现代地质2023，Vol.37Issue(6)：1467-1481,15.DOI:10.19657/j.geoscience.1000-8527.2023.001
闽西南地区天池塘花岗闪长岩地质年代学和地球化学特征:对区域成矿作用的指示
Geochronological and Geochemical Characteristics of the Tianchitang Granodiorite in Southwestern Fujian Province:Indications for the Regional Metallogeny
摘要
Abstract
Granodiorite,emplaced at the transition of Early to Late Cretaceous,is the most important Cu-poly-metallic metallogenic intrusion in southwestern Fujian province.The Tianchitang granodiorite,located in the transition zone between the Cretaceous Zijinshan volcanic basin and the Late Paleozoic SW Fujian depression,presents a Cu-Fe skarn affinity at the outer contact zone.LA-ICP-MS magmatic zircon U-Pb dating of the grano-diorite has been conducted to understand the regional magmatic mineralization,yielding weighted average 206Pb/238U ages of(100.7±1.0)Ma and(99.6±0.7)Ma.The result indicate that the granodiorite was emplaced early Late Cretaceous.Petrogeochemistry shows the intrusion is metaluminous-peraluminous and high-K calc-al-kaline.The rocks are enriched in LILEs(Rb,Th,Zr and Hf)and depleted in HFSEs(Nb,Ta,Sr,Ti and P)with a weak negative Eu anomaly.The comparison with ore-forming intrusions in the Zijinshan orefield indi-cates that all of these intrusions were simultaneously formed in an extensional tectonic setting,and were the products of mixing of the granitul magma by partial melting of crustal material and mantle-derived mafic magma modified/influenced by subduction components.The ca.100 Ma granodiorite could resultsin different forms of mineralization in various locations.Therefore,it is a critical factor for the mineralization and prospecting of Cu-polymetallic deposits in southwestern Fujian province.关键词
花岗闪长岩/地质年代学/地球化学/成矿作用/闽西南Key words
granodiorite/geochronology/geochemistry/mineralization/southwestern Fujian分类
天文与地球科学引用本文复制引用
周延,范飞鹏,康丛轩,赵希林,肖凡,徐敏成,沈莽庭,朱意萍..闽西南地区天池塘花岗闪长岩地质年代学和地球化学特征:对区域成矿作用的指示[J].现代地质,2023,37(6):1467-1481,15.基金项目
中国地质调查局项目"华东地区钨锡钴等矿产地质调查"(DD20221688). （DD20221688）
