• 责任者：Peng Huijuan (Chengdu University of Technology ; Chengdu 610059 ; China) ; Wang Xiongwu
• 刊名：Mineral Deposits
• 出版年：2011
• 卷期：30(2)
• 关键词：铜矿 ; copper ores ; 多金属矿 ; polymetallic ores ; 石英 ; quartz ; 长石族 ; feldspar group ; 西藏 ; Tibet
• 页码：p.249-265
• 图表：13 illus., 2 tables, 45 refs.
• 分类号：1001
• issnNo：ISSN0258-7106
• isbnNo：CN11-1965/P

Quartz and feldspar phenocrysts of igneous rocks in the Jiama Cu-polymetallic deposits were studied by cathodoluminescence and minor and trace element profiling. The results verify the suitability of quartz and feldspar phenocrysts as recorders of magmatic evolution, magma mixing and recharge events. Owing to the first mixing with mafic magma, resorption surfaces appeared around the core of quartz phenocrysts. And then, the quartz experienced stable growth conditions, forming a steady growth zone with low CL contrasts. Gangdise orogenic belt were in an extensional condition. Under these conditions, quite a few of normal faults were formed. The pressure of the magma reservoir was reduced rapidly, and there occurred magmatic reemplacement. Owing to the sudden empty of the magma chamber, the second magma mixing occurred.