| 江西会昌岩背锡矿床地质特征及矿床类型的划分 |
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| 引用本文：.1990.Geological features and metallogenic type of the Yanbei tin deposit in Huichang county, Jiangxi province[J].Mineral Deposits,9(4):325~331 |
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| 中文摘要:江西会昌岩背锡矿是近年来发现的一个大型锡矿床。本文重点研究了与矿化有关的花岗岩的岩石学，阐述了矿床的矿化特征，划分了矿床的蚀变分带。在对比会昌岩背锡矿床与我国南方的斑岩型锡矿和云英岩型锡矿床的主要特征的基础上，将会昌岩背锡矿确定为斑岩型锡矿床。 |
| 中文关键词:岩背锡矿 矿床特征 斑岩型锡矿 江西会昌 |
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| Geological features and metallogenic type of the Yanbei tin deposit in Huichang county, Jiangxi province |
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| Abstract:The Yanbei ore deposit is a large-size tin deposit lately discovered in Huichang County, Jiangxi Province. The deposit is genetically related to the Yanbei granite body, but its ore bodies occur mainly in volcanic rocks of the exocontact zone. The Ynbei granite is exposed as a boss at the surface, and exhibits avertical petrographic change from granite porphyry downwards through medium-fine grained granite to medium-coarse grained granite. Studies of mineralogy, petrochemistry, trace elements and isotopes indicate that the granite is genetically of transformation series and geozhemically of tin specializatioa．Cassiterite is the principal ore mineral and occurs in disseminated, vein Let-disseminated and brecciated forms in the altered rocks. Tin mineralization could be divided into two main stages based on ore structure and mineral ssociations. In the deposit, five alteration petrographic zones can be recognized in upward succession: (1)K-feldspathized-albitized granite, (2)green mica-guartzgreisens, (3)topaz-quartz greisens, (4)quartz-sulfide-chlorite altered rock and (5)sericite-quartz altered rock. Orebodies are essentially hosted in the third and fourth altered zones. Finally, a comparison is made between greisens-type and porphyry-type tin deposits in South China, and oil the basis of the differences between these two types of tin deposits，the Yanbei tin deposit is classified as a deposit of porphyry type． |
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