Delineating Alteration Footprints from Field and ASTER SWIR Spectra, Geochemistry, and Gamma-Ray Spectrometry above Regolith-Covered Base Metal Deposits—An Example from Abra, Western Australia☼

Lampinen, Heta; Laukamp, Carsten; Occhipinti, Sandra; Metelka, Václav; Spinks, Sam

doi:10.5382/econgeo.2017.4537

Cited by 25 publications

(10 citation statements)

References 79 publications

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“…The O -Hrelated absorption feature in white micas is centered at around 2350 nm, overlapping the carbonate spectral feature in the same range from 2300 to 2550 nm (Clark et al, 1990;Van der Meer 2004). As noted earlier, the left-hand symmetry shown by the spectral absorption feature at 2300 to 2335 nm, can be used to distinguish them from white micas (Gaffey 1986;Lampinen et al, 2017).…”

Section: Vnir and Swir Absorption Features Of Minerals Investigated I...mentioning

confidence: 90%

“…Since its advent, geological remote sensing has been used as a tool for the exploration of mineral deposits. Even though spectral sensing has been applied to the study and exploration of several ore deposit types through different scales of observation (e.g., Lampinen et al, 2017;Bedini 2017;Laukamp et al, 2022, and references therein), its potential still remains underexplored for the investigation of several ore minerals of notable economic importance. At the same time, more advanced satellites are launched ever more frequently, making the available spectral data increasingly detailed in both the spatial and the spectral resolution (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Mapping hydrothermal and supergene alteration zones associated with carbonate-hosted Zn-Pb deposits by using PRISMA satellite imagery supported by field-based hyperspectral data, mineralogical and geochemical analysis

Chirico

Mondillo

Laukamp

et al. 2023

Ore Geology Reviews

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Section: Vnir and Swir Absorption Features Of Minerals Investigated I...mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Mapping hydrothermal and supergene alteration zones associated with carbonate-hosted Zn-Pb deposits by using PRISMA satellite imagery supported by field-based hyperspectral data, mineralogical and geochemical analysis

Chirico

Mondillo

Laukamp

et al. 2023

Ore Geology Reviews

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“…In Australia, most of the country is covered with weathered regolith, making exploration challenging. Lampinen et al [107] used ASTER SWIR data with surface geochemistry analysis and gamma-ray spectrometry over a known base-metal deposit. The geophysical data allowed discrimination of lithologic units underneath the regolith.…”

Section: Alteration Mapping With Aster Data and Other Data Sourcesmentioning

confidence: 99%

Twenty Years of ASTER Contributions to Lithologic Mapping and Mineral Exploration

Abrams

Yamaguchi

2019

Remote Sensing

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The Advanced Spaceborne Thermal Emission and Reflection Radiometer is one of five instruments operating on the National Aeronautics and Space Administration (NASA) Terra platform. Launched in 1999, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) has been acquiring optical data for 20 years. ASTER is a joint project between Japan’s Ministry of Economy, Trade and Industry; and U.S. National Aeronautics and Space Administration. Numerous reports of geologic mapping and mineral exploration applications of ASTER data attest to the unique capabilities of the instrument. Until 2000, Landsat was the instrument of choice to provide surface composition information. Its scanners had two broadband short wave infrared (SWIR) bands and a single thermal infrared band. A single SWIR band amalgamated all diagnostic absorption features in the 2–2.5 micron wavelength region into a single band, providing no information on mineral composition. Clays, carbonates, and sulfates could only be detected as a single group. The single thermal infrared (TIR) band provided no information on silicate composition (felsic vs. mafic igneous rocks; quartz content of sedimentary rocks). Since 2000, all of these mineralogical distinctions, and more, could be accomplished due to ASTER’s unique, high spatial resolution multispectral bands: six in the SWIR and five in the TIR. The data have sufficient information to provide good results using the simplest techniques, like band ratios, or more sophisticated analyses, like machine learning. A robust archive of images facilitated use of the data for global exploration and mapping.

