多源数据在西藏罗布莎铬铁矿床遥感找矿模型中的应用

遥感的快速发展,使其已成为地质研究和地质勘查强有力的技术手段。遥感找矿模型是建立在正确的遥感地质解译基础上,可以描述一类矿床一系列遥感地质找矿标志的信息。西藏罗布莎地区蕴含着我国最大的铬铁矿床,文章利用World View-2高空间分辨率遥感影像、ETM+对罗布莎铬铁矿床进行遥感控矿因素提取。通过对研究区成矿地质特征条件分析,结合收集的研究区物化探等多源资料,总结西藏罗布莎地区阿尔卑斯型铬铁矿床遥感地质找矿模型。研究结果表明,高空间分辨率遥感工作精度高,其技术在地质矿产调查工作中,尤其是在我国西部等条件艰难复杂环境下,能够发挥举足轻重的作用。同时应用该模型,能为今后在雅鲁藏布江蛇绿岩带上寻找类似铬铁矿床提供遥感依据。

Application of multisource data in remote sensing exploration model for chromite deposits in Luobusa area, Tibet

Remote sensing has become a strong technical mean for geological research and exploration. Remote sensing prospecting model is established on the basis of the correct remote sensing geological interpretation and can describe information about a series of remote sensing geological prospecting marks of a kind of deposits. The Luobusa ophiolite contains the largest known chromitite deposits in China. This paper takes advantage of WorldView-2 high spatial resolution remotely sensed data and ETM+ to extract ore-controlling factors in Luobusa. First analyzed the conditions of the ore-forming geological characteristics in the study area, second established the interpretation marks of high resolution remote sensing, including stratum, structure, rock mass. Besides, the ferric contamination anomaly has been extracted. And then collected geophysical and geochemical data in the study area. Finally summarized remote sensing geological prospecting model of alpine type chromite deposit in Luobusa. The results of the survey show that high spatial resolution remote sensing can play an important role in geological and mineral resources survey, especially in the difficult and complex environment. Meanwhile, according to the model, it will provide the basis for the future in the Yarlung Zangbo river ophiolite belt to find similar chromite deposit.