Tectonic alteration information extraction and prospecting prediction for the Delong area of Qinghai Province based on GF-2 and ASTER data

doi:10.6046/zrzyyg.2022444

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Abstract

The Delong area, located in the eastern segment of the Eastern Kunlun gold-polymetallic metallogenic belt in Qinghai, is recognized as an area with significant exploration potential. However, its remote geographical location and rugged terrain pose challenges to large-scale geochemical explorations and conventional geological surveys. Based on ASTER and GF-2 data, this study identified the linear and circular structures by analyzing the color tones, geometric structures, and textures of remote sensing images with varying resolutions. Through the spectral analysis of primary alteration minerals, this study extracted the information on ferrugination, Al-OH, and Mg-OH alterations from visible light to near-infrared bands and short-wave infrared bands of ASTER using the mask + principal component analysis technique. Then, this study established a remote sensing-based prospecting prediction model for gold deposits in the study area by combining geoscience information and field survey results and comprehensively analyzing the association between the tectonic alteration information derived from remote sensing image interpretation and the gold mineralization of the study area. Using the prediction model, this study delineated three prospective areas for mineral exploration. The field verification revealed several new gold ore bodies in the Delong prospective area. The results show that the integration of remote sensing data and GIS technology can effectively identify surface hydrothermal alterations and tectonic spatial structures. The integration can serve as a guide for subsequent prospecting prediction of the study area.

Keywords GF-2 ASTER principal component analysis (PCA) prospecting prediction Delong are

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Issue Date: 13 March 2024

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	Yilong WANG
	Ran WANG
	Ziqing YAN
	Xinming ZHANG
	Xiaolong LI
	Chongwen XU

Cite this article:

Yilong WANG,Ran WANG,Ziqing YAN, et al. Tectonic alteration information extraction and prospecting prediction for the Delong area of Qinghai Province based on GF-2 and ASTER data[J]. Remote Sensing for Natural Resources, 2024, 36(1): 217-226.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022444 OR https://www.gtzyyg.com/EN/Y2024/V36/I1/217

Fig.1 Geological and mineral regional map of Delong area

Fig.2 Remote sensing interpretation marks of linear structure in Delong area

Fig.3 Lineaments in Delong area

Fig.4 Remote sensing interpretation marks of circular structure in Delong area

Fig.5 Spectral pairs of laboratory reflectance spectra (USGS) and ASTER resampled

Fig.6 Results of remote sensing alteration anomaly in Delong area

Fig.7 Photos of field verification for the remote sensing alteration anomaly in Delong gold deposit

Fig.8 Remote sensing interpretation showing prospecting target in Delong area

Fig.9 Photos of field verification for the Relong prospecting target area

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