Mapping hydrothermal alteration of the Au-Cu deposits in the Zhenghe magmatic-hydrothermal mineralization system, SE China, using Short Wavelength Infrared (SWIR) reflectance spectroscopy

Yan, Zhaokun; Chen, Shizhong; Li, Longming; Fan, Fei‐Peng; Zhang, Hongliang; Chen, Jing; Yang, Kai; Xiu, Liancun; Xu, Mincheng; Xing, Guangfu

doi:10.1016/j.gexplo.2022.107113

Cited by 4 publications

(4 citation statements)

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“…6-7). Based on the spatial distribution and predominance of minerals, nine different mineral zone have been distinguished and mapped: (1) Silicification, (2) Alunite, (3) Kaolinite, (4) Dickite, (5) Illite, (6) Pyrophyllite, (7) Chlorite, (8) Sericite, and (9) Montmorillonite zones. Collectively, these alterations exhibit a zoned pattern, from central massive silicification to residual silica (vuggy quartz), NW-SE oriented alunite, and marginal montmorillonite-illite zones within widespread kaolinite -dickite dominated alteration in Kirazlı main zone.…”

Section: Hydrothermal Alteration As a Proxy Of Blind Mineralization A...mentioning

confidence: 99%

“…This spectral range includes vibrations of essential absorption characteristics linked to the molecular bonds of OH, H2O, CO3, NH4, AlOH, FeOH, and MgOH [1]. Therefore, it is widely in use for the determination of different mineral groups, including phyllosilicates, hydroxylated silicates and sulfates, carbonates, and ammonium-bearing minerals [2] to create mineral-based alteration maps and models [3][4][5][6][7][8]. Earlier efforts on ore deposits have concentrated on the alteration of minerals as exploration vectors of mineralization since large-scale hydrothermal alteration is typically associated with mineralization [4,9,10].…”

Section: Introductionmentioning

confidence: 99%

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Identifying Potential Porphyry Cu Mineralization at the Kirazli District in Biga Peninsula (Nw Turkey): Insights From the Mapping Hydrothermal Alteration by Using Shortwave Infrared (Swir) Spectrometry

Aluç

Kuşcu

Moritz

2023

Mugla Journal of Science and Technology

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The Kirazlı mineral district is located at the center of the Biga peninsula metallogenic province, in a geological setting characterized by an extensional tectonic environment. The district hosts a high-sulfidation (HS) ore body with a total reserve of 33.86 Mt @ 0.69 g/t Au and 9.42 g/t Ag within a large-scale hydrothermal alteration. Although the ideal magmatic-hydrothermal models present the spatial and temporal association of HS-epithermal and porphyry Cu deposits, the porphyry Cu potential at the Kirazlı has not been evaluated, yet. Therefore, the mineral-based alteration mapping with the help of SWIR reflectance spectroscopy was carried out. Our study demonstrates that nine different mineral zone have been distinguished and mapped: (1) Silicification, (2) Alunite, (3) Kaolinite, (4) Dickite, (5) Illite, (6) Pyrophyllite, (7) Chlorite, (8) Sericite, and (9) Montmorillonite zones. Collectively, these alterations exhibit a zoned pattern, from central massive silicification to residual silica, NW-SE oriented alunite, and marginal montmorillonite-illite zones within widespread kaolinite – dickite dominated alteration in Kirazlı main zone. The occurrence of pyrophyllite and sericite dominates at the SE of the Kirazlı district, which refers to relative temperature increase. Subsequent drilling confirms the potential for deep prospecting of porphyry Cu mineralization in the region.

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Section: Hydrothermal Alteration As a Proxy Of Blind Mineralization A...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identifying Potential Porphyry Cu Mineralization at the Kirazli District in Biga Peninsula (Nw Turkey): Insights From the Mapping Hydrothermal Alteration by Using Shortwave Infrared (Swir) Spectrometry

Aluç

Kuşcu

Moritz

2023

Mugla Journal of Science and Technology

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“…NE-SW secondary faults, fissures, and interlayer faults and joints control the output of the ore body, and the antimony ore exhibits a clear layer-controlled distribution (Chen et al, 2009;Yang et al, 2013;Wang et al, 2022). The extraction of hydrothermal alteration information is highly important for the prospecting and exploration of hydrothermal ore deposits (Sillitoe, 2015;Testa et al, 2018;Chen et al, 2019;Zhang et al, 2019;Kaufmann et al, 2023;Zhong et al, 2023;Zhou et al, 2023). The distributions of fault structures and oreendowed strata are indicative of the antimony ore output in Huangyangling.…”

Section: Introductionmentioning

confidence: 99%

Extracting geological and alteration information and predicting antimony ore based on multisource remote sensing data in Huangyangling, Xinjiang

Wang,

Chen,

Dai

2024

Front. Earth Sci.

