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Journal of Earth and Marine Technology (JEMT)
Published by Institut Teknologi Adhi Tama Surabaya
ISSN : -     EISSN : 27238105     DOI : https://doi.org/10.31284/j.jemt
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation
Earth Science and planetary, Geology, Geochemistry, Geophysics, Geodesy, Geomatics, Geotech, Rock mechanics, Mining engineering, Natural Disaster, Land and ocean development, Natural resources, Environmental science, Social impact of mining and marine activity, Science and technology in mapping and surveying, Optical remote sensing and radar remote sensing, Cadastre and 3D modeling, Geodynamics theory and application, Geospatial, Land Surveying, Geomarine, Photogrammetry, Marine engineering
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 4 Documents
 1 
Search results for , issue "Vol 6, No 1 (2025)" : 4 Documents clear
Facies and Architectural Element Analysis of Braided Fluvial Succession : The Paleogene Cawang Member, Ogan Komering Ulu Selatan Area , South Sumatra Daryono, Sapto Kis; Kartika, Andi; Saktiawan, Tridadi
Journal of Earth and Marine Technology (JEMT) Vol 6, No 1 (2025)
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.2025.v6i1.8097

Abstract

The Cawang Member of the Kikim Formation plays an important role in understanding the Paleogene sedimentary development of the Palembang Subbasin due to its presence as a pre-rift deposit that occurred before or simultaneously with the formation of the basin. Interpretations of the stratigraphic evolution of the Paleogene succession are based on detailed surface geological mapping, particularly through lithofacies identification and depositional environment analysis. These observations reveal that the lithological characteristics and facies distribution of the Cawang Member record dynamic sedimentary processes associated with early basin evolution. Facies analysis was conducted along measured stratigraphic sections encompassing conglomerate–sandstone 1 and sandstone 1-sandstone units exposed along the Bumi Agung and Batu Belang traverses in the South Ogan Komering Ulu area, South Sumatra. The conglomerate-sandstone 1 and sandstone 1-sandstone units attains a thickness of approximately 158.82 m, and about 177.50 m. A total of nine lithofacies were identified, including matrix-supported massive gravel (Gmm), matrix-supported, gravel (Gmg), massive gravel (Gm), massive sandstone (Sm), horizontally bedded sandstone (Sh), low-angle cross-bedded sandstone (SI), carbonaceous mud (C), massive fine sandstone-silt-mud (Fm), and massive siltstone and mudstone (Fsm). These lithofacies are grouped into four main facies associations: gravel bars (GB), sandy bedforms (SB), channels (CH), and overbank fine (FF). The assemblage of facies associations indicates deposition within a fluvial system dominated by braided river processes, with localized influence of sediment gravity flows
Geomorphological Study of the Samigaluh Area and Its Surroundings, Kulon Progo Regency, Yogyakarta Azzahra, Fadea Risa; Setiawan, Budhi
Journal of Earth and Marine Technology (JEMT) Vol 6, No 1 (2025)
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.2025.v6i1.8650

Abstract

Samigaluh District and its surrounding areas, Kulon Progo Regency, Special Region of Yogyakarta, form part of the Kulon Progo Mountains, which lie within the eastern segment of the Southern Serayu Mountains zone. This region exhibits complex geomorphological conditions resulting from the interaction of tectonic activity, volcanism, and ongoing denudational processes. This study aims to provide knowledge and benefits for relevant stakeholders and readers, thereby supporting related scientific fields and areas of expertise. The research method involved field observations combined with analyses using Geographic Information Systems (GIS) and Digital Elevation Model (DEM) data. Geomorphological characteristics were analyzed by correlating drainage patterns, slope gradients, and lithological units to identify landform features within the study area. The results indicate that the geomorphic units in the Samigaluh area consist of Volcanic Denudational High Hills, representing remnants of ancient volcanic edifices that have undergone prolonged weathering and erosion over geological timescales; Intrusive Hills, formed by the intrusion of igneous rocks into surrounding strata and subsequently exposed by erosion; and Karst High Hills, which developed predominantly through carbonate dissolution processes. The diversity of these geomorphic units reflects the strong influence of geological dynamics on the landscape evolution of the study area.
Petrology and Geochemistry of Volcanic Rocks of Kaba Volcano, Bengkulu Wijaya, Muhammad Eval Juni; Mentari, Sakila Gia; Pratama, Ridho Ramadhan; Sitohang, Victor Ranson
Journal of Earth and Marine Technology (JEMT) Vol 6, No 1 (2025)
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.2025.v6i1.8571

