现代地质2023，Vol.37Issue(6)：1482-1494,13.DOI:10.19657/j.geoscience.1000-8527.2023.016
内蒙古扎拉格阿木铜矿床成矿岩体地质地球化学及其成矿学意义
Geological and Geochemical Characteristics of Ore-forming Granite Porphyry and Its Metallogenic Significance in the Zhalageamu Copper Deposit,Inner Mongolia
摘要
Abstract
The Zhalageamu copper deposit is located in the northeastern margin of the ancient Xilinhot Block,and is a recently discovered medium-sized hydrothermal copper deposit in the Zn-Pb-Ag metallogenic belt(western slope of the south-central Greater Khingan Range)in Inner Mongolia.Studies on its magmatic and metallogenic mechanism provides the theoretical basis for copper exploration and broadens the exploration direction.The granite porphyry is closely space-time associated with Cu mineralization of the Zhalageamu copper deposit.To clarify the formation age and source characteristics of the granite porphyry from Zhalageamu,and to address the magmatic-metallogenic relationship,the granite porphyry was collected for petrography and geochemical analysis,zircon U-Pb dating and Sr-Nd isotope analysis.The result shows that the granite porphyry from Zhalageamu is characterized by high SiO2 and Al2O3,low MgO,and enrichments in Rb,K,La,and Th and depletions in Ta,Nb,Ti,and P.All of the samples are characterized by the enrichment of LREEs relative to HREEs,and weak negative Eu anomaly.This indicates that the granite porphyry belongs to high-K calc-alkaline I-type granite.The granite porphyry has εNd(t)=2.1 to 3.3 and young Nd model age of 980-740 Ma,indicating that the primary magma of the granite porphyry is derved from the mixture of crust and mantle materials.The magmatic zircon age of the granite porphyry is 254.51±2.13 Ma,indicating that the granite porphyry and relevant Cu mineralization generated in the Late Permian.A comprehensive analysis supports that the Zhalageamu copper deposit was formed in a Late Permian volcanic arc setting,which may be closely related to the subduction of the Hegenshan oceanic Plate.关键词
扎拉格阿木铜矿床/花岗斑岩/岩石地球化学/锆石U-Pb定年/Sr-Nd同位素Key words
Zhalageamu copper deposit/granite porphyry/petrogeochemistry/zircon U-Pb dating/Sr-Nd iso-tope分类
天文与地球科学引用本文复制引用
宋彦博,王建平,沈存利,车东,杨文华,郭海蛟..内蒙古扎拉格阿木铜矿床成矿岩体地质地球化学及其成矿学意义[J].现代地质,2023,37(6):1482-1494,13.基金项目
内蒙古自治区自然资源厅项目"内蒙古北山成矿带黑鹰山-石板井地区铁铜钼多金属成矿系统研究与找矿预测"(2022-TZH03). （2022-TZH03）
