山东牟平—乳山金成矿带南段煌斑岩成因机制研究 |
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关键词:lamprophyre zircon U-Pb dating geochemistry petrogenesis Muping–Rushan fault belt |
基金项目:国家重点研发计划(编号: 2017YFC0601506);山东省重点研发计划(编号: 2017CXGC1606);山东省地质勘查项目(编号: 鲁勘字201529号) |
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摘要: |
Formation Mechanism of Lamprophyres in Southeast Part of the Muping–Rushan Gold Metallogenic Belt in Shandong Province |
There are lots of lamprophyre veins in the southeastern part of the Muping–Rushan gold metallogenic belt, which mainly comprise kersantite and fraidronite. In this paper, using geochemical and zircon LA-ICP-MS U-Pb dating methods, the authors selected the surface lamprophyres from Fengjia Town to do the study. The dating result shows that the petrogenetic age is (150.6±6.1) Ma, suggesting late Jurassic magmatic activity. Geochemical results show that the lamprophyres contain SiO2 47.15%~58.91%, and belong to alkaline rock series. The rocks are basaltic andesite, belonging to the Pacific type (sodium) volcanic rocks. The rocks are characterized by enrichment of large ion lithophile elements (LILE) and light rare earth elements (LREE), and relative depletion of high field strength elements (HFSE). The crystallization of biotite, amphibole, clinopyroxene and a small amount of plagioclase occurred during the rock-forming process. Lamprophyres were formed during the subduction of the paleo-Pacific plate, resulted from mantle-derived magma intrusion, and was contaminated by crustal source materials. |
ZHU De-cheng,HAN Zhen-yu,TIAN Rui-cong,ZHANG Ye-zhi,YANG Zhen-yi,ZHANG Wen.2019.Formation Mechanism of Lamprophyres in Southeast Part of the Muping–Rushan Gold Metallogenic Belt in Shandong Province[J].Acta Geoscientica Sinica,40(2):249-258. |
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