Journal of Geoscience, Engineering, Environment, and Technology <p style="text-align: justify;"><strong>JGEET (Journal of Geoscience, Engineering, Environment, and Technology) </strong>&nbsp;<strong>(E-ISSN&nbsp;: 2541-5794, P-ISSN&nbsp;: 2503-216X )</strong> is a peer-reviewed and open access journal that publishes significant and important research from area of geological science, related with engineering, environment, and technology. We accept submission from all over the world on English language. Editorial Board members are prominent and active researchers in geological sciences and engineering fields who ensure efficient, fair, and constructive peer-review process. All accepted articles will be published and available to all readers with worldwide visibility and coverage. Our Journal already <a href="">indexed </a>in DOAJ, EBSCO, SINTA, GARUDA, Indonesia One Search, Crossref, Index Copernicus, OCLC, BASE, and University Libraries around the world.&nbsp;&nbsp;</p> <p style="text-align: justify;"><strong>ACCREDITED by Ministry of Research, Technology, and Higher Education of the Republic of Indonesia, <a title="Accreditation Certificate" href="" target="_blank" rel="noopener">No.30/E/KPT/2018</a>,&nbsp;October 24, 2018</strong></p> UIR PRESS en-US Journal of Geoscience, Engineering, Environment, and Technology 2503-216X <p>Copyright @2019. This is an open-access article distributed under the terms of the Creative Commons&nbsp;Attribution-ShareAlike 4.0 International License which permits unrestricted use, distribution, and reproduction in any medium.&nbsp;Copyrights of all materials published in JGEET are freely available without charge to users or / institution. Users are allowed to read, download, copy, distribute, search, or link to&nbsp;full-text&nbsp;articles in this journal without asking&nbsp;by giving&nbsp;appropriate credit, provide a link to the license, and&nbsp;indicate if changes were made. All of the&nbsp;remix, transform, or build upon the material must distribute the contributions under the&nbsp;same license&nbsp;as the original.&nbsp;</p> Front matter JGEET Vol 06 No 02 2021 <p>-</p> JGEET (J. Geoscience Eng. Environ. Technol.) Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-07-07 2021-07-07 6 2 Resistivity Data Modeling for Subsurface Volcanostratigraphy Construction of Cibadak Sub-Watershed, Bogor, West Java, Indonesia. <p>In Mt. Salak, there are six volcanic facies divided by eruption time seen from geomorphology data analysis and to identified the subsurface layer DC Resistivity method is applied. Beside resistivity, geostatistical parameters also influence the result model interpretation, so for obtain best model correlation parameters such as tilting, surfacing, variogram, grid method, and logarithmic distribution is applied. Using 18 points of acquisition data subsurface model is produce and then section model made to describe vertical resistivity distribution then correlated with facies lithology model. Based on that, produce three facies resistivity type namely: 0 – 100 Ohm.m (Low Resistivity Value) Interpreted as pyroclastic material composed as tuff and breccia that lies under lava. 100 – 300 Ohm.m (Medium Resistivity Value) Interpreted as breccia lithology type. Harder that pyroclastic material due to by this product is avalanches of lava. And &gt;300 Ohm.m (High Resistivity Value) Interpreted as lava lithology that lies at high elevation and the hardest lithology in this area. From the model, pyroclastic layer that is modeled found at low elevation and based on the direction it described as oldest facies layer, but at the bottom of this layer lies high resistivity value that unknown product. It can be Mt. Pangrango product due to at low elevation predicted as combine area product from product of Mt. Salak and Pangrango. High resistivity value show lava lithology and lava facies located in high elevation and medium resistivity describe breccia lithology as avalanche product of lava (youngest pyroclastic facies) and found at 500 – 100 meters msl.