放射性测量方法在稀有稀土矿勘查中的应用——以小兴安岭地区南岔区某铀异常点为例

doi:10.11720/wtyht.2022.2500

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Abstract

The mineralization of deposits of rare metals such as tantalum and niobium in China is mostly related to granite pegmatite. The enrichment of rare metals in these deposits is accompanied by the formation of radioactive minerals, such as albite, monazite, and high-grade uranium, and these deposits have paragenetic and associated minerals uranium deposits. Therefore, radioactive prospecting has become the most convenient and effective method to explore deposits of rare metals such as REEs, Nb, and Ta. Based on the close correlation between mineralization and radioactivity of rare earth minerals, this study fully investigated the parameter characteristics of the surveyed energy spectrum data through the combination of airborne radioactivity measurement and ground gamma spectrometry measurement to determine prospecting indicators. A new niobium-tantalum-rubidium polymetallic mineralized point was discovered in the Nancha area, Yichun City using the radioactive prospecting method, which was thus proven effective.

Key words： Niobium, tantalum, and rubidium rare metals mineralization of uranium and thorium gamma ray spectrometry

Received: 02 November 2020 Published: 17 August 2022

ZTFLH:

P631

Corresponding Authors: Li Zhan-Long E-mail: 441235080@qq.com;909953001@qq.com

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	Rui Wang
	Zhan-Long Li
	Tao Ma

Cite this article:

Rui Wang,Zhan-Long Li,Tao Ma. Application of radioactive prospecting in exploration of rare metal minerals: A case study of a uranium anomaly in the Nancha area[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 854-861.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.2500 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/854

Geological and Uranium anomaly map of Tangwang river in Nancha district
1—Quaternary low-river floodplain deposits; 2—the Quaternary Pleistocene Belahong River group; 3—middle Jurassic Taitun group; 4—lower Ordovician Baoquan group; 5—lower Cambrian Chenming group; 6—Dongfeng Mountain rock group; 7—Honglin rock group; 8—the Granodiorite of early Cretaceous epoch; 9—the Monzogranite of late Permian-early triassic; 10—the Syenogranite of late Permian-early Triassic; 11—the Monzogranite of late Permian-early Triassic; 12—the Alkali Feldspar Granite of late Permian-early Triassic; 13—the monzogranite of late Ordovician; 14—the Granite of Neo-Meso-Proterozoic; 15—airborne radioactive anomaly; 16—aeronautical radioactive high field

Geological map of the study area
1—Quaternary; 2—lower Cambrian Chenming group; 3—the gneissic monzogranite of late Ordovician; 4—granitic porphyry vein;
5—mineral body; 6—trough engineering

Tabular statement of logarithmic normal distribution test of energy spectrum data

Geological of the study area(a) and distribution map of uranium anomaly halo(b)
1—Quaternary; 2—lower Cambrian Chenming group; 3—the gneissic monzogranite of late Ordovician; 4—granitic porphyry vein; 5—the mineral body of Rb, Nb and Ta

Statistical table for digital characteristics of energy spectrum data

An histogram for logarithmic distribution of energy spectrum data of Uranium content(a),Thorium content(b),Potassium content(c) and total content(d)

参数	数学模型	地质意义
钍铀比	Th/U	钍铀比值的变化可以指示蚀变、矿化等特殊地质作用过程
古铀量 (Gu)	Th/( $T h ¯$ / $U ¯$ )	利用古铀与现代铀差异评价铀元素在成岩后活化迁移路径及淋失、叠加情况
交代蚀变 (F)	(U·K)/Th	利用U、K、Th元素稳定性和迁出迁入能力不同反映元素在后期成矿作用中的交代蚀变情况

Characteristic parameter

Contour profile of ground gamma spectrum measurement parameters
1—mineralizer; 2—granitic porphyry vein; 3—speculated fracture; 4—the aomaly area of the value of F;a—contour map of Uranium content;b—contour map of Paleouranium content;c—contour map of the ratio of Uranium and Thorium;d—contour map of the value of metasomatic alteration

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