基于多道伽马能谱测量的离子吸附型稀土矿放射性勘查方法研究——以攀西德昌地区为例

doi:10.11720/wtyht.2024.1407

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Abstract

The Mianning-Dechang rare earth element (REE) metallogenic belt exhibits considerable resource potential. Previous prospecting was oriented to hard-rock REE deposits associated with Himalayan alkaline complexes, with ion adsorption-type REE deposits under-studied. To explore the mineralization prospect of granite weathering crusts widespread in the metallogenic belt, this study investigated the Shizishan area through multi-channel gamma-ray spectrometry, soil profile survey, and shallow drilling. One ion adsorption-type REE ore occurrence was identified in the granite weathering crust at Mosuoying. This study analyzed the radioactive response of the geological, geophysical, and geochemical profiles and ore contents, finding that the elemental contents of thorium (Th) and potassium (K) were highly indicative of REE and rare metal mineralization. Highly mineralized, industrial-scale ion adsorption-type REE deposits will likely occur when 6.25<w(Th)/w(K)<10, w(eTh)>37×10^-6, and w(eK)>4.2%. As revealed by the analysis of the response of radioactive anomalies to supergene weathering, thorium anomaly halos can effectively indicate granitic plutons while potassium anomaly halos can well delineate the extent of granite weathering crusts.

Key words： gamma-ray spectrometry ion adsorption-type REE deposit niobium-tantalum mineralization supergene weathering Dechang area in the Panzhihua-Xichang region

Received: 26 September 2023 Published: 21 October 2024

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	Articles by authors
	Huai-Yuan LI
	Fei NIE
	Shou-Jin JIANG
	Jun-Feng HU
	Jia-Zuo ZOU
	Jin-Chen GUO

Cite this article:

Huai-Yuan LI,Fei NIE,Shou-Jin JIANG, et al. An exploration method for the radiation of ion adsorption-type rare earth element deposits based on multi-channel gamma-ray spectrometry: A case study of the Dechang area in the Panzhihua-Xichang region[J]. Geophysical and Geochemical Exploration, 2024, 48(5): 1275-1283.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1407 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I5/1275

Tectonic map (a) and geological map (b) of the study area
1—fine-grained dolomitic diorite of Maoping unit; 2—coarse-medium-grained black dolomitic diorite of Kelang unit; 3—fine-grained porphyritic dolomitic diorite of Ranfangou unit; 4—Quaternary system; 5—measured faults; 6—extent of gamma-energetic spectral profiles; 7—extent of soil profiles; 8-Physical and chemical composite profiles; 9—phyllic dyke veins, granitic porphyritic veins; 10—drill holes

代号	铀含量/10^-6			钍含量/10^-6			钾含量/10^-6			异常上限/10^-6			频数
代号	$X -$	S	C_V	$X -$	S	C_V	$X -$	S	C_V	U	Th	K	频数
Q	4.98	1.88	0.38	18.85	9.02	0.48	2.12	1.04	0.49	7.35	26.39	3.63	41
Pt₂R	7.90	2.47	0.31	28.64	10.87	0.38	3.81	1.31	0.34	7.90	64.47	6.64	243
Pt₂K	7.45	2.31	0.31	30.64	10.44	0.34	3.71	1.24	0.33	16.91	68.33	7.37	1159
Pt₂M	11.07	2.49	0.23	34.01	11.69	0.34	5.98	1.37	0.23	11.07	60.06	5.98	15
Q	7.09	2.12	0.29	24.7	7.98	0.32	3.29	0.98	0.29	16.58	65.98	6.25	755
平均值	7.28	2.33	0.32	28.01	10.47	0.37	3.56	1.25	0.35

Gamma-ray spectrum parameters of major geologic bodies in the study area

参数	偏高晕	高晕	异常晕
参数	$X ˉ$ +S≤ Q≤ $X ˉ$ +2S	$X ˉ$ +2S≤ Q≤ $X ˉ$ +3S	Q≥ $X ˉ$ +3S
U	9.51≤Q≤11.73	11.73≤Q≤13.94	13.94≤Q≤21.90
Th	37.87≤Q≤47.87	47.87≤Q≤57.87	57.87≤Q≤83.61
K	4.78≤Q≤6.03	6.03≤Q≤7.28	7.28≤Q≤10.63

Multichannel spectrum anomaly classification table

Plane contour map of the results of ground-based gamma spectrometry measurements at Shizishan
a—plane contour of uranium channel content;b—plane contour of thorium channel content;c—plane contour of potassium channel content;d—plane of total tract content

Characterization of measured content of soil profiles in the study area

Shallow drill sampling grade map of Shizishan (red line is boundary grade)

L240 comprehensive physico-chemical profile

Scatter plot of the correlation between rare earth oxides and the content of each single element
a—Th,K element scatter plot;b—U,K element scatter plot;c—Th,U element scatter plot

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