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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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GEOKIMIA BATUAN PENUTUP (OVERBURDEN) BATUBARA UNTUK MEMPREDIKSI POTENSI AIR ASAM TAMBANG DI PIT 1 IUP PWR, DI DAERAH KASAI, KABUPATEN BERAU, KALIMANTAN TIMUR -, Ahmad Helman Hamdani; -, Yoga Adriana Senjaya
Bulletin of Scientific Contribution Vol 9, No 2 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1190.205 KB) | DOI: 10.24198/bsc.v9i2.8265

Abstract

Geochemical studies of cap rock (overburden) on coal mining can be used as an indicator to predict the potential of acid mine drainage (AMD) not from coal itself. Coal overburden at PIT 1 IUP PWR, East Kalimantan composed by clay rocks. Geochemical measurements whic is carried from overburden samples KSD11 and KSD11H; shows that the overburden-based reference SNI 6597-2011 can be categorized as rock Type 1. Plotting on curve grouping PAF / NAF based on the relationship between pH and PAN PPAN KSD11dan KSD11H site shows all samples including NAF group. Analysis of TCLP (toxicity characteristic leaching procedure) showed that low dissolved ferrous metals (0.6 g / L) while the metal content of calcium and magnesium respectively are 0.23 g / L and 0.47 g / L (Table 4.7). When the calculated total of mole equivalents , calcium and magnesium is greater than the iron dissolved, so that although the acid formed will be neutralized. Thus overburden in Likasi PIT 1 is a type of cap rock that not form acid mine drainage when exposed in water and air, so it does not require special handling to prevent the formation of acid mine drainage
MINERAGRAFI BATUAN PENYUSUN TAMBANG DEEP MILL LEVEL ZONE (DMLZ) PT. FREEPORT INDONESIA Ruswanto, .; Rosana, Mega Fatimah; Yuningsih, Euis Tintin; Purwaiswanto, Bambang Antoro
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1106.34 KB) | DOI: 10.24198/bsc.v15i2.13836

Abstract

ABSTRAKDeep Mill Level Zone (DMLZ) merupakan bagian dari cebakan East Erstberg Skarn System (EESS) dan merupakan tambang bawah tanah level ke-empat setelah Tambang Gunung Bijih Timur (GBT), Intermediate Ore Zone (IOZ) dan Deep Ore Zone (DOZ), yang memiliki cadangan sebesar 472 juta ton, dengan kadar tembaga 0,85% dan emas 0,72 g/t. Mineral bijih yang ditemukan berdasarkan analisa mineragrafi di DMLZ adalah kalkopirit, bornit, kovelit, hematit, sfalerit, galena dan pirit. mineral kalkopirit saling terikat dengan mineral pirit, galena dan sfalerit di batuan intrusi, kalkopirit berikatan dengan sfalerit di batugamping Ekmai, kalkopirit terlihat sebagai butiran bebas dan juga berikatan dengan pirit di batuserpih Ekmai, serta kalkopirit-sfalerit-bornit saling berikatan dan kalkopirit terlihat sebagai inklusi di dalam sfalerit dan juga kovelit hadir menggantikan bornit di beberapa bagian Kata kunci: Deep Mill Level Zone (DMLZ), East Ertberg Skarn System (EESS), mineragrafi, mineral bijih. ABSTRACTDeep Mill Level Zone (DMLZ) is one of underground mining in PT. Freeport Indonesia and part of East Erstberg Skarn System (EESS) Complex, located at 4th level below Gunung Bijih Timur (GBT), Intermediate Ore Zone (IOZ) dan Deep Ore Zone (DOZ) with reserve 472 milion ton with garde of Cu 0.85% and Au 0.72 g/t. Ore minerals in DMLZ based on minergraphy are chalcopyrite, bornite, covelite, hematit, sphalerite, galena and pyrite. Chalcopyrite minerals binds with pyrite-galena-sphalerite in intrusive rocks, chalcopyrite binds to sphalerite in the Ekmai limestone, chalcopyrite is seen as free-grained and binds to pyrite in the Ekmai shalestone, as well as chalcopyrite-sphalerite binding and viscous chalcopyrite as inclusions in the sphalerite and present covelite to replace the bornite in some parts Key words: Deep Mill Level Zone (DMLZ), East Ertberg Skarn System (EESS), mineragraphy, Ore minerals.
PENGEMBANGAN PARIWISATA KAWASAN GUNUNG WAYANG DAN SEKITARNYA -, Ildrem Syafri
Bulletin of Scientific Contribution Vol 7, No 1 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.49 KB) | DOI: 10.24198/bsc.v7i1.8232

