Yudiantoro, D.F., Yudiantoro, D.F. and Haty, I.P., Haty, I.P. and Sayudi, D.S., Sayudi, D.S. and Aji, A.B., Aji, A.B. and Choiriah, S.U., Choiriah, S.U. and Adrian, M.I.N., Adrian, M.I.N. (2019) Fluid-Rock Interaction During Hydrothermal Alteration at Parangtritis Geothermal Area, Yogyakarta, Indonesia. Geological Agency Minsitry of Energy and Mineral Resources.
|
Text
4. PJI-4.pdf Download (382kB) | Preview |
Abstract
Parangtritis volcano is a part of the Tertiary magmatic belt in Java, which is tectonically formed by collision between the Eurasian Continental plate and Indo-Australian Ocean plate. The collisions have taken place since Late Cretaceous and still continue today. In that period formed magmatic belt in Java that produce mineralization and geothermal. The characterization of geothermal in Tertiary volcanoes differs from the geothermal system that is on Quaternary volcanoes alignment in the middle Java, such as: Awibengkok, Wayang Windu, Darajat and Kamojang which has a high temperature. The purpose of this research was to study the mobilization elements due to interaction of hydrothermal fluids with wall rocks in low enthalpy geothermal regions of the Tertiary magmatic arc in Parangtritis. Identification of minerals and chemical elements change be approached with analytic methods petrographic and scanning electron microscope (SEM) analysis. As for knowing the composition and origin of hydrothermal fluids using analysis of cations, anions and isotope δ18O and δD of hot water manifestation. The occurrence of geothermal manifestations in Parangtritis, such as hot water and rock alteration reflects the interaction hydrothermal fluids with wall rock. While the results of hydrothermal fluid interaction with wall rocks generate argillic zone. In this zone present mineral alteration such as: quartz, calcite, montmorillonite and hematite. The presence of alteration minerals montmorillonite as replacing pyroxene provides evidence that there have been interactions between fluids with rocks. This interaction as a process of mobilization element. Elements Si, Ca, Mg, Fe decrease followed by an increase of Al during the replacement of pyroxene into montmorillonite. The mobility of this element occurs due to the acid fluids. However, the hydrothermal fluids composition of the current hot water manifestation is neutral chloride water type composition and the origin of the fluids is meteoric water (δ18O: -4.20 ‰ and δD: 23.43 ‰). Keywords: rocks, hydrothermal fluid, alteration mineral, mobilization element
| Item Type: | Other |
|---|---|
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Dr.Ir.MT DWI FITRI YUDIANTORO |
| Date Deposited: | 12 Sep 2019 06:16 |
| Last Modified: | 12 Sep 2019 06:17 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/20944 |
Actions (login required)
 |
View Item |