| 金牛火山岩盆地重磁异常综合分析及找矿预测 |
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| 引用本文： | 于炳飞,罗恒,李端,徐江嬿,陈松林,李连支.金牛火山岩盆地重磁异常综合分析及找矿预测[J].地质科技通报,2022,41(3):282-299. |
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| 作者姓名： | 于炳飞 罗恒 李端 徐江嬿 陈松林 李连支 |
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| 基金项目： | 中国冶金地质总局中南地质调查院项目"湖北大冶金牛火山岩盆地1∶2.5万重磁调查项目"[2016]29中国冶金地质总局中南地质调查院项目"湖北大冶金牛火山岩盆地1∶2.5万重磁调查项目"[2017]2中国冶金地质总局中南地质调查院项目"湖北大冶金牛火山岩盆地1∶2.5万重磁调查项目"[2018]17湖北省地质勘查基金管理中心项目"湖北大冶金牛火山岩盆地重磁异常研究及深部找矿预测项目"[2018]17国家自然科学基金项目41904079 |
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| 摘 要： | 长江中下游是我国重要的铁、铜、金等多金属成矿带, 其南端是鄂东南矿集区, 该区作为我国重要铁铜矿产地, 集中分布了若干富铁富铜矿床; 金牛火山岩盆地处在鄂东南矿集区西南区域, 与成矿带中多个矿区的成矿条件相似, 具有铁、铜、金等多金属矿找矿潜力。但金牛火山岩盆地具有较厚的岩浆岩和沉积岩盖层, 增加了找矿工作的困难, 需要加强技术手段的应用, 提升找矿预测效果。相邻矿集区开展的以重磁数据为主的地球物理资料综合分析工作, 为研究区构造特征分析与指导找矿奠定了良好的基础, 证明利用高精度重磁数据并结合其他地球物理资料进行综合分析解释, 可提取研究区构造格架特征、隐伏岩体和物性分布等信息, 从而推断盆地及其基底构造特征并提出找矿预测。本研究针对金牛火山岩盆地虽有找矿潜力但缺乏系统研究的问题及迫切需求, 基于实测和收集的地质与地球物理资料, 开展以重磁资料为主联合大地电磁(MT)数据的综合分析解释工作, 利用重磁异常线性信号提取、重磁异常数据多尺度分析、重磁异常反演和物性界面反演、以及电阻率成像等, 估算盆地基底深度, 圈定火山机构和隐伏岩体, 推测断裂分布、盆地边界及找矿远景区, 对于该地区基础地质调查及深部找矿预测工作具有指导作用和借鉴意义。
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| 关 键 词： | 重磁资料 综合分析 构造格架 隐伏岩体 找矿预测 |
| 收稿时间： | 2021-06-03 |
Comprehensive analysis of gravity and magnetic anomalies in Jinniu volcanic basin for prediction of ore deposits |
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| Abstract: | The middle and lower reaches of the Yangtze River is an important iron, copper, gold and other polymetallic metallogenic belt in China. The southern part of the Yangtze River is the southeast Hubei ore concentration area. As an important source of iron and copper deposits in China, several iron-rich copper deposits are concentrated in this area. The Jinniu volcanic basin is located in the southeastern Hubei ore concentration area. The basin has the ore potential of iron, copper, gold and other polymetallic deposits with the similar metallogenic conditions of other mining areas in this metallogenic belt. However, the basin has a thick overlying strata of magnetic rock and sedimentary rock, which increases the difficulty of ore prospecting. Therefore, it is necessary to strengthen the application of technologies for improving the effect of ore prediction. In the adjacent ore concentration areas, the prospecting work mainly focuses on gravity and magnetic data and combined with other geophysical data for comprehensive analysis, which lays a good foundation for the study of structural characteristics and the guidance of prospecting prediction. These previous works has proved that by comprehensive analysis and interpretation of high-precision gravity and magnetic data combined with other geophysical data, the tectonic framework characteristics, buried rocks and physical property distribution of the study area can be extracted, so as to infer the tectonic characteristics of the basin and its basement and put forward prospecting prediction. For the lack of systematic research and demand for prospecting in Jinniu volcanic basin, based on measured and collected geological and geophysical data, comprehensive analysis and interpretation of gravity and magnetic data combined with MT data were carried out. The techniques of linear signal extraction, multi-scale analysis, inversion and resistivity imaging, etc., were utilized to estimate the depth of the basin basement, delineate volcanic mechanism and buried rocks, and speculate fractures, basin boundary, and some areas of prospecting prospect. The such research has the guidance or reference significance for the basic geological survey and deep ore prediction in this area. |
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