Abstract

The southern part of Bandung area available some geo-tourism, both was developed or not yet. Wayang Mount area and surrounding are one another that fully developed not yet. That area has geological phenomena and natural preserve. The objective of research is supporting geological information available for tourism developing at Wayang Mount area and surrounding. Main theme of research is modeling of tourism development that cares with environment. Base on literatures study, Bandung area has potency and constraint in connection with area development. That two aspects cause environmental problem that necessary integrated management. Some methods are used to get data; among other are literature study, field survey, and laboratory analysis. Probabilistic approach is used for data analysis.Research result show Wayang Mount area and surrounding is product of Quaternary volcanic. It has gentle to very steeply with elevation about from 1,425 to 2,198 meters from sea level. The drainage patterns are sub-radier, sub-dendritic, sub-parallel, and sub-rectangular. Stream order from 1 to 5 with drainage density reach 8.3 km / square km. Lithology is product of earlier Pleistocene to Holocene volcanic. That lithology consist volcanic breccia, tuff, and lava. A part of them hydrothermal altered and weathered. Base on analysis of microscopic, geochemistry and physic-mechanic show rock and weathering result’s can studied with measured. The available of hot spring in Wayang Mount area is controlled by structure pattern and active tectonic.The tourism development at Wayang Mount and vicinity is supported by strategic location, some geological phenomena, exquisite view, etc. That area is suitable for geo-tourism and agro-tourism development. The constraint aspect in development program is complicated environmental problem. Those problems are Wayang Mount area is natural preserve and main water resource of Citarum River.
KARAKTERISTIK MORFOTEKTONIK DAS BUOL BAGIAN HULU YANG TERSUSUN OLEH BATUAN BERUMUR KUARTER DAN TERSIER KABUPATEN BUOL PROVINSI SULAWESI TENGAH Ghaniansah, Algi Fajar; Tawil, Sukardan; Muslim, Dicky; Sukiyah, Emi
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v14i2.9806

Abstract

The research area is part of the Watershed Buol. Administratively, it is included in the  Tiloan District, Buol Regency, Central Sulawesi Province. The parameters used in the study include drainage patterns, watershed morphometric, morphotectonic, and geological structure. Parameters such as a reference to explain the tectonic activity in the area of research. Variables analyzed includes bifurcation ratio (Rb), drainage density (Dd), mount-front sinuosity (Smf), and the ratio of the wall and the bottom of the valley (Vf ratio). Quantitative descriptive approach used in the data analysis. The results showed that the average value of Rb is 2.14 with Dd ranges from 0.25 to 10. That phenomenon shows that the study area is controlled by tectonic based on morphometric analysis of the watershed. Smf values ranged from 1.1 to 1.6, while the Vf ratio ranges from 0.3 to 3.8. The results of the comparative test against morphometric-morphotectonic variables in the region composed of Quaternary and Tertiary rocks, showed a significant difference.Key words: Buol watershed, watershed morphometry, morphotectonic, and tectonic activity Daerah penelitian merupakan sebagian dari Daerah Aliran Sungai (DAS) Buol. Secara administratif termasuk dalam Kecamatan Tiloan, Kabupaten Buol, Provinsi Sulawesi Tengah. Parameter yang digunakan dalam penelitian diantaranya adalah pola pengaliran, morfometri DAS, morfotektonik, dan struktur geologi. Parameter tersebut menjadi acuan untuk menjelaskan aktivitas tektonik di daerah penelitian. Variabel yang dianalisis meliputi rasio cabang sungai (Rb), kerapatan pengaliran (Dd), sinusitas muka gunung (Smf), dan rasio dinding dan dasar lembah (Vf ratio). Pendekatan deskriptif kuantitatif digunakan dalam analisis data. Hasil penelitian menunjukkan bahwa nilai Rb rata-rata 2,14 dengan Dd berkisar dari 0,25 hingga 10. Fenomena tersebut menunjukkan bahwa daerah penelitian dikontrol oleh tektonik berdasarkan analisis morfometri DAS. Nilai Smf berkisar  1,1 – 1,6, sementara itu Vf ratio berkisar 0,3 – 3,8. Hasil uji komparatif terhadap variabel morfometri dan morfotektonik DAS di wilayah yang tersusun oleh batuan berumur Kwarter dan Tersier, menunjukkan adanya perbedaan yang signifikan. Hal ini dapat diinterpretasikan bahwa tektonik pada Kuarter dan Tersier menghasilkan pola yang berbeda.Kata Kunci: DAS Buol, Morfometri DAS, Morfotektonik dan Aktivitas Tektonik.
SISTEM POROSITAS RESERVOIR BATUAN KARBONAT PADA SEKUEN DROWNING CAP, FORMASI KUJUNG ATAS DI LAPANGAN VITA, CEKUNGAN JAWA TIMUR DEWI, VISKA TRIARAMINTA; Mardiana, Undang; Mohammad, Febriwan; Ahdyar, LaOde
Bulletin of Scientific Contribution Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16869.888 KB) | DOI: 10.24198/bsc.v17i2.22992