</p> Muhammad Kurniawan Alfadli Undang Mardiana Nanda Natasia Febriwan Mohammad Deden Zaenudin Mutaqin Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-06-03 2021-06-03 6 2 74 80 10.25299/jgeet.2021.6.2.2274 Feasibility Study on the Application of Dynamic Elastic Rock Properties from Well Log for Shale Hydrocarbon Development of Brownshale Formation in the Bengkalis Trough, Central Sumatra Basin, Indonesia. <p>In modeling the hydraulic fracking program for unconventional reservoir shales, information about elasticity rock properties is needed, namely Young's Modulus and Poisson's ratio as the basis for determining the formation depth interval with high brittleness. The elastic rock properties (Young's Modulus and Poisson's ratio) are a geomechanical parameters used to identify rock brittleness using core data (static data) and well log data (dynamic data). A common problem is that the core data is not available as the most reliable data, so well log data is used. The principle of measuring elastic rock properties in the rock mechanics lab is very different from measurements with well logs, where measurements in the lab are in high stresses / strains, low strain rates, and usually drained, while measurements in well logging use the principle of measured downhole by high frequency sonic. vibrations in conditions of very low stresses / strains, High strain rate, and Always undrained. For this reason, it is necessary to convert dynamic to static elastic rock properties (Poisson's ratio and Young's modulus) using empirical equations. The conversion of elastic rock properties (well logs) from dynamic to static using the empirical calculation method shows a significant shift in the value of Young's Modulus and Poisson's ratio, namely a shift from the ductile zone dominance to the dominant brittle zone. The conversion results were validated with the rock mechanical test results from the analog outcrop cores (static) showing that the results were sufficiently correlated based on the distribution range.</p> Ahmad Muraji Suranto Aris Buntoro Carolus Prasetyadi Ricky Adi Wibowo Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-06-08 2021-06-08 6 2 81 85 10.25299/jgeet.2021.6.2.5944 Calcareous Nanofossil of Post-Gondwana Sequence in Southern Banda Arc, Indonesia <p>The presence of calcareous nannofossils in samples of the Post-Gondwana sequences (Kolbano and Viqueque sequence) gives guidance about the relative age of the study area located in the Outer Banda Arc, namely Timor, Rote, and Sawu Island. The study was carried out on six traverses, Timor Island traverse (Baun and Camplong), Rote Island traverse (Termanu and Central Rote), and Sawu Island traverses (West Sawu and East Sawu). There is 29 outcrop sample prepared using the smear slide method and observed using a polarizing microscope with 1000x magnification. The results of the study showed the presence of Cretaceous, Paleogene, and Neogen-Quarternary calcareous nannofossil. There are 82 species from 14 families identified in the post-Gondwana sequence. The results showed that the assemblage of calcareous nannofossil in Cretaceous characterized by the presence of <em>Watznaueria fasciata</em>, <em>Watznaueria cynthae</em>, <em>Cyclagelosphaera brezae</em>, <em>Orastrum campanensis</em>, and <em>Micula concava</em>. The assemblage of Paleogene calcareous nannofossil characterized by the presence of <em>Coccolithus staurion</em>, <em>Chiasmolithus solitus</em>, <em>Discoaster minimus</em>, <em>Tawelus</em> (?) <em>magnicrassus</em>, <em>Chiasmolithus bidens</em>, <em>Prinsius africanus</em>, <em>Cyclicargolithus luminus</em>, <em>Spenolithus elongatus</em>, <em>Reticulofenestra umbilica</em>, <em>Cruciplacolithus vanheckae</em>, and <em>Helicospharea seminulum</em>, and the assemblage of Neogene calcareous nannofossil characterized by the presence of <em>Reticulofenestra pseudoumbilica</em>, <em>Discoaster quinqueramus</em>, <em>Helicosphaera princei</em>, and <em>Discoaster pansus</em>. Quarternary calcareous nannofossil characterized by the presence of <em>Ponthospaera indooceanica</em>.</p> Angga Jati Widiatama Lauti Dwita Santy Rikza Nur Faqih An Nahar Zulfiah Winda Eka Mandiri Puteri Adrianus Damanik Rubiyanto Kapid Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-06-08 2021-06-08 6 2 86 93 10.25299/jgeet.2021.6.2.6287 Characteristics of Chromite Deposits at North Kabaena District, Bombana Regency, Southeast Sulawesi Province, Indonesia <p>The study area is located in North Kabaena District, Bombana Regency, Southeast Sulawesi. This paper is aimed to describe characacristics of chromite deposits.