浅成－次火山岩及其蚀变带黑云母铜金成矿示踪研究

Hepergene-subvolcanic plutons are the important source of ore-forming material and fluid of many porphyry-type and epithermal Cu (Au) ore deposits. The Cu and Au abundances and the volatile concentrations of Cl and F, and the oxygen fugacity (fO2) of the initial magma are the most key factors controlling whether the Cu, Au-containing fluid can be formed or not during the late magmatic stage. Biotite in the plutons related to the Shaxi porphyry-type Cu, Au ore deposit and Zijinshan epithermal Cu (Au) ore deposit is the most common Fe-Mg mineral; especially, the phenocryst biotite usually contains significant Cu, Au and Cl, F contents, and the Fe3+/(Fe2++Mg2+) ratio in the biotite composition indicates relatively high oxygen fugacity of the magmas. Biotite in these plutons therefore can be used as an ideal tracer mineral for Cu and Au mineralization in the hepergene-subvolcanic rocks. It is very important for us to carry out an investigation using biotite as Cu, Au mineralization tracer mineral in some Cu, Au mineralization regions like Shaxi and Zijinshan so as to better understand the deposit genesis and to guide the ore exploration.

本项目以安徽庐枞火山盆地和福建金山地区成矿、贫矿浅成－次火山侵入体及成矿侵入体钾硅质蚀变带黑云母为主要研究对象，分析研究其化学成分、微量元素、Cu 、Au、Cl、F丰群徒峋钡南喽匝跻荻却笮。髑吵桑位鹕窖医纬珊珻u、Au流体的关键制约因素和蟠渤梢颍⒔沂境煽笥肫犊笄秩胩宓谋局什畋鸷颓直曛尽