| 湖南新邵菱铁矿矿床成因探讨 |
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| 引用本文：.1984.A Discussion On The Genesis Of The Xinshao Siderite Deposit In Hunan Province[J].Mineral Deposits,3(4):85~92 |
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| A Discussion On The Genesis Of The Xinshao Siderite Deposit In Hunan Province |
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| Abstract:The genesis of the Xinshao siderite deposit, a small-sized yet rich ore deposit, remains a topic of heated argument. This dispute hinders the design of underground work and the further mineral exploration. The present paper proposes the opinion of underground flow metallogenesis. The location and shape of the ore deposit are controlled by a fault; the whole orebody occurs as a plunging syncline 500 m in length, 100-150 m in width and l.5-24 m in thickness. Several factors have contributed to the ore formation: (1) the deposit lies in an orographic environment of a big canyon; (2) the structural condition is the depression of a flat-lying "S"-shaped fold; (3) the wall rocks are made up of carbonaceous shale and carbonate rocks, which provide favorable reducing and karst conditions. Numerous facts enumerated in this paper demon-strate that iron was derived from iron-bearing minerals and rocks widespread in this area: sandstone contains 5-20% Fe, shale 5-15%, slate 5%, limestone 4%; (4) warm and humid climate (mean annual rainfall 1500 mm, evaporation capacity 1180-1595 mm, mean annual temperature 16.5℃) speeds up the weathering, dissolution and migration of rocks or minerals. Following are the observed facts indicating ore genesis: (1) the presence of relics as a result of the replacement of carbonate rocks by siderite； (2) the preservation of the bedding of the original rocks and relics and fragments of Brachiopoda fossils；(3) the karst grotto and siderite cupola in the orebody. (4) the regular increasing or decreasing variations in TFe, SiO2, Al2O3 from top to bottom; (5) the results of water quality analysis; (6) Sulfur isotope analysis; (7) the track of the flowage of iron material at the surface. |
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