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LINGKUNGAN PEMBENTUKAN DAN DIAGENESIS BATUGAMPING DAERAH KEMANG BARU DAN SEKITARNYA, KABUPATEN SIJUNJUNG Patonah, Aton; Isnaniawardhani, Vijaya
Bulletin of Scientific Contribution Vol 12, No 1 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1302.32 KB) | DOI: 10.24198/bsc.v12i1.8361

Abstract

Carbonate rock is one of reservoir rock types in petroleum. It is interesting to study because its special characteristic, that is, it can change so easily that will affect to quality and quantity of reservoir. This research has been done at Kemang Baru area and around, Sijunjung Distric. Purposes of this research are to know texture and composition characteristic and to know what kind of environment deposition and diagenesis process involved as long as the formation. To get the information about that, petrography and Palinology methods are used. The result of this research shows that only 37 samples of carbonate type from 69 samples which have been analized. These are wackestone and mudstone. They have been formed at low energy environment and in reduction process which is characterized by present of pyrite in the rocks. To support the data, result of Palinology analysis, the rock have contained Dicolpopollis sp., Margocolporites sp., Palmaepollenites sp. and Psilatricolpites sp, berasosiasi dengan Acrostichum sp., Detloidospora sp., Hyphae sp., Inaperturisporites sp., Laevigatosporites sp., Verrucatosporites sp. Based on these, the rocks were formed at deep Lake.
GEOTHERMAL POTENTIAL IDENTIFICATION BASED ON REMOTE SENSING ANALYSIS IN IJEN GEOTHERMAL FIELD, EAST JAVA Fauzi, Ridwan Nur; Patonah, Aton; Pratiwi, Santi Dwi; Hirose, Kazuyo; Rendra, Pradnya Paramarta Raditya
Bulletin of Scientific Contribution Vol 21, No 2 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i2.44688

Abstract

Geothermal is a renewable energy resource that is used for various needs, both as heat energy on a local scale to electricity production on an industrial scale. The search for geothermal resources is difficult and costly, thus a survey method is needed that can facilitate the geothermal exploration stage in a large area coverage.  Remote sensing methods can be an adequate tool to guide investigations of geothermal prospect areas through the elaboration of potential hydrothermal resource maps at the level of profitable potential zones for exploitation. The purpose of this study is to identify areas that support geothermal exploration and exploitation in the Ijen Mountains area, East Java. The method used includes processing OLI (Operational Land Imager) and TIRS (Thermal Infrared Sensor) sensor images from the Landsat-8 satellite to obtain the distribution of hydrothermal alteration zones and surface temperature anomalies. Identification of permeable zones based on fracture density in the study area was also carried out by analyzing Digital Elevation Model (DEM) data to obtain the topographical features of the study area. The results of the study show that there is a correlation between the parameters used in several areas which are then interpreted as geothermal prospect zones. The moderate to high prospect zone was found to be associated with most of the known presence of geothermal manifestations.
Petrogenesis of Andesite in Cisanggarung area, Cimenyan District, Bandung Regency, West Java Imaniar, Nurul; Patonah, Aton; Prambada, Oktory
Bulletin of Scientific Contribution Vol 19, No 3 (2021): Bulletins of Scientific Contribution : Geology
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v19i3.35798

Abstract

The Cisanggarung area is located in Cimenyan District, Bandung Regency, an area composed of volcanic products that many thick outcrops are found and used as andesite mines managed by local communities. This study examines the characteristics of andesite in the Cisanggarung area using petrology, petrography, XRF, and ICP-MS so that petrogenesis can be interpreted. Andesite rocks in the Cisanggarung area have a sheeting joint structure and microscopically have porphyritic, trachytic, glomeroporphyritic, zoning, embayment, and sieve textures. The composition of this rock was plagioclase, pyroxenes, opaque minerals with the less content of secondary minerals such as chlorite and clay minerals. The magmatic affinity of this rock shows calc-alkaline series, precisely in tholeiitic island arc tectonic setting associated with subduction, which is characterized by TiO2<1.3 wt.%. Magma presumably comes from a continent plate with a depth of 127.87-136.92 km. Magma in this area undergoes a middle-stage differentiation process, namely assimilation and fractionation crystallization. The magmatism process forms two stages of crystallization, starting from the slow cooling stage, followed by relatively fast magma to the surface.
SISTEM PANAS BUMI DAERAH KALAWAT, KABUPATEN MINAHASA UTARA, PROVINSI SULAWESI UTARA Yamin, Riza Asyari; Patonah, Aton; Hardiyono, Adi; Hadi, Muhammad Nur
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1099.101 KB) | DOI: 10.24198/bsc.v13i1.8385

