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Bulletin of Scientific Contribution : Geology
Published by Universitas Padjadjaran
ISSN : 16934873     EISSN : 2541514X     DOI : doi.org/10.24198/bsc%20geology.v18i1
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science
BSC Geology adalah jurnal yang dikelola oleh Fakultas Teknik Geologi Universitas Padjadjaran,terbit 3 kali dalam setahun (April, Agustus, dan Desember), yang menerbitkan karya tulis ilmiah dalam bidang kebumian terutama yang berkaitan dengan geologi seperti : Petrologi Paleontologi Geomorfologi Stratigrafi Geologi Dinamik Geologi Lingkungan dan Hidrogeologi Geologi Teknik Geokimia Geofisika Sedimentologi. Setiap artikel yang akan diterbitkan adalah bersifat tanpa biaya (no processing charges dan no submission charges). Dewan redaksi dan penerbit tidak pernah meminta bayaran untuk penerbitan pada jurnal ini. Tujuan dari jurnal ini adalah untuk memperkaya pengetahuan dan informasi tentang ilmu kebumian dan dapat dimanfaatkan untuk kemaslahatan bersama.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 413 Documents
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ANALISIS GEOMEKANIKA FORMASI HALANG DI DAERAH STRUKTUR GEOLOGI SEKITAR SUNGAI CITAAL, KUNINGAN, JAWA BARAT -, Zufialdi Zakaria
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (348.939 KB) | DOI: 10.24198/bsc.v4i1.8110

Abstract

Lithology at research area consist of sandstone, claystone and brecia which include to Halang Formation. Structure of geology is sinistral strike-slip fault with relative strike to southwest - northeast. Geomechanic analysis given a number of Rock Mass Rating and Slope Mass rating as follows: Rock mass rating is 55 to 66. RMR to foundation is 48 to 50. Description of class number is 3 (III), its mean fair rock.Slope mass rating given number of slope angle which is suggested to stable slope, as follows: According to Laubscher (1975) SMR is 55o. According to Hall (1985) SMR is 56.20o to 63.35o. According to Orr (1992) SMR is 64.49o to 71.71o . Environmental management is preventive effort of impact which attend with foundation design according to allowable bearing capacity and / or choice the architecture of building to safety. Monitoring can be conducted to condition of building (house, bridge, drainage etc.)
PENDUGAAN KETERDAPATAN AKIFER AIRTANAH DENGAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI SUB-DAS CISATANG - KABUPATEN CIANJUR Mardiana, Undang; Endyana, Cipta
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 (942.781 KB) | DOI: 10.24198/bsc.v12i2.8366

Abstract

Geoelectric measurements committed in an attempt to obtain the presence, depth, thickness, number and spread of the aquifer. From the interpretation of Schlumberger geoelectric method (Sounding) acquired seven units of lithology, three units are classified as permeable layer, and four units as impermeable layers. The layer that functions as the aquifer has a resistivity value between 200-400 Ωm which is interpreted as a breccia with component-gravel gravel unit, 100-200 Ωm which is interpreted as breccia matrix supported by granule-sized components peble unit, and 50-100 Ωm which is interpreted as breccia matrix supported with gravel-sized component unit. Distribution of the three rocks in the study area is dominated by a nearly breccia grain supported. While units with resistivity values above 400 Ωm and under 50 Ωm interpeted as an impermeable layer-semipermeable. Faults that developed in the study area has direction a northwest-southeast. Those fault caused the fracture system that developed on volcanic deposits in this area. Therefore the zone bounded by two faults are thought to have better porosity values as the aquifer is supported by fracture with a higher intensity in surrounding area.
Duboisia santeng (BOVIDAE, ARTIODACTYLA) DARI BUMIAYU Suharyogi, Ifan Yoga Pratama; Wibowo, Unggul Prasetyo; Insani, Halmi; Setiyabudi, Erick
Bulletin of Scientific Contribution Vol 17, No 1 (2019): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (711.943 KB) | DOI: 10.24198/bsc.v17i1.20639

Abstract

Telah ditemukan sebuah spesimen fosil tanduk bovidae sebelah kiri pada penelitian lapangan tahun 2016 di Kali Santanaya, Cisaat (Bumiayu). Fosil tanduk tersebut disebandingkan dengan fosil Boselaphus tragocamelus, Tetracerus quadricornis, Bibos palaeosondaicus, Bibos javanicus, Bubalus palaeokerabau, Epileptobos groeniveldtii, dan Duboisia santeng berdasarkan morfologi dan ukurannya. Walaupun merupakan temuan permukaan, namun berdasarkan analisa geologinya disimpulkan berasal dari Formasi Gintung dan berdasarkan biostratigrafi fauna vertebrata dimungkinkan termasuk Unit Fauna Kedung Brubus dengan lingkungan hidup berupa lingkungan hutan yang terbuka.
PETROLEUM SYSTEM CEKUNGAN KUTAI BAGIAN BAWAH, DAERAH BALIKPAPAN DAN SEKITARNYA, PROPINSI KALIMANTAN TIMUR -, Yuyun Yuniardi
Bulletin of Scientific Contribution Vol 10, No 1 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v10i1.8274

