GENESIS AND PROSPECTING POTENTIAL OF THE CAILONG PLUTON IN NORTHEASTERN QUSHUI COUNTY, TIBET
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摘要: 才隆岩体位于冈底斯-念青唐古拉板片南缘，邻近雅鲁藏布江结合带.通过对岩性样品的岩相学、稀土及微量元素的分析，结果显示：岩体可分为边缘相、过渡相和中间相；成因类型为I型花岗岩；成岩岩浆可能为下地壳底部或壳幔边界的偏基性岩浆与下地壳局部熔融形成的酸性岩浆发生过混合的岩浆；产于大陆弧构造环境；含较多如黑云母和角闪石的含水矿物，高硅富钙低碱，富Cl贫F，Ag、Cu、Mo和Sn中至强的富集等成矿有利条件，加上在岩体近东西向破碎带中见铅锌矿化，表明具形成中温热液矿床的潜力.Abstract: The Cailong pluton is located in the southern rim of the Gangdise-Nyainqentanglha slab, near the Yarlung Zangbo junction. With analysis on the petrography, REE and trace element of samples, it is revealed that the pluton falls into marginal phase, transitional phase and intermediate phase. Being genetically I-type granite, the rock-forming magma of the pluton might have resulted from the mixture of basic magma at the bottom of the lower crust or crust-mantle boundary and acidic magma of the lower crust formed by partial melting. Formed in continental arc environment, there were favorable conditions for mineralization such as the hydrous minerals of biotite and hornblende, with high-silicon, enriched calcium and low-alkali, rich Cl and poor F, medium to strong enrichment of Ag, Cu, Mo and Sn. The Pb and Zn mineralization in E-W-trending fracture zone shows that the pluton has the potential of forming mesothermal deposit.
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Key words:
- Cailong pluton /
- geochemical characteristics /
- granite genesis /
- continental arc /
- prospecting potential /
- Tibet
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