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Bulletin of Scientific Contribution : Geology

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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 419 Documents

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METODE KUANTITATIF FORAMINIFERA KECIL DALAM PENENTUAN LINGKUNGAN Jurnaliah, Lia; Winantris, .; Fauzielly, Lili
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKForaminifera adalah hewan uniseluler yang dapat berperan sebagai indikator lingkungan. Metode kuantitatif foraminifera merupakan salah satu cara dalam penentuan lingkungan, diantaranya adalah rasio foraminifera plangtonik dan bentonik (rasio P/B), Triangular plot Murray dan Indeks αFisher. Berdasarkan studi pustaka dan ulasan yang dilakukan terhadap ketiga metode tersebut dapat disimpulkan bahwa metode rasio P/B dapat digunakan dalam penentuan lingkungan laut dangkal dan laut dalam, tetapi tidak dapat digunakan untuk menentukan karakteristik ekologi dari lingkungannya. Sementara itu, Metode Triangular Plot Murray dan Indeks α Fisher dapat digunakan hanya terbatas pada penentuan lingkungan laut dangkal, tetapi dapat digunakan untuk menentukan karakteristik ekologi lingkungannnya. Kata Kunci: Foraminifera, rasio P/B, Triangular Plot Murray, Indeks α Fisher, lingkungan. ABSTRACTForaminifera is a unicellular animal can act as indicators of the environment. Quantitative methods foraminifera is one way in the determination of the environment, such as ratio of planktonic and benthonic foraminifera ratio (P/B ratio), triangular plot murray and the index α.Fisher. Based on the literature reviews of the third methods, it can be concluded that the ratio of P/B methods can be used in the determination of shallow marine and deep marine environment, but cannot be used to determine the characteristics ecology of its environment. On the other hand, method of Triangular Plot Murray and the index α Fisher can be used is limited to the determination of the shallow marine environments, but can be used to determine the characteristics ecology of its environment. Keywords: Foraminifera, ratio P/B, triangular plot murray, index α fisher, environment

DIAGENESIS DAN BATUAN SUMBER BATUPASIR FORMASI LATI DI DAERAH BERAU, KALIMANTAN TIMUR, BERDASARKAN DATA PETROGRAFI -, Sigit Maryanto
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Petrography analysis result of twenty two sandstones of the Lati Formation were taken from Berau area, East Kalimantan showing that these rocks classified as litharenite, feldspathic litharenite, sublitharenite, feldspathic wacke, and lithic wacke witch are partially calcareous. Diagenetic processes visible on the petrographic analysis including as replacement, dolomitization, cementation, and compaction. Plotting result on the triangular diagrams showing that the provenance of the sandstones are dominated by granitic rocks initiated from tectonic setting of rifted continental margin and they have transported toward south-east.

AKTIVITAS TANAH LAPUKAN BREKSI VULKANIK DAN IMPLIKASINYA TERHADAP KEKUATAN FONDASI DI JATINANGOR -, Irvan Sophian; -, Zufialdi Zakaria; -, Yuyun Yuniardi
Bulletin of Scientific Contribution Vol 5, No 1 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Jatinangor require public facility. The facility need strength of soil bearing capacity for stable foundation in occupying each soil mass. Soil type in this area is CH ( clay of high plasticity) and MH (silt of high plasticity). Based on diagram of Cassagrande, area research reside between U-line and A-line, and soil type generally is CH, clay high plasticity.At soil which have medium-high activity, allowable soil bearing capacitry ( qa) for continuous foundation is between 31.450 until 52.884 T/m2. Soil bearing capacity ( qa) with activity number (A) show negative relationship ( R - 0.804058). Increasing soil activity caused decreasing soil baring capacity.Instruction of Environmental Monitoring Plas is done especially monitoring at condition of house building and also other medium building like drainage channel and bridge etcetera. Environmental monitoring is required as effort to anticipate damages of arising out effect of negative impact. Small damage is properly attention or improve repaired before becoming is big.

POTENSI HIDROKARBON FORMASI AIR BENAKAT, LAPANGAN ‘CA’, CEKUNGAN SUMATERA SELATAN Prawoto, Adycipta Anis; Firmansyah, Yusi; -, Nurdrajat; Sunardi, Edy
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Field ‘CA’ located in the South Sumatra Basin with an area of 6433 Km2. This study aimed to evaluate the hydrocarbon potential of Air Benakat Formation. Based on the results of the petrophysical analysis from well HA, BA, PA, RI and SE show the results are : Vsh cut off 0.34, Phie cut off 0.136 and SW cut off 0.59. Determination of reservoir netpay performed on HA well, that have thick of netpay 14.638 meters. The results of picking seismic horizon are time and depth structure maps of Air Benakat Formation and Gumai Formation. The map was made for determining lead in the research area. Calculation of estimated hydrocarbon reserves in the research area shows the value of OOIP is 345 MMBO.

