MA Xuxuan
1 Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Jiangsu Donghai Continental Deep Borehole Crustal Activity National Observation and Research Station, Donghai, Jiangsu 222300, ChinaJoseph G. MEERT
3 Department of Geological Sciences, Neil Opdyke Paleomagnetic Laboratory, University of Florida, 241 Williamson Hall, Gainesville, FL 32611, USACAO Wenrong
4 Department of Geological Sciences and Engineering, University of Nevada, Reno, MS-172, 1664 N. Virginia St., Reno, NV 89557, USATIAN Zuolin
1 Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, ChinaLIU Dongliang
1 Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Jiangsu Donghai Continental Deep Borehole Crustal Activity National Observation and Research Station, Donghai, Jiangsu 222300, ChinaXIONG Fahui
1 Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, ChinaLI Haibing
1 Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Jiangsu Donghai Continental Deep Borehole Crustal Activity National Observation and Research Station, Donghai, Jiangsu 222300, ChinaProfound discussion and perceptive comments of Roberto Weinberg on the first draft are greatly appreciated. We benefited from the discussion with Zhu Zhiyong and She Yuwei. Mao Xiaohong, Xu Xiangzhen, and Shi Bin are thanked for their help in the EMPA and image scanning analysis. Xiang Hua helped us to model the factional crystallization and partial melting processes using the GeoPS v3.3 version. We are indebted to two anonymous reviewers for their constructive comments and editors for their efficient handling on our manuscript. This study was co-supported by the National Natural Science Foundation of China (Grant No. 42272267), the Research Grants of Chinese Academy of Geological Sciences (Grant No. JKYQN202309)(Grant Nos. DD20221630, DD20242126).
Magmatic periodicity is recognized in continental arcs worldwide, but the mechanism responsible for punctuated arc magmatism is controversial. Continental arcs in the Trans-Himalayan orogenic system display episodic magmatism and the most voluminous flare-up in this system was in early Eocene during the transition from subduction to collision. The close association of the flare-up with collision is intriguing. Our study employs zircon Lu-Hf and bulk rock Sr-Nd isotopes, along with mineral geochemistry, to track the melt sources of the Nymo intrusive complex and the role of mantle magma during the early Eocene flare-up of the Gangdese arc, Tibet. The Nymo intrusive complex is composed of gabbronorite, diorite, quartz diorite, and granodiorite which define an arc-related calc-alkaline suite. Zircon U-Pb ages reveal that the complex was emplaced between only minor crustal assimilation (~15%–25%) as indicated by assimilation and fractional crystallization modeling. Together with published data
MA Xuxuan, Joseph G. MEERT, CAO Wenrong, TIAN Zuolin, LIU Dongliang, XIONG Fahui, LI Haibing.2024.[J]. Acta Geologica Sinica(),98(4):878-903
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