| 山东平度芝坊斜长角闪岩型滑石矿床的地质特征及成因 |
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| 引用本文：.1988.Geological characteristics and origin of the Zhifang amphibolite type talc deposit in pingdu county, Shandong province[J].Mineral Deposits,7(2):73~82 |
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| 中文摘要:芝坊斜长角闪岩型滑石矿是新发现的滑石工业类型。斜长角闪岩呈侵人体状态分布于太古一元古界胶东群变质岩系中。热液沿斜长角闪岩与镁质碳酸盐岩接触部位的断裂带上侵。两种岩石均可形成滑石矿，而斜长角闪岩成矿比例偏大。从滑石矿体到斜长角闪岩分带明显，依次为滑石矿一滑石化斜长角闪岩或次滑石一斜长角闪岩。斜长角闪岩为成矿提供了SiO2，镁质碳酸盐岩为成矿提供了MgO，在热液作用下，两种岩石相互交代，原地成矿。 |
| 中文关键词:山东芝坊 滑石矿床 斜长角闪岩成因 热液交代成矿 |
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| Geological characteristics and origin of the Zhifang amphibolite type talc deposit in pingdu county, Shandong province |
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| Abstract:There exist a lot of talc ore deposits in Jiaodong region and their reserves and outputs are most prominent in China. On the basis of an investigation into the mineralization patterns of talc and magnesite, some new industrial types have been found, such as quartz schist(or quartzite)type, granite type, tremolite type and amphibolite type; among them is the large Zhifang amphibolite type talc deposit. The Zhifang talc deposit occurs in the metamorphic complex of Archeozo—
Ic-Proterozoic Jiaodong Group. Lithologically, the ore district mainly has biotite-plagioclase gneiss, magnesian marble, amphibolite and granite; the orebodies are controlled by fault structure, and their direct country rocks are magnesian marble and amphibolites, with quite a few orebodies seen in the amphiboiite. According to shapes, modes of occurrence, textures, structures and chemical composition of amphibolites, it is considered that the original rock of amphibolife is gabbro which, together with the talc deposit it contains, belongs to magmatic type. The mineralization of the amphibolite shows obvious zonation. Between the talc and the amphibolites, there is a transitional zone(composed of talcization amphibolite or sub-talc)which is from several meters to tens of meters in width. From the orebody through the transitional zone to amphibolites, there is a regular variation in SiO2 and MgO contents, being respectively 59.00—59.74％, 34.40一42.08％, 47.35—48.76％for SiO2 and 30.65—31.68％, 24.28—39.20％,5.22-9.97％for MgO. This suggests that part of SiO2 in the transitional zone migrated into the tale zone, while some MgO in the talc zone moved into the transitional zone. The amphibolite provided SiO2 whereas magnesian carbonate rocks provided MgO for ore formation. Thus, the deposit belongs to the hydro-thermal metasoinatic autochthonous one. |
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