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Journal of Earth System Science

, Volume 121, Issue 4, pp 1049–1057 | Cite as

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

  • Bodruddoza Mia
  • Yasuhiro Fujimitsu
Article

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.

Keywords

Mapping hydrothermal alteration Landsat 7 ETM+ fumaroles Kuju volcano 

Notes

Acknowledgements

The authors would like to show their sincere gratitude to G-COE of Kyushu University for giving financial support for this research. They also acknowledged NASA warehouse inventory for providing satellite image with free of cost in this study. The authors would also like to thank the people of Geothermics Laboratory of Kyushu University for their support. They are grateful to Dr Somnath Dasgupta who has reviewed, corrected and logically commented to upgrade the manuscript.

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Copyright information

© Indian Academy of Sciences 2012

Authors and Affiliations

  1. 1.Department of Earth Resources Engineering, Graduate School of EngineeringKyushu UniversityKyushuJapan
  2. 2.Department of GeologyUniversity of DhakaDhaka-1000Bangladesh
  3. 3.Department of Earth Resources EngineeringKyushu UniversityKyushuJapan

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