The ore-controlling structural characteristics of Yangshan gold deposit and its enlightenment for the exploration of gold deposits in Mian-Lue tectonic mélange belt, West Qinling Orogen
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摘要:
阳山金矿大地构造位置位于秦祁昆造山系秦岭弧盆系南秦岭勉略构造混杂岩带，成矿区划属秦岭成矿省南秦岭成矿带新关-阳山成矿亚带。由于矿床位于构造混杂岩带中，控矿构造复杂，给勘查工作带来了很大的困难，一度无法提交勘查报告。为了详细理清构造控矿样式，利用矿区探矿工程资料，提取大量的构造要素，利用构造统计分析及应力分析方法，结合野外现场观察，提出了全新的构造控矿模式。通过研究认为，阳山金矿位于勉略构造混杂岩带文县安昌河－观音坝逆冲断裂推覆构造体系前锋断褶带的葛条湾-草坪梁复背斜东部转折端，矿体受褶皱两翼的韧脆性断裂破碎带及其核部楔入式断层控制，总体以北东东向展布为主，平面上呈"网结状"展布，剖面上倾向既有向北，也有向南，还有近水平的。从而解决了阳山金矿的控矿构造和矿体圈连问题，对勉略构造混杂岩带中金矿勘查具有很好的借鉴意义。
Abstract:The Yangshan gold deposit in Wenxian County is located in the triangle area north of the Yangtze plate, south of the China-Korea plate, and east of the Songpan-Garze fold system, and belongs to the south belt of the West Qinling orogenic belt.Since the deposit is located in the tectonic melange belt with extremely complicated metallogenic structure, it has brought great difficulties to the exploration work of the deposit in the past, and researchers even once failed to submit an exploration report.In order to find out the style of metallogenic structure, the authors, based on the data of prospecting engineering in the mining area and a large number of structural elements, proposed a new metallogenic structure model by using structural statistical analysis and stress analysis methods combined with a large number of field observations.It is held that it is located at the eastern turning point of Getiaowan-Caopingliang complex anticline in the forward fault-fold belt of the nappe structural system of Anchanghe-Guanyinba thrust fault in Wenxian County, Mianlue tectonic mixed rock belt.The orebodies are controlled by folding wings toughening brittle fracture fault fracture zone and the wedge type, with the typical "netted" tectonic melange tectonic style characteristics, and are generally NNE-trending.The strikes of orebodies are diverse in north, south or horizontal direction.Thus, the problem of ore-control structure and orebody circle connection of the Yangshan gold deposit is solved, which provides a good reference for gold exploration in Mian-Lue tectonic melange belt.
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