| 西藏雄村斑岩型铜金矿红柱石成因矿物学特征 |
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| 关键词:andalusite porphyry copper-gold deposit Xiongcun Tibet |
| 基金项目:自然科学基金(编号: 41172077);国家973项目(编号: 2011CB403103);青藏专项(编号: 1212010012005);西藏大型矿床成矿专属性研究(编号: 1212011221073) |
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| Genetic Mineralogy of Andalusite in Xiongcun Porphyry Copper-Gold Oredeposit, Tibet |
| There are abundant andalusites in the Xiongcun porphyry copper-gold deposit. Three major assemblages are recognized, i.e., quartz–K-feldspar-muscovite/sericite-andalusite assemblage, andalusite–quartz-sericite/
muscovite assemblage, and quartz – andalusite – sulfide veins. The mineral association, texture and composition of andalusites indicate that the andalusites are of hydrothermal type. The quartz-K-feldspar-muscovite/
sericite-andalusite assemblage in early K-silicate alteration zone was formed under the conditions of fairly high temperatures (above 550℃) and relatively low +K/+H ratios. Early K-silicate alteration was replaced by later phyllic/sericitic alteration under lower P-T and higher +K/+H conditions, and meteoric water probably entered the collapsed hydrothermal system during this period. Quartz-andalusite-sulfide veins with sericite alteration envelope occur rather rarely and are only observed within the phyllic alteration zone. This assemblage was formed under lower P-T and higher +K/+H condition. Andalusite assemblages are similar to the El Salvador porphyry copper deposit in Chile. Volcanic tuff and porphyry stock had rich Al2O3, which was favorable for the formation of andalusite. The andalusite within different assemblages helps reconstruct the P-T condition of the magmatic-hydrothermal process. |
| HUANG Yong,DING Jun,TANG Ju-xing,ZHANG Li,LANG Xing-hai.2012.Genetic Mineralogy of Andalusite in Xiongcun Porphyry Copper-Gold Oredeposit, Tibet[J].Acta Geoscientica Sinica,33(4):510-518. |
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