GEOLOGICAL CHARACTERISTICS AND METALLOGENIC PREDICTION OF BEIERSHIJIAZI COPPER-GOLD DEPOSIT IN LIAONING PROVINCE
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摘要:
辽宁北二十家子铜金矿位于华北地台北缘的朝阳-赤峰金矿成矿带，区内多个蚀变岩型铜金矿（化）点受北西向、北东向断裂构造控制.土壤地球化学测量共圈定3类异常，其中Ⅰ类异常4处，Ⅱ类异常8处，Ⅲ类异常16处.在化探异常显示良好的区域进行了物探工作，其中物探高电阻率区域与化探Ⅰ类异常区重合，物探激电中梯和激电测深共圈定3个异常区、4个深部靶区.综合研究区内地质特征、地球物理特征及地球化学特征，认为硅化、黄铁矿化、黄铜矿化等热液蚀变矿物组合发育是重要的岩石矿物学找矿标志；古元古界宝音图群和花岗质片麻岩的接触部位，北西向、北东向构造蚀变破碎带，硫化物含量较高的区域是重要的找矿靶区.
Abstract:The Beiershijiazi Cu-Au deposit in Liaoning Province is located in Chaoyang-Chifeng gold metallogenic belt on the northern margin of North China Platform, where quite a few Cu-Au ore/mineralized occurrences of altered rock type are controlled by NW- and NE-trending faults. Three types of soil geochemical anomalies were delineated by soil geochemical survey, including 4 of I-type, 8 of II-type and 16 of III-type. Geophysical exploration is carried out in the areas with well geochemical anomalies, among which the high resistivity area of geophysical exploration coincides with the I-type anomaly area of geochemical exploration, and 3 anomaly areas and 4 deep targets are delineated by IP intermediate gradient and IP sounding. Based on the geological, geophysical and geochemical characteristics of the area, it is considered that the development of hydrothermal alteration mineral assemblages such as silicification, pyritization and chalcopyritization are key prospecting indicators of petromineralogy. The contact zone of Paleoproterozoic Baoyintu Group strata and granitic gneiss, NW- and NE-trending tectono-altered fracture zones, and high-sulfide areas are important prospecting targets.
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Key words:
- copper-gold deposit /
- alteration /
- pedogeochemistry /
- IP intermediate gradient /
- IP sounding /
- Liaoning Province
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表 1 化探综合异常一览表
Table 1. List of comprehensive geochemical anomalies
异常编号 异常面积/km2 元素组合 地质因素 Ⅰ-1 0.098 Zn-Pb-Mo-Au-Ag 片麻岩、变粒岩、板岩 Ⅰ-2 0.407 Zn-Pb-Cu-Au-Mo-As-Ag 花岗质片麻岩 Ⅰ-3 0.068 Cu-Au-Mo-Pb 片麻岩、变粒岩、板岩 Ⅰ-4 0.395 Cu-Pb-Sb-Ag-Zn-Mo-Au 片麻岩、变粒岩、板岩 Ⅱ-1 0.116 Zn-Cu-Au-Pb-Mo-Ag 花岗质片麻岩、变粒岩 Ⅱ-2 0.068 Sb-Zn-Cu-Au-Pb-Ag-Mo-As 花岗质片麻岩、变粒岩 Ⅱ-3 0.287 Pb-Cu-Au-Mo-Ag-Sb-As 片麻岩、闪长岩、花岗斑岩 Ⅱ-4 0.057 Cu-Au-Mo-Pb-Ag 片麻岩、变粒岩、闪长岩 Ⅱ-5 0.316 Cu-Au-Pb-Zn-Mo-Sb-As-Ag 片麻岩、变粒岩、复成分砾岩 Ⅱ-6 0.255 Au-Cu-Zn-Sb-Pb-As-Mo-Ag 片麻岩、变粒岩、花岗斑岩 Ⅱ-7 0.048 Cu-Pb-Mo-Sb-Ag-Au-Zn 片麻岩、变粒岩、花岗斑岩 Ⅱ-8 0.144 Mo-Au-Pb-Zn-Sb-As 花岗质片麻岩 Ⅲ-1 0.044 Au-Pb-Cu-Mo-As-Sb 花岗质片麻岩、变粒岩 Ⅲ-2 0.034 Mo-Zn-Ag-Pb 花岗质片麻岩、变粒岩 Ⅲ-3 0.037 Au-Zn-Mo 花岗质片麻岩 Ⅲ-4 0.034 Au-As-Mo-Sb 片麻岩、变粒岩 Ⅲ-5 0.015 Mo-Zn 花岗质片麻岩、变粒岩 Ⅲ-6 0.039 Mo-Sb-Pb-Au-As 花岗质片麻岩、变粒岩 Ⅲ-7 0.021 Pb-Au-Ag 复成分砾岩 Ⅲ-8 0.135 Pb-Au-Mo-Ag-As 花岗质片麻岩、变粒岩 Ⅲ-9 0.099 Mo-Pb-Cu-Zn-As-Au-Sb 花岗质片麻岩、二长花岗岩 Ⅲ-10 0.02 Mo-Pb-Zn-Cu-Au-Ag 花岗质片麻岩、二长花岗岩 Ⅲ-11 0.02 Cu-Pb-Sb-Mo-Zn-Ag-Au 花岗质片麻岩 Ⅲ-12 0.063 Pb-Au-Sb-As-Mo 花岗质片麻岩、变粒岩 Ⅲ-13 0.20 Cu-Au-Pb-As-Ag-Mo 花岗质片麻岩、变粒岩 Ⅲ-14 0.041 Cu-Pb-Ag-Mo-Au 花岗质片麻岩 Ⅲ-15 0.064 Mo-Au-Cu-Pb-Ag 花岗质片麻岩、闪长岩 Ⅲ-16 0.173 Sb-As-Au-Cu-Pb-Mo-Ag 花岗质片麻岩、变粒岩 
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表 2 研究区岩石电参数统计表
Table 2. Electrical parameters of different rocks in the study area
岩性 电阻率ρs/Ωm 极化率ηs/% 变粒岩、片岩 800~1200 0.50~1.40 大理岩 200~600 0.50~1.00 花岗质片麻岩 200~1000 4.00~8.00 大理岩中硅化蚀变岩 1800~2300 1.80~2.30 片岩变粒岩中硅化蚀变岩 1500~2000 1.00~1.40
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