综合物探方法在云南澜沧老厂多金属矿区深部找矿中的应用

doi:10.11720/wtyht.2023.1578

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Abstract

Laochang, Lancang, Yunnan is one of the most important polymetallic mining areas in the southern part of Sanjiang Tethys metallogenic belt. After years of mining, the shallow resources are nearly exhausted. In recent years, granite porphyry and porphyry polymetallic mineralization have been newly discovered in the deep part of the mining area, highlighting the prospecting potential of deep polymetallic deposits. In order to trace the occurrence of deep ore-controlling strata and structures in the study area and help to make a breakthrough in deep ore prospecting, high-power induced polarization method and audio magnetotelluric method were implemented to image the deep structure situated. Results obtained from the inversion of the measured induced polarization and electromagnetic data recuperated the distribution of induced polarization anomalies and the characteristics of deep electrical structure within the study area. Combined with the available regional geological settings, the main conclusions are as follows: The low resistance and high polarization anomalies in the northwest of the survey area are deeply related to the surface ferromanganese, silver manganese, and deep polymetallic mineralization, and the high resistance and high polarization anomalies in the middle and east of the survey area are in good agreement with the deep polymetallic mineralization. The upper Carboniferous limestone and dolomite strata are thick in the west and thin in the east, with the west strata dipping to SW and the east strata overlying the Yiliu Formation of the lower Carboniferous. The concealed granite porphyry dips in NE direction, and the coupling part between its deep 2 300~2 800 m horizontal section and deep fault is a favorable area for deep polymetallic mineralization. Notably, joint interpretation yielded from the high-power induced polarization method and the audio magnetotelluric method applied improved the reliability of deep polymetallic ore detection and provided more information of positioning the subsequent drilling layout.

Key words： Laochang polymetallic mining area high-powerinduced polarization audio frequency magnetotelluric comprehensive geophysical prospecting deep ore prospecting

Received: 22 November 2022 Published: 05 July 2023

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	Yue-Xin YOU
	Ju-Zhi DENG
	Hui CHEN
	Hui YU
	Ke-Ning GAO

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Yue-Xin YOU,Ju-Zhi DENG,Hui CHEN, et al. Application of integrated geophysical methods in deep ore prospecting of Laochang polymetallic mining area in Lancang, Yunnan[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 638-647.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1578 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/638

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Regional geological sketch of Lancang Area, Yunnan Province (modified from reference[3])

分层代号	主要岩性	含矿性	旋回划分
$C 18$	凝灰岩、沉凝灰岩	含矿	Ⅲ
$C 18$	火山角砾凝灰岩	含矿
$C 17$ β	玄武岩
$C 17$ β	熔结凝灰岩	含矿
$C 1 5 + 6$	凝灰岩、沉凝灰岩	主矿层	Ⅱ
$C 14$	凝灰角砾岩		Ⅱ
$C 13$ α	集块岩		Ⅰ
$C 13$ α	安山岩
$C 12$ β	玄武岩
$C 12$ β	熔结角砾岩
$C 11$	熔结角砾岩
$C 11$	安山质凝灰岩

Lithology and cycle division of volcanic rocks in Laochangmining area

地层	标本数	岩(矿)石名称	电阻率ρ/(Ω·m)		极化率η/%
地层	标本数	岩(矿)石名称	变化范围	几何均值	变化范围	几何均值
$C 2 + 3 1 + 2$ 、 $C 18$ 、 $C 17$	10	铅锌矿(含黄铁矿)	2~34	5.5	10.25~58.81	24.10
C₂₊₃	3	铁锰矿石(有裂隙含褐铁矿较多)	3~16	7.3	1.27~2.94	11.30
C₂₊₃	4	锰矿石	480~776	604	8.9~13.2	1.83
$P 12$	5	泥晶灰岩	191~401	248	0.21~0.39	0.26
$P 11$	6	白云质灰岩	1048~4265	1827	0.48~1.52	0.81
$C 2 + 3 3$	6	珊瑚灰岩	1171~3790	1908	0.43~0.76	0.53
$C 2 + 3 1 + 2$	9	白云质灰岩	1064~2947	1893	0.19~0.59	0.35
$C 18$	10	沉凝灰岩	119~841	327	0.49~2.94	1.81
$C 17$	2	玄武岩	1492~1985	1765	1.34~6.0	3.10
	3	玄武质凝灰岩	392~990	678	0.28~1.46	0.66
	5	玄武质凝灰岩(含铅锌矿、黄铁矿)	82~110	95	5.46~10.67	7.63
$C 1 5 + 6$	13	粗面安山质凝灰岩(富含黄铁矿、黄铜矿)	6~205	65	7.01~38.39	16.10
$C 1 5 + 6$	4	粗面玄武质硅化凝灰岩	796~1675	1083	1.45~2.16	2.14
$C 14$	12	安山质凝灰角砾岩(含黄铁矿)	25~196	56	6.38~23.88	13.10
$C 13$ α	4	安山质集块岩、凝灰角砾岩(含黄铁矿)	49~84	70	7.31~18.51	10.65
$C 12$ β	15	玄武岩、玄武质熔结角砾岩	281~2911	642	0.4~8.01	2.33
D₁	7	石英砂岩	480~2247	944	0.74~2.04	1.22
$C 12$ ~ $C 18$ (按火山岩是否含矿分别统计)	31	含矿火山岩(玄武质凝灰岩、粗面安山质凝灰岩、安山质凝灰角砾岩)	6~205	63.7	5.46~38.39	13.40
$C 12$ ~ $C 18$ (按火山岩是否含矿分别统计)	36	火山岩(凝灰岩、玄武岩、集块岩、熔结角砾岩)	203~2911	647	0.28~8.01	1.82

Electrical parameters of rock (ore) in Laochang mining area

Distribution map of high-power induced polarization sounding and AMT survey stations in the study area

Distribution of apparent polarizability in induced polarization intermediate gradient of study area

Distribution of apparent resistivity in induced polarization intermediate gradient of study area

Inversion results of measured induced polarization soundingin data in the study area
a—measured data of CS1;b—measured data of CS2;c—measured data of CS3;d—inversion result of CS1;e—inversion result of CS2;f—inversion result of CS3

Comprehensive geophysical interpretation
a—2D inversion results of AMT;b—interpretation model

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