地球学报2012，Vol.33Issue(4)：501-509,9.DOI:10.3975/cagsb.2012.04.10
西藏甲玛铜多金属矿二长花岗斑岩岩浆-热液过渡特征及成矿意义
Characteristics and Significance of Magmatic-Hydrothermal Transition in Jiama(Gyama) Monzonite Granite-porphyry, Tibet
摘要
Abstract
Based on basic geological data, this paper summed up the characteristics and metallogenesis of the magmatic-hydrothermal transition in the Jiama(Gyama) monzonite granite-porphyry with the help of the electron microprobe analytical data and rock geochemical data in the aspects of petrology, petrography and geochemistry. The characteristics of the magmatic-hydrothermal transition in the Jiama(Gyama) monzonite granite-porphyry is manifested as tourmalinization-sodium/calcium silicate, like pegmatite-aplite shell (pulse), "adularia-habit" K-feldspar crystals, myrmekite, miarolitic cavities, while the geochemical characteristics are expressed as the growth and decrease of Na/K and the fluctuatation of the volatiles with the separation of the ore-forming materials such as Cu, Mo, Au. The development of the magmatic-hydrothermal transition can be divided into liquid immiscibility and volatile-liquid fractionation, the former dominated the mineral fractionation in the later magma, while the latter controlled the formation of ore solution and ore-forming hydrothermal fluids, forming disseminated mineralization and stockwork mineralization respectively.关键词
二长花岗斑岩/岩浆热液过渡/成矿作用/甲玛铜多金属矿/冈底斯成矿带/西藏Key words
monzonite granite-porphyry/ magmatic hydrothermal transition/ metallogenesis/ Jiama(Gyama) Cu polymetallic deposit/ Gangdise ore belt/ Tibet分类
天文与地球科学引用本文复制引用
秦志鹏,多吉,汪雄武,刘鸿飞,周云,彭惠娟..西藏甲玛铜多金属矿二长花岗斑岩岩浆-热液过渡特征及成矿意义[J].地球学报,2012,33(4):501-509,9.基金项目
本文由国家973项目(编号:2011CB403103)、国土资源地质大调查项目(编号:1212010012005)和中央公益性行业科研专项(编号:200911007-02)联合资助. （编号:2011CB403103）
