朱拉扎嘎金矿区地物光谱特征与地球化学成分之间的关系  

Relationship between spectral characteristics and geochemical composition of Zhulazhaga gold deposit

作　　者：丛丽娟[1] 岑况[2] 余学中[1,2] 黄增芳[3] 冷福荣[3] 

机构地区：[1]中国国土资源航空物探遥感中心,北京100083 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]内蒙古自治区地质调查院,内蒙古呼和浩特010020

出　　处：《中南大学学报（自然科学版）》2013年第1期266-274,共9页Journal of Central South University:Science and Technology

基　　金：内蒙古自治区政府科研基金资助项目(05-6-YS2)

摘　　要：利用卫星数据和地面光谱测试数据研究地物光谱特征与地球化学成分之间的关系。利用美国陆地卫星Landsat-7的ETM+数据提取研究区的蚀变异常,与区域地球化学水系沉积物测量结果进行关联分析;利用美国光谱分析设备ASD(ASD:FieldSpec-FR),对矿区岩石样品进行光谱测试,提取特征参数并与其化学成分进行对比分析。研究结果表明:卫星数据提取的蚀变异常和化探近矿指示元素Au和Cu等异常空间分布趋势一致;地面光谱测试数据中特征参数H900与Au,Cu,As,Bi,W,Mo和Fe2O3等矿化指示元素具有二次曲线函数的定量关系,这说明在干扰因素少的实验室环境内岩石光谱特征和矿化指示元素之间可以建立定量关系,这种关系支持遥感地球化学测量的开展;现有遥感数据虽不能和矿化指示元素的地球化学异常建立定量关系,但与部分指示元素有很好的相关性,因此,随着遥感技术的发展,遥感数据波段的增加以及去干扰能力的增强,遥感数据也能更精确地反演地物化学成分信息,实现遥感地球化学测量。Using the satellite remote sensing （RS）data and ground spectrum data, the relationship of spectrum characteristics and geochemistry composition in Zulazhaga gold deposit was studied. The alteration anomalies from ETM＋ of landsat-7 were extracted, and then the relationship between the alteration anomalies and the regional geochemistry stream sediment survey results was studied. The ground spectrum data were tested by Analytical Spectral Devices （ASD） FieldSpec-FR and the key parameter was extracted and compared to the chemistry composition of the sample. The results show that in the Zhulazhaga gold deposit, the distribution of alteration anomalies from ETM＋ is similar to Au and Cu geochemistry anomalies, which are index elements near the deposit. The absorb depth parameter in ground spectrum of 900 nm （H900） is related quantitatively in a square curve function to composition of Au, Cu, As, Bi, W Mo, Fe203, etc, which are the main ore-forming indicator elements. That means, in laboratory, with little or nor interference factor, there are quantitative relationship between the high-precision ground spectrum data and thegeochemistry composition. These results support RS-geochemistry measure to be carried out. Relationship between RS-data and geochemistry indicator elements cannot be found, but it can be forecast that with the RS development, including the increase of RS band number, enhancement of the elimination of interference factor ability and so on, the RS data can also inverse ground object geochemistry composition information and realize geochemistry survey.

关 键 词：ETM+数据 遥感蚀变异常 光谱特征 化探异常 朱拉扎嘎金矿 内蒙古 

分 类 号：P627[天文地球—地质矿产勘探] P632[天文地球—地质学]