| 广东省新榕锰矿地质特征及成因探讨 |
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| 引用本文：.2001.Geological Characteristics and Genesis of theⅪnrongr Mangranese Deposit, Guangdong Province[J].Mineral Deposits,20(3):243~250 |
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| 基金项目:原地矿部定向基金项目“粤西罗定盆地南缘锰多金属及金银矿床类型、形成条件及成矿预测研究”和九五攻关项目“广宁-罗定-阳舂地区金、银、铜、铅、锌成矿地质条件及靶区优选研究” |
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| 中文摘要:新榕锰矿是广东省重要的锰矿床，主矿体产于地下岩溶空洞内，矿石中伴生银的平均含量达100×10-6以上。锰矿石中含有少量的脆银矿、溴角银矿、含锑银黝铜矿、银金矿、单斜绿铜锌矿、黄铁矿、磁黄铁矿及重品石等矿物。据各类岩石、矿石的矿物成分，以及成矿元素、稀土元素地球化学特征等方面研究，认为Fe、Mn成矿物质主要来源于元占宇云开群和泥盆系桂头组中的富铁锰质岩层（锰铝榴石片岩、含锰千枚岩），部分来源于矿区北部断裂带中的热液硫化物，伴生元素Ag、Pb、Zn等也来源于矿区北部断裂带的热液多金属硫化物。有机质（微生物）可能参与了成矿物质的风化淋滤、迁移、沉淀富集等成矿作用。地下岩溶空洞是最有利的成矿场所。锰矿的成矿期为新生代。矿床成因类型属迁积-岩溶堆积型锰矿。 |
| 中文关键词:地质特征 成因 新榕锰矿 广东 |
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| Geological Characteristics and Genesis of theⅪnrongr Mangranese Deposit, Guangdong Province |
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| Abstract:The Xinrong deposit is a well-known manganese deposit in Guangdong Province. Its ore is of top-quality. There exist such accompanying elements as Ag, Pb and Zn in the ore. The silver content of ore is higher than 100×10-6 on average. The aim of studying its geological characteristics and genetic type is to serve mineral prospecting. The main orebody of the Xinrong manganese deposit is located in the underground karst cave , between Devonian Guitou and Qiziqiao Formations. Its shape is controlled by the underground karst cave. The secondary orebodies lie in the fault belt. The underground karst cave see ms to be the most favorable location for manganese mineralization. By such means as microscopic observation, chemical analysis, X-ray diffraction, and electron microprobe analysis, minerals like stephanite, bromargyrite, Ag-Sb-tetrahedrite, electrum, rosasite, pyrite, pyrrhotite and barite are discovered for the first time in the deposit, which are small grains among or between Fe-Mn minerals. According to the content of metallogenic elements and geochemical characteristics of REE in rocks and ores, the authors have reached the conclusion that Fe and Mn ore materials came mainly from manganiferous terranes (spessartine schist and manganiferous phyllite) of Proterozoic Yunkai Group and Devonian Guitou Formation, and subordinately from hydrothermal sulphide mineralized zone in the north of the mining area, and that the source of accompanying elements like Ag, Pb and Zn is the hydrothermal sulphide mineralized zone. The organic matter ( microorganism) may affect weathering, leaching, migration, precipitation and enrichment of ore-forming materials. The metallogenetic epoch is Cenozoic. The Xinrong manganese deposit is genetically of migration-karst accumulation type . |
| keywords:Geological characteristics, genesis, Xinrong manganese deposit, Guangdong Province |
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