Research on the application of the integrated gravity-magnetic-radioactive geophysical exploration method in the exploration of rare earth deposit in Weishan, western Shandong
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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。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.
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Key words:
- gravity and magnetic exploration /
- radioactive exploration /
- rare earth /
- Weishan /
- rock mass
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