STRATIGRAFI VULKANIK DI LERENG UTARA GUNUNG TANGKUBAN PARAHU, DAERAH CISALAK, KABUPATEN SUBANG, PROVINSI JAWA BARAT Yuniardi, Yuyun; Hendarmawan, .; Isnaniawardhani, Vijaya; Abdurrokhim, .; Ridwan, Panji
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

AbstrakGunung Tangkuban Parahu adalah gunung api aktif di Provinsi Jawa Barat yang merupakan fase termuda dari kelanjutan sistem vulkanisme Sunda-Tangkuban Parahu yang memiliki sejarah geologi yang cukup rumit dan komplek, khususnya daerah Cisalak dan sekitarnaya, Kabupaten Subang. Metode Fasies Gunungapi dapat digunakan untuk merekonstruksi peristiwa erupsi yang terjadi masa lampau dan juga dapat digunakan untuk memprediksi arah aliran apabila terjadi erupsi berikutnya. Stratigrafi vulkanik daerah penelitian dapat dibagi menjadi enam satuan yang diurutkan dari muda ke tua, yaitu: Aliran Piroklastik 1 Bukittunggul (Ba1) Holosen; Jatuhan Piroklastik Tangkuban Parahu (Tj) Holosen; Aliran Piroklastik Tangkuban Parahu (Ta) Holosen; Aliran Piroklastik 2 Bukittunggul (Ba2) Plistosen awal; Aliran Lava Bukittunggul (Bl) Plistosen awal; dan Aliran Lava Sunda (Sl) Plistosen tengah. Setelah dilakukan analisis fasies diperoleh fasies dengan endapan paling muda yang memiliki material berupa konglomerat dan fasies debris flow, pada fase selanjutnya didapatkan fasies endapan jatuhan piroklastik, kemudian dilanjutkan dengan fasies aliran prioklastik atau ignimbrit, dan fasies berikutnya adalah berupa block dan ash deposit, serta fasies terakhir dengan meterial tertua yang berlitologikan lava adalah fasies lava koheren. Dampak erupsi berupa aliran lahar, awan panas, dan material jatuhan yang terjadi di masa lalu masih sangat mungkin terjadi pada masa yang akan datang. Katakunci: Tangkuban Parahu, Fasies Gunungapi, Erupsi. AbstractTangkuban Parahu Volcano is an active volcano in West Java Province which is the youngest phase of the continuation of the Sunda-Tangkuban Parahu volcanism system which has a fairly complex and complex geological history, especially the Cisalak and surrounding areas, Subang Regency. The Volcanic Facies Method can be used to reconstruct eruption events that have occurred in the past and can also be used to predict the direction of flow when the next eruption occurs. The volcanic stratigraphy of the study area can be divided into six units which are sorted from young to old, namely: Pyroclastic Flow 1 Bukittunggul (Ba1) Holocene; Holocene Tangkuban Parahu (Tj) Pyroclastic Fall; Pyroclastic Flow Tangkuban Parahu (Ta) Holocene; Bukittunggul 2 Pyroclastic Flow (Ba2) Early Plistocene; Bukittunggul Lava Flow (Bl) Early Plistocene; and Sunda Lava Flow (SL) Middle Plistocene. After facies analysis, facies was obtained with the youngest sediment which had material in the form of conglomerates and debris flow facies, in the next phase obtained facies of pyroclastic fall deposits, then proceed with prioclastic flow facies or ignimbrite, and the next facies were blocks and ash deposits, and facies the last with the oldest meterial lava is the coherent lava facies. The impact of the eruption in the form of lava flow, hot clouds, and falling material that occurred in the past is still very likely to occur in the future. Keywords: Tangkuban Parahu, Volcano Facies, Eruption.

