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Detection of Hydrothermal Alteration Zones using Landsat 8 OLI image: A Case Study of Gold Prospecting in Nyongwon Area, DPR Korea
Journal of the Indian Society of Remote Sensing ( IF 2.5 ) Pub Date : 2021-06-25 , DOI: 10.1007/s12524-021-01385-8
Un Song Pak , Chol Ung Pak

This paper focused on the detection of alteration zones associated with the hydrothermal gold deposit using Landsat 8 OLI image data. In this paper, the hydrothermal alteration zones in the study area were detected from visible–near-infrared (VNIR) and shortwave infrared (SWIR) bands of Landsat 8 OLI image data. One of the important issues for detecting hydrothermal alteration zones is to reduce the effects of the vegetation spectrum that affects the spectral feature extraction of the hydrothermally altered minerals in the relatively dense cover area. In this paper, we extracted the feature of the vegetation spectrum in the area using normalized difference vegetation index (NDVI) and mixture tuned matched filtering (MTMF) technique, then subtracted the corresponding vegetation abundance from the image pixel spectrum, finally we obtained the image with reduced vegetation effects. In the study area, the mapped hydrothermal alteration zones are mainly regions with high content of iron oxide and clay minerals and these are regions closely associated with hydrothermal mineralization. Crosta technique was used for mapping these altered zones. In this paper, principal component analysis (PCA) was carried out by selecting Landsat 8 OLI bands 2, 4, 5, 6 for mapping iron oxides and Landsat 8 OLI bands 2, 5, 6, 7 for mapping clay minerals. These alteration zones including the iron oxides and clay minerals in the study area were clearly represented in the generated images. These alteration zones are valuable for prospecting the gold deposit based on the ore geological characteristics of this area.



中文翻译:

使用 Landsat 8 OLI 图像探测热液蚀变带:朝鲜 Nyongwon 地区金矿勘探案例研究

本文重点介绍了使用 Landsat 8 OLI 图像数据检测与热液金矿床相关的蚀变带。本文从Landsat 8 OLI图像数据的可见-近红外(VNIR)和短波红外(SWIR)波段检测研究区的热液蚀变带。探测热液蚀变带的重要问题之一是减少植被光谱对相对密集覆盖区热液蚀变矿物光谱特征提取的影响。在本文中,我们利用归一化差异植被指数(NDVI)和混合调谐匹配滤波(MTMF)技术提取该区域植被光谱的特征,然后从图像像素光谱中减去相应的植被丰度,最后我们得到了植被影响减少的图像。在研究区,绘制的热液蚀变带主要是氧化铁和粘土矿物含量较高的区域,这些区域与热液成矿关系密切。Crosta 技术被用于绘制这些蚀变区的地图。本文选择Landsat 8 OLI波段2, 4, 5, 6进行氧化铁测绘, Landsat 8 OLI波段2, 5, 6, 7进行粘土矿物测绘, 进行主成分分析(PCA)。这些蚀变带包括研究区的氧化铁和粘土矿物,在生成的图像中清晰地呈现出来。这些蚀变带对基于该区矿石地质特征的金矿找矿具有重要价值。绘制的热液蚀变带主要是氧化铁和粘土矿物含量高的区域,这些区域与热液成矿密切相关。Crosta 技术被用于绘制这些蚀变区的地图。本文选择Landsat 8 OLI波段2, 4, 5, 6进行氧化铁测绘, Landsat 8 OLI波段2, 5, 6, 7进行粘土矿物测绘, 进行主成分分析(PCA)。这些蚀变带包括研究区的氧化铁和粘土矿物,在生成的图像中清晰地呈现出来。这些蚀变带对基于该区矿石地质特征的金矿找矿具有重要价值。绘制的热液蚀变带主要是氧化铁和粘土矿物含量高的区域,这些区域与热液成矿密切相关。Crosta 技术被用于绘制这些蚀变区的地图。本文选择Landsat 8 OLI波段2, 4, 5, 6进行氧化铁测绘, Landsat 8 OLI波段2, 5, 6, 7进行粘土矿物测绘, 进行主成分分析(PCA)。这些蚀变带包括研究区的氧化铁和粘土矿物,在生成的图像中清晰地呈现出来。这些蚀变带对基于该区矿石地质特征的金矿找矿具有重要价值。

更新日期:2021-06-25
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