鲁西北潘店重磁异常带矽卡岩型铁矿精细找矿方向——来自广域电磁法深部找矿的启示

doi:10.11720/wtyht.2024.1157

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摘要

山东省鲁西北潘店地区超深覆盖区航磁和重力异常明显,通过系统的重磁异常查证工作,在研究区重磁异常带开展的多个钻孔均取得了深部矽卡岩型铁矿床找矿突破,但由于重磁异常带范围较大且其特征不能直接指示找矿方向,造成部分钻孔不见矿或见矿情况差。因此,为了更好地在重磁异常带精细圈定成矿位置,实现新的更大的找矿大突破,本文旨在已查证的潘店重磁异常带开展广域电磁测深(WFEM)工作,结合钻探验证情况,圈定深覆盖区矽卡岩型铁矿深部成矿区间及成矿有利结构面,提出深部精细找矿方向。

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	郭国强
	李亚东
	王阳
	于嘉宾
	王润生
	高晓丰
	张大明
	胡东宁
	方磊
	国玮芳

关键词 ：潘店地区, 矽卡岩型铁矿, 重磁异常带, 广域电磁测深, 精细找矿方向

Abstract：

Significant aeromagnetic and gravity anomalies were found in the ultra-deep coverage zone of the Pandian area in the northwestern Shandong Province. Through systematic verification of gravity and magnetic anomalies, a breakthrough in prospecting for deep skarn iron deposits has been achieved through several boreholes around the Pandian gravity-magnetic anomaly zone. However, the gravity-magnetic anomaly zone spreads extensively and its characteristics cannot directly indicate the prospecting target, thus some boreholes failed to find ores or revealed poor ore-finding conditions. Hence, to accurately delineate the ore-forming location in the gravity-magnetic anomaly zone and achieve a further breakthrough in ore prospecting, this study conducted the wide-field electromagnetic (WFEM) sounding in the verified Pandian gravity-magnetic anomaly zone. Combining the drilling verification, this study delineated the deep ore-forming interval of skarn iron deposits in the deep coverage zone and the favorable structural plane for ore-forming, suggesting the deep fine-scale prospecting targets.

Key words： Pandian area skarn iron deposit gravity-magnetic anomaly zone wide-field electromagnetic sounding fine-scale prospecting target

收稿日期: 2023-04-10 修回日期: 2023-05-31 出版日期: 2024-04-20

ZTFLH:

P631

基金资助:全国重要矿集区找矿预测项目“山东省齐河—禹城矿集区找矿预测”(DD2016005223);山东省自然资源厅2022年部省协议地质勘查项目(鲁勘字(2022)24号);山东省地质矿产勘查开发局2022年度局地质勘查引领示范与科技攻关项目(鲁地字[2022]15号);山东省重大科技创新工程项目(2018CXGC1601)

作者简介: 郭国强(1980-),男,高级工程师,主要从事深部地球物理新技术新方法的应用与研究工作。Email:gsr211@163.com

引用本文:

郭国强, 李亚东, 王阳, 于嘉宾, 王润生, 高晓丰, 张大明, 胡东宁, 方磊, 国玮芳. 鲁西北潘店重磁异常带矽卡岩型铁矿精细找矿方向——来自广域电磁法深部找矿的启示[J]. 物探与化探, 2024, 48(2): 327-333.
GUO Guo-Qiang, LI Ya-Dong, WANG Yang, YU Jia-Bin, WANG Run-Sheng, GAO Xiao-Feng, ZHANG Da-Ming, HU Dong-Ning, FANG Lei, GUO Wei-Fang. Fine-scale prospecting targets of skarn iron deposits in the Pandian gravity-magnetic anomaly zone of northwestern Shandong Province: Insights from deep prospecting using the wide-field electromagnetic method. Geophysical and Geochemical Exploration, 2024, 48(2): 327-333.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1157 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I2/327

Fig.1 研究区地质构造简图

Table 1 研究区电物性特征统计

Fig.2 潘店重磁异常
a—剩余重力异常;b—航磁化极异常

Fig.3 广域电磁测深L1剖面综合推断

Fig.4 广域电磁测深L2剖面综合推断

Fig.5 广域电磁测深L3剖面综合推断

Fig.6 矽卡岩型铁矿成矿模型

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