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All Journal Techno LPPM Journal of Earth and Marine Technology (JEMT)
Karlina, Nur Alif Yusuf Putra
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation

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Hydrostructure of Groundwater Manifestation of Gedongsongo Geothermal Ungaran, Semarang, Central Java, Indonesia Hisan, Nazwa Khoiratun; Jasaputra, Ludovikus Damardika; Bernaldo, Pius Artdanno; Karlina, Nur Alif Yusuf Putra; Arhananta, Arhananta
Journal of Earth and Marine Technology (JEMT) Vol 1, No 1 (2020)
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.2020.v1i1.1150

Abstract

Groundwater is an important element of the hydrological cycle in geothermal systems. The geological structure of the Plio-Pleistocene volcano and different lithological variations affect the type and response of groundwater to rocks. The research area is located around the Gedongsongo Temple complex, Mount Ungaran, Central Java. Based on the field check location, there are three variations of lithology, the first lithology is a breccia with andesite, basalt, and pyroclastic fragments. The NW-SE-oriented geological structure is flattened to the right slip fault which is the fracture aquifer system on the Southern Slope of Mount Ungaran. In the research area, there is an anomaly in the form of deflection of flow direction pattern caused by structural control factor in the form of fracture, the fracture which becomes the fluid channel media is a tension joint on the shear zone with Northwest strike with dip direction toward Northeast which has NW-SE orientation of right slip fault.
Geology And Geological Models Of Nickel Laterite Deposit Gag Island, West Waigeo District, Raja Ampat Regency, West Papua Province Harjanto, Agus; Prasongko, Bambang Kuncoro; Santoso, Joko; Hadi, Waluyo; karlina, Nur Alif Yusuf Putra
Journal TECHNO Vol. 8 No. 2 (2022): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v8i2.8217

Abstract

The location of the research is on Gag Island, West Waigeo District, Raja Ampat Regency, West Papua Province which is the area of PT. Nickel Gag. Based on the research flow chart, there are 3 main stages, namely data acquisition, data analysis, and synthesis. Physiography Gag Island is part of North Maluku (Northern Moluccas) which is included in the Raja Ampat Group. The drainage pattern found in the study area is the sub-dendritic alteration flow pattern (SDND). Geomorphology in the study area found denudational hills consisting of weak undulating hills D1, strong D2, and strongly eroded valleys D3. Lithology in the study area consists of 3 rock units, namely peridotite unit (Jp), dunite unit (Jd), and serpentinite unit (Js). The geological structure in the study area consists of the left horizontal fault of Gag 1 and 2, the right horizontal fault of Gag, paired joints, and veins. The geological model of Gag Island nickel laterite deposit consists of a bedrock model that affects the quality of nickel laterite deposits with a grade of 2-1.8% in harzburgite and dunite rocks; a slope model that affects laterite thickness with very gentle-slightly steep slopes >22 meters thick on harzburgite lithology; the geological structure model that influences the permeability of the bedrock with the presence of garnierite and chrysoprase mineralization in the fracture and help the leaching process. The exploration model is an application or application of a scientifically based geological model, besides that the exploration model is used as a command in finding exploration targets. Geological clues are used as an approach to search for nickel laterite deposits in the form of indications of flow patterns, geomorphology, lithology, geological structures, magmatogenic, and surrounding relationships.
Co-Authors Agus Harjanto Arhananta, Arhananta Bernaldo, Pius Artdanno Hisan, Nazwa Khoiratun Jasaputra, Ludovikus Damardika Joko Santoso Prasongko, Bambang Kuncoro Waluyo Hadi