Prospecting Potential Analysis of M1 Magnetic Anomaly Based on The Geophysical in Gemalong Ag Polymetallic Deposit, East KunLun, QingHai Province
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摘要:
各玛龙银多金属矿位于青海省东昆仑成矿带东段，目前处于普查阶段。矿区内已发现8条含矿蚀变带和圈定27条银多金属矿体，目前累计估算银推断资源量银320.4 t，金0.5 t，铅＋锌
1229.47 t。矿区东南角存在1处1∶10000 地磁异常M1，区内已发现的含矿蚀变带围绕M1磁异常呈环状分布，M1磁异常与成矿的关系一直未受重视。本次通过磁法、激电、可控源测深等物探方法运用，通过面上、垂向元素、矿化、蚀变分带的分析，认为M1磁异常是由深部隐伏的花岗闪长斑岩体引起，该岩体为地表浅成低温热液型银多金属矿床的成矿物质和热液来源，M1磁异常具备寻找斑岩型矿的潜力。Abstract:The Gemalong Ag polymetallic deposit located in the East Kunlun metallogenic belt, Qinghai Province. Eight ore-bearing alteration zones and 27 Ag polymetallic orebodies have been identified in the Gemalong mining area. The estimated resources of Ag, Au, and Pb+Zn are 320.4 t, 0.5 t, and
1229.47 t, respectively. There is a geomagnetic anomaly M1 (1∶10,000) in the southeast mining area, and the ore-bearing alteration zones have been found in a circular distribution around M1 magnetic anomaly. However, the relationship between M1 magnetic anomaly and mineralization has not been paid attention to. This time through the magnetic method, IP, controllable source sounding and other geophysical methods used, based on the analysis of surface and vertical elements, mineralization and alteration zoning,think that M1 magnetic anomaly is caused by sulfides from granodiorite porphyry, which is the metals and fluids sources of epithermal mineralization in this area. The M1 magnetic anomaly is similar to the magnetic anomaly caused by porphyry deposits, which suggests the potential for porphyry mineralization.-
Key words:
- Qinhai Province /
- Gemalong /
- Ag polymetallic deposit /
- prospecting potential analysis /
- magnetic anomaly
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表 1 各玛龙地区磁性参数特征一览表
Table 1. List of magnetic parameter characteristics in Gemalong mining area
岩性 磁化率κ范围 （10−6×4π·SI） 磁化率κ平均值 （10−6×4π·SI） 剩磁范围Jr （10−3A/m） 剩磁Jr平均值 （10−3A/m） 英安岩 32.71～ 1061.65 261.48 5.85～350.42 85.2 安山岩 2.17～112.31 43.26 1.33～439.35 84.18 二长花岗岩 6.77～31.50 31.50 4.49～67.19 16.19 流纹岩 0.22～48.73 23.09 3.73～16.25 7.45 闪长岩 13.57～86.26 13.57 4.39～22.23 8.09 火山角砾岩（岩心） 2.87～24.71 11.54 1.70～12.52 6.28 晶屑凝灰岩 13.03～81.39 39.21 3.53～16.95 9.35 花岗斑岩 5.2～41.19 22.01 4.88～12.09 8.90 银金矿石 0.12～33.76 18.69 4.43～15.55 9.56 花岗闪长斑岩 384.36～931.06 512.48 1.63～27.81 11.63 
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表 2 钻孔岩心磁性参数特征一览表
Table 2. List of magnetic parameter characteristics in drill
岩性 位置 标本数（块） 磁化率κ范围 （10−6×4π·SI） 最小值 最大值 平均值 黄铜矿化、磁黄铁矿化
花岗闪长斑岩QZ003钻孔34.35～96.3 m 11 302.39 1209.58 621.79 碎裂岩 QZ003钻孔96.3～103.65 m 7 177.46 651.74 322.4 晶屑凝灰岩 QZ003 11.74～14.45 m， 103.65～140 m 17 28.57 473.49 207.39 火山角砾岩 QZ002 20.35～80 m 32 177.46 651.74 322.4
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