鞍山—本溪地区眼前山铁矿床深(边)部错断隐伏矿体磁法和瞬变电磁法联合定位及预测

doi:10.19657/j.geoscience.1000-8527.2024.006

现代地质 ›› 2024, Vol. 38 ›› Issue (01): 35-45.DOI: 10.19657/j.geoscience.1000-8527.2024.006

• 中国东部富铁矿成矿机制与找矿预测 • 上一篇下一篇

鞍山—本溪地区眼前山铁矿床深(边)部错断隐伏矿体磁法和瞬变电磁法联合定位及预测

闫迪¹(), 付建飞¹(), 贾三石¹^,²^,³, 程浩¹, 王志猛⁴

1.东北大学资源与土木工程学院,辽宁沈阳 110819
2.东北大学秦皇岛分校资源与材料学院,河北秦皇岛 066004
3.海洋油气勘探国家工程研究中心,北京 100028
4.鞍钢集团矿业弓长岭有限公司井采分公司,辽宁辽阳 111000

收稿日期:2023-11-30 修回日期:2024-01-10 出版日期:2024-02-10 发布日期:2024-03-20
通讯作者: 付建飞,男,博士,副教授,1973年出生,地质学专业,主要从事资源环境探测与评价研究。Email:fujianfei@mail.neu.edu.cn。
作者简介:闫迪,男,硕士研究生,1994年出生,地质资源与地质工程专业,主要从事资源探测研究。Email:2100983@stu.neu.edu.cn。
基金资助:
国家重点研发计划项目(2022YFC2903701)

Combined Magnetic and Transient Electromagnetic Methods to Locate and Predict the Dislocated Concealed Orebody at the Deep Edge of Yanqianshan Iron Deposit in Anshan-Benxi Area

YAN Di¹(), FU Jianfei¹(), JIA Sanshi¹^,²^,³, CHENG Hao¹, WANG Zhimeng⁴

1. School of Resources and Civil Engineering,Northeastern University,Shenyang,Liaoning 110819,China
2. College of Resources and Materials, Qinhuangdao Campus, Northeastern University,Qinhuangdao, Hebei 066004,China
3. National Engineering Research Center for Offshore Oil and Gas Exploration, Beijing 100028, China
4. Well Mining Branch, Angang Group Mining Gongchangling Co., LTD.,Liaoyang,Liaoning 111000,China

Received:2023-11-30 Revised:2024-01-10 Online:2024-02-10 Published:2024-03-20

摘要/Abstract

摘要：

随着地表矿体开采殆尽,找矿需求日益增加,隐伏矿勘探尤其是已有矿山深(边)部的隐伏矿体定位识别成为当前地球物理探测研究的重点和难点问题。鉴于此,本文针对已有矿山深(边)部构造错断隐伏矿体的定位识别,以鞍山—本溪地区(鞍本地区)眼前山典型BIF型铁矿深(边)部隐伏铁矿体为研究对象,基于前期地质和地球物理研究成果,采用地面高精度磁法、基于大定源中心回线装置和多匝重叠回线装置的瞬变电磁法进行联合探测应用研究。探测研究成果表明,地面高精度磁法可以圈定隐伏铁矿体的平面边界,从而缩小找矿靶区,在眼前山铁矿东部及西部偏南区圈定了两处成矿预测区;其中东部异常区通过瞬变电磁法进行定位识别隐伏铁矿体的埋深及形态,并经过钻探验证,发现一处埋深320~410 m的厚大隐伏磁铁矿体,表现为向东稳定延伸并有逐渐增厚的趋势;据此推测具有相似异常特征表现的西部偏南异常区具有较大的找矿潜力。本研究为类似金属矿山常见的不同级别构造错断隐伏矿体的高效定位识别提供了理论支撑和应用依据。瞬变电磁法的多匝重叠回线装置比中心回线装置具有更高的分辨率,也更适合对盖层下隐伏金属矿体的探测定位。

关键词: 隐伏矿体, 眼前山铁矿, 构造错断, 高精度磁法, 瞬变电磁法

Abstract:

