雪峰弧形构造带西南段金矿控矿构造及成矿模式新析

    New Analysis of the Ore-controlling Structure and Gold Mineralization Model in the Southwest Section of the Xuefeng Arcuate Structural Belt

    • 摘要: 这是一篇地球科学领域的论文。雪峰弧形构造带西南段是湖南最重要的金矿成矿区带。该区新元古界青白口系冷家溪群、板溪群/高涧群和南华系是主要赋金层位。本文以研究区赋矿地层、容矿围岩、导矿构造、容矿构造为基础,从构造控矿规律及成矿模式方面进行综合研究。结果表明,该区构造控矿在金的成矿过程中起关键作用,沅陵—怀化—新晃、溆浦—洪江—靖州、安化—溆浦—通道、新化—武阳—城步四条推覆型深大断裂为主要导矿构造,控制着矿集区分布;NE向次级断裂及伴生的褶皱-冲断系统、NW向断裂、区域复背斜与轴部断层联合部位、脆-韧性剪切带和剪切裂隙及劈(片)理化带是主要容矿构造,控制着矿体最终空间定位。通过分析构造控矿规律,包括区域构造控制矿床成带成区分布、构造运动多旋迴迭加形成“三期二向”构造迭加部位富集成矿、脆-韧性构造系统控制矿体垂向分布以及特定构造部位富集成矿,建立了该区金矿复合成矿模式。

       

      Abstract: This is an essay in the field of earth science. The southwest section of the Xuefeng arc structure is the most important gold ore mineralization zone in Hunan. The Lower Paleozoic Qingbaikou Formation, including the Coldjiaxi Group, Banxi Group, Gaojian Group, and Nanhua Formation, are the main gold-bearing strata in this area. Based on the study of ore-forming strata, ore-bearing surrounding rock, ore-bearing structure, and orebody structure, the paper forms a comprehensive analysis of tectonic ore-controlling rules and ore-forming models. The results suggest that structural control plays a crucial role in the process of gold mineralization. Guanzhuang-Huaihua-Xinhuang, Xupu-Hongjiang-Jingzhou, Anhua-Xupu-Tongdao, and Xupu-Wuyang-Chengbu are the four main ore-controlling thrust faults controlling the distribution of mineralized areas. The NE-trending secondary faults and associated fold-thrust systems, NW-trending faults, regional anticlines and synclines, brittle-ductile shear zones, and shear fractures and cleavage planes are the main ore-hosting structures that control the final spatial location of the ore bodies. By analyzing the rules of structural control on mineralization, including regional structural control on the distribution of ore deposits, the enrichment of mineralization in the overlapping parts of "three stages and two directions" structural superposition, the control of brittle-ductile structural systems on the vertical distribution of ore bodies, and the enrichment of mineralization in specific structural locations, a composite gold mineralization model has been established for this area.

       

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