• 责任者：Wang Weiping (Graduate Department ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Tang Juxing
• 刊名：Acta Geoscientica Sinica
• 出版年：2012
• 卷期：33(4)
• 关键词：斑岩铜矿床 ; porphyry copper deposit ; 斑岩钼矿床 ; porphyry molybdenum deposit ; 黑云母 ; biotite ; 西藏 ; Tibet
• 页码：p.444-458
• 图表：6 illus., 4 tables, 45 refs.
• 分类号：1001
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

///Biotite from hornfels in the Jiama（Gyama） polymetallic copper deposit can be classified into primary biotite and hydrothermal one. Two sorts of biotite were observed by SEM and measured by EMPA. The authors calculated the chemical formula of biotite on the basis of EMPA data. Compared with things of primary biotite, more Cu was likely to be concentrated in hydrothermal biotite. The Cu content of rocks has positive correlation with Fe^2＋/（Fe^2＋＋Mg^2＋） of biotite, and negative correlation with Fe^3＋/Fe^2＋ in hydrothermal biotites, which suggests that the mineralization intensity of hornfels-type ores containing hydrothermal biotites might be judged by Fe^2＋/（Fe^2＋＋Mg^2＋） ratio of hydrothermal biotites. Nevertheless, Mo is spread in two sorts of biotite diffusely, and doesn’t have characteristics of selective occurrence.