河南内黄—浚县一带重磁异常与深部磁铁矿靶区预测研究

doi:10.11720/wtyht.2019.0134

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河南内黄—浚县一带位于太古宙基底隆起区,且分布有较好的重、磁异常,具备寻找沉积变质型磁铁矿床的有利条件。然而20世纪70年代以来,受制于浅部找矿认识的局限性,一直未能取得找矿突破。笔者以深部磁铁矿找矿靶区为目标,通过中心识别技术(解析信号振幅ASM)、边缘识别技术(NVDR-THDR)获得了研究区隐伏磁性体的平面位置(中心及边界),利用欧拉反褶积获得了研究区隐伏磁性体的埋深信息,利用相关系数分析了该区重磁异常的同源性特征;结合已知钻孔对研究区重点磁异常进行了2.5D拟合反演,确定了隐伏磁性体的规模及空间展布特征,研究结果表明主要磁异常对应的隐伏磁性体埋深在500~1 200 m,且深部含矿性均好于浅部,深部找矿潜力较大。综合地质矿产条件,预测了瓦岗—榆涧、南张保等2个磁铁矿深部找矿靶区,建议作为后续开展深部找矿的重点方向,以尽快实现该区的深部找矿突破。

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关键词 ：河南内黄—浚县, 重磁异常, 磁铁矿, 深部找矿靶区

Abstract：

The Neihuang-Xunxian area in Henan Province is located in the Archaean basement uplift area, and has good gravity and magnetic anomalies. It has favorable conditions in the search for sedimentary metamorphic magnetite deposits. However, since the 1970s, due to the limitations of shallow prospecting knowledge, no breakthrough has been made in prospecting. Aimed at the target area of deep magnetite prospecting, the authors detected the plane position (center and boundary) of the concealed magnets in the study area by central recognition technology (analytical signal amplitude ASM) and edge recognition technology (NVDR-THDR), obtained the burial information of the concealed magnets in the study area by Euler deconvolution, and analyzed the homologous characteristics of gravity and magnetic anomalies in the study area by correlation coefficient. Combined with known boreholes, 2.5D fitting inversion of key magnetic anomalies in the study area was carried out, and the scale and spatial distribution characteristics of the concealed magnets were determined. The results show that the buried depth of the concealed magnets corresponding to the main magnetic anomalies is 500~1 200 m, and the ore-bearing property in the deep part is better than that in the shallow part, so the prospecting potential in the deep part is great. On the basis of comprehensive geological and mineral conditions, two deep prospecting target areas of Wagang-Yujian and Nanzhangbao magnetite ores were delineated. It is suggested that they should be the key directions in further deep prospecting with the purpose of achieving a breakthrough in deep prospecting in this area as soon as possible.

Key words： Neihuang-Xunxian area of Henan Province gravity and magnetic anomalies magnetite deep prospecting target area

收稿日期: 2019-03-13 出版日期: 2019-11-28

P631

基金资助:国家重点基础研究发展计划项目“典型覆盖区航空地球物理技术示范与处理解释软件平台开发”之课题“航空地球物理数据综合处理解释方法研究及软件开发”(2017YFC0602202);河南省2008年度地质勘查基金项目(豫财[2009]56号-13)

作者简介: 宋豪(1986-),男,长安大学硕士研究生,工程师,从事重、磁勘探及电法勘探工作。Email:545752853@qq.com

引用本文:

宋豪, 张义蜜, 王万银. 河南内黄—浚县一带重磁异常与深部磁铁矿靶区预测研究[J]. 物探与化探, 2019, 43(6): 1191-1204.
Hao SONG, Yi-Mi ZHANG, Wan-Yin WANG. The research on the prediction of gravity and magnetic anomalies and deep magnetite target areas in the Neihuang-Xunxian area of Henan Province. Geophysical and Geochemical Exploration, 2019, 43(6): 1191-1204.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0134 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I6/1191

Fig.1 研究区大地构造位置(据河南省区域地质志)

Fig.2 研究区基岩地质
1—白垩系;2—平顶山组;3—上石盒子组、下石盒子组;4—山西组、太原组;5—本溪组;6—马家沟组;7—三山子组、铁仙沟组及白龙庙组;8—奥陶系未分;9—张夏组、朱砂洞组、辛集组;10—馒头组;11—寒武系未分;12—太古宇;13—实测及推测地质界线;14—实测及推测不整合接触地质界线;15—实测及推测正断层;16—实测及推测逆断层;17—实测及推测性质不明断层;18—研究区范围

Table 1 研究区地层磁性统计

Table 2 研究区地层密度统计

Fig.3 研究区化极磁异常(a)和剩余磁异常平面(b)

Table 3 研究区主要磁异常特征

Fig.4 研究区布格重力异常(a)和剩余重力异常平面(b)

Fig.5 研究区化极磁异常解析信号振幅(ASM)异常

Fig.6 研究区化极磁异常归一化总水平导数垂向导数(NVDR-THDR)

Fig.7 欧拉反褶积计算磁源深度

Table 4 重点磁异常磁源反演深度统计

Table 5 验证钻孔深度与反演磁源深度对比

Fig.8 研究区重力异常与磁异常相关系数
a—布格重力异常垂向一阶导数与化极磁异常相关系数;b—布格重力异常垂向一阶导数与剩余磁异常相关系数

Table 6 隐伏磁性体相关系数分析

Fig.9 研究区化极磁异常平面及定量解释剖面分布

Fig.10 CK1剖面定量反演解释

Table 7 sjzk1孔见矿情况

Fig.11 定量解释剖面

Fig.12 研究区磁铁矿深部找矿靶区预测

Table 8 预测磁铁矿深部找矿靶区特征

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