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All Journal Jurnal Ilmiah MTG Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Journal of Earth and Marine Technology (JEMT) Journal of Applied Geology Jurnal Ilmiah Geologi pangea Jurnal Ilmiah Geomatika
Pratomo, Septyo Uji
Teknik Geologi UPN Veteran Yogyakarta
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Physics Transportation

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Journal : Journal of Earth and Marine Technology (JEMT)

 1 
Petrogenesis of Andesite Rocks in Datae Area, Sidenreng Rappang Regency, South Sulawesi Province Sayidatina Hayatuzzahra; Septyo Uji Pratomo
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4695

Abstract

The research area is in the Datae Area, Watangpulu District, Sidenreng Rappang Regency, South Sulawesi Province. This study aims to determine the distribution of volcanic rocks, determine the crystallization phase based on petrographic analysis, and determine the type, magma affinity and tectonic environment based on geochemical data. The method used in this study was field data collection and rock sampling for analysis through petrographic analysis and geochemical analysis using the X-Ray Fluorescence (XRF) method by analysing the main elements, trace elements and rare earth elements (REE). The results of the petrographic analysis show that the rocks found in the field are volcanic breccia and ignimbrite. Volcanic breccia showed coarse-grained texture composed of angular to rounded andesite fragments and pyroclastic material fused together in a matrix. Meanwhile, ignimbrite showed fine grained texture with lapilli to boulder-sized fragments, poor sorting, open-packed and non-layered structure. Based on the Total Alkali Silika (TAS) diagram, AFM diagram, and binary diagram, the results of the geochemical analysis showed that the rocks found in the study area were andesite and trachy-andesite, while the magma affinity area is high-K calc-alkaline and shoshonitic. High-K calc-alkaline magmas are associated with subduction zones and are characterized by elevated levels of potassium and aluminum, while shoshonitic magmas are typically found in intraplate or back-arc settings, characterized by their distinctive potassium, sodium, and barium-rich compositions. The results from ternary diagram and geochemical Spider plots proved that the magma tectonic environment is island arc—continental arc basalt, indicating that the rock was formed in a subduction area. This research supports previous research regarding the tectonics of the western arm of Sulawesi, which stated that this area was formed by subduction.
Depositional Environment Characteristic of The Late Miocene Kerek Formation in Kendeng Basin: A Case from Cipluk Area, Kendal Regency, Central Java Joseph Emmanuel Ardine; Septyo Uji Pratomo; Carolus Prasetyadi; M. Ocky Bayu Nugroho; Aga Rizky; Yohanes Citra Kristanto; I Nyoman Agus Dharma Manggala
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4830

Abstract

This study focused on the Late Miocene Kerek Formation in Cipluk, Kendal Regency, Central Java, which belongs to the Kerek Formation, a lithostratigraphy unit characterized by Early Miocene - Late Miocene turbidite deposits. The research aims to comprehensively interpret the depositional environment characteristics of the Late Miocene Kerek Formation based on lithofacies, thin section analysis, and micropaleontological analysis. Gaining insights into facies characteristics and the depositional environment will offer novel perspectives for the exploration and development of oil and gas resources in the Kendeng basin. The methodology consists of data collection, analysis, and synthesis. Results indicate that the study area is dominated by classical turbidite facies, suggesting a distal zone with slow sediment settling. The analysis reveals that the Late Miocene Kerek Formation was deposited in a deep marine environment within the inner bathyal—outer bathyal bathymetry zone, specifically in the lower fan section of a submarine fan system. Based on the characteristics of existing deposits and facies, the deposition environment is identified as a fine-grained, mud-rich complex in an elongated submarine fan. These findings contribute to a better understanding of the Late Miocene depositional environment in the Kendeng Basin, Central Java.
Co-Authors Afrilita Afrilita Afrilta Afrilita Aga Rizky Anastasia Dewi Titisari Apriliani, Siska Arifudin Idrus Arifudin Idrus Brigita Nadya Eman Carolus Prasetyadi Dian Rahma Yoni, S.T., M.T. Eman, Brigita Nadya Ezza Ray Raditya Prasetyo Fahrudin Yusuf Saputro Galih Purnama Parikesit Huzaely Latief Sunan Huzaely Latief Sunan I Nyoman Agus Dharma Manggala Idarwati Idarwati Idham Khaliq Yudhistira Intan Paramita Haty Joseph Emmanuel Ardine Kasih Septiani M. Ocky Bayu Nugroho Prasetyo, Ezza Ray Raditya Puthut Prihartono Ra Mauldy Pabhayita Noval Sayidatina Hayatuzzahra Septiani, Kasih Setia Pambudi Setia Pambudi Siska Apriliani Sunan, Huzaely Latief Thema Arrisaldi Titisari, Anastasia Dewi Yohanes Citra Kristanto