KARAKTERISTIK ALIRAN SUNGAI SERANG BAGIAN HILIR, PANTAI GLAGAH, KECAMATAN TEMON, KABUPATEN KULON PROGO, DIY -, Edi Tri Haryanto
Bulletin of Scientific Contribution Vol 11, No 3 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Glagah beach is a turists area of beach and lagoon on the west and the iron sand mining area on the east of Serang river embouchure in Temon Sub-District, KulonProgo District of Yogyakarta Province. Information of Serang River flow characteristics, which are also influenced by the tide of sea water would be useful for the planning of the iron sand mining, especially the impact on groundwater behavior and the management of the lagoon in relation with the estuary. The study of water flow characteristics of Serang River downstream affected by tidal sea levels have been carried out by measuring water level (TMA) in three site location, three times twenty-four hours, as well as measurements of river discharge at two points. Hydrograph analysis was then performed and the analysis of the correlation between the water level (TMA) and the river discharges. The maximum and minimum daily fluctuations occur twice a day with a three-hour span between the maximum and minimum, ie at 00.00/ 12.00 a.m or 02.00 a.m, at 12.00 p.m or at 14:0 p.m, while the minimum occurs at 06.00 a.m or 08.00 a.m and at 18:00 p.m or 20:00 p.m. The effect of sea level fluctuations on the Serang River flow is about 11.3 Km away from the estuary. Based on the result of measurement and analysis, Serang river discharge are 4 m3 per second at the upstream location (4.5 km), and 4.5 m3/second (1.3 km) from the estuary..

Geomorfologi dan Ciri Fasies Vulkanik Pada Sungai Cihideung dan Ciparikalih, Sub Das Cibadak, Gunung Salak, Jawa Barat Natasia, Nanda; Mardiana, Undang; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTSalak Mount is a volcanic complex located in the south of Jakarta. This mountain area is included in the area of Sukabumi Regency and Bogor Regency, West Java. The peak part is a forest area whose management of the forest area was originally under the Perhutani Public Corporation Forest Management Unit (KPH) Bogor, but since 2003 it has been an expansion area of the Gunung Halimun National Park, and is managed as Gunung Halimun-Salak National Park. This research begins with the analysis of topographic maps to determine the geomorphological characteristics of the study area. These geomorphological characteristics include river flow patterns, land use and slope. At this stage it can be distinguished as many as nine recognizable geomorphological units. The next stage is field observation to find out the surface geological conditions of the study area. at this stage two stratigraphic cross sections were made which passed the Cihideung and Ciparikalih. From the results of geomorphological analysis, the research area can be divided into nine geomorphological units which are compiled based on their morphographic, morphometric and morphogenetic characteristics. Two stratigraphic cross sections through the Cihideung River and Ciparikalih River trajectories are made based on field observations with a measured section method. In both trajectories, there are six volcanic facies that make up the research area.. Keywords: Salak Mount, Cibadak Sub Das, Volcanic Facies, Geomorphology ABSTRACKGunung Salak merupakan kompleks gunung berapi yang terletak di selatan Jakarta. Kawasan rangkaian gunung ini termasuk ke dalam wilayah Kabupaten Sukabumi dan Kabupaten Bogor, Jawa Barat. Bagian puncaknya merupakan kawasan hutan yang pengelolaan kawasan hutannya semula berada di bawah Perum Perhutani Kesatuan Pemangkuan Hutan (KPH) Bogor, tetapi sejak 2003 menjadi wilayah perluasan Taman Nasional Gunung Halimun, dan dikelola sebagai Taman Nasional Gunung Halimun-Salak. Penelitian ini diawali dengan analisis peta topografi untuk mengetahui ciri geomorfologi daerah penelitian. Ciri ciri geomorfologi tersebut diantarana pola pengaliran sungai, tata guna lahan, serta kemiringan lereng. Pada tahapan ini dapat dibedakan sebanyak sembilan satuan geomorfologi yang dapat dikenali. Tahapan selanjutnya adalah pengamatan lapangan untuk menetahui kondisi geologi permukaan daerah penelitian. pada tahapan ini dibuat dua buah penampang stratigrafi yang melewati sub Das Cihideung dan sub DAS Ciparikalih. Dari hasil analisis geomorfologi, daerah penelitian dapat dibagi menjadi sembilan satuan geomorfologi yang disusun berdasarkan ciri morfografi, morfometri dan morfogenetiknya. Dua buah penampang stratigrafi melalui lintasan Sungai Cihideung dan Sungai Ciparikalih dibuat berdasarkan pengamatan lapangan dengan metoda penampang terukur. Pada kedua lintasan tersebut dapat diketahui enam fasies vulkanik yang menyusun daerah penelitian. Kata Kunci: Gunung Salak, Sub Das Cibadak, Fasies Vulkanik, Geomorfologi.

