岩屑测量方法在干旱荒漠区的找矿效果——以贺兰山北段嘎拉斯台白钨矿的发现为例

doi:10.11720/wtyht.2019.1025

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Abstract

In the northern part of Helan Mountain, the structure is active and strong, the mid-acid intrusive rock is well developed, and the metallogenic exploration is favorable. The mineral prospecting indicators have rich information, suggesting a good gold and tungsten prospecting area. This area is characterized by arid low mountain and hilly desert geochemical landscape. The 1∶200,000 river sediment measurement work completed by the previous workers in this area is limited by unfavorable conditions such as sampling media, sample grain level, test equipment, and analysis methods, making the useful prospecting information weak. In this study, the chemical exploration work used an irregular network of 1∶50,000 rock debris measurement, -4 to +20 sampling grain meshes, and a C-layer working technical method in sampling layer, which led to the delineation of 30 comprehensive anomalies. There are 9 anomalies of Au, W, As, and Sn in the distribution area of the metamorphic rock in the second rock group in Yanqun area of Helan Mountain. Through anomaly verification, 14 new ore spots and mineralization spots were discovered, and 3 of them were identified. , In addition, 9 mineral target areas were selected through optimization. Thus, good ore prospecting results were obtained. For the first time, laminated scheelite was found in the silicified shallower part of the second group of Helan Mountain Rock Group. The significance of this discovery lies not only in the discovery of ore spots in the investigation area but also in the study of formation environment of known stratabound scheelite ore deposits in China. The orebodies were produced in the meso-deep horizons of metamorphic rocks and are characterized by stratiform or stratoid forms, which is very rare in the world.

Key words： rock debris measurement method arid desert area galasitai scheelite deposit meso-deep horizons of metamorphic rocks northern Helan Mountain

Received: 15 January 2018 Published: 20 February 2019

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	Hua-Qi CHEN
	Yong-Qin LI

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Hua-Qi CHEN,Yong-Qin LI. The prospecting effect of rock debris measurement method in arid desert area: Exemplified by the discovery of the Galasitai scheelite deposit in northern Helan Mountain[J]. Geophysical and Geochemical Exploration, 2019, 43(1): 55-63.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1025 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I1/55

Geological sketch map of northern Helan Mountain

Geochemical anomaly of northern Helan Mountain

Combined anomaly of Au, As, W, and Sn in the Gangoumen-Galasitai area

异常编号	元素编号	平均值	峰值	异常下限	异常面积	衬度	异常规模	浓度分带	异常形态
	Ag-28	0.25	0.26	0.1	0.6	2.45	1.47	中、外	近椭圆
	Ag-29	0.3	0.3	0.1	0.32	3	0.96	中、外	近椭圆
	As-26	15.74	34	8	1.55	1.97	3.05	中、外	不规则
	As-27	11.43	11.9	8	0.5	1.43	0.72	外	不规则
	Au-22	72.7	72.7	2.5	0.47	29.08	13.61	内、中、外	近椭圆
	Au-31	7.3	7.3	2.5	0.38	2.92	1.1	中、外	不规则
	Cr-16	110.19	130	90	1.76	1.22	2.16	外	不规则
Hs17	Cu-7	53.7	75.8	30	0.48	1.79	0.87	中、外	不规则
	Cu-10	43.73	54.4	30	0.66	1.46	0.96	外	不规则
	Zn-10	254.03	360	95	0.71	2.67	1.89	中、外	近椭圆
	Zn-11	156.5	207	95	0.43	1.65	0.71	中、外	不规则
	Mo-17	3.71	3.71	1	0.36	3.71	1.35	中、外	近椭圆
	Ni-16	765.65	1493	30	0.92	25.52	23.43	内、中、外	不规则
	Pb-10	213.5	319	35	0.73	6.1	4.45	内、中、外	不规则
	Pb-13	874	874	35	0.53	24.97	13.12	内、中、外	近方形
	As-41	35.79	102	8	1.93	4.47	8.61	内、中、外	不规则
	As-43	59	59	8	0.25	7.38	1.82	内、中、外	近椭圆
	Au-59	8	17.6	2.5	0.34	3.2	1.07	内、中、外	近椭圆
	Au-61	15.26	18.3	2.5	1.4	6.1	8.53	内、中、外	不规则
	Au-64	6.36	13	2.5	0.76	2.54	1.94	内、中、外	不规则
	Bi-33	1.5	2.85	0.4	2.42	3.75	9.07	内、中、外	不规则
Hs18	Bi-35	1.73	4.78	0.4	1.49	4.33	6.47	内、中、外	不规则
	Bi-36	0.83	1.75	0.4	2.77	2.08	5.76	内、中、外	不规则
	Sn-26	3.7	6.38	2.5	1.47	1.48	2.17	中、外	不规则
	Sn-35	4.58	7.4	2.5	0.35	1.83	0.65	中、外	不规则
	Sn-39	3.26	5.13	2.5	0.28	1.3	0.37	中、外	不规则
	W-20	12.5	20.4	2	1.11	6.25	6.97	内、中、外	不规则
	W-23	11.9	17.8	2	0.36	5.95	2.16	内、中、外	不规则
	La-8	132.38	333	95	17.24	1.39	24.03	中、外	不规则
	Th-22	55.4	83.2	25	0.34	2.22	0.76	中、外	不规则
	Th-23	55.35	73.4	25	0.5	2.21	1.12	中、外	不规则
Hs21	Th-25	42.4	70.8	25	0.25	1.7	0.42	中、外	不规则
	Nb-17	18.63	29.9	15	13.34	1.24	16.57	中、外	不规则
	U-24	3.43	5	3	0.9	1.14	1.03	外	不规则
	Sn-40	3.61	5.6	2.5	2.19	1.45	3.16	中、外	不规则
	Ag-60	0.14	0.16	0.1	0.33	1.4	0.46	外	不规则
	As-56	16.66	101	8	31.7	2.08	66	内、中、外	不规则
	Au-78	13.5	13.5	2.5	0.22	5.4	1.2	内、中、外	不规则
	Au-83	13.21	25.5	2.5	0.34	5.28	1.77	内、中、外	近椭圆
	Au-84	65.2	65.2	2.5	0.31	26.08	8.09	内、中、外	近椭圆
	Bi-66	1.65	2.85	0.4	0.42	4.11	1.74	内、中、外	近椭圆
Hs26	Cu-29	65.7	81.4	30	0.21	2.19	0.47	中、外	不规则
	Cu-30	62.3	85.8	30	0.27	2.08	0.56	中、外	不规则
	Mo-27	1.16	1.3	1	0.38	1.16	0.44	中、外	不规则
	Sn-65	4.41	6.6	2.5	1.19	1.76	2.1	中、外	不规则
	Sn-70	5.16	7.11	2.5	0.37	2.06	0.76	中、外	不规则
	Zn-33	117.47	150	95	0.95	1.24	1.17	外	不规则
	W-43	4.68	5.25	2	0.68	2.34	1.58	中、外	不规则
	W-44	6.06	13.6	2	0.69	3.03	2.08	中、外	不规则

Anomaly characteristics of Hs17,Hs18,Hs21 and Hs26 of northern Helan Mountain

Hs18 anomaly of the Galasitai

The soil profile of Hs18 anomaly of the Galasitai

Anomaly of 1∶10 000 cuttings measurement of the Galasitai

Surface sampling plan of the Galasitai tungsten ore body

The Galasitai tungsten ore

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