【摘要】 <正> 近年来,国内外在玻璃包裹体的研究方面,取得了一些新的进展,这无疑对促进岩石学研究的发展具有积极的意义。本文拟通过对江西银山矿区玻璃包裹体的研究,探讨岩浆演化及其研究方法问题,不当之处,请予指正。据前人研究,江西银山斑岩型铜铅锌多金属矿床的岩浆活动,发生在燕山运动的早期。根据它们的岩性特征、空间关系、蚀变矿化的程度等,火山活动大致分为三个阶段。第一阶段形成了流纹质集块岩、流纹岩、石英斑岩和爆破角砾岩。第二阶段形成了英安质火山碎屑岩、英安质熔岩、英安斑岩和爆破角砾岩。第三阶段仅有安山玢岩的侵入。次火山岩中的斑晶成分以斜长石和石英为主,随着岩浆的演化,岩浆岩中石英斑晶的含量越来越少(石英斑岩内为5—15%,英安斑岩内为5—10%,安山玢岩内约为5%)。斜长石中An的含量有更多还原

【Abstract】 This paper presents a study on glass inclusions of the Yinshan Cu-Pb-Zn deposit in Dexing country, Jiangxi province. The features of magmatic inclusions in volcanic and subvolcanic rocks in the district were described and from that it is known that the cooling rate of the magma was fast. The homogenization temperature of glass inclusions in quartz in these rocks ranges from 1110° to 1210℃. Their chemical compositions were analysed by electron microprobe and the compositional points were projected on An-Ab-Or and Q-Ab-Or phase diagrams. Furthermore, the phenocryst species, the P_H2O conditions in the crystallization differentiation were discussed. It is concluded that there had been a potassium-enriching trend during differentiation of magmas and it had played an important role in the formation of the deposit.更多还原