Abstract

ABSTRAKBatuan karbonat merupakan batuan yang banyak ditemukan sebagai batuan reservoir. Hal ini tentu dikarenakan batuan karbonat memiliki nilai porositas dan permeabilitas yang baik. Namun, tingginya kompleksitas dan heterogenitas dari batuan karbonat membuat suatu kualitas reservoir batuan karbonat sulit di prediksi. Distribusi sistem porositas batuan karbonat sangat dikontrol oleh litofasies dan juga proses diagenesis. Maka, interaksi dari kedua faktor tersebut akan menghasilkan variasi jenis porositas yang nantinya akan mempengaruhi nilai permeabilitas dari suatu reservoir.Objek penelitian ini adalah Reservoir Vita yang merupakan karbonat build up, berumur Oligosen hingga Miosen di Formasi Kujung Atas. Reservoir ini telah menjadi produsen minyak terbesar di Indonesia dan saat ini telah menghasilkan sejumlah hidrokarbon yang banyak. Dengan menggunakan data batuan inti sepanjang 429 ft (keseluruhan) dan lebih dari 500 sayatan tipis pada 3 sumur, penelitian ini bertujuan untuk mengetahui variasi dari sistem pori pada sekuen Drowning Cap di Reservoir Vita. Analisa kualitatif dilakukan untuk mendeterminasi jenis porositas reservoir yang terdiri atas interparticle, separated vugs (moldic), touching vugs, microfracture, dan minimum dissolution. Kelima jenis porositas ini terbentuk pada litofasies yang berbeda-beda. Tentu hal ini menunjukkan bahwa, sistem porositas pada objek penelitian tidak hanya dikontrol oleh tekstur, melainkan oleh proses diagenesis yang terjadi. Pemahaman terkait sistem porositas di reservoir drowning cap ini tentu menghasilkan dampak yang baik untuk mengetahui distribusi kualitas reservoir yang komprehensif. Kata Kunci : Jenis porositas, diagenesis, Reservoir Batuan Karbonat  ABSTRACTCarbonate rocks known as one of a common major reservoir rock in the world due to its good porosity and permeability. However, its heterogeneity makes the variability of carbonate reservoir quality is difficult to predict. Carbonate pore system distribution is controlled by the lithofacies and also by the occurrence of diagenetic process. Therefore, this interaction results the variation of pore types that will eventually define the permeability of the reservoir.The object of this research is Reservoir Vita which is an Oligocene to Miocene carbonate build up reservoir, specifically in Drowning Cap Sequence. Vita Reservoir is located in East Java Basin, Upper Kujung Formation which has becoming the largest oil producer in Indonesia and currently it has been producing a significant amount of hydrocarbon. By using cores (429 ft in total) and more than 500 thin sections data from 3 wells, this research aims to observe the variety of total pore system in drowning cap sequence in Reservoir Vita. Qualitative analysis was done in determining the pore types of reservoir that consist of interparticle, separated vugs (moldic), touching vugs, microfracture, and minimum dissolution. These five pore types are encountered in wide variety of lithofasies or depositional facies. Thus, this observation has proved that the pore system distribution in research object, is not only mainly controlled by its texture, but also strongly controlled by diagenetic process and it results different value of porosity and permeability. Understanding of pore system in drowning cap reservoir will bring significant value comprehensive reservoir quality distribution.  Keywords: Pore types, Diagenetic prosses, Carbonate Reservoir
DAYADUKUNG TANAH UNTUK BERBAGAI TIPE FONDASI TAPAK PADA LEMPUNG PLASTISITAS TINGGI DI BEBERAPA LOKASI, KABUPATEN MAJALENGKA, JAWA BARAT -, Zufialdi Zakaria; -, Agung Mulyo; -, Luthfan H. Jihadi; -, M. Bey Anural
Bulletin of Scientific Contribution Vol 11, No 2 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (681.053 KB) | DOI: 10.24198/bsc.v11i2.8288

