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PENENTUAN STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN APLIKASI GAYABERAT PADA DAERAH PANAS BUMI SOLOK Mayasari, Verna; Syafri, Ildrem; Haryanto, Agus Didit; Sugianto, Asep
Bulletin of Scientific Contribution Vol 16, No 1 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

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Metode gayaberat dapat menggambarkan kondisi struktur bawah permukaan berdasarkanvariasi medan gravitasi bumi yang disebabkan oleh perbedaan densitas antar batuan di bawahpermukaan pada daerah panas bumi Solok. Hasil metode gayaberat berupa peta anomalibouguer, peta anomali bouguer regional, peta anomali bouguer residual beserta penampangyang akan memberikan gambaran keadaan batuan bawah permukaan. Hasil pemodelangayaberat menunjukkan liniasi kontur yang mengindikasikan struktur geologi berupa sesardengan arah baratdaya-timurlaut dengan nilai densitas batuan2.85 gr/cc yang berada padalapisan batuan vulkanik tersier. Penelitian ini diharapkan dapat memberikan pemahamanterhadap karakteristik anomali gayaberat dan membantu tahapan eksplorasi lebih lanjut. Kata kunci : anomali, bouguer, densitas, gayaberat, regional, struktur bawah permukaan,panas bumi.

KARAKTERISTIK GEOKIMIA LEMPUNG DAN KUALITASNYA SEBAGAI PENJERNIH MINYAK SAWIT DI KABUPATEN SUKABUMI, JAWA BARAT Insan, Rachmatulloh; Hutabarat, Johanes; Haryanto, Agus Didit
Jurnal Teknologi Mineral dan Batubara Vol 20 No 3 (2024): Jurnal Teknologi Mineral dan Batubara Edisi September 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No3.2024.1597

Before palm oil can be consumed, it must be processed through several processes, one of them is purification. To obtain an oil colour corresponds to a certain quality, a bleaching process is required using a bleaching agent or bleaching earth (BE). Material of palm oil purifier is made from clay. Clay is often found in Sukabumi Regency, West Java Province in Jampang Formation Cikarang Member and Lengkong Formation. The purpose of this research is to obtain a geochemical description and to determine the chemical composition of clay minerals in Jampang Formation Cikarang Member and Lengkong Formation and its effect on surface area properties and bleaching performance. This research used five clay samples, three samples from Jampang Formation Cikarang Member and two sampels from Lengkong Formation. To obtain geochemical characteristics composition, each sample was analyzed using XRD, SEM and XRF methods, meanwhile, to obtain information on the quality of palm oil clarifier, surface spesific area of the clay was measured using SAA and the color index of the palm oil that had been filtered by each clay sample was measured using the Lovibond Tintometer. The results showed that there was correlation between montmorillonite content to surface area value and bleaching performance of the clay. The larger the surface area of the clay, the higher its bleaching ability for palm oil. In addition, the surface area of the clay is also related to its montmorillonite content. Clay samples with high surface area, namely sample FJ-1 with a surface area of 111.5 m²/g and FJ-2 with a surface area of 106.4 m²/g, have higher montmorillonite content, specifically 67.2 and 70.7% compared to samples FJ-3, FL-1, and FL-2, which have montmorillonite contents of 17.4%, 47.4%, and 32.9%. Therefore, to obtain high-quality clay as a bleaching earth (BE) for the palm oil industry, clay with a high montmorillonite mineral content should be used.

KARAKTERISTIK GEOKIMIA LEMPUNG DAN KUALITASNYA SEBAGAI PENJERNIH MINYAK SAWIT DI KABUPATEN SUKABUMI, JAWA BARAT Insan, Rachmatulloh; Hutabarat, Johanes; Haryanto, Agus Didit
Jurnal Teknologi Mineral dan Batubara Vol 20 No 3 (2024): Jurnal Teknologi Mineral dan Batubara Edisi September 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No3.2024.1597

Before palm oil can be consumed, it must be processed through several processes, one of them is purification. To obtain an oil colour corresponds to a certain quality, a bleaching process is required using a bleaching agent or bleaching earth (BE). Material of palm oil purifier is made from clay. Clay is often found in Sukabumi Regency, West Java Province in Jampang Formation Cikarang Member and Lengkong Formation. The purpose of this research is to obtain a geochemical description and to determine the chemical composition of clay minerals in Jampang Formation Cikarang Member and Lengkong Formation and its effect on surface area properties and bleaching performance. This research used five clay samples, three samples from Jampang Formation Cikarang Member and two sampels from Lengkong Formation. To obtain geochemical characteristics composition, each sample was analyzed using XRD, SEM and XRF methods, meanwhile, to obtain information on the quality of palm oil clarifier, surface spesific area of the clay was measured using SAA and the color index of the palm oil that had been filtered by each clay sample was measured using the Lovibond Tintometer. The results showed that there was correlation between montmorillonite content to surface area value and bleaching performance of the clay. The larger the surface area of the clay, the higher its bleaching ability for palm oil. In addition, the surface area of the clay is also related to its montmorillonite content. Clay samples with high surface area, namely sample FJ-1 with a surface area of 111.5 m²/g and FJ-2 with a surface area of 106.4 m²/g, have higher montmorillonite content, specifically 67.2 and 70.7% compared to samples FJ-3, FL-1, and FL-2, which have montmorillonite contents of 17.4%, 47.4%, and 32.9%. Therefore, to obtain high-quality clay as a bleaching earth (BE) for the palm oil industry, clay with a high montmorillonite mineral content should be used.

