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All Journal Indonesian Journal of Geography Reaktor IJOG : Indonesian Journal on Geoscience Journal of Degraded and Mining Lands Management Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal Ilmiah Dinamika Rekayasa (DINAREK) UNEJ e-Proceeding Science and Technology Indonesia Journal of Geoscience, Engineering, Environment, and Technology PROMINE Jurnal GEOSAPTA Indonesian Journal on Geoscience Jurnal Geosains dan Remote Sensing (JGRS) Indonesian Journal on Geoscience Journal of Applied Geology Jurnal Pengabdian, Riset, Kreativitas, Inovasi, dan Teknologi Tepat Guna (Parikesit) Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Agung Harijoko
Departemen Teknik Geologi, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Public Health Social Sciences

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Characteristics and Genesis of Mount Pengki: A Scoria Cone of Dago Volcano, West Java, Indonesia Adimedha, Tyto Baskara; Ciputra, Roni Cahya; Rosianna, Ilsa; Sukadana, I Gde; Harijoko, Agung; Handini, Esti; Pratiwi, Fadiah; Indrastomo, Frederikus Dian; Syaeful, Heri; Rachael, Yoshi; Sukmawan, I Gusti Made
EKSPLORIUM Vol. 45 No. 2 (2024): NOVEMBER 2024
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2024.7131

Abstract

Scoria cones are a typical product of volcanic activity constructed by the bomb and lapilli-sized pyroclasts formed by Strombolian eruption. Mount Pengki is a scoria cone found in Miocene Dago Volcano, West Java. Mount Pengki was a remnant of a Miocene volcano that was exceptionally well preserved and exposed. This scoria cone contains layers of scoria beds and a lava flow unit. The study aims to characterize the exposed scoria bed deposits and investigate the eruptive history and degradation process of Mount Pengki. Field observation, including measured sections and detailed characterizations of the Mount Pengki quarry, allows us to observe its volcanic sequence from its internal structure toward the surface. Morphometric analysis of Mount Pengki can describe the degradation process undergone by the scoria cone. The early phase deposits were characterized by massive to weakly bedded, poorly sorted, clast-supported beds mainly composed of coarse lapilli to bombs/blocks scoria grain. The middle phase deposit typically shows well-stratified, well-sorted, clast-supported scoria beds with coarse ash to coarse lapilli grain size. The late phase deposit is similar to the middle phase deposit, with additional features of coarser-grain, reverse grading, and clast-supported lenticular beds. Eruptive mechanisms involved in the formation of Mount Pengki include ballistic transport of clasts, fallout deposition, and grain avalanching process. The degradation process was likely influenced by prolonged exposure to weathering, cone rim collapse, and regional deformation processes.
The Knowledge Driven as Fundamental Analysis in The Geothermal Exploration Activity: Dieng Geothermal Field Study Area Hardiyanto, Dwi Wahyu; Setianto, Agung; Harijoko, Agung
Indonesian Journal of Geography Vol 57, No 3 (2025): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.102388

Abstract

Geothermal exploration activities involve a high degree of uncertainty and financial risk, thereby requiring exploration analyses that can support accurate decision-making. This study presents a geothermal exploration method for determining the Geothermal Potential Index (GPI) by integrating surface geological, geophysical, and geochemical data.  The main problem addressed in this study is the testing of a method for conducting geothermal exploration by integrating multiple parameters. Accordingly, this research applies a knowledge-driven approach through the Analytic Hierarchy Process (AHP) to develop a tentative Geothermal Potential Index (GPI) model. The Analytical Hierarchy Process (AHP) serves as a reliable methodological framework for assessing the Geothermal Potential Index by integrating newly obtained and pre-existing data. By incorporating suitability analysis, identifying prospective resources, and formulating geothermal resource criteria, this approach establishes a solid basis for systematic evaluation during the geothermal exploration phase. The tentative model of the geothermal potential index (GPI) for the Dieng volcanic complex has been identified into five zones: Pagerkandang Zone, Siglagah Zone, Pangonan-Merdada Zone, Campursari Zone, and Pakuwaja Zone.
Petrology, Geochemistry, and Peak Pressure-Temperature Metamorphism of Pinoh Metamorphic Rocks in The Schwaner Mountains, Indonesia Nugroho Imam Setiawan; Agung Harijoko; Rahmadi Hidayat; I Gde Sukadana; Frederikus Dian Indrastomo; Isyqi
Indonesian Journal on Geoscience Vol. 13 No. 2 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.2.243-267

Abstract

The Pinoh Metamorphic Rocks in the Schwaner Mountains predominantly underwent contact metamorphism near a granitoid body, oriented E–W and NW–SE. The whole-rock geochemical analyses indicate that these metapelites are characterized by high Al₂O₃ (16.6–22.0 wt.%), moderate SiO₂ (60.0–67.7 wt.%), low CaO and Na₂O, and enrichment in large-ion lithophile elements relative to high field strength elements. Trace-element and REE patterns normalized to upper continental crust show LREE enrichment, negative Sr anomalies, and variable Zr contents, suggesting significant sedimentary recycling. Chemical weathering indices (CIA = 79–89; CIW = 89–99) and low ICV values (0.58–0.75) indicate compositionally mature pelitic to semipelitic protoliths. Provenance discrimination diagrams suggest derivation mainly from intermediate to felsic-igneous sources, with minor mafic contributions, deposited in an active continental margin to continental arc setting. Integrated petrographic, microstructural, mineral-chemical, thermobarometric, and phase equilibria analyses of samples from the Nanga Pinoh and Nanga Semalam areas reveal two main metamorphic events (M1 and M2). The M1 event formed the primary S1 foliation, whereas the M2 event is marked by the growth of andalusite porphyroblasts and the occurrence of spotted biotite. Garnet locally nucleated during late M1, but was chemically re-equilibrated during M2. Peak metamorphic conditions of the garnet–andalusite–biotite schist, estimated using garnet–biotite–andalusite–quartz (GBAQ) geothermobarometry and pseudosection modeling, yield P–T conditions of 525–586° C at 2.0–3.8 kbar, consistent with low-pressure, high-temperature Buchan-type contact metamorphism related to Cretaceous granitoid magmatism in The Schwaner Mountains.
Temperature Estimation of Geothermal Systems and Subsurface Model Based on Geochemical of Lake Ranau Mochammad Malik Ibrahim; Agung Harijoko; Wiwit Suryanto
Science and Technology Indonesia Vol. 11 No. 3 (2026): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2026.11.3.773-783

