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Geochronology and Geochemistry of Wangjiadashan Quartz Syenite Porphyry in Suizao Area of Hubei Province in the tongbai-Dabie orogenic Belt

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Journal of Earth Science 2023年第3期34卷 790-805页

作者： Pan-Pan Niu Shao-Yong Jiang State Key Laboratory of Geological Processes and Mineral Resources School of Earth ResourcesChina University of GeosciencesWuhan 430074China Key Laboratory of Geological Survey and Evaluation of Ministry of Education China University of GeosciencesWuhan 430074China Collaborative Innovation Center for Exploration of Strategic Mineral Resources China University of GeosciencesWuhan 430074China

The Wangjiadashan area in Suizhou-Zaoyang region of Hubei Province in the tongbai-Dabie orogenic belt hosts important copper-gold deposits and contains a large number of quartz syenite porphyry dykes,occurring mostly along the NEE-trend *** this study,we used LA-ICP-MS zircon U-Pb dating method and obtained an age of 143.6±1.4 Ma,which represents the emplacement of these quartz syenite porphyry dykes was at the Yanshanian,but it was slightly earlier than the previously reported ages(139-135 Ma)for granites widespreading in Suizao *** geochemical data of the Wangjiadashan quartz syenite porphyry show high K_(2)O,CaO,Na_(2)O and Al_(2)O_(3)contents but extremely low MgO contents(0.01 wt.%-0.46 wt.%).The geochemical characteristics indicate that these quartz syenite porphyry dykes belong to the typical C-type adakite and were possibly formed in the post-collisional ***-isotopic(Sr-Nd-Pb-Hf)analyses indicate that these quartz syenite porphyry dykes were originated from crust without distinct mantle materials *** is suggested that the Wangjiadashan quartz syenite porphyry was generated from partial melting of the thickened lower continental crust,and garnet but no plagioclase was left as residual *** with the widespread granites of the tongbai area,the Wangjiadashan quartz syenite porphyry formed earlier and derived from more juvenile and K-rich lower crust,while they all belong to intensive magmatism concentrated during the Early Cretaceous epoch in the tongbai area.

关键词： quartz syenite porphyry zircon U-Pb dating geochemistry Sr-Nd-Pb-Hf isotopes petrogenesis Wangjiadashan tongbai orogen

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