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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 413 Documents

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PETROLOGI AMFIBOLIT KOMPLEK MELANGE CILETUH, SUKABUMI, JAWABARAT -, Aton Patonah; -, Haryadi Permana
Bulletin of Scientific Contribution Vol 8, No 2 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Amphibolite is part of Ciletuh mélange complex that was exposed together with serpentinite, harzburgite, dunite, gabro and basalt. The rock is dominated by amphibole and andesine and rarely can be observed quartz. At some locations, the rocks have changed to ampbibolite epidote (oligoclase + hornblende + actinolite + epidote + chlorite). The result of mineral paragenesis and measurement of pressure and temperature indicates that amphibolites was formed of 5 kbar – 6 kbar with temperature 640oC – 660oC. Meanwhile amphibolites epidote was formed of 4 kbar – 5 kbar with temperature 410oC – 455oC. Obtaining pressure and temperature from amphibolites is indicated as result of obduction and then it has retrograded metamorphism to amphibolites epidote because of accretion and uplifting at Upper Oligosen. The indication is characterized by actinolite changed to chlorite, albite and epidote have replaced andesine, and another indication is the rim of hornblende is replaced by actinolite.

Characteristic of volcanic deposits in the southern part of Gunung Karang, Pandeglang - West Java Abdurrokhim, Abdurrokhim; Ismawan, Ismawan
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 | DOI: 10.24198/bsc.v14i3.11055

In the southern part slope of Gunung Karang in Pandeglang, there are many well-outcrops of volcanic materials that developed during Quaternary. The deposits represent various lithofacies both vertically and laterally.In general the lithologic characteristics that are found in the study area can be grouped into three units, (1). Tertiary sedimentary rock, which is consists of tuffaceous mudstones interbedded with fine-grained tuffaceous sandstone and siltstone, (2) primary volcanic product consist of andesite lava flow, volcanic breccia/agglomerate, and pyroclastic rocks (ash tuff, lapilli tuff, bomb/block, and lapilli tuff breccia, and (3) secondary volcanic products, which is consisting of laharic breccia and coarse-grained thick-bedded sandstone.In general the deposits become younger to the top of topography (Gunung Karang), but locally the deposits are most likely overlapping each other’s.Keywords: Volcanic deposits, Gunung Karang

INVENTARISASI BAHAN TAMBANG DI WILAYAH CIBADAK, CIEMAS DAN CISAAT, KABUPATEN SUKABUMI -, M. Sapari D. Hadian; -, Cipta Edyana
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Nowaday natural resources have to be optimalized for humanitarian welfare, It needed manajemen of mining effort that have the same with characterization of each natural resourses, then it needed to take inventory of appearance of natural resources itself. All the information of mineral deposits be fitured in Map that covered in Identification and Mapping Potential Mineral Resourses Work.South Mountained Zone is a Table Land which developed a triangle with its top at southern Bandung have direction west to east, from The Pelabuhan Ratu Bay until Nusakambangan. Width of South Mountained Zone is about 50km. This zone is divided into 3 subzones, which is Jampang Subzone, Pangalengan Subzone, and Karangnunggal Subzone. The research area is included in Jampang subzone that contain Pra-tertiary Rock and Tertiary Sediment and appears in western of this zone. The Oldest rock found at South Mountained Block West Java consist igneous rock, ultrabase, and basalt (Van Bemmelen, 1949) and Skish which appears in Pra-tertiary age (Mark, 1957). Endang Toyib (1975) comment that complex melange deposits which is consist in Ciletuh area are the oldest rock (Mps, Mgg, Mgp). Those rocks formed by ofiolith and metamorphic rock and sedimentary rock consist black clay that scraped and mixed tectonically.

PERHITUNGAN POTENSI AIRTANAH DI KAWASAN KAMPUS UNPAD JATINANGOR DENGAN METODE NUMERIK Barkah, M. Nursiyam; Setiadi, Djajang Jedi; Hadian, Moh. Sapari Dwi
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Geological conditions Jatinangor campus is a volcanic deposits that have 3 potential aquifer, the unconfined aquifer is a depth of 0-60 m, confined aquifer 1 at a depth of 80-90 m and confined aquifer 2 at a depth of 120-200 m. The results of groundwater potential calculation is done using the method of numerical groundwater flow pattern is obtained relative trending Northwest - Southeast tend to follow topographical pattern. This is consistent with the geological-geophysical mapping data that the geometry and pattern of shallow groundwater aquifers configuration follows the pattern of topographic contours. However, the groundwater in the aquifer geometry and pattern configuration does unfollow the pattern of topographic contours, but follows the pattern of the stratigraphy and structural geology. The quality of groundwater in the shallow aquifer or aquifer in not affected by topography, groundwater quality is controlled by the pattern of stratigraphic and structural geology. Ground water Chemical typehas results are Ca-HCO3; Mg ; Mg-HCO3 and No-type. The results of measurements of physical character in the field, existing groundwater generally meet the requirements of the quality standards for drinking water. The test results of the pumping test wells 10 point values obtained transmissivity (T) ranged from 86.4 to 467.9 m2 / day and Permeability (K) ranging between 1.2 x 10-4 - 6.3 x 10-6 cm / sec. Based on the well test results obtained transmissivity values diversity and rock permeability significantly, it could be interpreted that the distribution of the research areas of uneven rocks.

