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| 黔东南锦屏-天柱地区构造控岩控金特征模拟实验及其力学分析 | |
| 引用本文： | 吴学益,卢焕章,吕古贤,王中刚,胡瑞忠,陈文一,朱笑青.黔东南锦屏-天柱地区构造控岩控金特征模拟实验及其力学分析[J].大地构造与成矿学,2006,30(3):355-368. |
| 作者姓名： | 吴学益 卢焕章 吕古贤 王中刚 胡瑞忠 陈文一 朱笑青 |
| 作者单位： | 1. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州,贵阳,550002 2. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州,贵阳,550002;魁北克大学地质系,G7H 2B1,加拿大 3. 中国地质科学院地质力学研究所,北京,100081 4. 贵州省地矿局地质科学研究所,贵州,贵阳,550004 |
| 基金项目： | 本文为中国科学院杰出基金，贵州省政府科技基金资助研究的部分成果. |
| 摘 要： | 在前人工作基础上,侧重研究石英脉型金矿床成矿的地质背景,建立了该类型金矿的成矿模式。进而开展三轴温压条件下的成岩成矿实验,构造形变特征及其与成矿物质活化、迁移、富集之间的相互关系的模拟实验。实验结果表明:(1)该区岩石、矿石在高温高压条件下,产生塑性变形(褶皱)和脆性变形(破裂);(2)在变形过程中使成矿物质活化、迁移和富集,形成顺层及穿层的含金石英脉,并在多期多次变形过程中使成矿物质叠加富集;(3)在褶皱(背斜)轴部形成富矿体。模拟实验结果与所建立的该类型金矿构造控矿和成矿模式非常相似。实验资料的力学分析表明,由轴压所产生的构造附加压力大大地提高了实际围压,从而促进了岩石流变、变形和物质的迁移,由此促进含矿流体向构造附加压力小的部位定向迁移、充填和成矿。构造附加压力是促进该区金成矿的重要动力条件。 |
| 关 键 词： | 金矿 构造控金 模拟实验 锦屏-天柱地区 贵州 |
| 文章编号： | 1001-1552(2006)03-0355-14 |
| 收稿时间： | 2005-10-19 |
| 修稿时间： | 2006-01-10 |
FEATURES OF ROCK-CONTROLLING AND GOLD ORE-CONTROLLING STRUCTURES IN THE JINGPING-TIANZHU REGION, SOUTHEASTERN GUIZHOU: SIMULATION EXPERIMENT AND MECHANICAL ANALYSES |
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| WU Xueyi,LU Huanzhang,LU Guxian,WANG Zhonggang,HU Ruizhong,CHEN Wenyi,ZHU Xiaoqing.FEATURES OF ROCK-CONTROLLING AND GOLD ORE-CONTROLLING STRUCTURES IN THE JINGPING-TIANZHU REGION, SOUTHEASTERN GUIZHOU: SIMULATION EXPERIMENT AND MECHANICAL ANALYSES[J].Geotectonica et Metallogenia,2006,30(3):355-368. | |
| Authors: | WU Xueyi LU Huanzhang LU Guxian WANG Zhonggang HU Ruizhong CHEN Wenyi ZHU Xiaoqing |
| Institution: | 1. Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, GZ 550002, China ; 2. Department of Earth Sciences, University of Quebec, GT H 2B1, Canada ; 3. Institute of Geomechanics, CAGS, Beijing 100081, China; 4. Guizhou Institution of Geology, Guizhou Bureau of Geology and Mineral Resources, Guiyang, GZ 550004, China |
| Abstract: | This paper was formulated based on the previous researches. The geological background and quart-vein type gold deposits occur widespread in the Jingping-Tianzhu region, Southeastern Guizhou, here the ore-controlling structures of gold mineralization in the studied region were emphasized and a genetic model was established for these quartz-vein type gold deposits. Moreover, ore-forming simulating experiments were carried out, and the results show that: 1) Ductile deformation (fold) and brittle deformation (fault) took place under high-temperature and high-pressure conditions; 2) Ore-forming materials were activated, transported and enriched during deformation, and finally concordant and discordant gold-bearing quartz veins were formed. Multiple deformation during the simulation experiments help the ore-forming materials to be concentrated; 3) Formation of enriched orebodies in the axles of complex anticlines was finally resulted. The experimental results are consistent with the genetic model proposed for gold deposits in the studied region. Through geomechanical analysis of the simulation experiments, the authors discovered that the axis pressure (b1) can produce tectonic hydrostatic overpressure to enhance the enclosure pressure, and to promote rock deformation, materials migration and deposition as well as metallogenesis of mineralizing fluid at locations that show little tectonic overpressure. The experiments also show that the tectonic overpressure is an important condition for gold metallogenesis in the study area. |
| Keywords: | gold mineralization structural control simulation experiment Jingping-Tianzhu region Guizhou |
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