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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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FENOMENA MORFOTEKTONIK PADA CITRA STRM DI WILAYAH TELUK KENDARI Yasin, Andi Makawaru; Sukiyah, Emi; Sulaksana, nana; Isnaniawardhani, Vijaya
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 | Full PDF (1414.626 KB) | DOI: 10.24198/bsc.v14i2.9802

Abstract

Kendari bay has a strategic position in Southeast Sulawesi. In this region there is a city of Kendari, the capital of the province. The unique shape is a product of the collision of tectonic plates, occupies the southeast arm of Sulawesi. There might be a strong tectonic control in the region. The up lift process continues sustainable, evidence was also recorded in the landscape. The phenomenon morphotectonic show unique patterns that are easily recognizable on remote sensing data. The data used in this study is derived from SRTM imagery. Besides lineament associated with geological structure, the DEM can also be obtained from that image. Sun-shading technique used to clarify the appearance of lineament associated with geological structure. The lineament data plotted into a rosette diagram to determine the general trend. The lineament density data obtained by calculating the ratio of the total length of lineament in each grid of 5x5 sq km. The results showed that the morphotectonic phenomenon easily recognizable in the SRTM imagery. Sun-shading techniques can clarify lineament patterns associated with the presence of fault. Zone of lineament density increase indicates an irregular pattern and generally at the level of more than 400 meters above sea level, located in the northern and southern approached Wolasi Mountains. At an elevation of less than 400 meters above sea level, low lineament density between 0 to 8 km /sq km. This phenomenon indicates that the area has undergone a process of denudation. Lineament pattern trending NE-SW reflect the release of the compression process LAWANOPO shear fault trending NW-SE. Keywords: Morphotectonic, SRTM image, lineament, GIS, Kendari Bay Teluk kendari memilki nilai strategis di Provinsi Sulawesi Tenggara. Di wilayah ini terdapat Kota kendari yang merupakan ibu kota provinsi. Bentuknya yang unik merupakan produk tumbukan lempeng tektonik, berada di lengan tenggara Sulawesi. Tidak salah jika ada kontrol tektonik yang cukup kuat di wilayah ini. Proses pengangkatan secara berkesinambungan terus berlangsung, bukti-buktinya juga terekam pada bentang alam di wilayah ini. Fenomena morfotektonik menunjukkan pola-pola yang unik sehingga mudah dikenali pada data penginderaan jauh. Data yang dipergunakan dalam penelitian ini berasal dari citra SRTM.  Di samping kelurusan yang berasosiasi dengan struktur geologi, dari citra tersebut juga diperoleh DEM. Teknik sun-shading digunakan untuk memperjelas kenampakan kelurusan-kelurusan yang berasosiasi dengan struktur geologi. Data hasil interpretasi kelurusan diplot ke dalam diagram rose untuk mengetahui arah umum. Data kerapatan kelurusan diperoleh dengan cara menghitung perbandingan total panjang kelurusan dalam setiap grid yang berukuran 5x5 km2. Hasil penelitian menunjukkan bahwa fenomena morfotektonik mudah dikenal pada citra SRTM. Teknik sun-shading dapat memperjelas pola-pola kelurusan yang berasosiasi dengan keberadaan sesar. Zona peningkatan densitas kelurusan menunjukkan pola yang tidak teratur dan secara umum berada pada level > 400 mdpl, terdapat di bagian utara dan selatan mendekati Pegunungan Wolasi. Pada elevasi < 400 mdpl, densitas kelurusan rendah antara 0 sampai 8 km/km2. Fenomena ini menunjukkan bahwa daerah tersebut telah mengalami proses denudasi. Pola kelurusan berarah NE-SW mencerminkan realese dari proses compression sesar geser LAWANOPO berarah NW-SE.   Kata Kunci : Morfotektonik, citra SRTM, kelurusan, SIG, Teluk Kendari
Investigasi Lapisan Akuifer Berdasarkan Data Vertical Electrical Sounding (VES) dan Data Electrical Logging; Studi Kasus Kampus ITERA Rizka, .; Satiawan, Soni
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 (1143.222 KB) | DOI: 10.24198/bsc.v17i2.22393

