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金牛火山岩盆地重磁异常综合分析及找矿预测

于炳飞 罗恒 李端 徐江嬿 陈松林 李连支

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. doi: 10.19509/j.cnki.dzkq.2021.0029
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. doi: 10.19509/j.cnki.dzkq.2021.0029
Yu Bingfei, Luo Heng, Li Duan, Xu Jiangyan, Chen Songlin, Li Lianzhi. Comprehensive analysis of gravity and magnetic anomalies in Jinniu volcanic basin for prediction of ore deposits[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 282-299. doi: 10.19509/j.cnki.dzkq.2021.0029
Citation: Yu Bingfei, Luo Heng, Li Duan, Xu Jiangyan, Chen Songlin, Li Lianzhi. Comprehensive analysis of gravity and magnetic anomalies in Jinniu volcanic basin for prediction of ore deposits[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 282-299. doi: 10.19509/j.cnki.dzkq.2021.0029

金牛火山岩盆地重磁异常综合分析及找矿预测

doi: 10.19509/j.cnki.dzkq.2021.0029
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

详细信息
    作者简介:

    于炳飞(1982—), 男, 教授级高级工程师, 主要从事地质勘查和遥感地质相关工作。E-mail: 94119809@qq.com

    通讯作者:

    李端(1988—), 男, 讲师, 主要从事重磁场建模和重磁资料处理及反演研究工作。E-mail: liduan@cug.edu.cn

  • 中图分类号: P631.8+13

Comprehensive analysis of gravity and magnetic anomalies in Jinniu volcanic basin for prediction of ore deposits

  • 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。

     

  • 图 1  区域地质图(据文献[41]修改)

    Q.第四系;K2-R.上白垩统-新近系;K1.下白垩统;T2-J2.中三叠统-中侏罗统;D3-T1.上泥盆统-下三叠统;Z-S.震旦系-志留系;P1.前震旦系;γ.花岗岩;γπ.花岗斑岩;γδ.花岗闪长岩;γδπ.花岗闪长斑岩;Qη.石英二长岩;Qηδ.石英二长闪长岩;Qηoπ.石英二长闪长玢岩;δo.石英闪长岩;δou.石英闪长玢岩;δ.闪长岩; β.玄武岩; 1.背斜; 2.倒转背斜; 3.向斜; 4.倒转向斜; 5.压性断裂; 6.压扭性断裂; 7.断裂; 8.复合断裂; 9.铁矿床; 10.铜矿床; 11.铁铜矿床; 12.铜铁矿床; 13.金铜矿床; 14.铜钼矿床; 15.钨钼矿床; 16.铅锌银矿床; 17.铜钨钼矿床; 18.地质界线; 19.不整合线; 20.岩相界线; 21.省界; 22.工作区范围; 23.湖泊

    Figure 1.  Regional geological map

    图 2  区域重磁资料(据文献[42]修改)

    a.航磁异常图;b.区域布格重力异常图

    Figure 2.  Regional gravity and magnetic data

    图 3  多尺度信号分解示意图

    Figure 3.  Multiscale decomposition

    图 4  利用多次匹配滤波方法分离的盖层与基底重、磁异常响应

    Figure 4.  Gravity and magnetic anomalies of overlying strata and basement separated by matched filtering method

    图 5  小波多尺度和经验模态分解结果对数功率谱曲线及场源等效深度估计结果

    Figure 5.  Logarithmic power spectrum of decomposition results by wavelet and empirical mode methods, and corresponding estimated depths of source

    图 6  小波多尺度与经验模态方法分离盖层与基底重、磁异常响应

    Figure 6.  Gravity and magnetic anomalies of overlying strata and basement separated by wavelet and empirical mode methods

    图 7  基底重磁异常分区

    Figure 7.  Subareas of basement gravity and magnetic anomalies

    图 8  重磁异常线性信号提取结果与推测断裂对应关系

    Figure 8.  Comparison of the linear signals obtained from gravity and magnetic anomalies and the presumed faults(black dotted line)

    图 9  重磁异常导数与推测断裂对映关系

    Figure 9.  Comparison of the linear signals and the derivatives of gravity and magnetic anomalies

    图 10  水平一阶导数识别断裂倾向理论模型试验

    Figure 10.  Model test for presuming inclination of fault by horizontal first derivation

    图 11  基底界面深度(a)和断裂倾向及切割深度推断(b)(黑色实线为基岩面,虚线为推测断裂)

    Figure 11.  Interfacial depth of basement(a) and presumed inclination and depth of faults(b)

    图 12  推测金牛火山岩盆地南缘边界(a)和金牛火山岩盆地南缘边界与航磁异常导数信息对比(b, c)

    Figure 12.  Presumed southern boundary of Jinniu Volcanic Basin(a) and this information reflected in aeromagnetic data

    图 13  推断火山机构(黑色虚线)与重磁异常导数比照图

    Figure 13.  Volcanic structures presumed by gravity and magnetic anomalies

    图 14  推断隐伏岩体与重磁异常导数比照图

    Figure 14.  Buried rocks presumed by gravity and magnetic anomalies

    图 15  重磁约束反演流程图

    Figure 15.  Constraint inversion of gravity and magnetic

    图 16  研究区三维物性分布

    Figure 16.  Property distribution in three dimensions

    图 17  约束参量

    Figure 17.  Constraint parameters

    图 18  剖面基基底重磁异常数据

    Figure 18.  Gravity and magnetic anomalies of basement in profiles

    图 19  剖面基底重磁异常约束反演结果

    Figure 19.  Inversion results of basement gravity and magnetic anomalies

    图 20  金牛火山岩盆地岩浆岩与铁矿床关系示意图

    Figure 20.  Relation between magnetic rocks and iron deposits in Jinniu volcanic basin

    图 21  剖面物性分布对比

    Figure 21.  Comparison of property distribution in profiles

    图 22  找矿远景区与基底重力响应三维反演结果对照图

    Figure 22.  Comparing inversion results of basement gravity anomalies and prospect areas

    图 23  找矿远景区与基底磁响应三维反演结果对照图

    Figure 23.  Comparing inversion results of basement magnetic anomalies and prospect areas

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