利用 ASTER 传感器提供的光谱数据,锁定摩洛哥中央丘陵埃兹日利加地区的高潜力矿产远景

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Younesse EL Cheikh , Ahmed Attou , Lahsen Achkouch , Younes Mamouch , Toufik Khouya , Adama Sangare , Abdelhalim Miftah
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引用次数: 0

摘要

本研究论文介绍了一种综合方法,用于评估位于摩洛哥海西中央丘陵的埃兹日利加地区的热液蚀变区和结构复杂性。该方法利用 ASTER 图像作为主要数据源。主要目标是识别和分析这些地质特征,然后通过整合模糊逻辑和分形集中区域分析,绘制矿产勘探潜力图。利用波段比(RBD)和主成分分析(PCA)来检测和绘制霰粒岩、植酸岩、丙炔岩和氧化铁蚀变带。此外,还从 PC1 图像中提取了构造线型,以了解勘测区域的构造模式。热液蚀变区和构造线状线是通过应用模糊逻辑模型实现的,最终生成了矿物有利度图。对模糊逻辑模型进行了定制,将热液蚀变和构造线密度图结合起来,有效消除了各种干扰因素引起的虚假光谱异常。然后使用分形集中区(C-A)模型对该地图进行分析,将异常与地质背景分离,生成最终的矿产潜力地图。利用分形集聚区分析可以更精确地确定阈值,从而提高矿产远景评估的可靠性。此外,还进行了实验室分析,以验证矿产潜力图的结果。获得的结果显示与实地数据有很大的相似性,并表明高远景区的空间范围非常有限,一般与 Zaër 花岗岩柱岩与变质主岩的接触有关,但在研究区东南部沿东北-西南走向的主要断层发现的异常除外。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Targeting high-potential mineral prospects in the Ezzhiliga region, Moroccan central massif, using spectral data from the ASTER sensor

This research paper introduces a comprehensive methodology for assessing hydrothermal alteration zones and structural complexity in the Ezzhiliga region, situated in the Hercynian Central Massif of Morocco. The approach utilizes ASTER imagery as the primary data source. The main objectives were to identify and analyze these geological features and then create a potential map for mineral exploration by integrating fuzzy logic and fractal concentration area analysis. Band ratios (RBD) and principal component analysis (PCA) were employed to detect and map argillic, phyllic, propylitic, and iron oxide alteration zones. Additionally, structural lineaments were extracted from the PC1 imagery to understand the structural pattern of the survey area. The incorporation of hydrothermal alteration zones and structural lineaments was achieved through the application of a fuzzy logic model, resulting in the generation of a mineral favorability map. The fuzzy logic model was customized to combine hydrothermal alteration and lineaments density maps, effectively eliminating false spectral anomalies induced by various interference factors. This map was then analyzed using the fractal concentration-area (C-A) model, which separated the anomaly from the geological background and generated a final mineral potential map. Analysis of fractal concentration-area was employed to define thresholds with greater precision, enhancing the reliability of mineral prospectivity assessments. Furthermore, laboratory analyses were performed to verify the outcomes of the mineral potential map. The obtained results revealed a significant affinity with the field data and indicated that the highly prospective zones are perfectly limited in spatial extent and generally associated with the contact of the Zaër granitic pluton with the metamorphic host rock, except for the anomaly identified to the southeast of the study area, along a major NE-SW trending fault.

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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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