Geochronology, Geochemistry and Sr-Nd-Hf Isotopes of Early–Middle Triassic Adakitic Plutons in Central-eastern Jilin Province, NE China: Constraints on the Non-synchronous Closure of Paleo-Asian Ocean

作     者：SHI Chenglong DING Xiaozhong ZHOU Xiaodong NIE Lijun ZHANG Jibiao SHI Chenglong;DING Xiaozhong;ZHOU Xiaodong;NIE Lijun;ZHANG Jibiao

作者机构：Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China Survey of Regional Geological and Mineral Resurce of Jilin ProvinceChangchun 130022China 

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

年 卷 期：2022年第96卷第5期

页      面：1615-1630页

核心收录：

学科分类：070904[理学-构造地质学] 070902[理学-地球化学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：Project Grant Nos. DD20190370 and DD20221645 which derived from the China Geological Survey funded for this article 

主　　题：granitoids tectonic evolution Paleo-Asian Ocean Central Asian Orogenic belt 

摘      要：The Changchun–Yanji suture zone(CYSZ) in NE China is considered as the suture between the North China Craton(NCC) and Central Asian Orogenic Belt(CAOB). The geochronology, geochemistry and Sr-NdHf isotopes of Early–Middle Triassic adakitic plutions from the CYSZ, are presented in this paper to discuss their petrogenesis and tectonic setting, as well as to constrain the timing and style of the Paleo-Asian Ocean s final closure. In Early Triassic, the Dayushan pluton(ca. 250 Ma) from western CYSZ has negative ε_(Nd)(t) values, bidirectional provenances(NCC and CAOB) of ε_(Hf)(t), which are formed in a collision tectonic setting. In contrast, in eastern CYSZ, the early Triassic samples in Liangshan(ca. 242 Ma) were high Mg~# values, positive ε_(Nd)(t), single provenances(CAOB) of ε_(Hf)(t) resulting from a subduction setting. In the Middle Triassic, the Atype granites in western CYSZ are found in previous studies representing a post-collisional extensional environment, whereas syn-collisional Lianyanfeng granites(ca. 237 Ma) in eastern CYSZ with low ISr and large scale ε_(Nd)(t) and ε_(Hf)(t) values from bidirectional provenances(NCC and CAOB), represent a collisional setting. The Paleo-Asian Ocean s occurred in a scissor-like fashion along the CYSZ during the Triassic period.