Abstract

ABSTRAKTelah dilakukan pengukuran geolistrik Vertical Electrical Sounding (VES) dengan 33 titik sounding untuk mengidentifikasi geometri akuifer yang terdapat di kampus ITERA. Konfigurasi yang digunakan pada pengukuran Vertical Electrical Sounding (VES) adalah konfigurasi Schlumberger. Karena target penelitian ini adalah akuifer dengan variasi kedalaman dari permukaan hingga lebih dari 100 meter di bawah permukaan sehingga panjang garis pengukuran dibuat bervariasi, nilai minimum dan maksimum AB / 2 masing-masing adalah 2 dan 150 meter. Sedangkan perubahan MN / 2 dilakukan tiga (3) kali (0.5, 2, dan 10 meter). Hasil pengolahan data geolistrik Vertical Electrical Sounding (VES) dikorelasikan dengan data sekunder berupa data sumur electrical logging resistivity dan Spontanous Potential (SP). Berdasarkan hasil pengolahan data Vertical Electrical Sounding (VES) yang dikorelasikan dengan data sumur electrical logging resistivity dan Spontanous Potential (SP), daerah kampus ITERA memiliki potensi akuifer bebas (unconfined aquifer) dan akuifer tertekan (confined aquifer). Akuifer bebas diduga merupakan batuan tuff dengan nilai resistivitas tinggi (>80 Ωm) yang ditemukan pada kedalaman dangkal (< 5 meter dari permukaan). Akuifer tertekan diduga merupakan pasir tuffan dengan nilai resistivitas menengah (20 – 80 Ωm) ditemukan pada kedalaman dalam (>75 m dari permukaan).Kata kunci: Akuifer, VES, Electrical Logging, ITERAABSTRACTGeoelectric measurements of Vertical Electrical Sounding (VES) have been carried out with 33 sounding points to identify the geometry of aquifers at the ITERA campus. Sounding technique with Schlumberger configuration is applied to collect the data. Since the target of this study is aquifers with variations of depth from surface up to more than 100 meters beneath the surface therefor the length of the line measurement was made varied, the minimum and maximum of AB / 2 are 2 and 150 meters respectively. The changes of MN / 2 are carried out three (3) times (0.5, 2 and 10 meters). The results of processing Vertical Electrical Sounding (VES) data were correlated with secondary data in the form of electrical well data logging resistivity and Spontanous Potential (SP). Based on the results of Vertical Electrical Sounding (VES) data processing correlated with electrical well logging data on resistivity and Spontanous Potential (SP), the ITERA campus area has the potential of unconfined aquifers and confined aquifers. Unconfined aquifers are thought to be tuff with a high resistivity value (> 80 Ωm) which are found at shallow depths (<5 meters above the surface). The confined aquifer is thought to be tuffaceous sandstone with an intermediate resistivity value (20 - 80 Ωm) found at deep depth (> 75 m from the surface).Keyword: Aquifer, VES, Electrical Logging, ITERA
VARIASI KOMPOSISI DINDING CANGKANG FORAMINIFERA BENTONIK KECIL RESEN PERAIRAN SEMARANG (LEMBAR 1409), JAWA TENGAH -, Lia Jurnaliah
Bulletin of Scientific Contribution Vol 11, No 1 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (550.627 KB) | DOI: 10.24198/bsc.v11i1.8284

Abstract

Foraminifera is a unicellular animal which has capability to form a test. Twenty samples of seafloor sediment Semarang waters are analyzed by using quantitative method. Every type of small benthic foraminifera test wall is counted. Based on foraminifera test wall analysis, there are 3 types of test wall: hyaline calcareous, porcelain calcareous, and agglutinin. The highest percentage of hyaline test is found in 24 meter, porcelain test is found in 37 meter, and agglutinin test is found in 51 meter. Hyaline test wall has the highest total individual, 140226 individual (59,45%). It shows that research area is shelf environment. 
PENGARUH PARAMETER SEMENTASI M PADA PERHITUNGAN SATURASI AIR PADA RESERVOIR BATUGAMPING Natasia, Nanda; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 16, No 1 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (367.189 KB)

