Geochemical Anomaly Characteristics and Prospecting Potential of Gold Polymetallic Deposits in Sanchahebei Area, Qinghai Province
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摘要: 三岔河北金-多金属矿位于东昆仑多金属成矿带中段，区内矿化主要赋存于青办食宿站组与沙松乌拉组之间的接触带，矿化富集受北西西向断裂构造控制的特征明显，围绕北西西向断裂构造带是寻找金矿化最直接的标志。区内金矿化的主要含矿岩性为构造蚀变岩，铜多金属矿化的主要含矿岩性为千枚状板岩、大理岩。通过在三岔河北地区3处以Au、Sn、Mo为主的1：5万水系沉积物异常靶区（HS乙316、HS乙324、HS乙239）内实施1：1万土壤测量、槽探、钻探工程，圈定出破碎蚀变带4条（Sb1、Sb2、Sb3、Sb4）、2条金矿化体（MⅠ-1、MⅢ）、5条多金属矿（化）体（MⅠ-2、MⅡ、MⅣ、MⅤ、MⅥ）。通过1：20万水系沉积物测量-1：5万水系沉积物地球化学测量-1：1万土壤地球化学测量-地质及工程验证的化探综合找矿方法，不断缩小找矿靶区，取得了较好的找矿效果。其中，Sb1、Sb3破碎蚀变带为构造蚀变岩型金矿，Sb2、Sb4破碎蚀变带为与黑色岩系有关的钒钼矿及伴生铂族矿。通过进一步的工作，有望寻找出一定规模的与黑色岩系有关的钒钼矿及伴生铂族矿床和构造蚀变岩型金矿床。综上所述，本区具有优越的成矿地质条件，化探异常发育，且已发现了较好的银多金属矿找矿信息，充分展示出本区具较大的找矿潜力，通过进一步工作，有望取得较好的找矿成果。Abstract: The Sanchahebei gold polymetallic deposit is located in the middle part of East Kunlun polymetallic metallogenic belt, and the mineralization in this area was mainly occurred in the contact zone between Qingbanshisu group and Shasongwula group. This mineralization was controlled by the NWW-trending fault, which is the most direct sign for prospecting gold mineralization. The gold mineralization is related to tectonic altered rock, while the copper polymetallic mineralization is related to phyllitic slate and marble in this mining area. After carrying out 1:10000 soil survey, trenching and drilling engineering in the three Au, Sn and Mo anomaly target area (HS乙316、HS乙324、HS乙239) of 1:50000 stream sediment, we marked out four fragmentation and alteration zones (Sb1, Sb2, Sb3, Sb4) and two gold mineralization bodies (MⅠ-1, MⅢ), five polymetallic bodies (MⅠ-2, MⅡ, MⅣ, MⅤ, and MⅥ). Through using the comprehensive prospecting method of 1:200,000 stream sediment measurement, 1:50,000 stream sediment geochemical survey, 1:10,000 soil geochemical survey geological and engineering verification, the ore prospecting target area has been narrowed continuously, and a good ore prospecting effect has been achieved. Among them, the fracture alteration type Au deposit has been found in Sb1 and Sb3 fragmentation and alteration zone, the vanadium, molybdenum deposits and associated platinum group deposits that related to black rock series have been discovered in Sb2 and Sb4 fragmentation and alteration zone. If the further work will be carried out, it is expected to find a certain scale of vanadium, molybdenum deposits and associated platinum group deposits that related to black rock series, as well as fracture alteration type Au deposit. In conclusion, the Sanchahebei area has excellent metallogenic geological conditions and developed geochemical anomalies, where has found good prospecting information for silver polymetallic deposit, showing that this area has a large ore prospecting potential and is expected to achieve good ore prospecting results by carrying out further work.
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Key words:
- Stream sediment survey /
- Soil survey /
- Geochemical anomaly /
- Gold polymetallic deposit /
- Sanchahebei /
- Qinghai Province
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