Abstract
Hydrothermal alteration occurs in active volcanic systems where circulating seawater results in mineral and chemical changes in the volcanic host rocks depending on pressure-temperature conditions and initial chemical composition of the host rock. As by-products of such alteration various precious metals (gold, silver, copper etc) form. Spectral matching techniques are traditionally used in geologic studies using hyperspectral data to generate surface mineral maps which allow to characterize hydrothermal alteration. Using a combination of Al-MgOh and FeOH absorption features we can link spectral features to mineral chemistry thus linking spectroscopy to geochemistry of alteration systems. With contextual image analysis techniques applied to ratio images of combined absorption features we can detect boundaries between alteration zones from hyperspectral data. This allows to reconstruct paleo fluid pathways and interpret these in terms of discharge and recharge areas which are important areas for mineral prospectivity of these systems. The facies successions are important indicators for the genetic nature of these systems. Studying the Australian hydrothermal system of the Pilbara as a proxy to mineral zonations found on the planet Mars allows us to understand the nature of these mineral distributions on Mars.
Original language | English |
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Title of host publication | 2nd Workshop on Hyperspectral Image and Signal Processing |
Subtitle of host publication | Evolution in Remote Sensing, WHISPERS 2010 - Workshop Program |
Publisher | IEEE |
Number of pages | 4 |
ISBN (Print) | 9781424489077 |
DOIs | |
Publication status | Published - 29 Nov 2010 |
Event | 2nd Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS 2010 - Reykjavik, Iceland Duration: 14 Jun 2010 → 16 Jun 2010 Conference number: 2 |
Publication series
Name | 2nd Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS 2010 - Workshop Program |
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Conference
Conference | 2nd Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS 2010 |
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Abbreviated title | WHISPERS 2010 |
Country/Territory | Iceland |
City | Reykjavik |
Period | 14/06/10 → 16/06/10 |
Keywords
- Alteration mineralogy
- Australia
- Hydrothermal
- Mars
- Object-based
- Pilbara