IDENTIFIKASI DAN MITIGASI PADA ZONA RAWAN GEMPA BUMI DI JAWA BARAT -, Zufialdi Zakaria; -, Ismawan; -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 9, No 1 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Java Island is a region of frequent earthquakes with varying strength. Most of destructive earthquakes measuring over 5.6 on the Richter Scale, as a shallow earthquake with a depth of less than 30 KM. On land, the earthquake can damage a variety of infrastructure and endanger lives. At ocean, earthquakes tend to be a potential tsunami. The tsunami that ever happens is in the south of Pangandaran beach on July 27, 2006. To reduce the impact of the earthquake disaster, the identification and mitigation is required. In the identification of the earthquake in the mainland, the earthquake potential of fault-lines are shown on a large faults, there are: Earthquake's Row of Zone Bayah, Earthquake Row of Baribis Zone, Earthquake Row of Cimandiri Zone, Earthquake Row of Lembang Zone, Earthquake Row of Citanduy Zone. On the identification of the earthquake in the ocean, is required analysis to see the condition of the epicenter in the southern Teluk Pelabuhan Ratu. Mitigation of earthquake disaster can be done, among others through the various activities that need to be socialized, assisted by experts from various disciplines.

ANALISIS FASIES RESERVOIR A FORMASI MENGGALA DI LAPANGAN BARUMUN TENGAH, CEKUNGAN SUMATRA TENGAH Natasia, Nanda; Syafri, Ildrem; Alfadli, Muhammad Kurniawan; Arfiansyah, Kurnia
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKLapangan Barumun Tengah adalah lapangan yang baru dikembangkan semenjak ditemukannya potensi hidrokarbon pada sumur eksplorasi BT-1 pada lapisan batupasir A dan B tahun 1984. Pengambilan data baru berupa sumur pengembangan dan seismik 3D dapat digunakan untuk melihat pola sebaran lateral dan geometri batupasir yang sesuai dengan model lingkungan pengendapan yang diajukan, sehingga diperlukan studi lebih lanjut untuk memahami tipe fasies, distribusi lateral, geometri dan kualitas reservoir pada reservoir batupasir A. Kelompok Sihapas berumur Awal Miosen menindih tidakselaras terhadap Formasi Pematang. Formasi ini mengandung batupasir dengan ukuran butir medium-coarse dan batulempung yang diendapkan pada delta plain- delta front. Ketebalan pada Formasi Lower Sihapas di sumur BT-1 adalah 130 kaki dan terdapat 4 batupasir individu berukuran 40kaki, 8kaki, 30kaki, dan 10kaki masing-masing. Sedangkan pada sumur BT-2 ketebalan Lower Sihapas 150kaki dengan 4 batupasir individu juga masing-masing 53kaki, 23kaki, 5kaki, 22kaki. Berdasarkan deskripsi litofasies, maka dapat diinterpretasikan asosiasi fasies yang terdapat pada sumur BT-3 terdiri dari dua asosiasi fasies (genetic unit). Kata kunci: Fasies,Formasi Menggala, Sumatera Tengah ABSTRACTBarumun Tengah is one of newly developed field since the discovery of hidrocarbon potential in BT-1 Well on Sand A and B in 1984. Newly well and seismic data taken was able to determinate the geometry and lateral distribution of the sand facies. But the new integrated study to understand the facies type is needed. The Early Miocene Sihapas group was deposited unconformitely the Older Pematang Group, Consist of medium to coarse sandstone and shale deposited in delta plain to delta front environment. Thickness of the sand in BT-1 sand is aproximately 130 ft in total with 4 separated sandstone layer, from bottom to top 40ft, 8 ft, 30ft, and 10ft. while thickness in BT-2 Well 53ft, 23ft, 5ft, and 22ft respectively. Based on litofacies description, there are two genetic unit can be found. Keyword: Facies, Menggala Formation, Central Sumatera

PETROLOGY OF HIGH PRESSURE METAMORPHIC ROCKS FROM LUK ULO MELANGE COMPLEX, KARANGSAMBUNG, CENTRAL JAVA-INDONESIA -, Aton Patonah; -, Haryadi; -, Bambang Priadi
Bulletin of Scientific Contribution Vol 7, No 1 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Luk Ulo Melange Complex is situated in Central Java, this complex is characterized by the occurrence of Tertiary and Pre-Tertiary rocks as fragments embedded in sheared clay matrix. The fragments consist of ophiolite, metamorphic, chert and carbonate rocks. This research is focused to high pressure metamorphic rock which is represented by glaucophane schist. The rocks consists of albite, augite and ferroaugite, Mg – cataphorite, glaucophane, ferrian and crossite, almandine spesartine, quartz; and rarely can be observed lawsonite, hornblende, tremolite and actinolite. The latter mineral assemblage indicates that the rock was formed at 580oC - 500oC and 14,5 - 4 kbar. Temperature and pressure obtained from glaucophane schist indicated that the rock came from the lower interval of the subduction environment and the possibility have already been in retrograde stage. This is showed by recrystallization of amphibole-glaucophane to sericite or chlorite, and chlorite after garnet. This may represent the retrograde stage in lower temperature-pressure conditions. This data explains the accretion and exhumation history of high pressure metamorphic rocks from subduction depth to the surface condition.

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