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“…These modules include: (i) three bands in VNIR (15 m pixel resolution); (ii) six bands in the SWIR (30 m pixel resolution); and (iii) five bands in the TIR (90 m pixel resolution). The 2012 ASTER maps of Australia have since been investigated for a range of geoscience applications [6][7][8][9][10][11][12][13][14][15], though their value has arguably been limited by both the use of a heavy green vegetation mask [5], which culled >40% of all pixels (100% in more wet, vegetated regions), with a number of products especially over arid regions showing the effects of variable dry vegetation cover [6]. Therefore, a new strategy for correcting vegetation is required to improve the geoscience value of ASTER imagery [7].…”

Section: Introductionmentioning

confidence: 99%

Satellite Advanced Spaceborne Thermal Emission and Reflection Radiometer Mineral Maps of Australia Unmixed of Their Green and Dry Vegetation Components: Implications for Mapping (Paleo) Sediment Erosion–Transport–Deposition Processes

Cudahy,

Cudahy

2024

Remote Sensing

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The 2012 satellite ASTER geoscience maps of Australia were designed to provide public, web-accessible, and spatially comprehensive surface mineralogy for improved mapping and solutions to geoscience challenges. However, a number of the 2012 products were clearly compromised by variable green and/or dry vegetation cover. Here, we show a strategy to first estimate and then unmix the contributions of both these vegetation components to leave, as residual, the target surface mineralogy. The success of this unmixing process is validated by (i) visual suppression/removal of the regional climate and/or local fire-scar vegetation patterns; and (ii) pixel values more closely matching field sample data. In this process, we also found that the 2012 spectral indices used to gauge the AlOH content, AlOH composition, and water content can be improved. The updated (new indices and vegetation unmixed) maps reveal new geoscience information, including: (i) regional “wet” and “dry” zones that appear to express “deep” geological characters often expressed through thick regolith cover, with one zone over the Yilgarn Craton spatially anti-correlated with Archaean gold deposits; (ii) a ~1000 km wide circular feature over the Lake Eyre region defined by a rim of abundant “muscovite” that appears to coincide with opal deposits; (iii) a N–S zonation across the western half of the continent defined by abundant muscovite in the south and kaolinite in the north, which appears to reflect opposing E ↔ W aeolian sediment transport directions across the high-pressure belt; (iv) various paleo-drainage networks, including those over aeolian sand covered the “lowlands” of the Canning Basin, which are characterized by low AlOH content, as well as those over eroding “uplands”, such as the Yilgarn Craton, which have complicated compositional patterns; and (v) a chronological history of Miocene barrier shorelines, back-beach lagoons, and alluvial fans across the Eucla Basin, which, to date, had proved elusive to map using other techniques, with potential implications for heavy mineral sand exploration. Here, we explore the latter three issues.

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Delineating Alteration Footprints from Field and ASTER SWIR Spectra, Geochemistry, and Gamma-Ray Spectrometry above Regolith-Covered Base Metal Deposits—An Example from Abra, Western Australia☼

Cited by 25 publications

References 79 publications

Mapping hydrothermal and supergene alteration zones associated with carbonate-hosted Zn-Pb deposits by using PRISMA satellite imagery supported by field-based hyperspectral data, mineralogical and geochemical analysis

Mapping hydrothermal and supergene alteration zones associated with carbonate-hosted Zn-Pb deposits by using PRISMA satellite imagery supported by field-based hyperspectral data, mineralogical and geochemical analysis

Twenty Years of ASTER Contributions to Lithologic Mapping and Mineral Exploration

Satellite Advanced Spaceborne Thermal Emission and Reflection Radiometer Mineral Maps of Australia Unmixed of Their Green and Dry Vegetation Components: Implications for Mapping (Paleo) Sediment Erosion–Transport–Deposition Processes

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