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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) Scientific Contribution Oil and Gas
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.
LATE CRETACEOUS SEDIMENTARY ROCK IN BARITO BASIN, INDONESIA: LITHOLOGY, PALEONTOLOGY, AND PALEOENVIRONMENT Akmaluddin Akmaluddin; Muhammad Virgiana A; Salahuddin Husein; Muhammad I.Novian; Nugroho I. Setiawan; Didit Hadi Barianto; Sunjaya E.S.; Banti T.Tampubolon
Scientific Contributions Oil and Gas Vol. 42 No. 3 (2019): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

The Barito Basin so far known as back-arc basin that formed by the rifting in Early Tertiary, which the oldest sedimentary rock in this basin is believed has a Middle Eocene to Early Oligocene age. However, this research will present new evidence regarding the existence of sedimentary rocks that are older than Cenozoic age in the Barito Basin. This research was carried out on Bongkang-2 well, as the main data, and other five wells which have an indication of the discovery of Pre-Tertiary sedimentary rocks, which are generally located in the northern part of the Barito Basin. Integration of mud log data, petrography, paleontology, and dip-meter data, resulting the identification of lithology, age and depositional environment, and then interpretation of the paleoenvironment of the Barito Basin in the Late Cretaceous is carried out. Based on the analysis of data, it is show that Pre-Tertiary sedimentary rocks found in the six wells analyzed has Cenomanian age, which is indicated by the presence of large foraminifera fossils in the form of Sulcoperculina sp. and Orbitolina sp. in Bongkang-2, Hayup-1 and Hayup-3 wells, as well as palynomorph fossils in the form of Cicatrico- sisporites dorogensis, A. tricornitatus, Aquilapollenites sp., Distaverrusporites margaritus and Classopolis cf. classoides in Bagok-1 and Bagok-2 wells. In addition, based on lithological analysis, in the Bongkang-2, Hayup-1 and Hayup-2 wells lithology develops in the form of limestone, shale and sandstone, while in the Didi-1, Bagok-1 and Bagok-2 wells lithology develops in the form of shale with sandstone and pyroclastic – volcaniclastics rock intercalation. Then, based on the integration of lithology and paleontology analysis, it is known that in the Cenomanian age, terrestrial environments developed in the western part of the Barito Basin, while in the eastern part the shallow marine environment developed.
Co-Authors Akmaluddin Akmaluddin Aldo Febriansyah Putra Astuti, Wahyu Banti T.Tampubolon Didit Hadi Barianto Donatus Hendra Amijaya Dwikorita Karnawati Evi Kurniawati 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 Rian Cahya Rohmana Ricardo, Nomensen Samodra, Saptono Budi Sismanto Sismanto Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Sudarno, Ignatius Sugeng Sapto Surjono Sunjaya E.S. Teuku Faisal Fathani Teuku Faisal Fathani Wahyu Wilopo Yohanes Ardhito Triyogo Varianto Yosse Indra Zaw Lin Kyaw