扎西康锌多金属矿床外围遥感找矿预测

Remote Sensing Prospecting Prediction of the Peripheral in Zhaxikang Zn-polymetallic Deposit

运用ENVI遥感图像处理软件,对藏南扎西康锌多金属矿床外围地区ETM+遥感图像采用比值法、特征主成分分析技术进行图像处理。首先对遥感图像进行波段组合、辐射校正和几何校正。选取ETM+1、4、5、7波段组合进行主成分分析,用TM+5/TM+7取代TM7,提取羟基蚀变信息;选取ETM+1、3、4、5波段组合进行主成分分析,用TM+5/TM+1替换TM+5,提取铁染蚀变信息;并通过目视进行遥感矿产地质特征解译,解译出线状、环状及带状要素。综合分析羟基蚀变信息、铁染蚀变信息、遥感矿产地质特征解译结果及矿区已有的地质资料,根据矿体由张扭性构造控制这一特征,通过与湖南香花岭锡多金属矿床对比分析,推测其深部有锡矿化体存在可能。故圈定5个找矿远景区,为扎西康矿床外围地区进一步矿产勘查提供有利的科学依据。

The ETM ＋ remote sensing images of the peripheral of Zhaxikang Zn-polymetallic deposit are processed by adopting the ratio method and the principal component analysis method based on the ENVI remote image processing software. Firstly, methods of band combination, radiometric and geometric correction are used to deal with the remote sensing images. Band of ETM ＋ 1 ,4,5,7 are selected to analyze the principal component and the TM ＋ 5/TM ＋ 7 replaced TM7 so as to extract the hydroxyl alteration information. In order to obtain the iron alteration information ,band of ETM ＋ 1,3,4,5 are chosen to make the principal component analysis and the TM ＋ 5/TM ＋ 1 replaced TM ＋ 5. Then, the linear, ring and ribbon elements are visually interpreted from the remote sensing images. Finally, the hydroxyl alteration information, the iron alteration information , the interpretation of remote sensing geological feature and the existing geological data of mining area are analyzed comprehensively. Due to the feature that orebodies are controlled by a shear structure, it is inferred that Sn oerbody maybe exist in the deep by comparative analysis of Xianghualing Sri-polymetallic deposit in Hunan. Therefore, five perspective ore prospecting areas are delineated for the sake of providing some scientific basis for the future prospecting in the peripheral Zliaxikang Zn-polymetallic deposit.