Abstract

The geothermal potential of the Lake Ranau area comes from the remnants of magmatic activity from Mount Seminung. Geothermal manifestations in this area are in the form of hot springs that are thought to emerge through geological structures. This research aims to determine the approximate temperature of the geothermal system and subsurface model based on the analysis of chemical geothermometer method. The chemical geothermometer method can be used to indirectly predict the temperature of the subsurface geothermal system. Geothermal fluid manifestations in Kota Batu Village were chemically sampled by collecting three samples (LP 1, LP 2, and LP 3) and in Lombok Village by collecting three samples (LP 4, LP 5, and LP 6). Chemical geothermometers used in the research are silica, Na/K, K/Mg and Na-K-Ca geothermometers. The results of chemical geothermometer calculations on 6 samples of geothermal fluid manifestation locations, the estimated temperature of the subsurface geothermal system in the research area ranges from 177.0 - 285.6 0C and is included in the geothermal system with medium to high enthalpy. The subsurface model based on the calculation results of various chemical geothermometers about geothermal system components such as cap rock, reservoir rock, heat source, geological structure, thermal fluid and surface manifestations.
Co-Authors Abdissalam, Rus Adimedha, Tyto Baskara Aditama, Maulana Rizki Agung Setianto Agus Hendratno Agus Winarno Agus Winarno Akira Imai Al-Furqan, Reza Anggun Purnama Edra Arifudin Idrus Asmoro Widagdo Asmoro Widagdo Asmoro Widagdo Asmoro Widagdo Asmoro Widagdo, Asmoro Ayu Safira Mariska, Nanda Ayu Safira Mariska, Nanda Azmin Nuha Bachtiar Wahyu Mutaqin Bronto, Sutikno Cahyani, Sherinna Mega Ciputra, Roni Cahya Donatus Hendra Amijaya Doni Prakasa Eka Putra Dwi Wahyu Hardiyanto Eko Bayu Purwasatriya Esti Handini Ferian Anggara Franz Michael Meyer Franz Michael Meyer, Franz Michael Frederikus Dian Indrastomo Frederikus Dian Indrastomo, Frederikus Dian FX Anjar Tri Laksono Gloria Bayu Nusa Prayuda Hardiyanto, Dwi Wahyu Harli Talla Haryo Edi Wibowo Hasenaka, Toshiaki Heri Syaeful Herlan Darmawan Heru Hendrayana Htun, Tin May Huzaely Latief Sunan I Gde Sukadana I Gde Sukadana I Gde Sukadana I Wayan Warmada Imai, Akira Iman Satyarno Indra Agus Riyanto Indranova Suhendro Irwan Endrayanto, Irwan Irzal Nur, Irzal Isyqi Jaingot A. Parhusip Jaingot A. Parhusip, Jaingot A. Juhri, Saefudin Koichiro Watanabe Koichiro Watanabe Koichiro Watanabe Koichiro Watanabe, Koichiro Kotaro Yonezu Kotaro Yonezu Lucas Donny Setijadji Mamay Surmayadi Martadiastuti, Vanadia Miftahul Huda Mochammad Malik Ibrahim Mohammad Yazid Abdillah Moktikanana, Mradipta Lintang Alifcanta Mori, Yasushi Mradipta Lintang Alifcanta Moktikanana Myo Min Tun Myo Min Tun Myo Min Tun Nanda Ayu Safira Mariska Nia Haerani Nugroho Imam Setiawan Nurkhamim Nurkhamim Okki Verdiansyah Okki Verdiansyah Okki Verdiansyah Oo, Toe Naing Pratiwi, Fadiah Prawira Sari, Shafa Hadaina Purnama Edra, Anggun Putranto, Sapto Rachael, Yoshi Rachmad Setijadi Raditya Jati Rahayu, Eti Rahmadi Hidayat Razi, Faizal Reza Al-Furqan Rodhie Saputra Rosianna, Ilsa Rus Abdissalam Rus Abdissalam Ruslisan Ruslisan Sachihiro Taguchi Saefudin Juhri Sapto Putranto Saputra, Rodhie Setiaji, Abimanyu Bondan Wicaksono Sindern, Sven Subagyo Pramumijoyo Subagyo Pramumijoyo Subagyo Pramumijoyo Subagyo Pramumijoyo Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Sukmawan, I Gusti Made Suratman Suratman Suryanto, Wiwit Sutarto Sutarto Sutarto Sutarto Sutarto Sutarto Sutikno Bronto Sutikno Bronto Sven Sindern Syarifudin Syarifudin Taguchi, Sachihiro Tin May Htun Toe Naing Oo Toe Naing Oo Toshiaki Hasenaka Tun, Myo Min Vanadia Martadiastuti Wahyudi Wahyudi Watanabe, Koichiro Wikanti Asriningrum Wiwit Suryanto Yasushi Mori Yonezu, Kotaro Yonezu, Kotaro