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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

查看全文 作　　者：SHI [1]Chenglong;DING [1]Xiaozhong;ZHOU [2]Xiaodong;NIE [2]Lijun;ZHANG [1]Jibiao 高影响力作者 机构地区：[1]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;[2]Survey of Regional Geological and Mineral Resurce of Jilin Province,Changchun 130022,China高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2022年第96卷第5期,共16页高影响力期刊 基　　金：Project Grant Nos. DD20190370 and DD20221645 which derived from the China Geological Survey funded for this article。 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. 关 键 词：GRANITOIDS tectonic evolution Paleo-Asian Ocean Central Asian Orogenic belt
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