Abstract

Mount Kaba is an active stratovolcano in Bengkulu Province, Indonesia, characterized by explosive magmatic eruptions and the presence of monogenetic volcanic centers, reflecting complex magmatic processes. This study focuses on the northern sector of the Mount Kaba area to investigate magma evolution and its relationship to volcanic development and hazard mitigation. Fifteen representative lava and pyroclastic rock samples were analyzed using petrographic observations and ICP-MS geochemical methods to determine major, trace, and rare earth element (REE) compositions. Petrographic results indicate basaltic to andesitic rocks with hypocrystalline textures, dominated by plagioclase, pyroxene, olivine, hornblende, and displaying porphyritic, trachytic, sieve, zoning, intersertal, and reaction rim textures that reflect disequilibrium processes and multi-stage magma evolution. Geochemically, rocks range from basanite/tephrite to dacite and belong mainly to calc-alkaline to high-K calc-alkaline magma affinities, forming two magma groups (Danau Mas and Kaba). Major element Harker diagrams show decreasing MgO, CaO, FeO, TiO₂ with increasing SiO₂ and increasing Na₂O + K₂O, indicating progressive differentiation. Trace element diagrams display positive trends of LILE and HFSE with SiO₂ and dual magma trends, suggesting multiple differentiation histories. Spider diagrams reveal LILE enrichment, HFSE depletion, and LREE enrichment relative to HREE, consistent with subduction-related magma sources. Integration of petrographic and geochemical data indicates that magma evolution was dominated by fractional crystallization, with additional influences from assimilation and magma mixing that produced compositional diversity and disequilibrium textures. Overall, the Mount Kaba magmatic system reflects a dynamic subduction zone environment characterized by multiple magma sources, progressive differentiation, and complex interactions within the crust, with implications for understanding volcanic processes and hazard potential in the northern sector.
Micropaleontological Analysis of Planktonic and Benthic Foraminifera from the Claystone Member of the Bayah Formation (Tebm) and the Limestone Member of the Cijengkol Formation (Tojl), Jatake Area, Lebak Regency, Banten Province Ahmad, Salsabiila Fadhilah; Febrim, Dwi Vina; Harnani, Harnani
Journal of Earth and Marine Technology (JEMT) Vol 6, No 1 (2025)
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.2025.v6i1.8822

Abstract

Micropaleontological analysis of planktonic and benthic foraminifera from three rock samples—muddy micrite, allochemic sandstone, and wackestone—was carried out to determine the relative age and depositional environment of the Claystone Member of the Bayah Formation (Tebm) and the Limestone Member of the Cijengkol Formation (Tojl) in the Jatake area, Lebak Regency, Banten Province, Indonesia. A total of 43 foraminiferal specimens were identified, including 28 planktonic and 15 benthic individuals. These were used for biostratigraphic and paleoenvironmental interpretation. The results show that the Claystone Member Tebm (RL19) dates to the Middle Eocene, mainly within planktonic foraminiferal biozones P14–P15, which falls under a wider P14–P17 range. In contrast, the Limestone Member Tojl is younger, with sample RL85 assigned to the Late Oligocene (N1–N3) and sample RL23 corresponding to the Late Oligocene to earliest Miocene interval (N3–N4). Benthic foraminiferal groups from all samples suggest deposition in outer neritic to upper bathyal environments. The estimated paleobathymetric ranges are about 390–1100 ft for RL19, 350 - 1630 ft for RL85, and 390 - 1230 ft for RL23. Even though the ages differ, the similarity in depositional environments hints at comparable marine bathymetric conditions in the study area. The differences in age suggest that the Bayah Formation and the Cijengkol Formation represent different depositional phases instead of a continuous stratigraphic sequence. This finding offers important insights into the stratigraphic framework and depositional evolution of the Bayah Dome region.

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