It’s becoming more and more challenging to find iron ores with economic values since all iron mines on the surface have been explored. The main directions of iron prospecting turn to the concealed orebodies. In particular, locating and identification of the concealed orebodies in deep (or periphery) parts of the existing mines have become the focus and main challenges of current geophysical exploration projects. With this view, we focus our study on locating and identifying the concealed orebodies in deep (or periphery) structural faults of the existing mines by taking the concealed iron orebodies in Yanqianshan, Anshan-Benxi area as a study case. Based on the previous geology and geophysical studies, we conducted the joint detection application studies by using the ground-based high-precision magnetic method and the transient electromagnetic method, which is based on large fixed source central loop devices and multi-turn overlapping loop devices.The research findings indicate that high-precision ground magnetic methods can delineate the planar boundaries of concealed iron ore bodies, thereby narrowing down prospective mining areas. In the eastern and southwestern sectors of the Yanqianshan Mountain iron ore deposit, two mineralization prediction zones have been identified. In the eastern anomaly zone, transient electromagnetic methods were employed to locate and identify the depth and morphology of concealed iron ore bodies. Through drilling verification, a substantial concealed magnetic iron ore body with a depth of 320 to 410 meters was discovered, exhibiting a stable eastward extension and a gradual thickening trend. Based on these findings, it is inferred that the southwestern anomaly zone, exhibiting similar anomalous characteristics, holds significant exploration potential. The multi-turn overlapping loop device of the transient electromagnetic method has higher resolution than the center loop device and is more suitable for detecting and locating concealed metal ore bodies under the cap layer.

Key words: concealed ore bodies, Yanqianshan Iron Mine, construction error, high-precision magnetic me-thod, transient electromagnetism

中图分类号:

闫迪, 付建飞, 贾三石, 程浩, 王志猛. 鞍山—本溪地区眼前山铁矿床深(边)部错断隐伏矿体磁法和瞬变电磁法联合定位及预测[J]. 现代地质, 2024, 38(01): 35-45.

YAN Di, FU Jianfei, JIA Sanshi, CHENG Hao, WANG Zhimeng. Combined Magnetic and Transient Electromagnetic Methods to Locate and Predict the Dislocated Concealed Orebody at the Deep Edge of Yanqianshan Iron Deposit in Anshan-Benxi Area[J]. Geoscience, 2024, 38(01): 35-45.

图/表 10

图1 研究区区域地质简图 (a)华北克拉通简图 [8];(b)鞍山地区地质简图 [21]

Fig.1 Regional geological maps of the study area

图2 研究区构造示意图[22]

Fig.2 Schematic geologic map showing the structures in the study area[22]

表1 眼前山铁矿床岩(矿)石地球物理参数

Table 1 Geophysical properties of rock ores in Yanqian-shan iron ore deposit

岩(矿) 石名称	块数	磁化率K(10^-5SI)		电阻率ρ(Ω·m)
岩(矿) 石名称	块数	范围	均值	范围	均值
磁铁矿	12	9614~25960	17747	448~3411		1722
假象赤铁矿	8	761~9529	4571	1036~7654		3277
闪长玢岩	8	6~930	229	2188~4971		3934
花岗岩	7	0.05~2	0.4	2256~6178		3500
千枚岩	10	1~17.7	5.3	796~3269		2583
石英片岩	5	0.5~0.7	0.6	1816~42908		13250

图3 眼前山铁矿床磁法测线布置示意图

Fig.3 Schematic diagram of magnetic survey line layout for Yanqianshan iron deposit

图4 眼前山铁矿床高精度磁测数据化极处理后的结果

Fig.4 Results of high-precision magnetic survey data polarity processing for Yanqianshan iron deposit

图5 眼前山铁矿床高精度磁测数据处理结果 (A)不同上延高度异常强度趋势结果对比图:(a)上延25 m;(b)上延100 m;(c)上延200 m;(d)上延300 m;(e)上延400 m;(f)上延600 m。(B)垂向1阶导数结果对比图:(g)上延25 m垂向1阶导数处理;(h)上延100 m垂向1阶导数处理;(i)上延200 m垂向1阶导数处理;(j)上延300 m垂向1阶导数处理;(k)上延400 m垂向1阶导数处理;(l)上延600 m垂向1阶导数处理

Fig.5 High precision magnetic survey data processing for Yanqianshan iron deposit

图6 磁异常场与叠加了-300 m标高矿体空间位置图

Fig.6 Magnetic anomaly field and spatial location map of ore bodies stacked at an elevation of -300 meters

图7 GDP-32的测线g1探测数据处理结果

Fig.7 Processing results of line g1 detection data for GDP-32

图8 TerraTEM的测线t1探测数据处理结果

Fig.8 TerraTEM line t1 detection data processing results

图9 YZK1钻孔验证剖面图

Fig.9 Diagrammatic cross-section from the validation by drilling YZK1

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鞍山—本溪地区眼前山铁矿床深(边)部错断隐伏矿体磁法和瞬变电磁法联合定位及预测

Combined Magnetic and Transient Electromagnetic Methods to Locate and Predict the Dislocated Concealed Orebody at the Deep Edge of Yanqianshan Iron Deposit in Anshan-Benxi Area

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