综合物探在崤山东部浅覆盖区勘查银多金属矿床中的应用

doi:10.11720/wtyht.2019.1422

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Abstract

According to the physical character difference between the exploration object geological body (silver polymetal-bearing structural alteration zone and granite porphyry mass) and the wall rock, the authors employed such integrated geophysical exploration methods as high-precision magnetic survey, IP intermediate gradient and IP sounding to prospecting for concealed silver polymetallic deposits in the shallow cover area of eastern Xiaoshan. High-precision magnetic survey was used to divide favorable prospecting targets, IP intermediate gradient method was utilized to delineate favorable ore-forming sectors of mineralization and alteration, and IP sounding was used to optimize drill hole layout. In this way, the ore-intersecting rate was increased, and important breakthrough was made in ore prospecting.

Key words： eastern Xiaoshan silver polymetallic ore high-precision magnetic survey IP intermediate gradient IP sounding

Received: 19 November 2018 Published: 25 October 2019

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	Bing-Kun BI
	Yun-Zhen CHANG
	Qiang SHI
	Sui-shui SHEN

Cite this article:

Bing-Kun BI,Yun-Zhen CHANG,Qiang SHI, et al. The application of geophysical exploration to prospecting for silver-lead-zinc deposits in shallow cover areas of eastern Xiaoshan[J]. Geophysical and Geochemical Exploration, 2019, 43(5): 976-985.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1422 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I5/976

Geological map of Zhonghe silver polymetallic mining area(modified according to reference [14])

岩矿石名称	标本块数	$极化率 / % 范围　　　　　　　平均值$		$电阻率 / (Ω · m) 范围平均值$
花岗斑岩	44	0.57~2.10	1.48	255~1680	744
安山岩	11	1.14~1.85	1.63	405~770	543
流纹岩	30	0.65~2.71	1.84	155~875	537
碎裂岩	21	0.70~2.01	1.61	102~845	534
矿化花岗斑岩	9	2.32~9.22	5.51	92~718	344
矿化安山岩	22	1.6~17.20	5.5	66~654	399
矿化碎裂岩	9	2.03~11.36	3.55	226~524	394

Statistical table of electrical parameters of rock (ore)

岩石类别	岩矿石名称	标本块数	$κ / 10 - 6 4 π (SI) 变化范围　　　　　均值$		$M r / (10 - 3 A · m - 1) 变化范围　　　　　均值$
沉积岩	黄土	315		265		39
沉积岩	砂岩、砾岩	110	微磁		微磁
中性岩	闪长岩	104		3340		300
	闪长玢岩	34		3410		618
	石英闪长岩	4		6500		480
	石英脉、矿化石英脉	45		0		0
基性岩	辉长岩	53	260~12000	2420	240~50400	1420
酸性岩	花岗岩	78		540		80
	花岗斑岩	38	22~621	234	68~984	485
	二长花岗岩	57		2660		260
碱性岩	正长岩	244	260~20000	725	82~8400	510
	正长斑岩	231	0~5650	1065	0~2780	270
	石英正长斑岩	36		0		0
火山岩	流纹(斑)岩	11	微磁		微磁
	英安(斑)岩	18		900		37
	安山岩	1273 396	0~9300	1061 7680	0~9150	453 7500
	安山玢岩	204 49	130~5840 多为弱磁	7400	2000~9000	7000
	杏仁状安山玢岩	396	10000~20000		1000~2100
	片理化安山玢岩	49		4500		1400
构造岩	碎裂岩	17	23~416	164	146~964	701
	蚀变安山(玢)岩	14		1170		230
	蚀变花岗斑岩	35	0~75	29	0~56	24
矿石	赤铁矿	61		527		408
	黄铁矿	10		0		0
	磁铁矿	491	520~139000	49700	500~128000	14500
	褐铁矿	11		80		180
	磁铁赤铁矿	42	1300~9500	5665	1070~3500	2335
	磁铁石英岩	53	2470~48300		289~19200
	银铅锌矿	19	52~355	124	143~1063	598
	银铅锌矿化花岗斑岩	12	40~243	137	137~792	369

Statistical table of magnetic parameters of main rocks (ore)

1:50000 high-precision magnetic measurement ΔT anomaly map in the shallow coverage area of eastern Xiaoshan

Plan of the contour of the 300m contour of the 1:50,000 magnetic anomaly in the shallow coverage area of eastern Xiaoshan

Section diagram of apparent polarization in IP in Zhonghe silver polymetallic mining area

Comprehensive geological and geophysical sections of No.0 exploration line in Zhonghe silver polymetallic mining area

Comprehensive geological and geophysical sections of No.8 exploration line in Zhonghe silver polymetallic mining area

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