Abstract

Kalwat Geothermal Field administratively is located in North Minahasa District, North Sulawesi Province. Litologies of this research area divided by pyroclastic flows and lava. The heat source of this location comes from Mahawu Mountain that located in the southwest outside the research area. Lithology which acts as the cap rock layer is form by pyroclastic flow that has clay minerals which impermeable. Based on petrographic and PIMA abalysis, the alteration minerals that arise are dominated bu montmorillonite and halloysite, so the alteration type of this research area is argilic type and located at the northwest and southwest of research area. The water type that appears are dilute chloride-bicarbonate type and bicarbonate type. Based on the calculation of paleotemperature and geothermometer, there is increase of temperature during the form of mineral and the recent temperature. This is due to increased of volcanic activity in the research area. This research area is water-dominated and moderate temperature system that has range of temperature at 209-2100 C.
PENGARUH KEMIRINGAN LERENG TERHADAP LAJU SEDIMENTASI PADA RENCANA BENDUNGAN PARIGI Yusuf, Muhammad Farhan; Siahaan, Yakub; Sukiyah, Emi; Mulyo, Agung; Patonah, Aton; Zakaria, Zufialdi
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (769.386 KB) | DOI: 10.24198/bsc.v16i2.17922

Abstract

Pembangunan Bendungan Parigi akan sangat bermanfaat untuk kepentingan masyarakat. Bendungan ini akan digunakan untuk keperluan pertanian (irigasi) dan persediaan air baku. Lokasi Rencana Bendungan Parigi terletak pada sub-DAS Parigi yang memiliki luas 57,98 km2. Dalam perencanaan bendungan aspek sedimentasi sangat penting. Aspek ini akan berkaitan dengan desain Bendungan. Pada DAS yang tidak terlalu luas, laju sedimentasi setara dengan laju erosi. Perhitungan laju sedimentasi dilakukan berdasarkan fungsi erosi dengan metode Universal Soil Loss Equation (USLE) dan SDR. Metode ini berhubungan dengan faktor – faktor yaitu erodibilitas tanah, curah hujan, tataguna lahan, dan topografi. Faktor kemiringan lereng erat kaitannya terhadap laju sedimentasi, penelitian ini akan membahas tentang peranan kemiringan lereng  terhadap laju sedimentasi. Nilai laju sedimentasi hasil perhitungan menggunakan metode USLE yaitu  sebesar 149,53 ton/ha/th.  Hasil perhitungan statistik dengan  metode regresi linier di dapat bahwa faktor kemiringan lereng berpengaruh signifikan terhadap laju sedimentasi dengan persamaan regresi Y’ = 15,32 + 7,313X. Nilai koefisien regresi (r) sebesar 0,697 menunjukkan bahwa ada hubungan yang kuat antara kemiringan lereng (X) dan laju sedimentasi (Y). Pengaruh yang diberikan oleh aspek kemiringan lereng terhadap laju sedimentasi adalah sebesar 48,6 %.
Pendugaan Temperatur Bawah Permukaan Berdasarkan Kehadiran Mineral Alterasi Pada Sumur Llk-1 Lapangan Panasbumi Lilli, Kabupaten Polewali Mandar, Provinsi Sulawesi Barat Adzka, Fazillah; Patonah, Aton; Robertus, Simarmata S. L.
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (779.234 KB) | DOI: 10.24198/bsc.v14i3.10967

