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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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

Received: 04 May 2023 Published: 23 January 2024

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	Jun LAN
	Zhao-Ling LI
	Peng ZHANG
	Zhi-Min LI
	De-Jian LI
	Nan XING
	Li SUN
	Yun-Tao YANG
	Hong-Yan XU
	Jian WANG
	Qiao-Yun WANG

Cite this article:

Jun LAN,Zhao-Ling LI,Peng ZHANG, et al. Research on the application of the integrated gravity-magnetic-radioactive geophysical exploration method in the exploration of rare earth deposit in Weishan, western Shandong[J]. Geophysical and Geochemical Exploration, 2023, 47(6): 1417-1424.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.0189 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I6/1417

12]
1—Precambrian basement; 2—Paleozoic strata; 3—Mesozoic strata; 4—Cenozoic strata; 5—Mesozoic igneous rock; 6—fault; 7—Weishan rare earth
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Plate tectonic location map of the research area(a) and regional geological map of the western Shandong^[12]
1—Precambrian basement; 2—Paleozoic strata; 3—Mesozoic strata; 4—Cenozoic strata; 5—Mesozoic igneous rock; 6—fault; 7—Weishan rare earth

Regional geological map of Xishan area
1—Quaternary system; 2—late Mesozoic Yanshan Xishan alkaline complex; 3—Neoarchean intrusive rock; 4—carbonate vein containing rare earth quartz barite; 5—vein type ore body; 6—fine vein disseminated ore body; 7—fault; 8—survey line profile and number; 9—geological geophysical model profile; 10—comprehensive geophysical measurement range

Ore type of Xishan rare earth ore
a、b—carbonate vein containing rare earth quartz barite; c、d—veined disseminated ore

Gravity anomaly of Xishan area

Magnetic anomaly of Xishan area

Statistical table of the lower limit of radioactive element anomalies in Xishan area

Thorium element distribution of Xishan area

Uranium element distribution of Xishan area

γ total energy spectrum distribution of Xishan area

Geological geophysical exploration model of Xishan rare earth deposit in Weishan County(line 13)
1—Bouguer gravity measurement curve; 2—magnetic method measured curve; 3—uranium content curve; 4—thorium content curve; 5—potassium content curve; 6—total equivalent curve; 7—gravity fitting curve; 8—magnetic fitting curve; 9—Quaternary system; 10—Neoarchean intrusive rock; 11—Mesozoic Xishan alkaline complex; 12—carbonate vein containing rare earth quartz barite; 13—fine vein disseminated ore body; 14—interlayer; 15—drilling

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