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Morfotektonik pada Gunung Parang Melalui Pendekatan Geomorfologi Tektonik Digital, Daerah Karangsambung Ghufrani, Poppy; Soesilo, Joko
OPHIOLITE: Jurnal Geologi Terapan Vol 6 No 1 (2024): APRIL 2024
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v6i1.p19-28

Mount Parang is a sill intrusion formed as partial melting due to tectonic activity namely subduction in Miocene which then broke through the Karangsambung formation and revealed to the surface as Mount Parang. Apart from the Mount Parang intrusion, the result of tectonic activity at that time is hills morphology with landforms in the form of anticline and syncline fold structures that stretch from east to west of the Karangsambung area. The geomorphological approach aims to determine the level of tectonic activity based on morphotectonic analysis around the Mount Parang intrusion. Morphotectonic analysis is conducted through a quantitative approach, by measuring and calculating geomorphic index variables using mathematical formulas. The index variables analysed include hypsometric integral (Hi), basin watershed asymmetry (AF), stream gradient-length index (SL), ratio of valley floor width to valley height (Vf), and mountain front sinuosity (Smf). Based on calculation Hi has a value of 1.0 with SL covering three classes. The AF index has a value of >50 with Vf values is between 0.26 and 0.87 and Smf values between 1.3 and 2.7. Based on these values, it indicates that the area around the Mount Parang intrusion has high tectonic activity.

Barriers to Indonesia's Energy Transition Loy, Nikolaus; Rachmawati, Iva -; Issundari, Sri; Soesilo, Joko
The Indonesian Journal of Planning and Development Vol 9, No 2 (2024): October 2024
Publisher : Department of Urban and Regional Planning, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijpd.9.2.1-13

Considering the energy situation, which can no longer depend entirely on fossil energy, the energy transition is the responsibility of all countries. Indonesia has set a target for renewable technology in 2025 of 23%. However, the share of renewable energy in Indonesia's primary electricity generation will decrease to 10.4% in 2022. This figure further distances the renewable energy mix target and raises doubts among policymakers and energy academics. This article aims to determine the factors that influence the slow energy transition in Indonesia from fossil energy to renewable energy. This article is qualitative research using in-depth interview methods and documentary studies. In-depth interviews were conducted with several technocrats and bureaucrats to find out their views regarding the condition of alternative energy and Indonesia's unpreparedness to the energy transition. Qualitative research shows that the lack of energy justice in policies related to the energy transition causes the slow energy transition. First, complicated bureaucracy and overlapping or contradictory regulations cause procedural justice issues. Second, the unfulfilled distributive justice has led to losses due to policies related to renewable energy for several parties. Third, the country's failure to prioritize the environment caused the unfulfilled restorative justice. Fourth, top-down policymaking led to the field of recognition justice. Fifth, cosmopolitanism justice has yet to be fulfilled because Indonesia has not been able to become a global actor in the issue of renewable energy.

Stereographic for Development of Stricture Pattern of Geological Alteration Zone in Atauro Island, Timor-Leste Gomes, Nazario; Sutarto, Sutarto; Soesilo, Joko; Purwanto, Heru Sigit; Christophe, James
Asian Journal of Social and Humanities Vol. 2 No. 6 (2024): Asian Journal of Social and Humanities
Publisher : Pelopor Publikasi Akademika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59888/ajosh.v2i6.274

The geological structural patterns and hydrothermal alteration zones of Atauro Island, Timor-Leste, which are influenced by the collision mechanism between the Banda Arc and the Australian Continent, are the subject of this study. The study identifies fault types and alteration zones through stereographic analysis. It indicates the possibility of mineralization in the area. Four alteration zones were identified in this study: argillic, Propylitic, calcosite, and geotite. The analysis results show that left-striking and normal faulting were essential in forming these zones. The mineralization zones, mainly chalcopyrite and chalcocite, are related to the north-northeast trending left horizontal Fault. In addition, this study suggests additional research that includes mineralogy, geochemical, and geophysical analyses to understand more about the characteristics of hydrothermal alteration zones and possible mineralization on Atauro Island. The results of this study are expected to improve our understanding of mineral resources in the region, and it is suggested that this information be considered by authorities responsible for the management of potential natural resources on Atauro Island, Timor.

Studi Petrografi dan Alterasi Batuan Andesit, Dasit Sebagai Wall-Rock pada Daerah Makili Desa Makili, Kabupaten Atauro, Timor-Leste Gomes, Nazario; Christopher, James; Purwanto, Heru Sigit; Sutanto, Sutanto; Sutarto, Sutarto; Soesilo, Joko
Jurnal Pendidikan Tambusai Vol. 8 No. 1 (2024): April 2024
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v8i1.13591

Penelitian ini bertujuan untuk memahami karakteristik petrografi dan alterasi batuan andesit dan dasit sebagai batuan samping (wall-rock) di daerah Makili, Kabupaten Atauro, Timor-Leste. Metode penelitian yang digunakan mencakup pemetaan geologi permukaan, pengambilan sampel batuan samping yang telah mengalami alterasi, serta analisis laboratorium menggunakan mikroskop polarisasi untuk pengamatan petrografi detail. Hasil penelitian mengungkapkan bahwa Pulau Atauro termasuk dalam Old Volcanic Product dengan litologi berupa lava andesit, breksi, dan tuf pasiran berbatuapung. Umur Old Volcanic Product diperkirakan sekitar 2,99±0,90 juta tahun lalu atau Pliosen-Plistosen. Analisis mineral mengidentifikasi keberadaan mineral utama seperti Quartz (Qz), Plagioklase (Plg), Mineral opak (Oq), Massa gelas (Mg), Mineral Oksida (Ox), Clay mineral (C), Piroksen (PX), K-Feldspar (K-F), Alunite (Al), Pirofilit (Pyr), Diaspor (Dp), dan Serisit (Ser). Selain itu, penelitian ini mengamati kelurusan yang mencerminkan tren struktur dan kedudukan batuan di daerah Atauro, dengan arah kelurusan UBL-STG, BL-TG, BBL-TTG, dan TL-BD. Mineral alterasi yang ditemukan menunjukkan bahwa daerah penelitian termasuk dalam zona alterasi utama, yaitu zona filik dan zona argilik. Studi ini memberikan pemahaman yang lebih mendalam tentang karakteristik petrografi, alterasi, dan struktur batuan samping di daerah Makili, Kabupaten Atauro, Timor-Leste, yang dapat memberikan wawasan tentang geologi regional dan potensi mineralisasi di wilayah tersebut.

