西北地质Issue(2)：11-22,12.
新疆苏海图地区火山岩地球化学特征及构造环境分析
Geochemical Characteristics and Tectonic Environment of Volcanic Rocks in Suhaitu Arear,Xinjiang
摘要
Abstract
Native copper mineralization has been found in volcanic rocks of Suhaitu formation, with a feature of transition from tholeiite basalts to calc-alkaline basalts.Geochemistry shows that the volcanic rocks have lower TiO2 content(less than 1%),fewer Rare Earth Elements and high Al2 O3 content.In addition,their REE pattern is characterized by the weak enrichment of LREE.In the primitive mantle normalized trace element spider diagram,Suhaitu volcanic rocks are characterized by the enrichment of large ion lithophile elements,and deficit of the high field strength element. They have strongly negative anomalies in Nb and Ta, weakly negative anomalies in Ti,and weakly positive anomalies in P and Sm.Their Zr/Nb and Sm/Nd ratios are close to the range of MORB,the value of Th/Nb is larger than 0.1 1,while the Nb/Zr ratio is less than 0.04.All these characteristics mentioned above suggest that volcanic rocks of Suhaitu formation were typical volcanic arc rocks,their tectonic environment was continental island arc, and its magmas were generated by partial melting of the depleted mantle modified by fluids or sediments.关键词
火山岩/地球化学/构造环境/大陆岛弧/苏海图/新疆Key words
volcanic rocks/geochemistry/tectonic environment/continental island arc/Suhaitu/Xinjiang分类
天文与地球科学引用本文复制引用
王建中,钱壮志,高萍,姜超,吴亚谋..新疆苏海图地区火山岩地球化学特征及构造环境分析[J].西北地质,2014,(2):11-22,12.基金项目
长安大学中央高校基本科研业务费专项资金“造山带后碰撞伸展背景下的岩浆铜镍硫化物矿床成矿作用”(CHD2011SY014) （CHD2011SY014）
