Styles of Hydrothermal Alteration in the Darajat Geothermal Field, West Java, Indonesia: a Progress Report
- Location
- Darajat, Indonesia; Java
- Conference
- New Zealand Geothermal Workshop
- Year
- 2001
- Session
- Hydrothermal Mineralogy
- Language
- English
Full text
4613KB, opens in a new tab
Abstract
Hydrothermal minerals in the Darajat geothermal field occur in two main styles: replacement and in veins. The former is a product of reactions between thermal fluids and primary minerals present in the reservoir rocks, comprising andesite lavas and pyroclastics. Although the minerals formed in both styles are the same, e.g. wairakite, prehnite, epidote, calcite, their significance differs and show that changes in hydrology have occurred in at least part of the Darajat reservoir. The textural relations within the vein minerals, for example, record local progressive cooling.
Copyright 2001, University of Auckland. Readers who download papers from this site should honour the copyright of the original authors, and may not copy or distribute the work further without the permission of the original publisher.