寒冷半干旱草原景观大比例尺微沟系测量样品粒级试验——以锲墨格山锂铍稀有矿为例

doi:10.11720/wtyht.2023.2700

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Abstract

The Qiemoge Mountain area in Tianjun County, Qinghai Province has a cold, semi-arid grassland landscape. A pegmatite belt with a width of 300~500 m and an intermittent extended length of 7 km has developed on the surface of this area. The rare Li-Be ores have been discovered during the current exploration in this area. To provide a reliable geochemical basis for the prospecting of rare metals and rare earth elements (REE) in areas with similar landscapes, this study conducted the grain-scale experiment and validity investigation in this study area using the large-scale micro-channel system geochemical survey technique. Based on the 1∶25,000 geochemical survey, grain sizes of -4~+ 20 meshes, -4~+ 40 meshes, -10~+ 40 meshes, and -10~+ 60 meshes were adopted in sampling for the experimental study in the zones bearing pegmatite veins. The contents of Cu, W, Sn, Be, Li, Nb, Rb, Zr, La, and Y were analyzed. The results show that relevant elements exhibited significant enrichment and dispersion characteristics and the geochemical distribution of these elements agreed well with the geological and mineral characteristics when grain sizes of -4~+ 40 meshes and -10~+ 40 meshes were adopted for the sampling of Be, Li, Nb, Rb, and Zr, grain sizes of -10~+ 40 meshes were adopted for the sampling of rare earth elements such as La and Y, and grain sizes of -10~+ 60 meshes were adopted for the sampling of nonferrous metal elements such as Cu, W, and Sn. The results of this study prove that the large-scale micro-channel system survey technique can obtain significant results in the geochemical prospecting of rare metals and REEs in areas with similar landscapes.

Key words： 1∶25,000 geochemical survey micro-channel system Li-Be rare ore grain size cold semi-arid grassland landscape Qiemoge Mountain

Received: 26 December 2021 Published: 05 July 2023

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	Shan-Dong BAO
	Xiang-Lei XIE
	Ya-Dong WANG
	Yun-Fu XU
	Xin-Yuan ZHANG
	Biao ZENG

Cite this article:

Shan-Dong BAO,Xiang-Lei XIE,Ya-Dong WANG, et al. Grain-scale experimental study of samples using the large-scale micro-channel system survey technique for the cold, semi-arid grassland landscape: A case study of the rare Li-Be ores in the Qiemoge Mountain[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 648-658.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.2700 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/648

Geotectonic location map of study area
1—central Qilian magmatic arc; 2—south Qilian magmatic arc; 3—Zongwulongshan-Xiahe terrestrial rift; 4—Quanji plot; 5—Tanjianshan magmatic arc; 6—ophiolite melange belt in northern Chaidamu basin; 7—Chaidamu basin; 8—the northern slope of Qimantage-Xiariha magmatic arc; 9—northern Kunlun magmatic arc; 10—continental margin arc of the Elashan; 11—Zeku foreland basin; 12—boundary faults and study area

Geological map of Qiemogeshan area
1—Quaternary strata; 2—early-middle Triassic Longwuhe formation; 3—Carboniferous-middle Permian Guokeshan formation; 4—Carboniferous-middle Permian Tuergendaban formation; 5—early Permian quartz diorite; 6—granite pegmatite veins; 7—lithium/beryllium orebody; 8—reverse faults and faults of unknown nature; 9—ductile shear zones; 10—geological boundary; 11—sampling point and range

