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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 Journal of Geoscience, Engineering, Environment, and Technology PROMINE Jurnal GEOSAPTA Social, Humanities, and Educational Studies (SHEs): Conference Series 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 Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Public Health Social Sciences

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Journal : Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir

 1 
Tataan Tektonika Batuan Gunung Api di Komplek Adang Kabupaten Mamuju Provinsi Sulawesi Barat Sukadana, I Gde; Harijoko, Agung; Setijadji, Lucas Donny
EKSPLORIUM Vol. 36 No. 1 (2015): MEI 2015
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2015.36.1.2769

Abstract

Adang volcanic complexlocated in Mamuju Region, West Sulawesi can be grouped more detail into seven complexes that are Tapalang, Ampalas, Adang, Malunda, Karampuang, Sumare, and Labuan Rano. Adang complex is one of the main volcanic complexes that still can be identified with good morphological formations. This complex is composed of alkaline volcanic rocks with basic to intermediates composition that have high value of radiation dose rate caused by their radioactive mineral content. Radioactive mineral occurrences on the basaltic-andesitic rocks has never been found in Indonesia, so it becomes very interesting to do research mainly tectonic settings of the volcanic rock complex formation. The purpose of this study is to determine magmatiic typology related with the tectonic setting based on volcanic rock geochemistry using X-Ray Fluorences (XRF) analysis. Adang volcanic rock is the result of a complex process of volcanism having a volcanic center and several lava domes. They are composed of phonolite to dacite rock, with ultrapotassic affinity, interpretation of data concluded that tectonic setting of magmatism formed in active continental margin (ACM). Magmatism source from vulcanic activities influenced by South WestSulawesi micro-continental crust.
Volcanic Ash Fall Hazard of Mount Merapi on Yogyakarta Nuclear Area Setiaji, Abimanyu Bondan Wicaksono; Satyarno, Iman; Harijoko, Agung
EKSPLORIUM Vol. 43 No. 2 (2022): NOVEMBER 2022
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2022.43.2.6708

Abstract

The existence of nuclear installations in the Yogyakarta Nuclear Area is vulnerable to the eruption of Mount Merapi, the most active volcano in Indonesia. Tephra hazard has the potential to threaten the operational activities of nuclear installations in the Yogyakarta Nuclear Area; thus, it is necessary to analyze the distribution and potential hazard of volcanic ash from Mount Merapi for future eruptions. Numerical modelling is used in analyzing tephra distribution using TEPHRA2 software with parameters of the 2010 Mount Merapi eruption, which is then visualized to isomass and isopach maps of tephra distribution. The analysis resulted in the ash dispersion leading to the Yogyakarta Nuclear Area in April, May, June, and August with an accumulated mass of 20-50 kg/m3 with a thickness of 0.2-12 cm. It is necessary to deal with volcanic ash hazards such as roof strength, secondary cooling system, filtering system, and electrical system for several installations in the Yogyakarta Nuclear Area.
Magmatic Evolution of Dago Volcano, West Java, Indonesia Adimedha, Tyto Baskara; Harijoko, Agung; Handini, Esti; Sukadana, I Gde; Syaeful, Heri; Ciputra, Roni Cahya; Rosianna, Ilsa; Indrastomo, Frederikus Dian; Pratiwi, Fadiah; Rachael, Yoshi
EKSPLORIUM Vol. 44 No. 1 (2023): MAY 2023
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2023.6873

Abstract

Dago Volcano is a product of Miocene Sunda Arc volcanism located southeast of the capital city of Jakarta. The morphological change from flat lava flow to steeper lava morphology implies a process of magma evolution under Dago Volcano. This research provides an overview of the magma evolution that occurs on this volcano. The methods used include volcanostratigraphic analysis, petrographic analysis, mineral chemistry, and whole-rock geochemistry. The volcanostratigraphy of Dago Volcano is composed of two eruption centers and a flank eruption forming lava and cinder cones products. The mineralogical associations of Dago Volcano products include plagioclase, olivine, and clinopyroxene. The mineral textures of Dago edifices show zoning, sieve, and reaction rims textures. Geochemically, the Dago Volcano product has a magma affinity of med-K calc-alkaline with quite high levels of MgO, Ni, and Cr approaching the characteristics of primitive magma. The magma evolution process of Dago Volcano includes fractional crystallization and magma mixing which originates from the same magma source.
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.
Co-Authors Abdissalam, Rus Adimedha, Tyto Baskara 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 FX Anjar Tri Laksono Gloria Bayu Nusa Prayuda 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 Wayan Warmada Imai, Akira Iman Satyarno Indra Agus Riyanto Indranova Suhendro Irwan Endrayanto, Irwan Irzal Nur, Irzal 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 Maulana Rizki Aditama Miftahul Huda 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 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 Yasushi Mori Yonezu, Kotaro Yonezu, Kotaro