新疆北山裂谷带铁染蚀变特征及其找矿意义  

Characteristics of iron stain alteration and its prospecting significance in Beishan rift zone,Xinjiang

作　　者：吴纪宁 胡琳琛 WU Jining;HU Linchen(Northwest Geological Exploration Institute,China Metallurgical Geology Bureau,Xi'an 710119,Shaanxi,China;Xinjiang Xinghongtai Co.,Ltd.,Altay 836599,Xinjiang,China)

机构地区：[1]中国冶金地质总局西北地质勘查院,陕西西安710119 [2]新疆兴宏泰股份有限公司,新疆阿勒泰836599

出　　处：《矿产与地质》2021年第4期817-822,共6页Mineral Resources and Geology

摘　　要：新疆北山裂谷带气候恶劣、地形复杂,为改善人工找矿效率低下的情况,研究利用遥感技术构建了控矿地质条件和蚀变异常信息的找矿模型。首先使用主成分分析法和波段比值法提取经过处理的新疆北山裂谷带遥感影像内的铁染蚀变异常信息。综合遥感信息和铁染蚀变特征,筛选出铁染蚀变异常套合较优的区域,圈定找矿有利区。最终圈定了3个白洼地有利找矿靶区,主要分布在白地洼—淤泥河断裂带的上中下部,并且沿石炭系红柳园组分布。圈定的3个靶区中已证实其中一个靶区含有铁矿,说明综合遥感影像和铁染蚀变信息的找矿模型可为矿产勘查提供一定实际指导。Beishan rift zone in Xinjiang has the harsh climate and complex terrain.In order to improve the low efficiency of artificial prospecting in Beishan rift zone of Xinjiang,the prospecting model of ore-controlling geological condition and alteration anomaly information is established by using remote sensing technology.Firstly,principal component analysis(PCA)and band ratio(WBR)methods are used to extract the iron stain alteration anomaly information from the processed remote sensing image of Beishan rift zone in Xinjiang.Based on the remote sensing information and the characteristics of iron stain alteration,the areas with better combination of iron stain alteration are screened out and the favorable prospecting areas are delineated.Finally,three favorable prospecting target areas are delineated,which are mainly distributed in the upper,middle and lower parts of the Baidiwa-Yunihe fault zone along Carboniferous Hongliuyuan formation.One of the three delineated target areas has been confirmed to contain iron ore occurrence.It is indicated that the prospecting model integrating remote sensing image and iron stain alteration information can provide a practical guidance for the mineral exploration in this area.

关 键 词：遥感 铁染蚀变 找矿模型 白地洼 新疆北山裂谷带 

分 类 号：P627[天文地球—地质矿产勘探]