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Ivan Ferdian
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INDONESIA
IJOG : Indonesian Journal on Geoscience
Published by Geological Agency of Indonesia
ISSN : 23559314     EISSN : 23559306     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to internationalize the journal, The Indonesian Journal on Geoscience, which is open for papers of geology, geophysics, geochemistry, geodetics, geography, and soil science. This new born journal is expected to be published three times a year. As an international publication, of course it must all be written in an international language, in this case English. This adds difficulties to the effort to obtain good papers in English to publish although the credit points that an author will get are much higher.
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Articles 12 Documents
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Search results for , issue "Vol. 12 No. 3 (2025)" : 12 Documents clear
Regional Geodynamic Implications of Proterozoic Volcanic and Metasedimentary Sequences in The Kirana Hills, Punjab, Pakistan Talal Ahmed; Hassan, Iqra
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.437-465

Abstract

The Proterozoic volcanic and metasedimentary sequences of Kirana Hills, Punjab, Pakistan, provide critical insights into the region geodynamic evolution of the northwestern margin of The Indian Shield. This study investigates the region stratigraphy, structural framework, and lithological variations of The Kirana Complex, and analyzes fracture studies to reconstruct regional geodynamic processes. The aim of this research is placed on understanding how volcanic and metasedimentary assemblages, along with deformation patterns, reflect the tectonic settings and subsequent crustal evolution of the area dated back to approximately 870 ± 40 million years. The studied region field investigations, geological mapping, and fracture analyses were combined with factor-mapped datasets. Fracture characterization was performed using circle inventory methods for the three sites to quantify structural orientation, density, porosity, and permeability. The rose diagram interpretation for the fracture analysis study was performed using permeability, and using the circle inventory method to understand tectonic deformation and fluid movement. The findings suggest that the region is exposed to Proterozoic sequences of volcanic rocks dominated mostly by rhyolite, basalt, dolerite, quartzite, and volcanogenic slates of mostly Hachi Volcanics and Mach Super Group with distinct evidence of multiple magmatic and tectono-metamorphic phases. Field evidence of felsic-mafic associations, mineralization (hematite, limonite, micaceous hematite, jasper, and bornite), and other alterations highlight fluid-rock interaction and multiple shifts of mineralization. The fracture studies show (i). Hadda Quartzite shows N-S oriented conjugate fractures associated with compressive stress and migration of paleo-fluids; (ii). In the Buland Hill Formation, there is evidence of radial and concentric fractures around volcanic vents with mineralized joints that indicate signs of hydrothermal activity; and (iii). The Foliation-aligned fractures of The Asianwala Formation suggest the related foliation-based shear deformation. Taken together, these characteristics point to the existence of an initial history of extensional regimes associated with continental rifting, then compressional reworking and progressive deformation. This work lies in its integration of fracture analysis study with regional structural and lithological studies and mapping of site characterization during the field analysis. This approach refines existing models of Kirana by linking fracture-controlled fluid migration to broader geodynamic processes.
Explosive Signature of The April 30th, 2024 Ruang Volcano Eruption in The Sangihe Arc, Indonesia, Inferred from Erupted Material Characteristics: A Preliminary Assessment Purnamasari, Heruningtyas Desi; Saepuloh, Asep; Primulyana, Sofyan; Adriansyah, David; Prayoga, Ardy Setya; Agustiningtyas, Lestari; Wijaya, P. Hadi; Gunawan, Hendra
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.11-17

Abstract

The 2024 eruptions of Ruang Volcano in North Sulawesi, Indonesia, represent one of the most explosive and impactful volcanic events in the region's recent history. The eruption sequence, which commenced on April 16th and peaked with significant explosive episodes on April 17th and 30th, resulted in the evacuation of over 9,000 residents and demonstrated the volcano’s capacity for high-energy eruptive activity. This preliminary analysis of the April 30, 2024, Ruang Volcano eruption emphasises the importance of ejected materials—such as high-vesicular juvenile fragments, crystal-rich components, and megacrysts of amphibole (hornblende)—in revealing the eruption’s explosive signature. Geochemical analysis of juvenile materials indicates a basaltic andesite composition, with SiO₂ contents ranging from 53.02% to 54.27%. Petrographic examination and SEM observations reveal high vesicularity, ruptured bubble walls, and microlite-rich groundmass textures, indicative of rapid ascent and intense degassing, which facilitated efficient magma fragmentation. These features suggest that the magma underwent rapid decompression. Understanding these properties provides important clues about the mechanisms underlying the explosiveness of the Ruang eruption.

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