Abstract

Penelitian ini melakukan perbandingan perhitungan nilai saturasi air formasi dengan berbagai metode untuk melihat seberapa besar perbedaan hasil dari masing masing metode tersebut . Keanekaragaman tipe porositas pada batugamping menjadi tantangan yang besar saat melakukan evaluasi terhadap batuan karbonat, khususnya batugamping. Batugamping adalah batuan sedimen yang utamanya tersusun oleh kalsium karbonat (CaCO3) yang dapat terjadi secara organik, mekanik, maupun kimiawi. Sumber utama yang membentuk batuanini adalah sisa dari organisme laut yang memiliki cangkan karbonat dan diendapkan dalam bentuk batuan. karena sifat pembentukannya ini maka batuan yang dihasikan akan memiliki tingkat heterogenitas yang tinggi, terutama pada porositasnya. Porositas yang dihasilkan akan dapat berupa rongga asal dari cangkang biota, hasil pelarutan cangkang, maupun porositas hasil peretakan. Parameter pada persamaan Archie yang menggambarkan s ist im porositas adalah “m exponent”. Perhitungan kejenuhan air (Sw) yang dilakukan pada data bawah permukaan merupakan tahapan yang sangat penting pada saat evaluasi suatu formasi. Perhitungan ini akan sangat mempengaruhi seberapa besar cadangan hidrokarbon yang dapat diperkirakan. Sedikit kesalahan dalam perhitungan nilai tersebut akan mempengaruhi besaran cadangan suatu lapangan. Pada daerah dengan nilai porositas kecil, perhitungan saturasi perlu mendapatkan perhatian yang lebih karena simpangan nilai saturasi akan semakin besar. terlihat perbedaan hingga maksimum 0.35 pada porositas yang sangat kecil. perbedaan ini sangat signifikan pada perhitungan cadangan suatu lapangan.Kata kunci: batugamping, evaluasi formasi, exponen m, archie, saturasi air
KARAKTERISTIK MORFOMETRI DAS CIKAPUNDUNG HULU, KABUPATEN BANDUNG, JAWA BARAT -, Agung Mulyo
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 (1215.201 KB) | DOI: 10.24198/bsc.v8i3.8251

Abstract

Upstream watershed Cikapundung or known by the name of Lembang Basin, including the Regency Bandung, West Java. In general, the rock consists of five units (Plistosen Down - Holocene), the Breccia Unit Volcano (Formation Cikapundung), Old Volcano Deposition Unit, tuff unit (Formation Cibeureum), Sandy Tuff Unit (Cikidang Formation) and colluvium. Lembang normal faults trending east-west which is a major fault structure which limits the rate of soil water retention from the Upper Basin watershed Cikapundung Bandung below it. Land classification is characterized by a mixture of rural land in the area of agriculture and plantation, until the presence of centers planned settlements (real estate). Broad watershed is 80.475 km2, around 51.575 kms and the degree of roundness (Rc) = 0.380. Tributaries of the river hierarchy order 1 = 449 types, the order of 2 = 89, the order of 3 = 23, order 4 = 7, the order of 5 = 3 and order 6 = 1 types. Different numbers of streams with stream order 1 and order 2 is very large, causing Rb values of order 1 to 2 becomes large is 5.04. In addition there is a small Rb between orders 4 and 5 is 2.33. Thus, the influence of valley pond clear fault control morphometry study area. Elevation upstream and downstream (estuary) river is generally inversely proportional to the level-order tributaries. Elevation difference between upstream and downstream of all the rivers are relatively the same order. Basin wide average is consistently proportional to the level of orders the river, while the. tributaries frequency (F) is inversely proportional. Kc and the Rc value is below 1, this 
PENGEMBANGAN KAWASAN PERMUKIMAN DAN KAWASAN INDUSTRI BERDASARKAN KEMAMPUAN LAHAN SERTA FASIES VULKANIK KUARTER Suganda, Bombom Rachmat; Hutabarat, Johanes; Sulaksana, Nana; Hendarmawan, Hendarmawan
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 (665.921 KB)

Abstract

AbstrakGunung Gede Pangrango dan Gunung Salak merupakan gunung api strato  yang terdapat di Sukabumi Bogor merupakan daerah yang subur sehingga kawasan budidaya pertanian yang sangat subur beralih fungsi menjadi kawasan budidaya permukiman serta industri. Karakteristik batuan, kemiringan lereng, bahaya geologi, potensi air tanah, tekstur tanah, drainase, kepekaan tanah terhadap erosi dan curah hujan merupakan suatu hal yang sangat penting dalam penentuan kesesuaian lahan yang akan mengatur tata guna lahan.  pemanfaatan lahan sebagai kawasan budidaya sehingga harus diatur pemanfaatan lahannya sehingga tidak membahayakan bagi manusia serta menjaga keseimbangan alam. Gunung Salak daerah resapan terletak pada fasies medial dengan elevasi 600-900 meter di atas permukaan laut dan pada lereng Gunung Pangrango daerah resapan terletak pada fasies proksimal dengan elevasi 2058-21227 meter di atas permukaan laut.Kesesuaian lahan pada daerah lereng gunung api vulkanik di daerah penelitian meliputi wilayah limitasi di sekitar fasies sentral dan proksimal, kemudian wilayah  kendala di sekitar ujung akhir fasies proksimal kemudian wilayah limitasi pada fasies medial serta pada ujung akhir medial merupakan wilayah kendala  dan  wilayah kemungkinan di sekitar fasies distal. Kata Kunci :  gunungapi, pengembangan kawasan, kemampuan lahanabstract Cicurug area and Caringin located on the border of Sukabumi and Bogor in West Java. It is a part Mount Salak and Pangrango’s slopes, which is a volcano quarter a certainly fertile area for farming area. The very fertile farming area is then converted into residential and industrial area. Analysis of land capability in the form of rock characteristics, slope, geological hazards, water potential, soil texture, drainage, soil sensitivity to erosion and rainfall are very important in determining the suitability of land that would manage land use. Factors of natural hazards as well as water catchment areas is a limiting factor for land use as cultivated area that should be regulated so that the land use is not harmful to people as well as maintaining the balance of nature. Catchment areas in the region shows the slopes of Mount Salak catchment area lies in the medial facies with elevation of 600-900 meters above sea level and on the slopes of Mount Pangrango catchment areas located in the proximal facies with 2058-21227 meters elevation mean sea level.Key word : volcano, Area Development, Land capability
TEKTONIK DAERAH MUARA TEBO PROPINSI JAMBI -, Iyan Haryanto; -, Ismawan; -, Faisal Helmi; -, Edy Sunardi; -, Oeke Sobarin; Indah Putri, Yunita Rossa
Bulletin of Scientific Contribution Vol 6, No 1 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (740.404 KB) | DOI: 10.24198/bsc.v6i1.8157

