Late Triassic Magma Mixing and Fractional Crystallization in the Qingchengzi Orefield,Eastern Liaoning Province:Regional Petrogenetic and Metallogenic Implications

作     者：Hongjing Xie Yuwang Wang Dedong Li Guochao Zhou Zhichao Zhang Hongjing Xie;Yuwang Wang;Dedong Li;Guochao Zhou;Zhichao Zhang

作者机构：Beijing Institute of Geology for Mineral ResourcesBeijing 100012China Deep Exploration Technic Center for Non-Ferrous MinesBeijing 100012China School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2021年第32卷第1期

页      面：144-157页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：This work was funded by the National Key R&D Program of China(No.2018YFC0603804) 

主　　题：Qingchengzi orefield Shuangdinggou intrusion magma mixing mafic microgranular enclave(MME) fractional crystallization 

摘      要：The Qingchengzi orefield is an important Pb-Zn-Au-Ag polymetallic orefield in NE *** Indosinian magmatism has formed the Shuangdinggou batholith and the Xinling stock,as well as dikes of quartz monzonite porphyry and *** to petrographic characteristics,the Shuangdinggou intrusion can be divided into the main suite and the central *** U-Pb dat-ing yielded crystallization ages of 215.0-220.9 Ma for these various Qingchengzi magmatic units,which are within analytical error and represent coeval *** Shuangdinggou main suite contains abundant mafic microgranular enclaves(MMEs)and shows features of magma ***,the major oxide contents of the MMEs and their quartz monzonite host show well-defined linear frac-tionation *** REE and trace element patterns of the MMEs and their host are similar,which demonstrates certain degree of geochemical homogenization between the two during magma *** Shuangdinggou main suite shares similar geochemical characteristics with typical high Ba-Sr gra-nites(Ba=1082 ppm-2051 ppm,Sr=803 ppm-886 ppm),and was likely originated from the mixing between a melt derived from partial melting of the thickened lower crust and the enriched *** central suite was likely formed by fractional crystallization of the main-suite *** Xinling in-trusion may represent a branch of the Shuangdinggou intrusion and has the same genesis as the central *** quartz monzonite porphyries geochemically mimic the Shuangdinggou main suite,and may also be an epioic facies of the Shuangdinggou *** MMEs and lamprophyres may have been derived from incomplete magma *** of the Pb-Zn and Au-Ag deposits in the Qing-chengzi orefield may have been related to the granite/quartz monzonite porphyries near the Shuangdinggou intrusion,which were formed by magma mixing and fractional crystallization.