&nbsp; This study is conducted in three stages, three stages including desk study, field work and laboratory analysis. Desk study mainly covers literature reviews. Field work includes mapping of surface geology and sampling of representative rocks types. Laboratory analysis includes the petrologic observation of handspecimen samples, petrographic analysis of the thin section and ore microscopy for polished section. The results of petrographic analysis show that olivine minerals are generally replaced by minerals orthopyroxene and has been alterated by lizardite type serpentine veins with a fractured structure. The mineral olivine is also replaced by the mineral chrysotile as a secondary mineral with a fibrous structure. Based on ore microscopy analysis show that chromite has generally experienced a lateritification process and has been replaced by magnetite, hematite and geotite minerals. Chromite has experience process of weathering and alteration from its source rock caused by tectonics that occurred in the study area. The results shows that the characteristics of chromite deposits in North Kabaena District Chromite deposits has generally encountered in peridotite rock which have a grain size of 0.3-20 cm. Furthermore, chromite deposits in the study area are also encountered in podiform deposits, distributed locally and shows podiform to tubular shape with the dimensions of 30-60cm.</p> Hasria Masri Suryawan Asfar Arisona Ali Okto La Ode Restele La Ode Ngkoimani Rika Yustika Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-06-08 2021-06-08 6 2 94 98 10.25299/jgeet.2021.6.2.6424 Mapping of Sediment on the Waters Around Panjang Island, Banten Bay, Indonesia <p>This study was conducted to map the surface sediment conditions in the waters around Panjang Island, Banten Bay. The survey method was conducted in February 2015 by taking sediment samples using a grab sampler at 15 stations. Sediment analysis was conducted to determine the grain size using the granulometry method which was then processed using the KUMMOD-SEL software to obtain the composition and texture of the sediment. The results of processing sediment samples at each station obtained that the grain size of sediments in the waters around Panjang Island ranged from -0.7 to 2.6 in the phi (φ) scale. Sediment composition consists of sand and gravel, with sand dominance of 89.1 %. Sediment textural classification consists of only 4 categories i.e. very coarse sand, coarse sand, medium sand, and fine sand. In general, the pattern of sediment distribution follows the pattern of water depth, where fine sand occupies deeper areas. Meanwhile, medium sand dominates surface sediment distribution in the study area.</p> Syawaludin A Harahap Lintang P. S. Yuliadi Noir P. Purba Awal A. Aulia Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-06-08 2021-06-08 6 2 99 106 10.25299/jgeet.2021.6.2.5057 The Geomorphological Factors and Its Implications for The Tidal Energy Installations in Java, Indonesia <p>This study aims to place the tidal energy installation effectively in Indonesia based on geomorphological factors. The survey method was used to analyze the characteristics of beaches in Indonesia. Mathematical physics model was implemented to find the new formulas based on geomorphological factors. Tides are the result of gravitational attraction and the centrifugal effect, which is the drive In the earth-moon system, tidal generating forces are the resultant forces that cause tides, namely: the earth-moon system (FS) centrifugal force and the moon's gravitational force (FB). FS works in the center of the mass of the earth-moon system whose mass point is located on the 3/4 radius of the earth. &nbsp;The style of tidal generator caused by the moon can be calculated by combining Newton's universal gravitational law .The results of this study consist of&nbsp; <em>F = m a<sub>c</sub></em>, where the style of the tidal generator caused by the moon can be calculated by combining newton's universal gravitational law in equation and newton's second law of motion in Equation. The another results is <em>tan = </em> &nbsp;, where the formula takes into account constants (K) based on slopes. The last result is the constants (K) for each land form starting on 0,00 untill 1,00.