Fluid Inclusion and Mineralization of Base Metals in Cretaceous Metamorphic Rocks, in Jiwo Hills, Bayat, Klaten, Central Java Maulana, Fivry Wellda; Rosana, Mega Fatimah; Yuningsih, Euis Tintin; Haryanto, Agus Didit; Purwanto, Heru Sigit; Rakhman, Arie Noor
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.251-267

The lack of mineralization research on metamorphic rocks in Java, especially in the Jiwo area, is part of the research interest. The host rock of ore mineralization in the Jiwo area is Cretaceous metamorphic rock located in the hilly area of Jiwo, Klaten, Central Java. The presence of chlorite, actinolite, quartz, epidote, and garnet minerals indicates the metamorphic facies of greenschist. Meanwhile, the presence of glaucophane, quartz, and epidot minerals is a metamorphic facies of blueschist. The metamorphic rock research method was carried out in several stages: 1. Observation; 2. Field data collection, including mapping of metamorphic rock distribution, general geological conditions and rock sampling; and 3. Laboratory analysis. Laboratory analysis testing consists of petrography, ore microscopy, geochemistry (AAS), and fluid inclusion. Alterations that develop in the researched area are in the form of propylitic (chlorite, calcite, epidote), argillic, and silicification (quartz, graphite, calcite, carbonate minerals). Ore microscopy analysis has identified the presence of mineral sulfide such as pyrite, chalcopyrite, bornite, galena, and covellite. In addition, galena was found covered with chalcopyrite. Based on AAS analysis on mineralized metamorphic rocks, Au levels are 0.001 - 0.008 g/t, Ag 0.1 - 2.4 g/t, Cu 4 - 75 g/t, Zn 14 - 166 g/t, and Pb 11 - 60 g/t. The inclusion of fluid from the discordant vein was obtained with a homogenization temperature (Th) of 312 - 435 0C, with a salinity of 1.95 - 5.05 wt. % eq. with isothermal mixing and heating depressurization conditions. The isothermal mixing process is a mixture of meteoric fluids and metamorphic fluids. Meanwhile, heating depressurization occurs during subduction, so that the temperature is relatively high. The homogenization temperature (Th) of the concordant vein ranges from 168.5 - 296.55 °C, with a salinity of 1.95 -12.6 wt% NaCl eq. A salinity of 12 wt% NaCl is formed due to liquids that are aquos trapped at high pressure and temperature conditions and the devolatilization process that occurs during subduction. Based on the plotting of the homogenization temperature range and the salinity of fluid inclusion, which is 168.5 - 4350C and 1.95 - 12.6 wt% NaCl eq, the type of deposits in the study area is in the range of Au lode or orogenic deposits. The existence of two homogenization clusters in the Jiwo Hill is estimated to be part of the process of forming the blueschist facies with greenschist which is shown in the retrograde actinolite in the glaucophane epidote schist rock which is part of the blueschist facies.

Pemanfaatan Langsung Air Panas Bumi Gunung Ungaran untuk Terapi Kesehatan Masyarakat: Pendekatan Geokimia dan Nilai Geoheritage: Direct Use of Geothermal Hot Springs from Mount Ungaran for Community Health Therapy: Geochemical Analysis and Geoheritage Value kurnianto, brany; Sukiyah, Emi; Haryanto, Agus Didit; Muljana, Budi
Retii 2025: Prosiding Seminar Nasional ReTII ke-20 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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ABSTRAK Kawasan panas bumi Gunung Ungaran, Jawa Tengah, menampilkan berbagai manifestasi hidrotermal seperti mata air panas Gedongsongo, Nglimut, dan Diwak yang memiliki potensi tinggi untuk pemanfaatan langsung (direct use). Penelitian ini mengkaji karakteristik geokimia air panas bumi serta potensinya sebagai media terapi kesehatan masyarakat berbasis geoheritage. Analisis lapangan dan laboratorium menunjukkan bahwa air panas Ungaran tergolong tipe Na–HCO₃ dengan kandungan dominan SiO₂, Ca²⁺, Mg²⁺, dan HCO₃⁻, pH netral hingga sedikit basa, serta suhu berkisar 38–45°C. Komposisi tersebut berperan penting dalam proses regenerasi kulit, relaksasi otot, dan peningkatan sirkulasi darah, sehingga mendukung fungsi terapeutik alami. Selain temuan ilmiah, penelitian ini juga menyoroti keberadaan situs Candi Derekan sebagai bukti arkeogeologis pemanfaatan air panas sejak masa kerajaan kuno, yang memperkuat nilai geoheritage dan geo-culture kawasan Gunung Ungaran. Dengan demikian, sistem panas bumi Ungaran tidak hanya signifikan sebagai sumber energi, tetapi juga sebagai aset geoheritage berorientasi kesehatan masyarakat, yang merepresentasikan integrasi antara geosains, budaya, dan kesejahteraan komunitas lokal. Pemanfaatan berbasis masyarakat ini berpotensi dikembangkan menjadi geowisata kesehatan berkelanjutan, sekaligus memperkuat upaya konservasi sumber daya panas bumi sebagai bagian dari warisan geologi nasional.

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