Mapping hydrothermal altered mineral deposits using Landsat 7 ETM+ image in and around Kuju volcano, Kyushu, Japan

M. Bodruddoza Mia, Yasuhiro Fujimitsu

Research output: Contribution to journalArticle

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Abstract

To evaluate the conventional methods for mapping hydrothermal altered deposits by using Landsat 7 ETM+ image in and around Kuju volcano is the prime target of our study. The Kuju volcano is a mountainous composite which consists of hornblende-andesite lava domes and associated lava flows. We used the colour composite, band ratio, principal component analysis, least square fitting and reference spectra analysis methods. The colour composite and band ratio methods showed very clearly the hydrothermal altered deposits of clay minerals, iron oxides and ferric oxides around the fumaroles. The principal component analysis using the Crosta technique also enabled us to represent undoubtedly the altered hydroxyl and iron-oxide mineral deposits of this region concentrating around the fumaroles. Least square fitting method illustrated the goethite, hematite and clay alteration region. Finally the target detection method for reference spectral analysis by using ENVI 4.3 detected the representative hydrothermal altered minerals around Kuju volcano fumaroles area. Therefore, all the methods showed high efficiency for mapping hydrothermal altered deposits especially iron-oxide minerals such as hematite, goethite and jarosite, which are alteration products of hydrothermal sulfides around the fumaroles.

Original languageEnglish
Pages (from-to)1049-1057
Number of pages9
JournalJournal of Earth System Science
Volume121
Issue number4
Publication statusPublished - Aug 1 2012

Fingerprint

mineral deposit
fumarole
Landsat
volcano
hydrothermal deposit
iron oxide
goethite
hematite
principal component analysis
lava dome
jarosite
mineral
detection method
lava flow
hornblende
andesite
spectral analysis
clay mineral
sulfide
method

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

Mapping hydrothermal altered mineral deposits using Landsat 7 ETM+ image in and around Kuju volcano, Kyushu, Japan. / Bodruddoza Mia, M.; Fujimitsu, Yasuhiro.

In: Journal of Earth System Science, Vol. 121, No. 4, 01.08.2012, p. 1049-1057.

Research output: Contribution to journalArticle

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