西秦岭温泉斑岩型钼矿花岗岩类地球化学特征  

GEOCHEMICAL CHARACTERISTICS OF THE WENQUAN PORPHYRY MOLYBDENUM DEPOSIT IN WEST QINLING AREA

作　　者：韩海涛[1] 刘继顺[1] 董新[1] 周余国[1] 王国仁[2] 史建军[2] 

机构地区：[1]中南大学地学与环境工程学院,湖南长沙410083 [2]甘肃有色地质勘查局天水总队,甘肃天水741025

出　　处：《物探与化探》2008年第2期139-142,153,共5页Geophysical and Geochemical Exploration

摘　　要：温泉斑岩型钼矿床产出于印支期复式杂岩体中。围岩属富钾钙碱性岩石,经C IPW计算,岩石属正常型,在Q-A-P图解中样品均落入二长花岗岩区。通过微量元素分析,与成矿关系密切的元素为Mo、Cu、Ag、As、B i。稀土地球化学研究表明,岩石轻稀土富集,分馏程度好,铕亏损强烈。岩石属壳、幔源混浆作用的产物,提供了成矿物质来源。The Wenquan porphyry molybdenum deposit in West Qinling area occurs in Indosinian complexes, with the wall rocks being K-rich calc-alkaline rocks. CIPW calculation shows that they are of the normal type, and in Q-A-P diagram they are all plotted in the adamellite region. Trace element analyses show that Mo, Cu, Ag, As and Bi were closely related to mineralization, and REE geochem- ical studies reveal that the rocks are characterized by enrichment of LREE, good fractionation and strong Eu depletion. It is thus concluded that the rocks were products of crsut-mantle magmatic mixture and provided ore-forming materials.

关 键 词：斑岩型钼矿 稀土元素 混合作用 地球化学 

分 类 号：P631[天文地球—地质矿产勘探]