Altered mineral mapping and characteristic analysis in Qianhongquan Area，Beishan，Gansu Province，based on hyperspectral data from the ZY-1 02D satellite

doi:10.6046/zrzyyg.2024293

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Abstract

Hyperspectral remote sensing （HRS） technology，with its high spectral resolution and extensive spectral coverage，demonstrates significant potential in geological prospecting. Focusing on the Qianhongquan gold deposit in the Beishan orogenic belt，Gansu Province，this study conducted altered mineral mapping and component analysis，using HRS data from the AHSI sensor on the ZY-1 02D satellite and the self-developed hyperspectral mineral mapping technique，GeoAHSI，revealing their spatial distribution characteristics. Besides，ground-based spectral measurements were conducted on typical profiles to validate the spectral data，thereby assessing the reliability of the hyperspectral mineral mapping results. The results indicate that the primary altered minerals in the Qianhongquan gold deposit and its surrounding rocks include sericites （low-aluminum，medium-aluminum，high-aluminum，and iron-rich muscovites），calcites，dolomites，epidotes，and chlorites. Their distribution is closely related to ductile shear zones，with the distribution of sericites，chlorites，and epidotes being particularly significant within these zones. This spatial correlation provides critical indicators for regional prospecting. Additionally，it was observed that the 2 200 nm absorption feature of sericites and the 2 250 nm absorption feature of chlorites exhibit marked enrichment in silicon （Si） and iron （Fe） around ore bodies，which is closely correlated to the chemical compositions of the minerals. By enhancing the identification of weak spectral features，this study successfully applied HRS technology to mineral identification and spatial distribution analysis. These findings provide a scientific basis for further exploration of the Qianhongquan gold deposit and offer valuable references and guidance for the application of HRS in similar deposits.

Keywords hyperspectral remote sensing （HRS） alerted mineral mapping ZY-1 02D （Ziyuan-1 02D） satellite Qianhongquan gold deposit in Beishan orogenic belt Gansu Province

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Issue Date: 28 October 2025

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	Haiyang HE
	Shijie LI
	Haoyang QIN
	Xiaoyu LIU
	Siqi WANG
	Xu SUN

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Haiyang HE,Shijie LI,Haoyang QIN, et al. Altered mineral mapping and characteristic analysis in Qianhongquan Area，Beishan，Gansu Province，based on hyperspectral data from the ZY-1 02D satellite[J]. Remote Sensing for Natural Resources, 2025, 37(5): 195-205.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2024293 OR https://www.gtzyyg.com/EN/Y2025/V37/I5/195

Fig.1 Regional geological sketch map of the Beishan area （modified from reference[15]）

Fig.2 Geological map of the Qianhongquan gold deposit （modified from reference [18]）

Tab.1 Data parameters of ZY1-02D

Fig.3 Hyperspectral image showing the location of the Qianhongquan area

Fig.4 Process of the mineral mapping

Fig.5 Spectral matching recognition

Tab.2 Muscovite samples from the USGS spectral library

Fig.6 Relationship between the wavelength of 2 200 nm absorption characteristics of muscovite and its Al₂O₃ content

Tab.3 Chlorite samples from the USGS spectral library

Fig.7 Relationship between the wavelength of 2 250 nm absorption characteristics of chlorite and its MgO and Fe₂O₃ content

Fig.8 Comparison of ZY1-02D AHSI spectrum of typical minerals with reference spectrum from the USGS spectral library

Fig.9 Distribution of alteration minerals extracted from hyperspectral remote sensing data in the Qianhongquan area

Fig.10 -1 Distribution of absorption wavelength extracted from ZY1-02D AHSI data

Fig.11 Measured spectral curves of the alteration zone

Fig.12 Alteration zones and sample photographs in the Qianhongquan area

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