Mineralogical Characteristics and Genesis of Garnet in the Jiama (Gyama) Copper-Polymetallic Deposit of Tibet
详细信息
- 责任者：Tang Xiaoqian (Chengdu University of Technology ; Chengdu ; China) ; Wang Guozhi
- 刊名：Acta Geoscientica Sinica
- 出版年：2012
- 卷期：33(4)
- 关键词：石榴子石岩 ; garnetite ; 矿床成因 ; mineral deposit genesis ; 西藏 ; Tibet
- 页码：p.633-640
- 图表：illus., 14 tables, 1 refs.
- 分类号：1001
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
Based on previous studies, the authors used electron microprobe to analyze the garnets collected from different depths of drill holes at the mine center and the edge of the Jiama（Gyama） deposit, with a detailed comparative study of mineralogical characteristics. The results of 18 garnet points and other electron microprobe analyses show that all the garnets are of calcium series. They are composed of Ti-poor andradite and Ti-, Mg- and Mn-rich grossular. Constrained by the fluid oxygen fugacity, garnets at the mining center are mainly composed of andradite, while those on the edge of the mining area are composed of grossular. The content of the andradite decreases from the depth to the shallow part, whereas the grossular content increases.