重磁放综合物探方法在鲁西微山稀土矿勘查中的应用

doi:10.11720/wtyht.2023.0189

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摘要

鲁西微山县郗山稀土矿周边多为第四系覆盖,在该地区使用单一的物探找矿方法寻找稀土效果不佳。为了建立适用于该地区深部稀土找矿的地质—地球物理找矿模型,在已知地质剖面开展多种物探技术实验,选出适用于该区稀土矿深部勘查的技术方法组合。通过重力测量和高精度磁测大致确定了地下中生代郗山碱性杂岩体的分布范围,通过地面伽马能谱测量在地表圈定出矿体露头,采用钻探工作对矿体的深部特征予以揭露。由此探索出一套“重磁联合圈定岩体+放射性定位矿体露头+深部钻探”的勘查技术方法组合。通过运用该勘查模型,在该区发现特大型稀土矿床1处,为周边地区的稀土矿勘查提供了借鉴。

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	兰君
	李兆令
	张鹏
	李志民
	李得建
	邢楠
	孙莉
	杨云涛
	徐洪岩
	王健
	王巧云

关键词 ：重磁勘探, 放射性勘查, 稀土, 微山, 岩体

Abstract：

Since the periphery of the Xishan rare earth deposit in Weishan County, western Shandong is mostly covered by the Quaternary strata, single geophysical exploration methods are ineffective in searching for rare earth elements in this area. To establish a geological-geophysical prospecting model for deep rare earth prospecting in this area, a combination of exploration techniques and methods suitable for the deep exploration of rare earth deposits in this area were selected through multiple geophysical exploration technology experiments on the known geological profiles. The distribution range of the underground Mesozoic Xishan alkaline complex was roughly determined through gravity survey and high-precision magnetic survey. The ore body outcrop was delineated through ground-based gamma spectrometry, and the deep ore body characteristics were revealed through drilling. Finally, this study developed an integrated geophysical exploration method including gravity-magnetic joint delineation of rock masses, radioactive positioning for ore body outcrops, and deep drilling. By using this exploration model, one super-large rare earth deposit was discovered in this area, providing a reference for the exploration of rare earth deposits in the surrounding area.

Key words： gravity and magnetic exploration radioactive exploration rare earth Weishan rock mass

收稿日期: 2023-05-04 修回日期: 2023-08-01 出版日期: 2023-12-20

P631

基金资助:山东省自然资源厅勘查基金项目“山东省微山县郗山地区稀土矿深部及外围调查评价”(鲁勘字(2018)30号);山东地矿局基金项目“微山—枣庄地区稀土矿成矿作用及找矿方向研究”(鲁地[2021]6号);“济宁市郗山地区稀土矿成矿机理研究”(鲁地字[2022]15号);山东省自然科学基金项目(2R2020MD033)

通讯作者: 邢楠(1986-),男,高级工程师,现从事矿产勘查工作。Email:407615595@qq.com

作者简介: 兰君(1986-),男,高级工程师,现从事稀土勘查科研工作。Email:lanjun56@126.com

引用本文:

兰君, 李兆令, 张鹏, 李志民, 李得建, 邢楠, 孙莉, 杨云涛, 徐洪岩, 王健, 王巧云. 重磁放综合物探方法在鲁西微山稀土矿勘查中的应用[J]. 物探与化探, 2023, 47(6): 1417-1424.
LAN Jun, LI Zhao-Ling, ZHANG Peng, LI Zhi-Min, LI De-Jian, XING Nan, SUN Li, YANG Yun-Tao, XU Hong-Yan, WANG Jian, WANG Qiao-Yun. Research on the application of the integrated gravity-magnetic-radioactive geophysical exploration method in the exploration of rare earth deposit in Weishan, western Shandong. Geophysical and Geochemical Exploration, 2023, 47(6): 1417-1424.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.0189 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I6/1417

Fig.1 研究区板块构造位置(a)和鲁西地区地质简图(b)^[12]
1—前寒武纪基底;2—古生代地层;3—中生代地层;4—新生代地层;5—中生代岩浆岩;6—断层;7—微山稀土

Fig.2 郗山地区地质简图
1—第四系;2—中生代燕山晚期郗山碱性杂岩体;3—新太古代侵入岩;4—含稀土石英重晶石碳酸岩脉;5—脉型矿体;6—细脉浸染型矿体;7—断层;8—勘查线剖面及编号;9—地质-地球物理模型剖面;10—综合物探测量范围

Fig.3 郗山稀土矿矿石类型
a、b—含稀土石英重晶石碳酸岩脉;c、d—细脉浸染型矿石

Fig.4 郗山地区重力异常等值线

Fig.5 郗山地区ΔT化极等值线

Table 1 郗山地区放射性元素异常下限统计

Fig.6 郗山地区钍元素分布等值线

Fig.7 郗山地区铀元素分布等值线

Fig.8 郗山地区γ能谱总量分布等值线

Fig.9 微山县郗山稀土矿地质—地球物理勘查模型(13线)
1—布格重力实测曲线;2—磁法实测曲线;3—铀含量曲线;4—钍含量曲线;5—钾含量曲线;6—总量当量曲线;7—重力拟合曲线;8—磁法拟合曲线;9—第四系;10—新太古代侵入岩;11—中生代郗山碱性杂岩体;12—含稀土石英重晶石碳酸岩脉;13—细脉浸染型矿体;14—夹层;15—钻孔

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