Abstract

The research location at Majalengka and its surrounding, West Java. The study was conducted in an effort to know soil bearing capacity for various types of foundations which depend on the physical and material properties of the soil. Location of samples obtained from three locations: Kertajati, Cikijing and Cigintung. Samples obtained in the form of high plasticity clay (CH) with the activity rate (A) between 1.01 to 1.42 (with Skempton method) or 1.12 to 1.61 (the Seed method), samples are high activity clays, included of monmorilonitic mineral. Alloweble soil bearing capacity (qa) for a square foundation type, between 11.04 to 19.50 T/M2; for a circular (rounded) foundation types, from 11.00 until 19.07 T/M2; and for the type of continuous foundation, between 8 , 85 to 15.28 T/M2. To avoid of the failure of the foundation, the building load should not exceed the value of allowable soil bearing capacity. The estimated expansive soils, soil improvement is required to be done. 
POLA PERSEBARAN DAN ESTIMASI CADANGAN ANDESIT PADA DESA CILULUK, KECAMATAN CICALENGKA, KABUPATEN BANDUNG Swastika, Arif; Syafriyono, .; Dipo, Caesario; Pratama, Ahmad Yuda; Kartanegara, Sony Malik; Khorniawan, Wahyu Budhi; Sayyidi, Muhammad; Natasia, Nanda
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 (1193.448 KB) | DOI: 10.24198/bsc.v16i2.17919

Abstract

Abstrak - Andesit merupakan komoditas mineral non-logam yang berpotensi sebagai sumber bahan galian C. Desa Ciluluk, Kecamatan Cicalengka, Kabupaten Bandung secara tatanan geologi termasuk ke dalam Satuan Batuan Gunungapi Mandalawangi-Mandalagiri yang terdiri dari tuf dan lava berkomposisi andesit. Oleh karena itu, daerah ini dipilih sebagai lokasi studi untuk mengetahui pola persebaran andesit dan estimasi cadangannya. Pola persebaran andesit di daerah penelitian diprediksi berdasarkan data hasil survey geolistrik 1D dan 2D. Kemudian, estimasi cadangan dihitung menggunakan model sebaran 3D yang terbagi menjadi 2 skenario penambangan dengan mempertimbangkan kondisi topografi dan sebaran andesit. Berdasarkan pengamatan lapangan, andesit di daerah penelitian tersebar tidak merata dan dapat dibedakan menjadi 2 jenis yaitu soft dan hard andesite. Kedua tubuh andesit ini memiliki pola sebaran barat-timur dengan kenampakan fisik serta nilai resistivitas yang berbeda dimana hard andesite memiliki nilai resistivitas yang lebih tinggi (>350 Ωm). Hasil perhitungan cadangan menunjukkan bahwa cadangan andesit berkisar antara 3.861.267 ton untuk skenario 1 hingga 9.617.227 ton untuk skenario 2. Lebih lanjut, nilai cadangan ini bisa dibandingkan dengan melakukan perhitungan cadangan terukur berdasarkan data pengeboran disertai pengukuran topografi secara lebih rinci. Kata kunci – Andesit, Geolistrik, Cicalengka
SIKLUS PENGENDAPAN KUARTER BERBASIS KARAKTERISTIK PERUBAHAN MUKA LAUT DI LEMBAH KRUENG ACEH, ACEH BESAR, PROVINSI NANGROE ACEH DARUSSALAM -, Herman Moechtar; -, Zulfiadi Zakaria
Bulletin of Scientific Contribution Vol 8, No 3 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1170.37 KB) | DOI: 10.24198/bsc.v8i3.8256

