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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Lambda: Jurnal Ilmiah Pendidikan MIPA dan Aplikasinya
Arica Nefia
Universitas Lambung Mangkurat
Agriculture, Biological Sciences & Forestry Chemistry Education Mathematics Physics Public Health Other

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Analisa Kondisi Geologi berdasarkan pemetaan permukaan Daerah Kebagoran Kabupaten Kebumen Jawa Tengah Arica Nefia; Uyu Saismana; Marselinus Untung D
Lambda: Jurnal Ilmiah Pendidikan MIPA dan Aplikasinya Vol. 5 No. 1 (2025): Lambda
Publisher : Lembaga Bale Literasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58218/lambda.v5i1.1228

Abstract

Analysis of Geological Setting based on surface mapping of Kebagoran Area, Kebumen Regency, Central Java: Kebumen is an area of subduction that originally served as an ocean floor, which later emerged due to the collision of two tectonic plates around 117 to 60 million years ago, specifically the Eurasian continental plate and the Indian oceanic plate Asikin.S. (1992). The Kebagoran area in Pejagoan Subdistrict, Kebumen Regency, Central Java Province, is an area consisting of hills and plains that extend in a generally west-east direction, and is within the South Serayu Mountains Zone. Research on geological conditions to determine several aspects, namely including geomorphology, stratigraphy, and geological structure, locally. The research method used is by conducting surface mapping, laboratory and studio analysis stages. surface mapping by taking direct measurements in the field, laboratory analysis using thin incisions of rocks and micropaleontology, studio analysis by analyzing data and making maps. The geology of the study area has two types of geomorphological units based on morphogenesis, namely homocline hills geomorphology unit and alluvial deposits geomorphology unit. Based on lithostratigraphy, the rock units are divided into five different units based on age, from the oldest to the youngest. The geological structure in this area consists of faults with horizontal type.
Studi Kematangan Batubara Formasi Warukin Berdasarkan Analisis Geokimia dan Reflectance Vitrinite di Barito Selatan, Kalimantan Tengah Arica Nefia; Emanuel Grace Manek
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1709

Abstract

The Warukin Formation is one of the principal coal-bearing units within the Barito Basin, where coal quality and maturity are strongly influenced by local geological conditions and thermal history. This study aims to determine the coal maturity level of the Warukin Formation in South Barito, Central Kalimantan, through the integration of geochemical analyses and vitrinite reflectance measurements. The methods employed include proximate and ultimate analyses, as well as vitrinite reflectance (Ro) measurements on four coal seams (Seams A, B, C, and D). Proximate analysis results on a dry mineral matter free (dmmf) basis indicate fixed carbon values ranging from 52.41–56.07%, volatile matter from 43.93–47.59%, and calorific values between 11,003.64–11,500.54 cal/g. These parameters consistently classify all seams as Subbituminous A coal rank according to ASTM standards. Vitrinite reflectance measurements show average Ro values ranging from 0.37% to 0.61%, generally corresponding to the Subbituminous rank, with localized increases up to High Volatile Bituminous C in Seam A. These findings indicate that the coal of the Warukin Formation in the study area exhibits low to moderate maturity, with localized variations in thermal maturity. The integration of geochemical data and vitrinite reflectance analysis proves effective in evaluating coal maturity and provides an important basis for assessing coal quality and utilization potential within the Barito Basin.
Co-Authors Emanuel G. Manek Marselinus Untung D Uyu Saismana