中文摘要：

对岩背火山-斑岩型锡矿含黄玉黑云母花岗岩和含黄玉花岗斑岩中黑云母矿物化学研究表明，含黄玉黑云母花岗岩中的黑云母属于富铁黑云母，含黄玉花岗斑岩中的黑云母属于铁叶云母。含黄玉花岗斑岩的成岩温度为720℃-730℃，logfO2为-15.5- -15.7；含黄玉黑云母花岗岩的成岩温度为510℃-550℃，logfO2为-19.2- -18.7。含黄玉花岗斑岩成岩温度、氧逸度高于含黄玉黑云母花岗岩成岩温度和氧逸度。与含黄玉花岗斑共存热液流体log（fH2O/fHCl）^fluid值为4.29-4.99，与含黄玉黑云母花岗岩共存热液流体log（fH2O/fHCl）^fluid值为3.15-3.67。因此，相对于含黄玉黑云母花岗岩，含黄玉花岗斑岩岩浆演化过程中分异出的流体富F和Sn，即岩背含黄玉花岗斑岩岩浆演化过程分异出的原始流体以富F和Sn为特征，结合有关岩背Sn矿成矿流体的研究结果，进一步揭示出岩背Sn矿成矿流体为岩背含黄玉花岗斑岩岩浆演化过程分异出的岩浆热液，相对于含黄玉黑云母花岗岩，含黄玉花岗斑岩与锡成矿关系更密切。

英文摘要：

The characteristics of mineral chemistry of the biotite from the topaz-bearing biotite granite and the topaz-bearing granite porphyry which associated with Yanbei volcano-porphyry tin deposit were discussed in this paper. The biotite from the topaz-bearing biotite granite was annite, and that of the topaz-bearing granite porphyry is siderophyllite. The crystallization temperature and oxygen fugacity （logfOz）of the topaz-bearing granite porphyry were 720 ℃-730 ℃ and-15.5～-15.7, respectively and those of the topaz-bearing biotite granite were 510℃～550℃ and -19.2 ～- 18. 7, respectively. The temperature and oxygen fugacity of the topaz-bearing granite porphyry are higher than that of the topaz-bearing biotite granite. The value of log （fH2O/fHCl）^fluid of the fluid coexisted with the topaz-bearing granite porphyry was 4.29 4. 99,and that with the topaz-bearing biotite granite was 3.15-3.67 respectively. Therefore,relative to the topaz-bearing biotite granite, the topaz-bearing granite porphyry excreted F-rich and Sn-rich fluid. Combining above analysis with the previous results of the ore forming fluid of Yanbei tin deposit, it could be concluded that the fluid was characteristic of magmatic fluid which was separated from the magma of the topaz-bearing granite porphyry during the period of its evolution. Therefore, the topaz-bearing granite porphyry had a closer relation with tin deposit relative to the topaz-bearing biotite granite.