&nbsp; The north coast of Java is more suitable for tidal energy installations because the land form is dominated by alluvium plains of the quaternary age with a lower risk than the southern region of Java. The effectiveness of tidal energy installation depends on the characteristics of the land form. In alluvial plains, the quaternary age of the alluvial plains is more suitable than the hill form volcanic quaternary, tertiary volcanic, and tertiary holokarst.</p> Fahmi Arif Kurnianto Fahrudi Ahwan Ikhsan Bejo Apriyanto Elan Artono Nurdin Tyas Nisa Fadilah Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-06-15 2021-06-15 6 2 107 112 10.25299/jgeet.2021.6.2.5680 3D Natural State Modeling of Mount Iyang-Argopuro Geothermal Area, East Java, Indonesia <p>Mount Iyang-Argopuro is one of the geothermal working areas in the East Java. Mount Iyang-Argopuro has the potential of 185 MWe of reserves and 110 MWe of resources.&nbsp; It is estimated to have a liquid dominated reservoir with temperature up to 250-275 <sup>o</sup>C. An early 3D natural state numerical model of Mount Iyang-Argopuro Field is created using TOUGH2 simulator in order to identify the undisturbed condition of reservoir and resource assessment. Since Mount Iyang-Argopuro geothermal area is still in the exploration stage, the model created based on based on geological, geophysical, and geochemical data. The model has an area 14 km x 8.2 km and 9180 m in thickness. The model consists of 7410 of rectangular cell blocks with the roughest cell size is 1000 m x 1000 m and the finest is 200 m x 500 m. The model is verified by matching the model temperature and pressure profiles to the calculated geothermometer temperature and pressure, which shows good match enough.</p> Dewi Asmorowati Allen Haryanto Lukmana Rizqi Mahfudz Prasetyo Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-06-15 2021-06-15 6 2 113 119 10.25299/jgeet.2021.6.2.4127 Shallow Aquifer Groundwater Facies At Multiple Landuse Sites In Manglayang Volcanic Area, Jatinangor And Surroundings, Indonesia <p>Manglayang Mountain is generally composed by old and young volcanic materials. Older rocks are located around the northern part of mountain peak, in medial and distal parts. In the southern and southeastern parts composed by relatively young volcanic rocks starting from the proximal, medial to distal. These geologic conditions produce diverse aquifer systems. These differences in land use environments contribute to water quality conditions in local shallow aquifers. The research is therefore carried out in order to the effect of difference in land use environments on groundwater facies by dividing the area based on each land use. Land use in the research area is dominated by allotment of agricultural land, settlement, and industry. The study was conducted from the medial area to distal to the southern part of Manglayang Mountain, administratively including Sukasari, Jatinangor, and Rancaekek districts. To observe the groundwater conditions in the aquifer from the study area, physical and chemical parameters were tested. Chemical parameter test results were plotted using piper diagrams and Durov diagrams as a method that can illustrate the condition of groundwater facies. Physical characteristics of groundwater may reflect groundwater interactions with rocks. Measurable TDS concentrations of 48 - 299 mg / L and measured EC 100 - 1020 μmhos / cm, show different interaction conditions between groundwater with rocks or have received different material subsidies. Similarly, the occurrence of temperatures that vary considerably between air and water indicates the distance of groundwater sources with various water bodies. The groundwater facies that developed in the research area are generally dominated by Ca, HCO<sub>3</sub> in the agricultural land use area, Mg, HCO<sub>3</sub> in the settlement area, and in some Cl-facing evolving places in the industrial land use zones. In addition, there are also indications of mixing of anions and cations in groundwater samples in all three land use areas. This indicates that there has been a change in groundwater characteristics in some areas of land use utilization in the research area</p> Bombom Rachmat Suganda Wahyudi Yusuf Mochamad Nursiyam Barkah Cecep Yandri Sunarie M. Sapari Dwi Hadian Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-07-07 2021-07-07 6 2 120 126 10.25299/jgeet.2021.6.2.3315 Back matter JGEET Vol 06 No 02 2021 <p>-</p> JGEET (J. Geoscience Eng. Environ. Technol.) Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology 2021-07-07 2021-07-07 6 2