| Citation: | Yunhai Zhu, Yuanming Pan, Kexin Zhang. Discovery of Jinning Cycle Magmatism in Eastern Part of Eastern Kunlun Orogenic Belt and Its Significance. Journal of Earth Science, 2000, 11(3): 328-333.
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From the isotopic dating study of gneissic granodiorite, the authors discovered magmatism of the Jinning cycle. Intrusive rocks were formed in the Neoproterozoic, whose Pb-Pb ages range from (913±4) Ma to (1 011±4) Ma and U-Pb concordia age is (703±15) Ma. The tectonic settings of the rocks are volcanic arc or syn-collision. After the formation of the intrusive rocks, these rocks also experienced reconstruction of Caledonian metamorphism. Based on the Ar-Ar dating of metamorphic mineral of muscovite, the metamorphic time is determined to range from (386.8±0.8) Ma to (389.44±3.70) Ma.
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