Geologi dan Karakteristik Laterit Nikel Berdasarkan Mineralogi Batuan Dasar dan Geokimia Daerah Routa dan Sekitarnya, Kecamatan Routa, Kabupaten Konawe, Provinsi Sulawesi Tenggara Handika, Erdin Tri; Sutarto, Sutarto; Soesilo, Joko
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.14138

The main nickel production in Indonesia mostly comes from laterite deposits that are widely found in eastern Indonesia. The research was conducted in the Konawe area, Southeast Sulawesi which is geologically composed of ultramafic rocks in the form of peridotite (harzburgite, lherzolite, wehrlite), dunite, websterite, and others. These ultramafic rocks are bedrock that has the potential to form nickel laterite deposits. To find out the characteristics of nickel laterite deposits, surface mapping, subsurface mapping or sub-surface mapping were carried out by drilling to determine the subsurface conditions, and statistical data processing in the form of geochemical data of the elements MgO, SiO2, Al2O3, Fe, Ni, MnO, Co, and Cr2O3. From the data, it is known that the research area is dominated by the Routa Peridotite Unit which has olivine and ortho-pyroxene mineral content based on petrographic analysis so that the enrichment of Ni content produced in the laterite zone is high. The research area has a thick and complete laterite zone where there is a cover soil zone consisting of Top Soil (SO), and Ferricrete (FE), a limonite zone consisting of Ferrigenous Zone (FZ), Transported limonite (TL), Limonite (LM), a saprolite zone consisting of Ferrigenous Saprlote (FS), Saprolite (SP), Rocky Saprolite (RS), Saprolite Rock (SR), bedrock zone. Based on drilling data, there is a thick limonite zone with mineral content in the form of hematite, goethite, manganese, maghemite, and several silica veins or silica boxwork are found which are characteristics of nickel oxide or oxide deposits and in the saprolite zone, garnierite minerals and serpentine minerals are found which are characteristics of hydrous Mg-Silicate nickel laterite deposits. Based on the correlation of drilling data, there is a thick laterite zone formed in flat to sloping morphology, while a thin laterite zone is formed in sloping to steep areas.

Stereographic for Development of Stricture Pattern of Geological Alteration Zone in Atauro Island, Timor-Leste Gomes, Nazario; Sutarto, Sutarto; Soesilo, Joko; Purwanto, Heru Sigit; Christophe, James
Asian Journal of Social and Humanities Vol. 2 No. 6 (2024): Asian Journal of Social and Humanities
Publisher : Pelopor Publikasi Akademika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59888/ajosh.v2i6.274

The geological structural patterns and hydrothermal alteration zones of Atauro Island, Timor-Leste, which are influenced by the collision mechanism between the Banda Arc and the Australian Continent, are the subject of this study. The study identifies fault types and alteration zones through stereographic analysis. It indicates the possibility of mineralization in the area. Four alteration zones were identified in this study: argillic, Propylitic, calcosite, and geotite. The analysis results show that left-striking and normal faulting were essential in forming these zones. The mineralization zones, mainly chalcopyrite and chalcocite, are related to the north-northeast trending left horizontal Fault. In addition, this study suggests additional research that includes mineralogy, geochemical, and geophysical analyses to understand more about the characteristics of hydrothermal alteration zones and possible mineralization on Atauro Island. The results of this study are expected to improve our understanding of mineral resources in the region, and it is suggested that this information be considered by authorities responsible for the management of potential natural resources on Atauro Island, Timor.

Subsurface S-type Granitoid Identification Based on Gravity and Seismic Tomography Models in Pacitan, East Java Soesilo, Joko; Palupi, Indriati Retno; Raharjo, Wiji; Sutanto Sutanto; Sulistyohariyanto, Faris Ahad; Ekaristi, Kevin Gardo Bangkit; Stiawan, Fandi Budi
EKSPLORIUM Vol. 39 No. 2 (2018): NOVEMBER 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.2.4954

Granitoid outcrop has been observed in Montongan, Tulakan Subdistrict, Pacitan District, East Java. Geochemically, granitoid shows peralluminous S-type granitoid which consists of comparable plagioclase and potassium feldspar leading to adamelite and granodiorite variety with andalusite, fine size corundum and cordierite inside. These modal minerals are consistent with its bulk chemical analysis result that shows alumina rich rock. Highly weathered spotted pinkish soil with remaining quartz gravels characterizes its surface. Lateritic pink soil up to more than 25 meters thick covers the granitoid body and this feature is indicative to locate its surface distribution, while its subsurface distribution is remain uncertain. The research aimed to identify granitoid subsurface distribution. To identify the subsurface body, gravity and seismic tomography models were used. According gravity model, the pluton body is 5 km wide which is rootless downward and seems extends eastward. Meanwhile, the north-south seismic tomographic model across Pacitan Region indicates dense solid body override the recent Java subduction zone. The body is assumed to have correlation with surface granitic rock. It supports an idea that there is a micro continent trapped beneath Southern Mountain of East Java.

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