现代地质Issue(3)：461-471,11.
新疆阿尔泰南缘克因布拉克铜锌矿区黑云母二长花岗岩地球化学特征及意义
Geochemical Characteristics and Its Significance of Biotite Monzogranite in the Keyinbulake Copper-Zinc Deposit at the Southern Margin of Altay,Xinjiang
摘要
Abstract
Granites at the southern margin of Altay,Xinjiang crop out widely in the Keyinbulake copper-zinc deposit,including monzogranite,moyite,biotite granite and tonalite,where ore bodies occur in the exocontact zones between Permian monzogranite and the Upper Silurian-Lower Devonian Kangbutiebao Formation.The monzogranite has two lithofacies of two-mica monzogranite and biotite monzogranite under the microscope.The biotite monzogranites are characterized by enrichment of silica,total alkali,low Na/K value,and metalumi-nous-prealuminous.Trace elements show characteristics of noticeable positive anomaly of Rb,Th,K,Ce,Nd, Tb and negative anomaly of Ba,Nb,Sr,Ti.The REE patterns show richness of LREE,moderate total REE contents and Eu negative anomaly.The characteristics indicate that the biotite monzogranites are high K-low Ca-metaluminous-peraluminous S-type granites.These rocks have near-zero or negative εNd (t)values and high Sr isotopic compositions,with corresponding to Nd model ages of 1.145 to 1.194 Ga.The granites were probably formed by melting of the middle Proterozoic biotite-bearing metamorphic sandstone or orthometamorphite and limited mantle material,with residual of plagioclase in the melting source.Geochemical characteristics showed favorable mineralization potentiality of monzogranite.The deposit was formed in post-collision extension setting, and metallogenesis is related to the hydrothermal from monzogranite magma.关键词
黑云母二长花岗岩/地球化学/克因布拉克/阿尔泰南缘/新疆Key words
biotite monzogranite/geochemistry/Keyinbulake/southern margin of Altay/Xinjiang分类
天文与地球科学引用本文复制引用
张志欣,柴凤梅,王丽芬,刘锋,耿新霞..新疆阿尔泰南缘克因布拉克铜锌矿区黑云母二长花岗岩地球化学特征及意义[J].现代地质,2014,(3):461-471,11.基金项目
国家科技支撑计划项目（2011BAB06B03-02）；国土资源部公益性行业科研专项经费项目（200911007-06）。 （）
