Article Per Year (5 Year)
p-Index From 2019 - 2024
0.408
P-Index
This Author published in this journals
All Journal Jurnal Geominerba
Dewi Gentana
Departemen Geologi Terapan, Fakultas Teknik Geologi, Universitas Padjadjaran
Earth & Planetary Sciences Education Engineering Other

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
KARAKTERISTIK DAN TEMPERATUR BAWAH PERMUKAAN FLUIDA PANAS BUMI GUNUNG SLAMET DAN SEKITARNYA, JAWA TENGAH Khilal Khoiri Polanunu; Johanes Hutabarat; Agus Didit Haryanto; Dewi Gentana
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 6 No 2 (2021): Jurnal Geominerba - 2021
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (689.412 KB)

Abstract

Administratively the area of Mount Slamet is located in Central Java Province. The area has geothermal potential. The purpose of research is to find out the geochemical characteristics of water (type, origin, and equilibrium) and estimate of subsurface temperature (reservoir) geothermal by using methods of observation in the field and analysis of data from the geochemical laboratory results of hot springs. The results showed that the characteristics of the geothermal fluids type from MAPS and MAPP13 were bicarbonate water with the condition as pheripiral waters. MAPCB as a chloride sulfate water type with conditions as steam heated water, while MAPTH as a chloride water type in absorption of low B/Cl steam conditions with dominant Cl content become mature water. The origin of the MAPS, MAPCB, MAPP13 fluids are formed under conditions of absorption of high B/Cl steam with a dominant B content which are interpreted as originating from geothermal fluid, and when they moving to the surface the fluid interacts with the side rocks in its path. In addition, MAPS, MAPCB, MAPP13 are also included in the immature waters zone with high Mg content. This indicates that the three hot springs have intensive experienced mixing and dilution of shallow groundwater rich in Mg. Then, based on the difference in the concentration ratio of Cl/B in hot springs, the research area is interpreted have two reservoirs, namely reservoir A and reservoir B. Then, based on the calculation of the fluid geothermometer, it is estimated that reservoir A has temperature ranges from 149o -158oC, while reservoir B has temperature ranges from 89o -116oC.
HUBUNGAN KARAKTERISTIK INDEKS GEOMORFIK TERHADAP KEMUNCULAN MANIFESTASI PANAS BUMI DI DAERAH NOKILALAKI Muhammad Hudzaifah; Nana Sulaksana; Dewi Gentana
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 6 No 2 (2021): Jurnal Geominerba - 2021
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2052.23 KB)

Abstract

The appearance of geothermal manifestations in the Nokilalaki area is related to the morphology and geological structure which is influenced by the tectonic activity of the Palu - Koro segment. The study of geomorphic index through the calculation of river branching ratio (Rb), mountain face sinusitis (Smf), valley bottom width ratio - height (Vf) and lineament density (Ld) to determine the relationship of geomorphic index characteristics to the appearance of geothermal manifestations. The research method is remote sensing analysis and geomorphic index analysis on the Indonesian Topographical Map (RBI) and ASTER – DEM images to obtain the main pattern of geological lineaments and geomorphic index values. The value of the geomorphic index describes the level of tectonic activity and permeability in rocks, which plays a role in generating geothermal fluid from a geothermal system at depth to the surface. Based on the combination of geological lineament maps, geomorphic index maps and distribution of geothermal manifestations, the study area has two groups of geothermal manifestations. The area with the main pattern of geological lineament trending northwest – southeast is an area that is not deformed (Rb value: 4.55), active tectonic activity (Smf value: 1.34 – 1.53), high uplift (Vf value: 0.47), low lineament density (Ld value: 0.49 – 0.91), is associated with the appearance of geothermal manifestation groups in the depression edge of the Palu - Koro fault segment in the center of the study area. The main patterned area of ​​the north- northeast-south-southwest geological lineament is a non-deformed area (Rb value: 4, 20), active tectonic activity (Smf value: 1.47), high uplift (Vf value: 0, 22), medium to high lineament density (Ld value: 1.37 – 2.75), associated with the emergence of groups of geothermal manifestations in the hilly area of ​​the edge of the Palu - Koro fault segment in the southwest part of the study area.
Co-Authors Agus Didit Haryanto Johanes Hutabarat Khilal Khoiri Polanunu Muhammad Hudzaifah Nana Sulaksana