| 论界牌峪地区“陀状”角砾岩成因及找矿意义 |
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| 引用本文： | 熊先孝.论界牌峪地区“陀状”角砾岩成因及找矿意义[J].岩石矿物学杂志,1996,15(3):228-234. |
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| 作者姓名： | 熊先孝 |
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| 作者单位： | 化工部化学矿产地质研究院 |
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| 摘 要： | 湖南石门界牌峪地区存在大量的所谓“陀状”角砾岩，它们互不相连，外观圆形，有的聚集成群或者呈完全孤立的山包。角砾岩地表多为椭圆状和等轴状，与围岩多呈刺穿状接触。通过地质学、岩石学和地球化学等方面研究，认为该区“陀状”角砾岩是一种由热泉气体及部分物质在封闭还原条件下产生急剧爆发所形成的特殊的角砾岩群。它们是一种极好的容矿控矿体，具有重要的找矿意义
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| 关 键 词： | “陀状”角砾岩 容矿 控矿体 界牌峪地区 |
The Genesis and Ore-Prospecting Significance of the Top-like Breccias in Jiepaiyu Area, Hunan Province |
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| Abstract: | In Jiepaiyu area, Shimen County, Hunan Province, there exist a number of top-like breccias, which occur either in groups or as isolated ones, constitute steep ridges or hills and usually take elliptical or isometrical forms at surface and conical or cylindrical forms branching upward in profile, with the branches exhibiting stock, dike or irregular forms.On the basis of formation characteristics of top-like breccias, it is believed that these toplike breccias are of hot spring origin. Silicalites in the top-like breccias are most probably silica sinters deposited from hot spring water. Trace elements in breccias are similar to those in sedi-
ments from modern hot springs. A rock-forming model for top-like breccias of hot spring type is proposed in the paper: circulating, migrating in strata and heated by the deep thermal flow system, the percolating meteoric water might extract ore elements and mineralizing agents from the strata, producing ore-forming fluid. when this fluid ascended along faults, explosive breccia and karst breccia were formed as a result of drastic explosions of hot spring gases and related substances under the sealed and reduced conditions.Various breccias may yield large-sized uranium deposits, gold deposits, polymetallic deposits and realgar deposits. The largest realgar-orpiment deposit ever discovered in China occurs in these breccias. The top-like breccias may serve as excellent ore-hosting and ore-controlling geological bodies and hence have important ore-prospecting significance. |
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| Keywords: | top-like breccia cre-control host body Jiepaiyu area |
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