MODEL KONSEPTUAL PANASBUMI KOMPLEK GUNUNGAPI NGEBEL, KECAMATAN NGEBEL, KABUPATEN PONOROGO, PROVINSI JAWA TIMUR

ISMUNANDAR, WISNU (2022) MODEL KONSEPTUAL PANASBUMI KOMPLEK GUNUNGAPI NGEBEL, KECAMATAN NGEBEL, KABUPATEN PONOROGO, PROVINSI JAWA TIMUR. Masters thesis, UPN "Veteran" Yogyakarta.

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Abstract

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SARI
Sari
Daerah Komplek Gunungapi Ngebel (NVC) merupakan gunung api Kuarter
dengan potensi panasbumi diperkirakan sebesar 50 MWe. NVC terdiri dari
Gumuk Jeding, Gumuk Kemladingan, Gumuk Manyutan dan Gumuk Ngebel.
Batuan piroklastik yang menyusun adalah batuan piroklastik aliran, batuan
piroklastik jatuhan dan lava. Berdasarkan urutan stratigrafi, evolusi magmatisme
NVC dapat disusun, mulai dari tipe magmatik tertua hingga termuda, yaitu batuan
vulkanik dengan komposisi basalt andesitik, andesit piroksen, andesit hornblenda
dan dasit. Afinitas kalk-basa busur pulau ditunjukkan oleh anomali negatif yang
besar pada unsur Nb yang mencirikan proses magmatisme yang terbentuk pada
tatanan tektonik busur kepulauan. Manifestasi panas bumi yang ditemukan di
daerah penelitian berupa mata air panas, kolam lumpur, dan batuan yang
mengalami alterasi hidrotermal. Manifestasi air panas dan kolam lumpur dengan
suhu 55-72oC dengan pH asam-netral. Hasil perhitungan geotermometer
menunjukkan bahwa temperatur reservoir berkisar antara 264-304°C. Metodologi
penelitian adalah pemetaan lapangan, analisis petrografi, analisis X-Ray
Fluorences (XRF), analisis Induced Coupled Mass Spectrometry (ICP-MS),
analisis Induced Coupled Mass Spectrometry (ICP-OES) dan analisis Atomic
Absorption Spectrometer (AAS). Berdasarkan data geologi, data geokimia batuan
dan fluida, yang dilakukan dalam dalam penelitian ini dan didukung oleh data
geofisika dari penelitian terdahulu yang berada ditimur daerah penelitian,
kemudian disusun model tentatif konseptual sistem panas bumi yakni meliputi
Sumber Panas berasal dari aktifitas vulkanisme kawah Ngebel (Gumuk Ngebel)
yang masih aktif, Reservoir yang berasal dari Formasi Batuan Sedimen Tersier,
Batuan penudung yang berasal dari formasi batuan yang menyusun Gumuk Jeding
yang didominasi oleh lava basalt andesitik dan breksi piroklastik aliran Jalur
Migrasi Manifestasi yakni yang berasal dari kelurusan struktur patahan yang
menerus disepanjang lokasi manifestasi panasbumi yang berorientasi NE-SW.
Hasil penelitian ini diharapkan dapat memberikan data baru untuk kegiatan
eksplorasi saat ini di Indonesia.
Kata kunci: piroklastik, lava, fluida, manifestasi, panasbumiix
Abstract
The NVC area is a Quaternary volcano with an estimated geothermal potential of
50 MWe. NVC is composed of Jeding Hummock, Kemladingan Hummock,
Manyutan Hummock and Ngebel Hummock. Pyroclastic rocks that make up flow
pyroclastic rocks, falling pyroclastic rocks and lava. Based on the stratigraphic
sequence, the evolution of NVC magmatism can be arranged, starting from the
oldest magmatic type to the youngest, namely volcanic rocks with andesitic basalt,
andesite (pyroxene), andesite (hornblende) and dacite compositions. The calcalkaline affinity of the island arc is indicated by the large negative anomaly in the
Nb element which characterizes the magmatism process formed in the island arc
tectonic setting. Geothermal manifestations found in the study area are in the
form of hot springs, mudpools, and rocks undergoing hydrothermal alteration.
Manifestations of hot water and mudpool with a temperature of 55-72oC with an
acid-neutral pH. The results of the geothermometer calculation show that the
reservoir temperature is around 264-304°C. The research methodology is field
mapping, petrographic analysis, X-Ray Fluorences (XRF), Induced Coupled Mass
Spectrometry (ICP-MS) analysis, Induced Coupled Mass Spectrometry (ICP-OES)
analysis and Atomic Absorption Spectrometer (AAS) analysis. Based on
geological data, rock and fluid geochemical data, which were carried out in this
study and supported by geophysical data from previous studies located in the east
of the research area, a conceptual model of the geothermal system was compiled
which includes heat sources derived from volcanism activity in the Ngebel crater
(Ngebel Hummock) which is still active, Reservoir originating from Tertiary
Sedimentary Rock Formation, Cap rock originating from the rock formations that
make up Jeding Hummock which is dominated by andesitic basalt lava and
pyroclastic breccia flows; The Manifestation Migration Path is derived from the
straight line of fault structures along the NE-SW orientation of the geothermal
manifestation location. The results of this study are expected to provide new data
for current exploration activities in Indonesia.
Keywords: pyroclastic, lava, fluid, manifestation, geothermal

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	piroklastik, lava, fluida, manifestasi, panasbumi
Subjects:	Q Science > QE Geology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Geography
Depositing User:	Eko Yuli
Date Deposited:	12 Jan 2022 04:49
Last Modified:	26 Oct 2022 01:19
URI:	http://eprints.upnyk.ac.id/id/eprint/27750

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