Abstract

Geological structure of Muara Tebo area was influenced by subduction between Eurasian and India-Australian Plates. Regional tectonic of this area dominantly yield an amount of fault structure with orientation Northwest-Southeast.Structural pattern of study area dominated by dextral strike-slip and thrust fault, with orientation Northwest-Southeast. The dextral strike-slip fault represent the first structure formed (Early Tertiary) which influenced by transtensional stress. Further, on Neogene Tectonic period the structures influenced by tranversional stress system which affecting inversion. This late tectonic yield an amount of thrust fault.
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
PEMANTAUAN ALIRAN SEDIMEN MELAYANG SUB-SUB DAS DI CITARUM HULU DALAM KAITANNYA DENGAN UMUR OPERASIONAL WADUK SAGULING -, Edi Tri Haryanto
Bulletin of Scientific Contribution Vol 4, No 2 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (406.609 KB) | DOI: 10.24198/bsc.v4i2.8121

Abstract

Monitoring suspended load transport flowing in to Saguling Reservoir has been conducted from August 2005 to January 2006 by means of measurements : water level, discharge, and suspensions of Upper Citarum River at Station Nanjung and its main tributaries at six other stations: Cikapundung, Cikeruh, Citarik, Cirasea, Cisangkuy, and Ciwidey River. Discharge and sediment suspension rating curve was made than compared with which measured and analyzed by the Institute of Ecology Padjadjaran University in 1982 and that also reported by Dewanti 1983. The results indicated that trend of sediment suspension transports was not significantly difference between that in 1982, although since 1992, total sediment depositions in the reservoir was slightly increase above deposition plan (4 million m3 per year). During the last seventy half years, the total deposition sediment was 67,832,078 m3, the life storage capacity was 167,689,000 m3. By using the assumptions of steady rate of deposition in the reservoir, the remaining operational age of Saguling reservoir was 25 years. The conclusions is that the life time of Saguling Reservoir for electric power generation still in plan. To halt worsening conditions of erosion rate in the Upper Citarum Watershed and sediment transport pattern in to the Saguling reservoir, integrated planning of watershed management system should be taken in to account..
EVOLUSI TEKTONIK BERDASARKAN ANALISIS DATA KEKAR DAERAH BINUANG DAN SEKITARNYA, KECAMATAN BINUANG, KABUPATEN TAPIN, PROVINSI KALIMANTAN SELATAN Yusuf, Andi Supian; -, Ismawan; Helmi, Faisal
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v12i3.8376

Abstract

Research area administratively located in Binuang district, Tapin Regencies, South Kalimantan Province. Geographically located in coordinate 115° 3' 40,359" East Longitude until 115° 15' 49,871" East Longitude and 3° 1' 7,068" South Latitude 3° 16' 10,038" South Latitude. Based on its physiography aspect, the research area is part of Barito Basin. The object of these research area the geological structures which is focused on the measurement of the fractures on rocks which represents each present tectonic periods, which is used for determining force and the tectonic pattern in the research area. As seen from the field data, it is known that the geological structures available in the research area are anticline, sincline, fracture, sinistral wrench fault, and reverse fault. The tectonic evolution on the research area begins during rifting which continues since Pra-tersier until Eosen with NE-SW direction, resulting the reverse faults with the fault surface estimated to be NW-SE direction, during Pliosen period reactivation of older faults happened on research area. The tectonic process changed into compression with NW-SE direction.

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