Distribution map of sampling points in study area

样品粒级	参数	Be	Cu	La	Li	Nb	Rb	Sn	W	Y	Zr
-4~+20目	最小值/10^-6	1.25	11.40	19.20	11.00	6.50	43.70	1.36	0.32	12.30	89.30
	最大值/10^-6	50.70	165.00	46.30	161.00	20.10	295.00	10.29	9.27	40.00	239.00
	平均值/10^-6	2.59	22.54	34.23	49.66	11.84	100.99	2.51	1.13	20.92	139.58
	中位数/10^-6	2.38	22.00	34.00	36.20	10.85	101.00	2.38	0.91	20.95	131.00
	标准离差/10^-6	0.67	6.66	5.52	37.89	3.41	31.46	0.58	0.66	4.56	30.47
	浓集系数	1.33	1.11	1.06	1.63	1.03	1.00	0.98	0.68	1.04	0.85
	变异系数C_V1	1.565	0.723	0.161	0.763	0.288	0.414	0.523	0.969	0.247	0.229
	变异系数C_V0	0.26	0.295	0.161	0.763	0.288	0.312	0.233	0.592	0.218	0.218
-4~+40目	最小值/10^-6	1.45	10.60	22.10	8.40	6.50	40.70	1.44	0.33	13.70	89.10
	最大值/10^-6	55.80	78.60	55.40	198.00	18.80	343.00	10.47	182.00	35.80	223.00
	平均值/10^-6	2.69	23.76	32.45	45.47	12.13	106.30	2.61	1.12	20.65	143.75
	中位数/10^-6	2.48	24.20	31.70	39.20	11.45	113.00	2.45	0.95	20.20	136.00
	标准离差/10^-6	0.86	7.44	6.18	28.05	3.60	32.52	0.68	0.69	4.59	33.59
	浓集系数	1.38	1.17	1.00	1.49	1.05	1.06	1.02	0.67	1.03	0.87
	变异系数C_V1	1.653	0.416	0.233	0.763	0.297	0.409	0.513	2.037	0.234	0.234
	变异系数C_V0	0.322	0.313	0.191	0.617	0.297	0.306	0.261	0.619	0.223	0.234
-10~+40目	最小值/10^-6	1.51	11.90	23.20	15.90	6.80	47.70	1.39	0.33	12.20	79.50
	最大值/10^-6	58.00	73.30	88.00	168.00	20.00	243.00	12.48	11.40	50.60	237.00
	平均值/10^-6	2.60	22.42	34.85	39.04	12.39	104.63	2.49	1.50	23.18	141.90
	中位数/10^-6	2.55	21.85	34.90	36.30	11.80	106.00	2.48	1.51	22.25	136.00
	标准离差/10^-6	0.49	5.19	5.60	14.80	3.41	28.10	0.44	0.76	5.76	34.03
	浓集系数	1.33	1.11	1.08	1.28	1.08	1.04	0.97	0.9	1.15	0.86
	变异系数C_V1	1.751	0.377	0.229	0.629	0.275	0.332	0.478	0.849	0.298	0.24
	变异系数C_V0	0.188	0.232	0.161	0.379	0.275	0.269	0.175	0.508	0.248	0.24
-10~+60目	最小值/10^-6	1.03	6.37	14.40	11.30	6.70	43.40	1.04	0.36	9.50	53.90
	最大值/10^-6	54.30	81.60	47.40	175.00	24.40	382.00	13.49	22.70	39.70	256.00
	平均值/10^-6	2.30	23.57	32.60	38.11	12.30	97.60	2.45	1.20	20.63	129.29
	中位数/10^-6	2.17	23.00	31.70	32.65	11.05	95.80	2.19	0.96	19.10	120.50
	标准离差/10^-6	0.61	7.26	6.20	23.62	4.14	30.43	0.92	0.72	5.88	31.92
	浓集系数	1.18	1.16	1.01	1.25	1.07	0.97	0.96	0.72	1.02	0.79
	变异系数C_V1	1.788	0.399	0.190	0.790	0.337	0.454	0.701	1.587	0.298	0.278
	变异系数C_V0	0.265	0.308	0.19	0.62	0.337	0.312	0.378	0.598	0.285	0.247
青海省丰度^[17]/10^-6		1.95	20.24	32.41	30.45	11.52	100.53	2.56	1.67	20.13	164.54

Characteristic of grain-size element parameters from different samples in the study area

Concentration coefficient curves of each particle

The C_V1 curve (a) and C_V1/C_V0 curve (b) of each particle size were studied

Geochemical maps of element Be in samples of mesh -4~+20(a), -4~+40(b), -10~+40(c), -10~+60(d)

Geochemical maps of element Li in samples of mesh -4~+20(a), -4~+40(b), -10~+40(c), -10~+60(d)

Geochemical maps of element Rb in samples of mesh -4~+20(a), -4~+40(b), -10~+40(c), -10~+60(d)

Geochemical maps of element Nb in samples of mesh -4~+20(a), -4~+40(b), -10~+40(c), -10~+60(d)

Geochemical maps of element Zr in samples of mesh -4~+20(a), -4~+40(b), -10~+40(c), -10~+60(d)

Geochemical maps of element La in samples of mesh -4~+20(a), -4~+40(b), -10~+40(c), -10~+60(d)

Geochemical maps of element Y in samples of mesh -4~+20(a), -4~+40(b), -10~+40(c), -10~+60(d)

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