PETROGENESIS OF THE EARLY JURASSIC TRACHYANDESITE IN WUFENG AREA OF YANBIAN, JILIN PROVINCE
GAO Zi-yue1, JU Nan1,2, LI Jing-wei1, YANG Qun3, WANG Ke-yong3
1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100089, China; 2. Shenyang Center of China Geological Survey, Shenyang 110034, China; 3. College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract:Study on the petrology, LA-ICP-MS zircon U-Pb dating and whole rock geochemistry of the trachyandesite in Wufeng area of Yanbian, Jilin Province in Northeast China, shows that the SiO2 content is 58.33%-61.36%, K2O content 1.61%-3.28% and total alkali content 6.77%-10%, belonging to the medium potassium-high potassium calc-alkaline series. The weighted mean age of magmatic zircon 206Pb/238U is 175.52±2.7 Ma, which is consistent with the subduction time of Early Jurassic paleo-Pacific plate. The trachyandesite is characterized by relative enrichment of LILEs(K, Ba and Rb) and strongly incompatible elements (Th and U), and depletion of HFSEs (Nb, Ta and Ti), with high LREE/HREE ratio, and enriched LREEs and depleted HREEs, indicating that the magma may originate from the partial melting of mantle and its source area is metasomatized by the subducted shell source materials. From the above, it is believed that the trachyandesite was formed in the active continental margin of oceanic subduction system and was the magmatic response to the subduction of Early Jurassic paleo-Pacific plate.
高子越, 鞠楠, 李经纬, 杨群, 王可勇. 吉林延边五凤地区早侏罗世粗面安山岩岩石成因[J]. 地质与资源, 2024, 33(1): 12-23,40.
GAO Zi-yue, JU Nan, LI Jing-wei, YANG Qun, WANG Ke-yong. PETROGENESIS OF THE EARLY JURASSIC TRACHYANDESITE IN WUFENG AREA OF YANBIAN, JILIN PROVINCE. GEOLOGY AND RESOURCES, 2024, 33(1): 12-23,40.
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