Per-pixel and sub-pixel mapping of alteration minerals associated with geothermal systems using ASTER SWIR data

Abubakar, Aliyu Ja’afar; Hashim, Mazlan; Pour, Amin Beiranvand; Musa, Sulaiman Ibrahim; Amusuk, Danboyi Joseph

doi:10.1088/1755-1315/169/1/012086

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Thus, the presence of minerals indicative of hydrothermal alteration exhibits diagnostic spectral absorption features. ASTER satellite imagery has been thoroughly used to discriminate hydrothermal alteration [2,[4][5][6][7][8][38][39][40][41][42][43][44], considering its wide spectral coverage in the VNIR and SWIR region.…”

Section: Endmember Selectionmentioning

confidence: 99%

“…In our research, we used the resampled spectra from the USGS spectral library as a reference for the spatial distribution of kaolin. This method combines the strength of the matched filter (MF) method (no requirement to be aware of all the endmembers) with physical constraints imposed by the mixing theory (the signature at any given pixel is a linear combination of the individual components contained in that pixel) [40,46]. It peforms partial unmixing only by finding the abundance of a single, user-defined endmember, by maximising the response of the endmember of interest, and by minimising the response of the unknown composite background thus "matching" the known signature [47,48].…”

Section: Mixture Tuned Matched Filtering (Mtmf) Algorithmmentioning

confidence: 99%

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Kaoline Mapping Using ASTER Satellite Imagery: The Case Study of Kefalos Peninsula, Kos Island

Kokkaliari

Kanellopoulos

Illiopoulos

2021

International Conference on Raw Materials and Circular Economy

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The present work aims to map kaolin occurrences on the Kefalos peninsula, SW Kos Island, Greece, through the elaboration of ASTER satellite imagery. The island of Kos is located on the eastern edge of the South Aegean Active Volcanic Arc (SAAVA) and is characterised by its complex geologic structure. During Plio-Pleistocene, the voluminous eruption of the Kos Plateau Tuff was recorded on Kefalos; the largest quaternary eruption in the Mediterranean. Kaolin is the product of hydrothermal alteration of the Pliocene volcanic rocks with rhyolitic composition. Our study emphasises the usefulness of satellite imagery combined with the Mixture Tuned Matched Filtering (MTMF) technique to detect occurrences of industrial minerals, kaolin-group minerals in this case, either in terms of raw mineral exploitation or by mapping hydrothermal alteration.

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