Open AccessHydrothermal Fluids-Rock Interactions in the Geothermal Area of the Ngebel Volcano Complex Ponorogo, East Java, Indonesia
Author(s) -
Dwi Fitri Yudiantoro,
Ratnaningsih Ratnaningsih,
Puji Pratiknyo,
Mahreni Mahreni,
Ds. Sayudi,
I. Paramitahaty,
Hafiz Hamdalah,
Mirzam Abdurrachman,
Isao Takashima,
W. Ismunandar,
Ros Fatihah Muhammad,
D.G. Sampurno
Publication year - 2021
Publication title -
rsf conference proceeding series. engineering and technology
Language(s) - English
Resource type - Journals
eISSN - 2809-6843
pISSN - 2809-6878
DOI - 10.31098/cset.v1i1.378
Subject(s) - geology , pyroclastic rock , lava , volcano , geothermal gradient , geochemistry , lava dome , basalt , petrography , hydrothermal circulation , impact crater , basaltic andesite , volcanic gases , petrology , volcanic rock , andesite , seismology , geophysics , astrobiology , physics
The Ngebel geothermal area is morphologically in several volcanic cones arranged as lava domes, volcanic hills, and lake craters. Volcanic cones are composed of lava, pyroclastic falls, pyroclastic flows, volcanic cones such as Jeding Volcano, Kemlandingan Volcano, Manyutan Volcano, and Ngebel Volcano. The magmatism activity that occurs in this area is andesitic-dacitic and also forms a geothermal system. This geothermal system is estimated to produce 50 MWe. During the formation of a geothermal system, hydrothermal fluids interact with the surrounding rock. Based on the results of geological mapping, petrographic analysis, and analysis of rare earth elements. In general, the results of rock-fluid interactions show a decrease in the concentration of rare earth elements, both light and heavy REE elements, from andesite basaltic samples to cold water samples. However, an unexpected reduction from 10 times chondrite to 0.3 times chondrite from hot water to cold water. This research will contribute to the hydrothermal alteration process in the research area that previous researchers have never done and expect to provide new information about forming the geothermal system in the Ngebel Volcanic Complex area.