Abstract

Lapangan Panasbumi Lilli secara adminstratif  termasuk ke dalam wilayah Kecamatan Matanga, Kabupaten Polewali Mandar, Provinsi Sulawesi Barat. Hasil penyelidikan terdahulu diketahui memiliki daerah prospek seluas 18 km2 yang masih membuka ke arah utara. Fokus penelitian ini adalah memperkirakan temperatur bawah permukaan dari sumur  LLK-1 untuk menentukan zona reservoir dan zona penudungnya. Metode yang digunakan adalah petrografi dan alat SpecTerra untuk mengetahui jenis mineral lempung. Berdasarkan deskripsi dan analisis komposisi mineral primer dan alterasi pada batuan dari sumur tersebut diketahui bahwa batuan pada sumur LLK-1 dari bawah ke permukaan adalah porfiri andesit terubah dan andesit terubah. Mineral alterasi yang hadir adalah saponite, monmorilonite, smectite, chlorite, mineral oksida dan pirit. Berdasarkan asosiasi mineral alterasi tersebut, zona alterasi terbagi ke dalam 2 zona, yaitu zona smectite dan zona smcetite-chlorite yang merupakan sebanding dengan tipe argilik dan subprofilitik, terbentuk pada temperatur 50oC – 230oC.  Hasil data tersebut, maka sumur LLK-1 masih  termasuk ke dalam zona penudung. Kata Kunci : Alterasi, Paleotemperatur, Panasbumi Lilli Lilli Geothermal Field administratively located in Matanga, Polewali Mandar Districts, West Sulawesi. Result from latest investigation shows that this area have a prospect about 18 km2 with distribution spreading probabilility to the North. Focus of this research is to estimate temperature below the surface from well LLK-1 (Lilli Geothermal field) to understand the reservoir and caps rock zone using petrography and SpecTerra measurement.  Based on description and primary mineral composition, also from mineral alteration, well LLK-1 has altered andecite porfiri to altered andecite. Alteration mineral that can be found are saponite, montmorilonite, smectite, chlorite, oxide mineral and pyrite. From the alteration mineral association, alteration zone can be divided into two zone, there are smectite and smectite-chlorite zone that comparable with argilic and subpropilitic type that can be formed at 50°C - 230°C. It is conclude that LLK-1 well still include in the caps rock zone so the reservoir zone cannot be determined.  Keywords: Alteration, Paleotemperature, Lilli Geothermal Field
KARAKTERISTIK BATUAN METAMORF BAYAH di DESA CIGABER, KABUPATEN LEBAK, PROVINSI BANTEN Patonah, Aton; Syafri, Ildrem
Bulletin of Scientific Contribution Vol 12, No 2 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (355.497 KB) | DOI: 10.24198/bsc.v12i2.8369

Abstract

Metamorphic rocks in Bayah Complex included by Bayah mountain zone. Purpose of this research is to know characteristic of this rock with using petrography methods, that is, identify texture, structure, mineral contain, and metamorphic facies of the rocks. The result showed that kind of the rock is dominated by biotite schist, some actinolite schist, hornblend schist and chlorite schist. Almost all them have retrograde metamorphism, is characterized by biotite altered to chlorite and muscovite, hornblende to actinolite, and actinolite to chlorite. This proses probably associated by uplift processes in Eocene – Oligocene.
ALTERASI MINERALISASI GRANODIORIT CIHARA DAN SEKITARNYA, KABUPATEN LEBAK, BANTEN Patonah, Aton; Permana, Haryadi; Rosyid, Vendi Hakim Ar; Ramadhan, Taufik
Bulletin of Scientific Contribution Vol 18, No 3 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v18i3.30930

Abstract

Penambangan emas di Cihara dan sekitarnya yang dilakukan oleh masyarakat setempat menarik untuk diteliti, karena keberadaan emas semakin berkurang, khususnya pada granodiorit, Ketika dilakukan penambangan semakin dalam.  Tujuan penelitian ini adalah untuk mengidentifikasi karakteristik alterasi dan mineralisasi serta tipe endapan dengan pendekatan observasi lapangan dan analisis laboratorium, yaitu petrografi, mineragrafi dan AAS.  Hasil menunjukkan bahwa alterasi di daerah penelitian dibagi menjadi 3 (tiga) zona; (1) zona serisit – klorit – epidot – kuarsa – karbonat (2) zona kuarsa – karbonat – klorit – serisit - biotit (3) zona klorit – karbonat – kuarsa – serisit. Lebih lanjut lagi, mineralisasi yang tersingkap di daerah ini didominasi oleh pirit, sfalerit, galena, sebagian kecil hadir mineral kalkopirit, kovelit dan emas. Logam dasar umumnya terdapat pada urat kuarsa bersama dengan emas; sementara pada granodiorit (disseminasi), jumlahnya berkurang. Hal ini ditunjukkan dengan data hasil assay bahwa kadar logam dasar dan emas relatif lebih tinggi pada urat kuarsa dibandingkan pada tekstur disseminasi. Berdasarkan data – data tersebut, jenis endapan di daerah tersebut memiliki kemiripan dengan endapan porfiri yang berasosiasi dengan karbonat – logam dasar.
SISTEM PANASBUMI BERDASARKAN ANALISIS GEOKIMIA AIR PANAS DAERAH AMOHOLA DAN SUMBERSARI, KECAMATAN MORAMO, KABUPATEN KONAWE SELATAN, PROVINSI SULAWESI TENGGARA Aprilia, Fitriani Dewi; Yuningsih, Euis Tintin; Patonah, Aton; Rezky, Yuano; Yushantarti, Anna; Nurdin, Asep
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (841.483 KB) | DOI: 10.24198/bsc.v13i1.8391

