Research on the application of the integrated gravity-magnetic-radioactive geophysical exploration method in the exploration of rare earth deposit in Weishan, western Shandong
LAN Jun1,2(), LI Zhao-Ling1,2, ZHANG Peng1,2, LI Zhi-Min1,2, LI De-Jian3, XING Nan1,2(), SUN Li4,5, YANG Yun-Tao1,2, XU Hong-Yan1,2, WANG Jian1,2, WANG Qiao-Yun6
1. No.5 Geological Team,Shandong Provincial Bureau of Geology and Mineral Resources, Tai'an 271000, China 2. Academician Workstation for Mineralization Research and Exploration of Rare Earth Element Deposits of Shandong Province, Tai'an 271000, China 3. Shandong Weishan Lake Rare Earth Co., Ltd., Jining 277600, China 4. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037,China 5. Key Laboratory of Mineralization and Resource Evaluation, Ministry of Natural Resources, Beijing 100037, China 6. Shandong Institute of Geological Survey, Jinan 250014,China
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.
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.
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
项目
w(U)/10-6
w(Th)/10-6
w(总道Ur)/10-6
背景值
2.4
12.4
15.1
异常下限值
4.6
24.0
21.7
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
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