Lineaments and Their Controls of Gold Mineralization in Tulasu Area, Xinjiang, China
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摘要: 采用多种数值图像进行线性构造解译, 其中DEM和NOAA主要用于区域尺度, TM用于勘探区尺度, 地面磁法数据用于靶区范围的解译分析. 研究认为该区线性构造与金矿床的空间分布关系密切, 表现为: (1)区域尺度的一级控矿构造为NEE、NE和NW向构造的交汇部位; 吐拉苏地区的一级控矿构造为WNW和NNW及NE方向构造的交汇部位; (2)吐拉苏地区的次级控矿构造为NNE和环形构造的交汇部位; (3)靶区的一级控矿构造为NE、SN和环形构造. 线性构造异常分析结果显示, 当线性构造的优益度大于40时, 有较大的成矿可能性.Abstract: On the basis of lineament interpretation of DEM, TM, NOAA and ground magnetics, this study suggests that lineaments spatially coupled with gold deposits distribution. At regional scale, the first-order structural controls are NEE, NE and NW trending structures, particularly at their intersecting sites. At project scale, the first-order structural controls are WNW, NNW and NE structures, and the second-order structures are NNE and ring structures. At prospect scale, the NE, SN and ring structures are the most important structural controls. There is great potential of gold targets when the advantageous of lineament anomaly are higher than 40 at project scale.
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Key words:
- lineament interpretation /
- gold deposit /
- structural control /
- target-prospecting /
- Tulasu /
- Xinjiang
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图 1 新疆吐拉苏地区地质略图
1. 土壤覆盖; 2. 沉积盖层; 3. 石炭系火山岩; 4. 奥陶系灰岩; 5. 元古宙基底; 6. 斑岩; 7. 花岗岩; 8. 金矿; 9. 铅锌矿; 10. 阿希金矿
Fig. 1. Geological sketch map of the Tulasuarea, Xinjiang
图 2 天山地区的主要线性构造②
1. 元古代线形构造; 2. 古生代线形构造; 3. 中生代—新生代线形构造; 4. 主要金矿床
Fig. 2. Major lineaments of the Tianshan orogen interpreted from DEM ②
图 3 吐拉苏地区的主要线性构造
Fig. 3. Major lineaments of the Tulasu area, Xinjiang, interpreted from TM, MSS, NOAA and ground magnetic survey results
图 4 吐拉苏地区线性构造分形特征
n. 含有线形体的盒子数; a. 区域范围; b. 吐拉苏地区
Fig. 4. Box-counting curves for interpreted lineaments
图 5 吐拉苏地区线性构造异常优益度等值线(基于图 3, μ=0. 6, 可信度阀值)
Fig. 5. Contour map of lineament advantageous in the Tulasu area
表 1 用于计算优益度的线性体权重
Table 1. Weights of lineaments used for advantageous calculation
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