新疆甜水海地区遥感地质解译及蚀变异常信息提取

Remote Sensing Geological Interpretation and Alteration Anomaly Information Extraction in Tianshuihai Area in Xinjiang

新疆甜水海地区平均海拔高度在5 000 m以上,具有较好的遥感地质找矿前提。通过对遥感数据进行预处理与增强处理,建立了遥感地质解译标志,解译出了丰富的地质信息(地层、构造、岩浆岩);采用"掩膜+主成分分析+密度分割"方法,以ETM+数据作为数据源,提取了矿区铁染和羟基蚀变异常信息,并与已有地质资料进行了对比验证,发现有多金属化探异常及部分矿点与蚀变带重合。结合上述地质解译信息及各类蚀变信息,对矿区进行了成矿预测,圈定了苦水海—肖尔克谷地、红山湖—肖尔克谷地、长红山—通天桥3处找矿远景区,可为该区后续找矿勘查工作提供有益参考。

The average altitude is higher than 5 000 m in Xinjiang Tianshuihai Area,which provide a good premise for remote sensing geological prospecting.Trough the pre-processing and enhancement of remote sensing data,the remote sensing geological interpretation sings are established,and abundant geological information （strata,structure and magmatic rock） are obtained;then,the ＂mask＋principal component analysis （PCA） ＋density segmentation＂method is adopted and ETM＋ data is used to extract the alteration anomaly information of iron dyeing and hydroxy,by comparision and verification with the existing geological data,it is found that there are polymetallic geochemical anomalies and some ore spots coincide with the alteration information.Based on the above study results,the metallogenic prediciton work of the area is done,and three prospecting prospect areas （Kushuihai-Xiaoerke Valley,Hognshanhu-Xiaoerke Valley and Changhongshan-Tongtianqiao） are delineated,which can provide reliable for the further prospecting work in the area.