花岗岩与金铜及钨锡成矿的关系_张旗.pdfVIP

2010 10 29 5 October, 2010 MINERAL DEPOSITS Vol. 29 No. 5 :0258- 710 2010 05- 0729- 31 * 1 1 2 3 1 张 旗 , 金惟俊 , 王 焰 , 李承东, 王元龙 1 , 100029; 2 , 510 40; 3 , 300170 SrYb , , , , , , , , , ; , 3 , , , , , , , ; ; ; ; ; ; : P 18. 51; P 18. 41; P 18. 7; P 18. 44 :A Relationship between granitic rocks and Au- Cu- W- Sn mineralization 1 1 2 3 1 ZHANG Qi , JIN WeiJun , WANG Yan , LI ChengDong and WANG YuanLong 1 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2 Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510 40, Guangdong; China; 3 T ianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China Abstract Sr and Yb concentrations of grantitic rocks related to Au- Cu- W - Sn mineralization in the w orld are summarized in this paper. According to the classification of Sr versus Yb for granitic rocks, the authors hold that Au- Cu mineralization may be associated with adakitic type and Himalayan type granitic rocks, w hereas W- Sn mine- ralization may be related to Nanling- type granitic rocks. The crucial factors for different metallic ore de- posits hosted in granitic rocks are formation depth andf O , Consequently, Au- Cu mineralization cannot be 2 coexistent w ith W- Sn mineralization at the same time and in the same locality unless the two kinds of minera-l ization w ere superimposed on each other afterw ards. It is considered that granitic rocks and related ore deposits might have been formed by tw o independent processes: the formation of granitic rocks was controlled by heat of source rocks, whereas the formation of ore deposits was controlled by three compulsory factors, i. e. , heat, fluid and suitable metal sources. T herefore, ore mineralization is alw ays restricted in certain localities. Au- Cu- W- Sn ore deposits may not have a direct genetic connection w ith the host granitic rocks. It is probable that ore de- posits might have been fo