EXTRACTION OF LINEAR STRUCTURE AND ALTERATION INFORMATION USING ASTER DATA AND PROSPECTING PROGNOSIS FOR TUDUN, HAMI
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摘要: 土墩铜镍矿位于东天山黄山—镜儿泉铜镍成矿带, 矿床形成主要受岩浆作用和构造作用控制。为了进一步探测该地区的矿产情况, 采用ASTER热红外波段比值组合模拟的反演算法, 对发射率数据进行SiO2含量的定量反演, 在反演图上识别出了研究区内明显的石英断裂带。结合ASTER数据可见光—近红外光谱波段中提取出的构造信息, 得出研究区完整的构造解译图。采用主成分分析和阈值分割法对研究区进行了铁染、羟基蚀变信息提取。最后根据区内线性构造、遥感蚀变信息、岩石分布特征、化探异常、已知矿床点分布资料综合分析, 圈定出6个成矿有利区, 为研究区今后的找矿勘查提供依据。
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关键词:
- SiO2含量的定量反演 /
- 构造提取 /
- 蚀变信息提取 /
- 找矿靶区
Abstract: Copper-nickel deposit of Tudun which is located on the Huangshan-Jingerquan copper-nickel mineralization belt in East Tianshan area is controlled by magmatism and tectonic action. To further prospect the minerals of this region, using thermal infrared data of Aster, the authors quantitatively retrieve SiO2 content in the rocks from emissivity data by inversion algorithm simulated from different band ratio combination. According to the inversion map view, we extract many large silicified fault zones. Combining with the information of the faults, based on visible -near infrared bands, we obtain the fracture distribution of the study area. Principal component analysis and threshold segmentation were used to enhance the spectrum and space information and extract the iron-stained and hydroxyl alteration information. Through comprehensively analyzing the linear structure, remote sensing alteration information, rock mass distribution characteristics, regional geochemical information and known deposits, six metallogenic prospective areas are delineated. -
图 1 研究区所在的大地构造环境(据邵行来等，2010，略修改)
Q—第四纪松散沉积层；E-N—新近系—古近系沉积层；J—侏罗系；P1—下二叠统；C2—上石炭统中深变质岩层；C1—下石炭统变质岩层；D1—下泥盆统火山岩-火山碎屑岩；Jx—蓟县系变质岩；Ch—长城系变质岩；δ-ν—镁铁-超镁铁岩；Cγ—花岗岩；Pξγ—钾长花岗岩；Cδ—闪长岩；Cν—辉长岩；1—深大断裂；2—韧性剪切带；3—泉；4—铜镍矿
Figure 1. Geographical map of Tudun, Hami, Xinjiang Province
图 3 研究区SiO2含量及硅化断裂带分布
Figure 3. Content figure of SiO2 and silicified fracture distribution in study area
图 7 哈密土墩找矿预测图
1—黑云母花岗岩；2—闪长岩；3—花岗闪长岩；4—镁铁-超镁铁岩；5—铁染蚀变异常区；6—铝羟基蚀变异常区；7—镁羟基蚀变异常区；8—断裂；9—硅质破碎带；10—铜镍矿床；11—铜元素化探异常区；12—金元素化探异常区；13—镍元素化探异常区；14—锑元素化探异常区；15—成矿远景区
Figure 7. Prediction map of mineral prospect in Tudun, Hami
表 1 Aster 1, 3, 4, 8波段的PCA统计
Table 1. PCA statistics of Aster 1, 3, 4, 8
主成分 Aster1 Aster3 Aster4 Aster8 PC1 0.370119 0.552816 0.609681 0.430923 PC2 0.699269 0.360828 -0.537939 -0.302404 PC3 -0.192114 0.161044 -0.578185 0.776440 PC4 0.580626 -0.733664 0.067913 0.346408 
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表 2 Aster 1, 4, 6, 7波段的PCA统计
Table 2. PCA statistics of Aster 1, 4, 6, 7
主成分 Aster1 Aster4 Aster6 Aster7 PC1 -0.374032 -0.647138 -0.457182 -0.481972 PC2 -0.926610 0.241041 0.220156 0.186614 PC3 -0.023652 -0.721276 -0.428192 0.543924 PC4 0.021855 -0.442569 0.860706 -0.250680
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表 3 Aster 1, 2, 3, 4波段的PCA统计
Table 3. PCA statistics of Aster 1, 2, 3, 4
主成分 Aster1 Aster4 Aster6 Aster7 PC1 0.362885 0.505763 0.533117 0.572979 PC2 0.469616 0.377160 0.162507 -0.781539 PC3 0.735924 -0.153289 -0.614046 0.240551 PC4 -0.325870 0.760563 -0.558860 0.055022
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