Abstract

Studies of the Quaternary depositional cycles based on character of sea-level changes in the Krueng Aceh Valley ( Aceh Besar), revealed seven of depositional fasies. These depositional fasies consist of beach/ beach ridges (Fep/ Fepp), nearshore (Feldp), offshore (Fellp), river channel (Feas), floodplain (Fedb), swamp (Fer), and marsh (Ferb) deposits. Based on correlation of the lateral and vertical variation of the Quaternary deposits, four Interval of depositional facies (IFP A-D) occurred. Each of depositional facies is, characterized by variation of the depositional environment alternating which is controlled by sea-level changes under influenced by climate circulation and tectonic. Probably, the character of each depositional interval could be called as cycle of five ordo of sea level changes which correlated with Milankovitch cycle of 20,000 years.The study was based on analyses of sedimentology and stratigraphy of nine borehole informations, and the penetration of the bore head varied from 51,50 to 125 m. Three stratigraphical cross section have been correlated, that is BD2 – BD8, BD2 – BD5, and BD8 – BD5 cross sections.
IMPLIKASI KADAR AIRTANAH TERHADAP DAYADUKUNG TANAH DI WILAYAH GAMBIR DAN SEKITARNYA Yuda, Himmes Fitra; Zakaria, Zufialdi; Sukiyah, Emi
Bulletin of Scientific Contribution Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (732.017 KB)

Abstract

ABSTRACTThe research area is in Gambir and surround it, Central Jakarta and West Jakarta municipality. The study to learn the characteristics of the soil in the research area. The relationship of water content and soil bearing capacity is known from secondary data of soil investigation at four locations sampled. Based on observations of four soil samples, the highest water content is in sample HF-3 at 68.28%, and the lowest water content is in sample HF-4 by 48%. Depend on the soil bearing capacity value, sample HF-3 has the lowest value, which is 2.64 T / M2. The highest soil bearing capacity value is found in the sample HF-4, which is 25.49 T / M2. Regression correlation test results showed that in dry conditions / low water content, the value of soil bearing capacity will be high, meanwhile in wet conditions, water levels will rise, so the value of the soil bearing capacity will be smaller than in dry conditions. Keywords : Soil bearing capacity, water content ABSTRAKLokasi penelitian berada pada wilayah Gambir dan sekitarnya, kotamadya Jakarta Pusat dan Jakarta Barat. Studi ini untuk mempelajari karakteristik tanah pada daerah penelitian. Hubungan kadar air dan daya dukung tanah diketahui dari data penyelidikan tanah di 4 lokasi sampel. Berdasarkan pengamatan dari 4 sampel tanah, nilai kadar air tertinggi adalah pada sampel HF-3 sebesar 68,28%,  nilai kadar air terendah adalah pada sampel HF-4 sebesar 48%. Jika dilihat dari nilai dayadukung tanah, sampel HF-3 memiliki nilai yang paling rendah, yaitu sebesar 2,64 T/M2. Nilai dayadukung tanah yang tertinggi ada pada sampel HF-4 sebesar 25,49 T/M2. Dari hasil uji regresi korelasi menunjukan bahwa pada kondisi kering/kadar air rendah, nilai dayadukung tanah akan besar, sementara pada kondisi basah, kadar air akan meningkat, sehingga nilai dayadukung tanah akan menjadi lebih kecil dibandingkan dengan kondisi kering. Kata Kunci : Dayadukung tanah, kadar air
GEOLOGI DAN ANALISIS TEKTONIK DAERAH KAMPAR SUMATRA TENGAH -, Faizal Muhamadsyah; -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 6, No 2 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (736.953 KB) | DOI: 10.24198/bsc.v6i2.8162

Abstract

Central Sumatera basin controlled by an amount of regional stike-slip fault (wrench fault) moving on transtensinal system. Overall srike-slip pattern forming as negative flower structure, yielding horst and garben. This tecotonic process happened in Early Miocene.Graben forming begin the sedimentation process which indicate the coarse clastica deposit existence that goes on fluvial environment. This deposit equivalent with Sihapas formation that have an age of Eosen. The Sedimentary basin had a subsidence continuously till Middle of Miocene, that indicated by developt marine sedimentary rock.In Plio-Pleistocene, the uplifting processes is happen again that cause forming of fold and fault structure. Tectonic compression cause the research area more shallow and then become a continent. This is indicated by developted conglomerate, sandy conglomerate, tuffaceous sandstone which forming in continent.

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