四川石棉大渡河地区金矿带基于AMT的地质—地球物理找矿模型

doi:10.11720/wtyht.2024.1545

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摘要

四川石棉大渡河地区金矿带位于松潘—甘孜造山带南段稀有金属、贵金属和有色多金属成矿带,区内构造复杂,地形陡峻,严重制约找矿勘查的实践运用。本文总结区域成矿地质背景和条件、地球物理特征,以石棉县倮倮坪金矿为典型矿区,开展以音频大地电磁测深(AMT)为核心的地球物理深部勘查工作,圈出3个低电阻率异常体M1、M2和M3,与矿化蚀变带I号、金矿化带Ⅲ号和金铜矿体具有对应性,说明地球物理方法深部找矿具备有效性和适用性。结合地质认识和工程手段验证成果,总结典型矿区地质和地球物理找矿标志,建立适用于地区金矿带的地质—地球物理找矿模型,为地区深部找矿提供技术支撑。

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	姚文
	郭军
	孙崇波
	周洪兵
	张洪超

关键词 ：石棉, 金矿带, 地球物理, 找矿模型

Abstract：

The gold ore zone in the Daduhe area of Shimian County, Sichuan Province, is located in the rare metal-precious metal-nonferrous polymetal metallogenic belt in the southern segment of the Songpan-Ganzi orogenic belt. It exhibits complex structures and steep terrains, severely restricting prospecting and exploration. Based on the geological settings, conditions, and geophysical characteristics for regional mineralization, this study investigated the typical Luoluoping gold deposit in Shimian by conducting deep geophysical exploration centered on audio-frequency magnetotellurics (AMT). Three low-resistivity anomalies (M1, M2, and M3) were identified, corresponding to the mineralized alteration zone I, the gold mineralization zone III, and the gold-copper ore body, respectively, demonstrating the effectiveness and applicability of geophysical methods for deep prospecting. Combined with geological understanding and engineering verification, this study summarized geological and geophysical prospecting markers for the typical gold deposit, establishing the geological-geophysical prospecting model for the gold ore zone in the study area. Therefore, this study provides technical support for deep prospecting in the study area.

Key words： Shimian gold ore zone geophysics prospecting model

收稿日期: 2023-12-19 修回日期: 2024-03-02 出版日期: 2024-10-20

ZTFLH:

P631

基金资助:四川省石棉大渡河地区金多金属矿深部找矿关键技术研究项目(SDDY-Z2022017)

通讯作者: 郭军(1988-),男,2012年本科毕业于桂林理工大学,主要从事地球物理矿产勘查工作。Email:327882438@qq.com

作者简介: 姚文(1989-),男,2016年硕士毕业于成都理工大学,主要从事地球物理勘查应用与研究工作。Email:427838589@qq.com

引用本文:

姚文, 郭军, 孙崇波, 周洪兵, 张洪超. 四川石棉大渡河地区金矿带基于AMT的地质—地球物理找矿模型[J]. 物探与化探, 2024, 48(5): 1247-1257.
YAO Wen, GUO Jun, SUN Chong-Bo, ZHOU Hong-Bing, ZHANG Hong-Chao. AMT-based geological-geophysical prospecting model for the gold ore zone in the Daduhe area, Shimian County, Sichuan Province. Geophysical and Geochemical Exploration, 2024, 48(5): 1247-1257.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1545 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I5/1247

Fig.1 研究区大地构造位置

Fig.2 石棉大渡河地区地质简图
1—花岗岩;2—基性岩;3—辉绿岩;4—第四系;5—矿床(点);6—主剪切带;7—推覆带;8—逆冲带;9—走滑断层;10—糜棱岩带

Fig.3 倮倮坪典型矿区构造纲要

Fig.4 区域物性成果平面

Table 1 电性参数测定结果统计

Fig.5 矿区地形图及物探测线

Fig.6 各测线电阻率—深度反演剖面

Fig.7 AMT低阻异常体综合立体图

Fig.8 地质—低阻异常体M1立体图

Fig.9 地质—低阻异常体M2立体图

Fig.10 地质—低阻异常体M3立体图

Table 2 典型矿区找矿标志

Fig.11 石棉大渡河地区地质—地球物理找矿模型

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