摘要
沙特阿拉伯吉达东北部地区位于非洲—阿拉伯成矿区,矿产丰富,地质构造情况复杂,岩浆热液活动明显,多金属成矿作用极为发育,成矿潜力巨大。为进一步寻找该地区多金属矿床的成矿部位,圈定找矿远景区,利用Landsat8影像对该区进行线性-环形构造解译,运用“主成分分析-最优密度分割”方法提取铁化等矿化蚀变遥感异常信息;综合分析区内7个铁化蚀变区遥感影像的地质特征并筛选有利于成矿的线性-环形构造,基于上述特征对沙特吉达东北部地区成矿有利部位进行预测,圈定出3个找矿远景区;最后通过高分二号(GF-2)和GoogleEarth等高空间分辨率遥感影像对所圈定的找矿远景区进行了验证,进一步证明岩浆侵入的环形构造区及断裂交汇处是该区成矿的有利场所。研究成果可为该地区进一步找矿预测提供参考依据。
Northeastern Jeddah area of Saudi Arabia is located in Africa-Arab metallogenic area, which is characterized by rich mineral resources, complex geological structure and magmatic hydrothermal activities, thus having well-developed polymetallic mineralization and tremendous metallogenic potential. For the purpose of further prospecting for polymetallic areas and delineating favorable targets, the authors used the Landsat8 images to interpret linear-ring structures in the whole study area, and employed the “principal component analysis-optimal density segmentation” method by using iron mineralization alteration anomaly to extract polymetallic deposits. Based on the comprehensive analysis, the authors studied the remote sensing image geological characteristics of 7 iron mineralization alteration zones in the study area and selected favorable metallogenic linear-ring structures to predict the favorable location of prospecting in the northeastern Jeddah area of Saudi Arabia. Three iron prospective areas were delineated. GF-2 and Google Earth images were used to verify the prediction of metallogenic favorable sites in northeastern Jeddah of Saudi Arabia. The results obtained further prove that the magmatic intrusion in the annular tectonic zone and the fracture junction are favorable places for metallogenesis in the study area. The results obtained by the authors could provide the reference for the further prospecting prediction in this region.
作者
马鸿霖
贾伟洁
付长亮
李伟
MA Honglin;JIA Weijie;FU Changliang;LI Wei(China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083,China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《国土资源遥感》
CSCD
北大核心
2019年第3期174-182,共9页
Remote Sensing for Land & Resources
基金
中国地质调查局地质调查项目“‘一带一路’资源环境卫星遥感解译与应用”(编号:DD2016117)
国家重点研发计划项目“基于国产遥感卫星的典型要素提取技术”(编号:2016YFB0501404)共同资助
关键词
线性-环形构造
蚀变异常
最优密度分割
找矿预测
吉达东北部
linear-ring structure
alteration anomaly
optimal density segmentation
prospecting prediction
northeastern Jeddah
