西秦岭温泉斑岩型钼矿花岗岩类地球化学特征

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CIPW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、Bi。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。

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

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 geochemical 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.