| 湖北徐家山层状锑矿床地质特征简介 |
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| 引用本文：.1988.Geological characteristics of the Xujiashan stratified antimony deposit in Hubei province[J].Mineral Deposits,7(2):49~54 |
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| 中文摘要:徐家山锑矿产于震旦纪地层中，矿体产出受地层控制，具多层特征。主要矿体型态呈似层、豆荚状，与地层产状一致。矿石物质成分简单。次要矿体呈囊状、脉状，但均与顺层主矿体相连，且均局限于含矿层中。徐家山锑矿属沉积-改造型锑矿床。 |
| 中文关键词:震旦系 层状锑矿 沉积-改造成因 湖北徐家山 |
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| Geological characteristics of the Xujiashan stratified antimony deposit in Hubei province |
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| Abstract:The Xujiashan stratified antimony deposit occurs in the Sinian sediments on the Damushan brachyanticline of southeastern Hubei and is apparently controlled by stratigraphic horizon. Orebodies take stratoid and lensoid forms, with their dip and strike consistent with the attitude of the wall rocks. Mineral and chemical composition of ores are quite simple ores and wall rocks contain approximately the same trace elements as common carbonate rocks; relict sedimentary structure is observed. All these unequivocally point to a sedimentary origin for this deposit. A few cross veined orebodies are also controlled by stratigraphic horizon and are connected with stratified and nested orebodies. With the increasing distance from the stratified or nested orebodies, the amount of stibnite in veined orebodies gets lower and lower. This suggests that the veined orebodies were formed through hydrothermal transformation, and the stratified orebodies served as the antimony source for these orebodies. The wall rock alteration is mainly solidification, which is rather weak in the stratified orebody, but is quite intense in veined and nested orebodies. The Xujiashan antimony deposit was formed in early epoch．During the long geological history, it experienced repeated structural activities, which resulted in the widespread recrystallization of stibnite as well as the plastic deformation and mechanical fracturing of the orebodies. In addition, the antimonydeposit was transformed by thermal groundwater. All these factors have caused the Xujiashan antimony deposit to assume features of the hydrothermal deposit belonging to sedimentary-transformed type. |
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