鄂西水月寺地区Landsat8-OLI遥感蚀变信息与地球化学奇异性异常信息融合应用

doi:10.11720/wtyht.2024.1329

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Abstract

Prolonged intense magmatic-hydrothermal activity and regional metamorphism in western Hubei Province created favorable conditions for the formation of gold deposits. As the Shuiyuesi area witnessed a thorough exploration of surface and outcrop mines, the prospecting of gold deposits in the area has shifted to overburden and deep zones in recent years. However, the prospecting in the Shuiyuesi area becomes gradually complicated due to significant topographic relief, high vegetation coverage, and severe terrain cutting. Hence, efficient prospecting approaches are urgently needed to achieve breakthroughs in ore prospecting. Through geological survey and analysis, this study statistically analyzed the alteration types intimately associated with gold mineralization in nine gold veins of the Shuiyuesi area. It extracted alteration information from Landsat8-OLI remote sensing images using methods like numerical operations, and weak anomaly information of element distribution using methods like multivariate statistical analysis and local singularity analysis. Employing the data integration technology, it integrated the alteration anomaly information from remote sensing images and the singularity anomaly information. Based on comprehensive information, such as geological settings for mineralization and metallogenic regularity, this study identified 19 metallogenic prospect areas and new anomaly clues in the Yangjiatang-Caishenmiao area. The novel approach combining singularity analysis and data integration enhanced the spatial resolution of geochemical anomalies, the spatial details of surface features, and weak anomaly information associated with gold mineralization, thus enabling rapid and efficient identification and extraction of comprehensive anomalies and prediction of metallogenic prospect areas.

Key words： geochemical anomaly alteration anomaly from remote sensing images data integration prospect area prediction

Received: 22 July 2023 Published: 21 October 2024

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	Qi-Bing BAO
	Peng YANG
	Zhou ZHOU
	Li LEI
	Qing-Lin XIA
	Yin LIU
	Yin GONG
	Jin-Xiang LU

Cite this article:

Qi-Bing BAO,Peng YANG,Zhou ZHOU, et al. Integrated application of alteration information from Landsat8-OLI remote sensing images and geochemical singularity anomaly information for the Shuiyuesi area of western Hubei Province[J]. Geophysical and Geochemical Exploration, 2024, 48(5): 1302-1312.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1329 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I5/1302

Geological map of Shuiyuesi area
Ar₂y—middle Archean Yemadong Formation;Pt₁h—early Proterozoic Huanglianghe Formation;Pt₂l—middle Proterozoic Lierping Formation; $\epsilon$—Cambrian system;Z—Sinian system;Nh—Nanhua system;Ar₃D—Neoarchean Dongchonghe gneiss complex;Pt₂v—middle Proterozoic diabase;Pt₂Ψlσ—middle Proterozoic pyroxene peridotite;Pt₂Σ—middle Proterozoic ultrabasic rocks;Pt₃ηγ—Neoproterozoic diorite granite;Pt₃βμ—Neoproterozoic gabbro diabase;Pt₃ξγ—Neoproterozoic potassium feldspar granite;Pt₃γo—Neoproterozoic biotite plagioclase granite;1—geological boundary;2—fault structure;3—gold mineralization points

金矿脉	与金矿化关系密切的蚀变类型	可识别离子
罐湾矿脉	硅化、绢云母化、碳酸盐化、褐铁矿化	Fe³⁺、 $CO 3 2 -$ 、OH^-
筲箕湾矿脉	硅化、黄铁矿化、绢云母化、褐铁矿化	Fe²⁺、Fe³⁺、OH^-
何家湾矿脉	硅化、黄铁矿化、绢云母化	Fe²⁺、OH^-
祠堂湾矿脉	黄铁矿化、碳酸盐化、绿泥石化	Fe²⁺、 $CO 3 2 -$ 、OH^-
庙湾矿脉	碳酸盐化、黄铁矿化、绿泥石化	Fe²⁺、 $CO 3 2 -$ 、OH^-
狮子崖矿脉	黄铁矿化、褐铁矿化	Fe²⁺、Fe³⁺
天鹅池矿脉	黄铁矿化、褐铁矿化	Fe²⁺、Fe³⁺
松树湾矿脉	弱黄铁矿化	Fe²⁺
宋家湾矿脉	黄铁矿化、褐铁矿化	Fe²⁺、Fe³⁺

The alteration types and identifiable ions closely related to gold mineralization in the Shuiyuesi mining area

CO 3 2 -(modified according to USGS spectral library)
a—spectral curve of minerals containing OH^-;b—spectral curve of minerals containing iron ions;c—spectral curve of minerals containing

CO 3 2 -

Spectral curves of typical minerals containing OH^-, iron ions, and C $CO 3 2 -$ (modified according to USGS spectral library)
a—spectral curve of minerals containing OH^-;b—spectral curve of minerals containing iron ions;c—spectral curve of minerals containing

CO 3 2 -

Enhanced image of Landsat8-OLI for alteration information in the research area(OLI6/OLI7)

Orthogonal rotation factor load matrix

Au element geochemical anomaly map
a—the IDW interpolation results of Au element; b—the singularity analysis results of Au element

Au-Cu-Hg element combination geochemical anomaly map
a—the IDW interpolation results of Au-Cu-Hg element combination; b—the singularity analysis results of Au-Cu-Hg element combination

37])
">

Basic principle of geochemical layer and remote sensing Image fusion technology (modified according to Ding^[37])

The fusion results of geochemical data and remote sensing data in Shuiyuesi research area
a—the fusion result of Au element IDW layer and remote sensing alteration image;b—the fusion results of Au element singularity index layer and remote sensing alteration images

Enlarged comparison map of each layer in the area around Yangjiatang and Caishenmiao (green circle represents the location of the gold mine)
a—the result of zooming in on the local area of the Au element IDW layer; b—the local magnification result after fusing the IDW layer of Au element with the enhanced layer of remote sensing image alteration information;c—the locally magnified result of the fusion of Au element singularity index layer and remote sensing image alteration information enhancement laye

Classification principles of Shuiyuesi research area

Distribution map of metallogenic prospective areas in the Shuiyuesi research area

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