| 广西原生锡矿主要类型的划分及成矿规律的初步认识 |
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| 引用本文：.1985.The major types of primary tin deposits in Guangxi and their metallogenic regularities[J].Mineral Deposits,4(1):31~38 |
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| The major types of primary tin deposits in Guangxi and their metallogenic regularities |
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| Abstract:There occurs a variety of primary tin deposits in Guangxi, which might be genetically grouped into nine types, i. e., the tin-bearing granite type, the tin-bearing pegmatite type, the tin-bearing greisen type, the tin-bearing skarn type, the cassiterite-quartz vein type, the eassiterite-sulfide type, the cassiterite-carbonate type, the c assiterite-quartz-sulfide type, and the chalcopyrite-sulfide type. Primary tin mineralization took place mainly in late Yenshanian time,
and less importantly in early Yenshanian, Caledonian and Sibu-Xuefeng epochs. Some factors are obviously responsible for mineralization in Guangxi: The regional Nanling latitudinal structural zone and the ”∈” type structure of Guangxi dominate the occurrence of tectono-magmatic zone and tin mineralization zone; the intersections of polystructural systems govern the occurrence of minor intrusive, ore fields and even ore deposits; the low-order structures flanking the major structure decide the position of ore deposits; fractures, interformational fragmentation zones and unconformities are positions where orebodies seem likely to occur. Tin ore deposits in Guangxi occur mainly in lower Proterozoic Sibao Group, Cambrian sequence and Devonian sequence. Of them, the Devonian contains some 89％of the total tin reserve in Guangxi. Tin mineralization was gradually yet undulatorily intensified from Xuefeng to Yenshanian orogenies and reached its culmination at Late Yenshanian time, with the mineralization types and mineral assemblages progressively becoming complicated and the granites getting finer in grain and lighter in color. Tin ore deposits are distributed almost invariably with granite, with only very few orebodies lying beyond several kilometers from the granite body. Tin-mineralization is likely to occur at the top of the late-stage small intrusive body, the exocontact zone of the small stock, and in the small intrusive scattered around the large complex intrusive body. The association of metallogenic elements and ore types show horizontal zoning, vertical zoning as well as ore-forming temperature zoning. |
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