Abstract

The research area is located in Amohola and Sumbersari, Moramo sub-district, Konawe South regency, Southeast Sulawesi Province. Geographically located between 122°35’6,07" – 122°45'58,94" BT dan 4°5'20,28" – 4°16'10,85" LS. The research areas have a stratigraphy consisted of Meta-limestones, Phylite, Schist, Quartzite, Conglomerates, Limestones, Carbonate Sandstone, Claystone, and sediment surface. Hot waters have temperatures ranging from 37,5oC to 50oC. The fluid geochemical data affirm that the Amohola area has Chloride type of water, which indicates it is close to the heat source, whereas in Sumbersari area has Bicarbonate water type, which indicates that the fluid has affected by meteoric water. Geothermal system in these two areas assumed that has separated by tectonic activity and the emersion of the lithology affected the chemical content of the hot fluid. The Geotermometer indicates that the subsurface of Amohola manifestations temperatures are around 146°C (medium enthalpy), whereas in Sumbersari 43°C (low enthalpy).
ALTERASI DAN MINERALISASI PADA BATUAN PORFIRI ANDESIT DAN PORFIRI GRANODIORIT DI DAERAH CIGABER DAN SEKITARNYA, KABUPATEN LEBAK, PROVINSI BANTEN Prakoso, Jodi; Patonah, Aton; Helmi, Faisal
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1715.243 KB) | DOI: 10.24198/bsc.v14i1.9789

Abstract

Geographically, the study area is located in the Cihara Region, Lebak District, Banten Province. The purpose of this research is to determine alteration zone and  mineralization of porphyry andesite and porphyry granodiorite. The research method is fieldwork and laboratory analysis (petrography and minegraphy analysis). Result of research area, there are seven alteration zone; such as chlorite-sericite-quartz zone, chlorite-sericite-carbonate zone, chlorite-sericite-carbonate-quartz zone, sericite-quartz zone, chlorite-epidote-sericite zone, chlorite-epidote-sericite-carbonate zone, and chlorite-actinolit-biotite zone. Alteration type in research area is devided into three alteration type philic zone, phropilitic zone, and potasic zone. Ore mineral assemblages of research area are dominated by pyrite and calcopyrite according to type model mineral deposite the research area included of epithermal intermediete sulfidation and porphyry type. Keyword : Alteration, Mineralization, Ephitermal Intermediete Sulfidation, porphyry typeSecara Geografis daerah penelitian termasuk dalam Kecamatan Cihara, Kabupaten Lebak, Provinsi Banten. Penelitian ini dilakukan untuk mengetahui tipe alterasi dan mineralisasi daerah penelitian serta sebarannya. Metode penelitian yang dilakukan adalah pemetaan geologi dan analisis laboratorium (analisis petrografi dan minegrafi). Hasil penelitian lapangan dan analisis laboratorium daerah penelitian terbagi menjadi tujuh zona alterasi yaitu zona klorit-serisit-kuarsa, zona klorit-serisit-karbonat, zona klorit-serisit-karbonat-kuarsa, zona serisit-kuarsa, zona klorit-epidot-serisit, zona klorit-epidot-serisit-karbonat, dan zona klorit-aktinolit-biotit. Tipe alterasi daerah penelitian terbagi menjadi tiga tipe alterasi yaitu tipe alterasi filik, propilitik, dan potasik. Mineral bijih yang berkembang pada daerah penelitian didominasi oleh mineral pirit dan kalkopirit menurut model endapan mineral termasuk kedalam tipe endapan epitermal sulfida menengah dan endapan porfiri.           Kata Kunci : Alterasi, Mineralisasi, Epitermal Sulfida Menengah, endapan porfiri