Zircon U–Pb Geochronology and Petrogenesis of Early–Midlle Permian Arc–Related Volcanic Rocks in Central Jilin: Implications for the Tectonic Evolution of the Eastern Segment of Central Asian Orogenic Belt
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In this article, we would like to congratulate Academician Li Tingdong on his 90th birthday and thank you for your concern and help all the time. This work is granted by the China Geological Survey Program (Grant No. DD20190370). We gratefully extend our appreciation Engineer Kai Zhou and Gang Sun, who helped us in the field work. The authors would like to thank the anonymous reviewers for their constructive criticism and useful comments.

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    Abstract:

    This paper presents age and geochemical data of a recently identified Late Paleozoic volcanic sequence in central Jilin Province, with aims to discuss the petrogenesis and to constrain the tectonic evolution of the Central Asian Orogenic Belt in this area. Firstly, the volcanic rocks have zircon U-Pb ages of 290–270 Ma. Secondly, they are characterized by (a) ranging in composition from the low-K tholeiite series to high-K calc-alkaline series; (b) enrichment in light rare earth elements and depletion of heavy rare earth elements, with negative Eu anomalies; and (c) negative Nb, Ta, and Ti anomalies. Finally, the volcanic rocks yield εHf(t) values of +7.1 to +17. These data suggest that the central Jilin volcanic rocks were possibly derived from predominant partial melting of a depleted lithospheric mantle that might have been modi?ed by subducted slab–derived ?uids. Combined with previous studies, the Late Paleozoic–Early Mesozoic magmatism in Central Jilin can be divided into two stages: (a) a volcanic arc stage (290–270 Ma) represented by low-K to high–K, tholeiite to calc–alkaline plutons and (b) a syn–collisional stage (260–240 Ma) represented by high-K calc–alkaline I-type granites. Furthermore, the timing and the tectonic setting of the above magmatic rocks show that the arc was probably produced by the northward subduction of the Paleo-Asian Ocean and that the final closure of the Paleo-Asian Ocean occurred prior to the Early Triassic.

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SHI Chenglong, DING Xiaozhong, LIU Yanxue, ZHOU Xiaodong, NIE Lijun.2020. Zircon U–Pb Geochronology and Petrogenesis of Early–Midlle Permian Arc–Related Volcanic Rocks in Central Jilin: Implications for the Tectonic Evolution of the Eastern Segment of Central Asian Orogenic Belt[J]. Acta Geologica Sinica(),94(4):1207-1222

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  • Received:April 05,2020
  • Revised:June 05,2020
  • Adopted:
  • Online: August 25,2020
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