Abstract

Oil and gas potential in Lower Kutai Basin were probably exist, those condition have checked from well petroleum system to support oil and gas accumulation in this area. Data integration of source rock, reservoir rock, cap rock, trap assotiation, and migration system in Lower Kutai Basin could be doing advance research to proving oil and gas accumulation.
ZONASI ANOMALI UNSUR GEOKIMIA DI WEDA, KABUPATEN HALMAHERA TENGAH, MALUKU UTARA BERDASARKAN DATA UNIVARIAT DAN MULTIVARIAT Fadhly, Ahmad; Syafri, Ildrem; Abdurrokhim, .
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (696.939 KB) | DOI: 10.24198/bsc.v15i3.15102

Abstract

ABSTRACTThe research area is located in the Weda Region, Central Halmahera Regency, is a path of metal mineralization which belongs to the Halmahera magmatic arc. The study area has a coverage area of 10 km x 15 km. The purpose of this study is to reveal the availability of major elements content (Cu, Pb, Zn, Co, Ni, Mn, Ag, Li, K, Fe, Cr and Au) on river deposits in the form of maps of the major elements content. Geochemical data collection is done on intermittent river. The identification of the metal content of the samples taken was done in the PSMBP geochemistry laboratory using the Atomotic Absorbtion Spectrometry Logametri (AAS) method. A total of 12 elements have been analyzed for the levels in the highest samples of stream sediment and treated to obtain anomaly zone. In this case SPSS 21.0 software is used for identification anomaly based on the correlation value between elements, then the research area there are two elemental associations that have kinship in accordance with univariate statistics, multivariate with factor analysis test. The two elemental association elements: 1) Ni-Co-Li-K-Cr. The formation of Factor 1 shows a strong relationship between Ni as well as the associations Co, Li, K and Cr associated with the regional geological conditions of the study area, which is occupied by rock dominance mafic rock and ultramafiic rock. 2) Cu-Zn-Mn-Ag-Fe. The formation of Factor 2 was obtained based on the incorporation of geochemical data analysis results reflected from elemental associations in the surface environment of the Sulfide Ore Complex. The existence of this mineral is closely related to hydrothermal alteration. Keywords: Geochemistry, mineralization, Atomotic Absorbtion Spectrometry Logametri (AAS) method. ABSTRAKDaerah penelitian terletak di Daerah Weda, Kabupaten Halmahera Tengah, merupakan jalur mineralisasi logam yang termasuk ke dalam Halmahera magmatic arc, dan mempunyai cakupan wilayah 10 km x 15 km. Tujuan dari penelitian ini adalah untuk mengungkapkan keterdapatan kandungan unsur logam (Cu, Pb, Zn, Co, Ni, Mn, Ag, Li, K, Fe, Cr dan Au) pada endapan sungai dalam bentuk peta kandungan unsur logam tersebut. Pengambilan data geokimia dilakukan pada sungai intermitten. Identifikasi kandungan unsur logam dari contoh yang diambil dilakukan di laboratorium geokimia PSMBP menggunakan metoda Atomotic Absorbtion Spectrometri Logametri (AAS). Sebanyak 12 unsur telah dianalisis kadarnya di dalam percontohan sedimen sungai dengan kadar yang tertinggi dan diolah untuk mendapatkan zona anomalinya. Dalam hal ini software SPSS 21.0 dipakai untuk penentuan anomalinya berdasarkan nilai korelasi antar unsur, maka di daerah penelitian terdapat dua asosiasi unsur yang memiliki kekerabatan sesuai dengan data statistik univariat, multivariat dengan uji analisis faktor. Kedua asosiasi kekerabatan unsur tersebut adalah: 1) Ni- Co -Li-K-Cr, Pembentukan Faktor 1 memperlihatkan adanya hubungan yang kuat antara Ni serta asosiasi Co, Li, K dan Cr yang dikaitkan dengan kondisi geologi regional daerah penelitian, yaitu ditempati oleh dominasi batuan beku basa dan ultrabasa. 2) Cu-Zn-Mn-Ag-Fe. Pembentukan Faktor 2 didapat berdasarkan penggabungan hasil analisis data geokimia yang tercerminkan dari asosiasi unsur di lingkungan permukaan Komplek Bijih Sulfida. Keberadaan mineral ini erat kaitannya dengan alterasi hidrotermal. Kata Kunci: Geokimia, mineralisasi, metoda Atomotic Absorbtion Spectrometri Logametri (AAS).
POTENSI BAHAN GALIAN PASIR KUARSA DI KECAMATAN LABUHAN MARINGGAI, KABUPATEN LAMPUNG TIMUR, PROVINSI LAMPUNG -, Agung Mulyo
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.288 KB) | DOI: 10.24198/bsc.v5i2.8137

