滇西南西盟—澜沧地区土壤稀土地球化学异常的发现及找矿意义

doi:10.11720/wtyht.2024.2014

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Abstract

The Ximeng-Lancang area in southwestern Yunnan resides in the southern section of the Nujiang-Lancangjiang-Jinshajiang orogenic belt in Southwest China. The 1∶50,000 geochemical soil survey revealed 24 rare-earth-element (REE) geochemical anomalies, which are primarily distributed in the Carboniferous Pingzhang Formation mafic volcanic rocks and the Carboniferous-Permian Yutangzhai Formation sedimentary carbonate rocks within and near the Changning-Menglian deep fault zone. Furthermore, the AP00 REE geochemical anomalies ranking high in the evaluation were analyzed in detail through a 1∶10,000 geochemical soil survey, a 1∶10,000 special geological survey, and light-duty prospecting engineering in mountainous areas. A new type of REE ores in weathering crusts has been first discovered in sedimentary carbonate strata, with preliminarily estimated REE resources reaching a medium scale, suggesting a prospecting breakthrough. This finding shows a new prospecting approach, which can be referenced for similar research. As revealed by a comprehensive analysis of the regional geological and geochemical settings and the data of AP00 REE anomalies, the AP00 REE ores in weathering crusts have undergone a gradual enrichment and mineralization process involving four different geological processes, suggesting polygenetic compound REE ores. Considering the low leaching efficiency of AP00 REE ores and significant structural (magmatic) superimposed mineralization of the heavy REE yttrium, it is inferred that yttrium-dominated primary REE ores might exist in the deep part, implying high potential for heavy-REE ores.

Key words： REE geochemical anomalies REE ores in weathering crusts prospecting implication soil Ximeng-Lancang

Received: 14 January 2022 Published: 27 June 2024

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	Kui-Rui XIE
	Xu-Feng SONG
	Kun ZHOU
	Yu-Guo ZHOU
	Zhong-Ming SHE
	Jian TANG

Cite this article:

Kui-Rui XIE,Xu-Feng SONG,Kun ZHOU, et al. REE geochemical anomalies in soils of the Ximeng-Lancang area in southwestern Yunnan and their discovery and their implications for ore prospecting[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 660-667.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.2014 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/660

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Geological map of Ximeng-Lancang area (simplified revision according to reference[6])

地层单元	参数	Y	La	Ce	Eu	Tb	Yb	REE
N-Q	平均值	35.2	49.5	97.1	1.65	1.27	3.91	193
N-Q	富集系数	1.17	1.09	1.03	1.19	1.09	1.18	1.07
J	平均值	21.5	37.0	76.0	1.09	0.84	2.47	141
J	富集系数	0.71	0.81	0.81	0.78	0.72	0.75	0.78
P	平均值	45.8	46.8	99.3	1.71	1.37	4.61	207
P	富集系数	1.52	1.03	1.06	1.23	1.17	1.39	1.15
CPy	平均值	169	101	137	3.53	3.45	9.10	442
CPy	富集系数	5.62	2.22	1.46	2.54	2.94	2.75	2.45
$C p z^$	平均值	63.1	75.3	145	3.37	2.34	5.18	305
$C p z^$	富集系数	2.09	1.66	1.54	2.43	2.00	1.56	1.70
DC	平均值	18.2	32.9	74.1	0.88	0.71	2.16	131
DC	富集系数	0.60	0.72	0.79	0.64	0.61	0.65	0.73
D	平均值	41.3	53.3	102	1.76	1.45	4.70	207
D	富集系数	1.37	1.17	1.08	1.26	1.24	1.42	1.15
Pt₃	平均值	30.5	49.5	111	1.69	1.37	3.13	202
Pt₃	富集系数	1.01	1.09	1.19	1.22	1.17	0.95	1.12
Pt₂	平均值	23.9	42.5	90.8	1.41	1.19	2.15	163
Pt₂	富集系数	0.79	0.94	0.97	1.01	1.01	0.65	0.90
ηγT	平均值	34.1	50.0	122	0.95	1.49	2.67	214
ηγT	富集系数	1.13	1.10	1.29	0.69	1.27	0.81	1.19
全区	平均值	30.1	45.4	94.0	1.39	1.17	3.13	180
中国土壤^[20]	平均值	23.0	38.0	72.0	1.20	0.80	2.60	138

Content characteristics of soil rare earth elements in various geological units and the whole region in Ximeng-Lancang area^[19]

Main ore-forming elements and total rare earth elements anomaly analysis in AP00 rare earth anomaly

Content comparison of ∑REE in different geological layers in AP00 anomaly area^[6]

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