanqing Xia;Xilong Zhang;Haoyuan Jiang;Tianzhu Lei;Yongchao Wang;Yanhong Liu;Shanpin Liu;Xiaobao Zhang

作者机构：Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Key Laboratory of Petroleum ResourcesGansu ProvinceLanzhou730000China University of Chinese Academy of SciencesBeijing100049China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2024年第35卷第4期

页      面：1130-1148页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 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 Opening Fund of Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes(No.Y840041117) the National Natural Science Foundation of China(No.42102199) 

主　　题：Proto-Tethys Paleo-Tethys Altyn Orogen multi-stage magmatic events magnetic cores 

摘      要：Abundant mafic-felsic intrusions distributed in the Altyn Orogen record orogenic histories related to Proto-Tethys and Paleo-Tethys *** U-Pb dating of the intrusive rocks in the eastern Altyn Orogen identifies at least three major tectono-magmatic episodes,yielding ages of∼426,∼376–373 and∼269–254 *** first two emplacement episodes correspond to the post-collisional magmatism in the Altyn ***∼426 Ma granitoids possess adakitic characteristics coupled with enriched isotopes,suggesting that they originated from partial melting of thickened lower continental crust induced by upwelling asthenospheric mantle after slab break-off of the South Altyn Ocean ***,the∼376–373 Ma mafic-intermediate rocks and coeval granitoids represent a large thermal event that involved mantle melting with induced new juvenile lower continental crust melting in a post-collisional extensional ***,the∼254 Ma diabase dykes intruded into the∼269 Ma granitoids,which were related to the widespread Late Paleozoic magmatism resulting from Paleo-Tethys Ocean ***-collisional magmatism in the Altyn Orogen significantly enhances understanding of the tectono-magmatic evolution in the northern Tibetan *** penetrative influence of Paleo-Tethys Ocean subduction was more extensive than previously thought.