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All Journal Journal of Applied Geology Berita Sedimentologi Jurnal Ilmiah Geologi pangea Prosiding Seminar Nasional Rekayasa dan Teknologi (TAU SNAR- TEK) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Salahuddin Husein
Department Of Geological Engineering – Universitas Gadjah Mada, Indonesia
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science

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Petrology and Geochemistry of Microgabbro in Watugajah Area, Gedangsari, Southern Mountains Evi Kurniawati; Nugroho Imam Setiawan; Salahuddin Husein
Jurnal Geologi dan Sumberdaya Mineral Vol. 24 No. 3 (2023): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v24i3.715

Abstract

An intrusive igneous rock with a columnar joint structure having a height of approximately 55 m cropped out in the Watugajah area, Gedangsari, Gunung Kidul Regency, Yogyakarta Special Province. This region geologically is in the western part of the Southern Mountains, part of the Baturagung Subzone, which belongs to the Kebo Formation. This study aims to characterize the igneous rock in the Watugajah area of the Southern Mountains. It suggests the petrogenetic information of this igneous rock and gives a new consideration of the geological history in the Kebo Formation.Geological field mapping was managed in the research area to identify the correlation with other rock units. Rock samples were collected to characterize their composition by petrographical and geochemical analyses. The results suggest the igneous rocks intruded sedimentary rocks of the Kebo Formation, which consists of intercalations coarse sandstone and tuff, fine sandstone and siltstone, and tuff and fine sandstone units. The igneous rocks are classified as microgabbro and basalt in the form of the sill and dyke intrusions. The microgabbro and basalt consist of plagioclase, clinopyroxene, and magnetite, formed by the cooling of magma in the shallow depths. Based on geochemical studies, the igneous rocks of the Watugajah area were formed by subduction zone tectonic setting with the tholeiitic affinity. Keywords: Gedangsari, microgabbro, Southern Mountains, subduction, Watugajah.
Excavation Method of Rock Masses at the Matenggeng Dam, Indonesia Valentino Ilham Afandi; I Gde Budi Indrawan; Salahuddin Husein
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.103735

Abstract

This paper presents the results of engineering geological investigations and determination of rock mass excavation methods in the main dam area of Matenggeng Dam. The study was carried out through engineering geological mapping, core drill evaluation and supported by laboratory test data. Classifications of rock masses were carried out based on the Geological Strength Index (GSI) and Rock Mass Rating (RMR) to analyze the excavation method. The results showed research area consisted of lithology in the form of andesite, intercalation sandstone - gravelly sandstone unit, intercalation sandstone - siltstone unit, and alluvium deposits. However, at the main dam area consists of lithology in the form of intercalation sandstone-siltstone unit and intercalation sandstone-gravelly sandstone unit. The rock masses at the main dam excavation line have a weathering degree from moderately to complately weathered. Intact rocks have Uniaxial Compressive Strength (UCS) values ranging from 1-50 Mpa and are a category of extremly weak to moderate rocks. The rock mass of intercalation sandstone-siltstone with very poor to poor quality (GSI (0 - 58), RMR (8 - 45)), and intercalation sandstone-gravelly sandstone with poor to fair quality (GSI (20 - 59), RMR (20 - 68)). The recommended rock excavation method based on the EXCASS System is diggir, easy ripper, and hard ripper.
Co-Authors Akmaluddin Akmaluddin Aldo Febriansyah Putra Astuti, Wahyu Banti T.Tampubolon Didit Hadi Barianto Donatus Hendra Amijaya Dwikorita Karnawati Evi Kurniawati I Gde Budi Indrawan Jarot Setyowiyoto Junji Kiyono Kiyono, Junji Kyaw, Zaw Lin Leo Agung Prabowo Muhammad I.Novian Muhammad Virgiana A Muhammad Virgiawan Agustin Nomensen Ricardo Nugroho I. Setiawan Nugroho Imam Setiawan Rahmadi Hidayat Rahmat Rahmat Ricardo, Nomensen Rohmana, Rian Cahya Samodra, Saptono Budi Sismanto Sismanto Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Sudarno, Ignatius Sugeng Sapto Surjono Sunjaya E.S. Teuku Faisal Fathani Teuku Faisal Fathani Valentino Ilham Afandi Wahyu Wilopo Yohanes Ardhito Triyogo Varianto Yosse Indra Zaw Lin Kyaw