Abstract

District of Labuhan Maringgai, Sub-Province East Lampung, Lampung, richly of quartz-sand. Potency, amount of reserve, quality of every type of quartz-sand is important to know. Mapping of natural resources specially quartz-sand is required for development program of Lampung area, especially related to invesment and promotion in mining.Almost of all region of Labuhan Maringgai District consist of quartz-sand. Quartz-sand which good quality (Sio2 > 95 %) there are in Sukorahayu (1.768.000 m3), Sriminosari (1.006.500 m3), Karya Makmur (1.320.000 m3), and Karya Tani (3.082.000 m3).
POTENSI GEOWISATA DI KAWASAN TELUK CILETUH, SUKABUMI, JAWA BARAT Hardiyono, Adi; Syafri, Ildrem; Rosana, Mega F.; Yuningsih, Euis Y.; -, Herry; Andriany, Suci Sarah
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (853.992 KB) | DOI: 10.24198/bsc.v13i2.8396

Abstract

Ciletuh be local Geopark since August 2014, and now towards preparing to become a National Geopark. This geopark is proposed by the government of Sukabumi in 2014. Remains of the geology in this geopark is the emergence of ophiolite complex as a result of fossil tectonic subduction between the Eurasian plate and the Indo-Australian Plate at the age cretasius. Geomorphology tectonic activity form the shape known as the Ciletuh amphitheater, and also the unique shapes result of water erosion that formed the rocks that looks into unique shapes like dragon-stone, frogs-rock, buffalo-stone. etc. There is also the conservation of green turtles and other wild animals such as sea eagles, panthers also conservation Raflesia flowers, Cantigi and mangrove forests to support geopark Ciletuh. Geopark Ciletuh can be divided into four complexes, namely Geoarea Tamanjaya, Geoarea Ciwaru-Mount Rhinos, Geoarea Citisuk-Cikepuh and Geoarea Citirem Ujunggenteng.Some programs geotrek made to visit geoarea either road, or by sea with a boat, also made supporting facilities such as hotels, homestays, local guides and signs.
Analisis Kerentanan Gempa pada Jalur Sesar Baribis menggunakan Metode Microearthquake (MEQ) Febyani, Siska; K, Mohammad Fatahillah Pradana; Rivaldy, Mohammad; Syafri, Ildrem; Nur, Andi Agus; Embara, Patra; Nugroho, Sigit Dwi
Bulletin of Scientific Contribution Vol 18, No 1 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1122.199 KB) | DOI: 10.24198/bsc.v18i1.25941

Abstract

Di Jawa Barat, terjadi beberapa gempa tektonik yang berasal karena aktivitas sesar, diantaranya adalah Sesar Cimandiri, Sesar Baribis, Sesar Citanduy dan Sesar Lembang. Salah satu sesar yang diperkirakan aktif adalah Sesar Baribis. Sehubungan dengan hal tersebut telah dipasang 3 seismometer di 3 desa yaitu: Desa Jatigede di Sumedang, Dusun Anggrawati dan Desa Sinar Galih keduanya berada di Kabupaten Majalengka. Tujuan kajian ini adalah mendeteksi adanya gempabumi mikro yang terjadi di jalur Sesar Baribis menggunakan metode Microearthquake (MEQ), sebagai langkah verifikasi secara faktual di lapangan sehingga tingkat aktivitas yang berlangsung pada jalur Sesar Baribis tersebut dapat diketahui. Hasil dari perekaman Microearthquake (MEQ) menunjukkan jumlah kejadian gempa yang terekam selama 60 hari adalah 46 gempa dari skala 0,1 Mw hingga 3,2 Mw. Kedalaman gempa terdangkal adalah 1 km dan yang terdalam adalah 85 km. Sumber gempa dominan adalah pada Zona Sesar Baribis dengan kedalaman gempa kurang dari 50 km. Arah dan rezim gaya yang tercatat dari perhitungan momen tensor memperlihatkan sesar naik dan sesar geser. Berdasarkan kedalaman data perekaman MEQ dan pengamatan permukaan, Zona Sesar Baribis diperkirakan adalah sesar aktif.
BIO-ENGINEERING, MELALUI PEMANFAATAN TANAMAN KALIANDRA (CALIANDRA CALOTHYRSUS) DI WILAYAH ZONA RAWAN LONGSOR JAWA BARAT -, Zufialdi Zakaria; -, Dicky Muslim; -, Raden Irvan Sophian; -, Sondi Kuswaryan; -, Ujang Hidayat Tanuwiria
Bulletin of Scientific Contribution Vol 11, No 3 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.022 KB) | DOI: 10.24198/bsc.v11i3.8297

