| 湘中锡矿山式锑矿成矿地质条件分析 |
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| 引用本文： | 陶琰,高振敏,金景福,曾令交.湘中锡矿山式锑矿成矿地质条件分析[J].地质科学,2002,37(2):184-195. |
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| 作者姓名： | 陶琰 高振敏 金景福 曾令交 |
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| 作者单位： | 1. 中国科学院地球化学研究所矿床开放研究实验室, 贵阳, 550002;2. 成都理工学院, 成都, 610059 |
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| 基金项目： | 原地质矿产部定向科研基金 (编号 :地定 96 1 3)资助项目 |
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| 摘 要： | 湘中锡矿山式锑矿形成于晚白垩-古新世,空间上与岩脉关系密切,各锑矿床、矿化点都伴有或附近发育有煌斑岩及中-酸性岩脉群,在锑矿成矿同期地质事件中,还有周缘一些中-新生代红色盆地的形成及基性火山岩喷发,据之,提出湘中锡矿山式锑矿成矿与燕山晚期拉张构造-岩浆活化作用有关.锑矿床(点)基本上都产出于两组或两组以上断裂的交汇点附近,3组断裂的交汇部位对应于最主要的锑矿床(点).矿体具体受断裂交汇部位附近的次级短轴背斜轴部、倾伏背斜的倾伏端及其翼部被纵向陡倾角断裂构造所切穿的部位控制,是断裂导矿与背斜构造圈闭的体现.岩性组合控矿表现为易于硅化蚀变交代的砂质碳酸盐岩与隔挡层泥质岩所构成的岩性圈闭.根据包裹体均-温度和盐度测定成果,推算成矿压力为(200～300)×105Pa,成矿深度约为1 km.
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| 关 键 词： | 锡矿山式锑矿 构造—岩浆活化 构造—岩性圈闭 成矿深度 湘中 |
| 收稿时间： | 2000-12-22 |
| 修稿时间： | 2000-12-22; |
ORE-FORMING CONDITIONS OF XIKUANGSHAN-TYPE ANTIMONY DEPOSITS IN CENTRAL HUNAN |
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| Tao Yan,Gao Zhenmin,Jin Jingfu,Zeng Lingjiao.ORE-FORMING CONDITIONS OF XIKUANGSHAN-TYPE ANTIMONY DEPOSITS IN CENTRAL HUNAN[J].Chinese Journal of Geology,2002,37(2):184-195. |
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| Authors: | Tao Yan Gao Zhenmin Jin Jingfu Zeng Lingjiao |
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| Institution: | 1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;2. Chengdu University of Technology, Chengdu 610059 |
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| Abstract: | The Central Hunan is a world famous antimony metallogenic province, host a great number of antimony deposits in which Xikuangshan type is the most important one.Based on geological investigations, this paper confirmed that the metallogeny was related to tectono magmatic activation.The geological evidences and the ESR ages of Sb bearing quartz showed that metallogenetic epoch was from Late Cretaceous to Paleocene.Antimony deposits were located on the intersection of two or three faults. In general, the intersection of three faults companied with the main antimony deposit.Controlled by structure trap, ore body located in the core of the brachy anticline or pitch part of plunging anticline which was intersected by high angle longitudinal fault.The most favorable wall rock assemblages were in three layer structures in which agillaceous rocks acted as plastic beds overlain on top, clastic rocks at bottom, chemically active beds of arenaceous limestone in the middle and prone to be silicified.The ore forming pressure was (200～300)×105 Pa, the forming depth was about 0.8～1.2 km. |
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| Keywords: | The Xikuangshan type antimony deposits Tectono magmatic activation Structural lithological trap Ore forming depth Central Hunan |
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