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Introduction: China has the world’s largest amount of antimony resources and plays a vital role in the global antimony industry. The Huangyangling area in Xinjiang belongs to the Lazhulong-Huangyangling antimony mineralization belt; this area is rich in antimony ore resources, with potential for discovery of additional ore. This high-elevation mountainous area is located in the northwestern region of the northern Tibetan Plateau, with a harsh natural environment and poor transportation access; thus, the use of traditional geological exploration methods is limited, and remote sensing technology provides unique advantages.Methods: Using Landsat 8 OLI and Gaofen-6 (GF-6) data, we extracted stratigraphic, lithologic and fault information from the study area through information enhancement processing of the images. Based on Landsat 8 OLI, Sentinel-2 and ASTER images and the use of remote sensing image preprocessing and interference information masking, the spectral characteristics of limonite, as well as hydroxyl, carbonate, and silicified alteration minerals were utilized; the characteristics included reflection or absorption in specific spectral bands. The spectral characteristics were then combined with principal component analysis (PCA) and the band ratio method to extract the alteration information for the study area.Results: The stratigraphy and boundaries between stratigraphic and lithologic units extracted in this study were defined, and numerous small faults were identified based on a comparison with 1:250,000 geologic maps. And the overall distribution trends of the indicators of alteration extracted in this study were located along fault zones; additionally, the hydroxyl and carbonate alteration anomalies matched well with known deposits (occurrences). Thus, the alteration information is a good indication of antimony ore bodies. Based on the geological interpretation, alteration information extraction and geochemical exploration data, four prospecting areas were identified.Discussion: The method of extracting geological and hydrothermal alteration information by remote sensing has practical significance because it provides the possibility for geological work and mineral exploration in difficult high-elevation environments.

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“…), diverse software such as: ENVI, ERDAS, Spec_minTM, and others, are also useful for mineral discrimination based on their absorption features in different wavelength positions (Grove et al, 1992, Clark et al, 1993. Many authors have used these tools for various purposes Thomp-son et al, (1999), Ducart et al, (2006), Simpson, (2015, Arbiol and Lyne (2021), Wang et al, 2021, Zhou et al, 2022, Zhou et al, 2023 Jacinto deposit is a vein system (Figure 2) where Beatriz, Sur de Elena and El Limón Nuevo veins are the most prospective (Piñero et al, 2021). GH mineral deposit comprises three sectors (Figure 3), where Three Hill (TH) and Little Golden Hill (LGH) sectors are exploited.…”

Section: Introductionmentioning

confidence: 99%

VNIR-SWIR using OreXpress spectroradiometer as a spectral approximation method to differentiate epithermal mineralization alteration phases. A case study from Jacinto and Big Golden Hill, Cuba

González Acosta,

Velasco-Herrera,

Zúñiga

et al. 2024

Geofis Int

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Spectral differences (range: 350-2500 nm) between the three alteration phases related to low and high sulfidation epithermal mineralization has been studied in the Jacinto deposit (Beatriz, Sur de Elena, and El Limon Nuevo veins) and the Big Golden Hill sector, respectively, located in the Cuban Cretaceous volcanic, Camagüey and Las Tunas provinces. This study has revealed the following differences between the phases: (a) Phase I: associated with the lithological type of quartz with massive and/or brecciated texture, where gold mineralization develops. At 600-800 nm, the signals identified responds with goethite and at 1400, 1900 y 2200 nm, as montmorillonite and nontronite. The reflectance value is 30 -50%, although in the El Limón Nuevo vein is 30-40%. (b) Phase II: Related to the argillic alteration zone composed by sericitic or silicified quartz and ferrous minerals such as limonite and hematite. It only occurs in Beatriz and Sur de Elena veins. At 600-800 nm, the signal is associated with ferrous minerals and at 1400, 1900, and 2200 nm, to clays minerals as montmorillonite, halloysite, and nontronite. The reflectance value is 30 – 50%. The difference between both Phases is in the amplitude and shape of the absorption feature at 1400 nm. (c) Phase III: it is located near the volcanic rock, composed by illite-smectite-quartz, without gold content and nearby to propylitic zone. At 600-800 nm, the feature indicates the presence of goethite and at 1400, 1900, and 2200 nm, to montmorillonite, illite, and nontronite. The reflectance value is 30 - 40%. The Big Golden Hill sector is characterized by peaks related to goethite and nontronite at 600-800 nm and pyrophyllite at 1400, 1950 and 2165 nm, typical of advanced argillic alteration. The reflectance value reaches 55%. This study represents one of the first applications of reflectance spcetroscopic techniques in Cuban mineral deposits.

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Mapping hydrothermal alteration of the Au-Cu deposits in the Zhenghe magmatic-hydrothermal mineralization system, SE China, using Short Wavelength Infrared (SWIR) reflectance spectroscopy

Cited by 4 publications

References 61 publications

Identifying Potential Porphyry Cu Mineralization at the Kirazli District in Biga Peninsula (Nw Turkey): Insights From the Mapping Hydrothermal Alteration by Using Shortwave Infrared (Swir) Spectrometry

Identifying Potential Porphyry Cu Mineralization at the Kirazli District in Biga Peninsula (Nw Turkey): Insights From the Mapping Hydrothermal Alteration by Using Shortwave Infrared (Swir) Spectrometry

Extracting geological and alteration information and predicting antimony ore based on multisource remote sensing data in Huangyangling, Xinjiang

VNIR-SWIR using OreXpress spectroradiometer as a spectral approximation method to differentiate epithermal mineralization alteration phases. A case study from Jacinto and Big Golden Hill, Cuba

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