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| A discussion on the characteristics of magnetic anomaly and ore-prospecting orientation in Dashui gold concentration area of south Gansu Province |
| Bo ZHANG, Han-Ren TENG, Yi XU |
| No.2 Geology and Mineral Exploratian Team,Gansu Province Bureau of Geology and Mineral Exploration and Development,Lanzhou 730020,China |
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Abstract The resource extent of gold is diminishing with thirty years of continuous mining in Dashui gold concentration area of south Gansu Province. In order to obtain a new breakthrough in prospecting in the periphery and deep of the Dashui gold concentration area, 1:50 000 high-precision magnetic measurement of the ground was implemented. With the help of 1:50 000 high accuracy ground magnetic measurement and 2.5D human-computer interaction inversion, the author delineated the geomagnetic field anomalies in the study area and the precision section is explained. The author analyzed the characteristics of magnetic anomalies and the relationship between magnetic anomalies and gold deposits and explained the reasons for the abnormal formation. In addition, the author also summarized the geophysical prospecting signs in the study area. Finally, with the help of the stream sediment survey and geological mapping, the author predict the potential ore-prospecting area and newly discovered gold resources of 10 tons. It shows that magnetic survey is effective in prospecting in the Dashui gold concentration area and the distribution range of acid intrusive reflected by magnetic anomalies is favorable area for exploration of gold deposits.
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Received: 25 October 2017
Published: 24 October 2018
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| 岩(矿)石名称 | 标本块数 | 磁化率/(10-5SI) | 备注 | | 最小 | 最大 | 平均 | | 灰岩 | 162 | 0 | 3 | 0 | | | 二长花岗岩 | 24 | 218 | 410 | 300 | 忠格扎拉岩体 | | 辉长闪长岩 | 11 | 1568 | 1773 | 1662 | 忠格扎拉岩体 | | 正长斑岩 | 12 | 461 | 801 | 669 | C2异常区 | | (黑云母)闪长玢岩 | 52 | 62 | 125 | 75 | 格尔括合岩体 | | 花岗闪长岩 | 64 | 7 | 35 | 18 | 格尔括合岩体 | | 闪长岩 | | | | 1513 | 据参考文献[5] | | 花岗岩 | | | | 700 | 据参考文献[5] |
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| 编号 | | 价值
分类 | 水系沉积物测量 | 地磁测量 | 矿种 | | 异常编号 | 元素组合 | | A(1) | 3.437
8.630 | 甲2
甲1 | HS-9
HS-10
HS-8 | Au、As、Sb、Hg、W、Ag
Au、As、Sb、Hg、W、Ag
Sn、Cr、Pb、Rb、Mo | C5、C6磁异常 | Au | | A(2) | 4.044 | 甲2 | HS-2 | Au、As、Sb、Hg、W、Ag
Pb、Zn、Mo、Cd、Rb | C1异常南部边缘 | | | B(1) | 4.487 | 乙3 | HS-1 | Au、As、Sb、W、Ag
Pb、Cd、Co、Sn、Ni | C1异常西部边缘 | | | B(2) | 1.068 | 乙3 | HS-5 | Au、As、Sb、Hg、W、Mo、Cd | C1异常东南边缘 | | | B(3) | 6.336 | 乙2 | HS-6 | Au、As、Sb、Hg、W、Ag
Pb、Cd、Co、Mo、Ni | 磁异常较弱 | |
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