岩背花岗岩黑云母矿物化学研究及其对成矿意义的指示
MINERAL CHEMISTRY OF BIOTITE FROM YANBEI PLUTON: IMPLICATION FOR Sn-METALLOGENY
查看参考文献28篇
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文摘
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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 ℃,logfO_2为-15.5～15.7;合黄玉黑云母花岗岩的成岩温度为510 ℃～550 ℃,logfO_2为-19.2～-18.7.含黄玉花岗斑岩成岩温度、氧逸度高于舍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(fH_2O/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(fH_2O/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. |
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其他语种文摘
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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(logfO_2)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(fH_2O/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. |
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来源
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矿物岩石
,2007,27(3):49-54 【核心库】
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关键词
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岩背锡矿
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黑云母
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矿物化学
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成岩成矿
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地址
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1.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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江西理工大学, 江西, 赣州, 341000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-6872 |
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学科
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地质学 |
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基金
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国家自然科学基金
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中国科学院知识创新工程重要方向项目
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中国科学院西部之光人才培养计划
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:2931967
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