Investigating Alteration Zone Mapping Using EO-1 Hyperion Imagery and Airborne Geophysics Data

IF 1.1 Q3 MINING & MINERAL PROCESSING
M. Lotfi, H. Arefi, A. Bahroudi
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Abstract

Hyperspectral remote sensing records reflectance or emittance data in a large sum of contiguous and narrow spectral bands, and thus has many information in detecting and mapping the mineral zones. On the other hand, the geological and geophysical data gives us some other fruitful information about the physical characteristics of soil and minerals that have been recorded from the surface. The Sarcheshmeh mining area located in the NW-trending Uromieh-Dokhtar magmatic belt within Central Iran is mainly of porphyry type, and is associated with extensive hydrothermal alterations. Due to the semi-arid type of climate with abundant rock exposure, this area is suitable for application of remote sensing techniques. In this work, we focus on generating the alteration maps around Cu porphyry copper deposits using the spectral angle mapper algorithm on Hyperion data by applying two filters named reduction to pole and analytical signal on a total magnetic intensity map and generating the Kd map from radiometry data. What is clear is the high importance of applying the adequate pre-processing on Hyperion data because of low signal-to-noise ratio. By comparing the known deposits in the region with the results obtained by applying the mentioned methods, it is revealed that not all the higher K radiometric values are entirely associated with the hydrothermal alteration zones, and in contrast, the potassic alteration map extracted from Hyperion imagery successfully corresponds to the alteration zones around the Sarcheshmeh mining area. Finally, the results particularly obtained from processing the Hyperion data are confirmed by indices of Cu porphyry deposits in the region.
利用EO-1 Hyperion图像和航空地球物理数据研究蚀变带制图
高光谱遥感记录了大量连续的窄光谱波段的反射率或发射率数据,为矿带探测和填图提供了丰富的信息。另一方面,地质和地球物理数据为我们提供了一些关于地表记录的土壤和矿物的物理特征的其他有用信息。Sarcheshmeh矿区位于伊朗中部nw走向的Uromieh-Dokhtar岩浆带,主要为斑岩型,与广泛的热液蚀变有关。由于该地区为半干旱气候,岩石暴露丰富,适合应用遥感技术。在这项工作中,我们重点利用光谱角成像仪算法在Hyperion数据上生成铜斑岩铜矿周围的蚀变图,在总磁强图上应用极点还原和分析信号两个滤波器,并从辐射测量数据中生成Kd图。很明显,由于信噪比低,对Hyperion数据进行充分的预处理非常重要。将该地区已知矿床与上述方法得到的结果进行对比,发现并非所有较高的K辐射值都与热液蚀变带完全相关,而Hyperion图像提取的钾蚀变图则成功地与Sarcheshmeh矿区周围的蚀变带相对应。最后,利用该区铜斑岩矿床指标对Hyperion资料的处理结果进行了验证。
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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0
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