Abstract

Landslides prone areas can be occur due to a large slope, open slopes, large erosion rate, or a large infiltration. Landslide prone areas can be prevented by a stable slope engineering. Engineering of stable slopes can be integrated through a variety of methods with preliminary procedure : 1) Mapping of landslides prone areas, 2) Slope stability analysis through the study of Safety Factor, 3) Engineering of slope stabilization and integrated through the simulation stable slope, slope design and other engineering, 4) Environmental management and environmental monitoring, 5) Bio-engineering by utilizing plants as part of a stable slope engineering systems, namely as a preventive agent of erosion, reduction of infiltration and runoff flow, landslide prevention as well as strengthening the slopes . Engineering can use the model of Starlet (Stabilisati dan Rancangbangun Lereng Terpadu, or Engineering of Slope Stabilization and Integrated) involving the role of government officials, industrial and businessmen , residents / communities , and scientists . Kaliandra chosen to be a plant that is part of a stable slope engineering . Kaliandra plants have a good root, the tree canopy is not heavy, high-protein leaves for fodder, stems and twigs are dried for energy (fuelwood ) . These plants, in addition to prevention of landslides, will be useful for people and industry. 
NILAI DAN JENIS POROSITAS BATUPASIR PADA FORMASI WALATDI DAERAH CICANTAYAN, KABUPATEN SUKABUMI BERDASARKAN METODE PETROGRAFI Firmansyah, Yusi; Mardiana, Undang; Kurniawan, Endy; Nurdrajat, .; Gani, Reza Mohammad Ganjar
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (878.6 KB) | DOI: 10.24198/bsc.v16i3.20224

Abstract

ABSTRACTStudy of sandstone porosity Walat Formation in Sukabumi, West Java is a step to get information about the value and type of porosity that develops in this area. Sandstones that have good porosity can potentially become reservoir rocks but not all sandstones have good porosity. Systematic modeling of Walat Formation outcrops which are believed to have potential as reservoir rocks are analyzed in the laboratory to see their porosity. Eight samples were selected and analyzed by petrographic method to determine the type of porosity and calculate the sandstone porosity value of the Walat Formation located in Cicantayan Village, Cisaat District, Sukabumi District. Based on the results of petrographic analysis, all sandstone samples in the study area have intergranular primary porosity and have sufficient to special porosity values. Based on this research, it can be said that in general the sandstones in the study area have very good porosity which has the potential to be a good reservoir rock.Keywords: Walat Formation, sandstone, porosity, petrographic analysis.ABSTRAKKajian porositas batupasir Formasi Walat di Sukabumi, Jawa Barat merupakan suatu langkah untuk mendapatkan informasi mengenai nilai dan jenis porositas yang berkembang pada daerah ini. Batupasir yang memiliki porositas yang baik dapat berpotensi menjadi batuan reservoir namun tidak semua batupasir memiliki porositas yang baik. Sistematika pemercontohan singkapan Formasi Walat yang diyakini berpotensi sebagai batuan reservoar di analisis ke laboratorium untuk dilihat porositasnya. Sebanyak delapan percontoh terpilih dan dianalisis dengan metode petrografi untuk mengetahui jenis porositas serta menghitung nilai porositas batupasir Formasi Walat yang terletak di desa Cicantayan, Kecamatan Cisaat, Kabupaten Sukabumi. Berdasarkan hasil analisis petrografi semua percontoh batupasir di daerah penelitian memiliki porositas primer intergranular dan memiliki nilai porositas yang cukup hingga istimewa. Berdasarkan penelitian ini dapat dikatakan secara umum batupasir didaerah penelitian memiliki porositas yang sangat baik sehingga berpotensi menjadi batuan reservoir yang baik.Kata Kunci: Walat Formation, sandstone, porosity, petrographic analysis.

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