Harjanto, Agus and SUPARKA, Emmy and ASIKIN, SUKENDAR and YUWONO, Y.S (2006) Magmatic related to hydrothermal alteration in Kulon Progo, Central Java, Indonesia. PROCEEDING International Interdisciplinary Conference Volcano International Gathering 2006. ISSN 979-8918-53-3
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Abstract
The volcanic rocks in Kulon Progo were formed during Oligocene-Miocene time and have undergone alteration since that time. They mostly form the Old Andesite Formation, which consists of interbedded volcanic breccia, tuff, andesite, dacite and diorite. They are part of the magmatic Sunda-Banda Arc. These volcanic rocks have chemical compositions that range from basalt andesite to dacite and from low potassium series to calc-alkaline series. Phenocrysts consist of pyroxene, hornblende, plagioclase, alkali feldspars and quartz. The rocks have under gone hydrothermal alteration and based on mineral alteration assemblages, they can be divided into three alteration zones. These zones are : 1) A phyllic zone that is characterized by quartz-sericite-chlorite, 2) A prophyllitic zone that is characterized by chlorite-epidote-calcite, 3) An argillic zone characterized by illite-kaolinite-monmorilonite.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Dr.ST,MT AGUS HARJANTO |
| Date Deposited: | 11 Apr 2019 08:31 |
| Last Modified: | 11 Apr 2019 08:31 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/19283 |
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