PETROGRAFI BATUAN BEKU VOLKANIK BAWAH LAUT KOMPLEKS GUNUNG KOMBA, LAUT FLORES, INDONESIA -, Johanes Hutabarat; -, Agus Didit Haryanto; -, L. Sarmili
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This study focuses on the petrography characteristics of the volcanic rocks in Mount Komba, Flores Sea, Nusa Tenggara Timur.Based on textural and mineralogical characteristics, volcanic rocks Mount Komba are composed of andesite-basaltic lava flows. It is chiefly porphyritic, intergranular, intersertal to glomeroporphyritic clots textures that contains variable proportion of plagioclase, pyroxene, biotite, hornblende and opaque oxide minerals phenocryst in very fine grained groundmass contains clinopyroxene, plagopclase laths, devitrified glass and opaque oxide minerals. Plagioclase phenocrysts show sieve-textured cores, opaque inclusions, compositional zoning, and skeletal melt pockets. Pyroxenes are strong zones with rims. Some are poikilitic. Biotite commonly exhibits a deep russet color parallel to its slow ray, the perpendicular direction being light to medium yellow brown. Some are altered to an asseblage of chlorite and finely granular opaque oxide minerals. Hornblende is perhaps slightly less abundant than biotite and occurs typically in euhedral to subhedralo crystals. It is pleochroic in shade of olive green and brownish yellow, rarely exhibiting a bright apple-green shade. Among the accessory minerals, opaque oxide minerals occurs as euhedral wedge-shape or blocky to slightly rounded, broken grains are common and also as a fine grainded alteration product associated with chlorite, formed from biotite and hornblende. Fresh glass is present, though in most cases the glass is devitrified.Some Mount Komba volcanic rocks studied exhibit varying degrees of propylitic or sericitic alteration. Feldspars plagioclase in particular, in most of the intensely hydrothermally altered Mount Komba volcanic rocks have been replaced by fine grained sericite, clay minerals, carbonate, chlorite, epidote and opaque oxide minerals.

KARAKTERISTIK GEOLOGI DAERAH VOLKANIK KUARTER KAKI TENGGARA GUNUNG SALAK Suganda, Bombom Rahmat; Isnaniawardhani, Vijaya
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 | DOI: 10.24198/bsc.v12i2.8370

Gunung Salak land forms hills and valleys, composed of typical volcanic deposit that controlled by geology structures. The research was conducted in several stages, there are: references study, field study or geological mapping (observation of geomorphology or landforms, rock type and genesis, geology structure indication) as well as data analysis. Landform of southeast part of Gunung Salak can be devided into steep hill geomorphological unit that lied on high land, formed by Salak volcanic deposits, with radial drainage pattern; and sloping hill geomorphology unit with smooth contours that lied on lowland, formed by Salak and Pangrango mixing volcanic deposits. The southeast part of Gunung Salak foothills from lower to upper consecutively composed by pumiceous tuf volcanic deposit; laharic breccia; lapili and pumiceous tuf with paleosoil layer intercalations; and andesitic lava. Geology structure indications was difficulty observed because of thin soil cover and sloping dip of rock layer (<10º).

Karakteristik dan Lingkungan Pengendapan Batubara Eosen Formasi Batu Ayau Cekungan Kutei Atas Bagian Barat Di Daerah Murung Raya Dan Sekitarnya, Kalimantan Tengah Suryanegara, Yoga; Wardhani, Vijaya Isnania; Sunardi, Edy
Bulletin of Scientific Contribution Vol 17, No 1 (2019): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Endapan batubara di daerah penelitian termasuk ke dalam Formasi Batu Ayau yang merupakan bagian dari Kelompok Tanjung pada Cekungan Kutei Atas bagian Barat. Diidentifikasi terdapat sebanyak 22 lapisan batubara dimana 4 (empat) lapisan batubara merupakan seam utama yaitu (dari bawah ke atas): seam B (1.05m), C (1.19m), D (1.43m) dan J (1.44m). Deskripsi megaskopis lapisan batubara: berwarna hitam yang didominasi pita terang (bright) – sangat terang (very bright), pecah blocky – concoidal, dan abundant cleat. Berdasarkan analisa maseral, batubara Eosen ini dapat diklasifikasikan sebagai tipe Vitrinite A. Rank batubara di daerah penelitian adalah low – medium volatile bituminous – semi antrasite (Rv: 1.75 – 2.0 dengan VM-daf: 13.78% – 28.14%) dan memiliki kualitas batubara metalurgi dengan CSN 8.5. Fasies sedimen pembawa batubara berupa perselingan fasies batupasir dengan batulanau dengan sisipan lapisan batubara. Fasies batulanau sisipan batubara diinterpretasikan merupakan endapan rawa yang dipengaruhi oleh aktivitas limpas banjir sedangkan fasies batupasir merupakan tipe endapan channel dan point bar. Kedua fasies sedimen ini diendapkan pada lingkungan fresh water atau sistem lingkungan pengendapan fluvial dengan pola meandering dan/atau braided system yang dipengaruhi oleh floodplain. Lingkungan pengendapan ini terbagi menjadi empat siklus sekuen lingkungan pengendapan fluvial. Berdasarkan analisa kualitas conto diketahui bahwa proses coalification batubara secara vertikal dikontrol oleh proses burial depth dan secara lateral dikontrol oleh adanya struktur geologi yang diidentifikasi sebagai bagian akhir dari Adang Flexure serta oleh adanya intrusi batuan beku Sintang yang tidak tersingkap ke permukaan. Kata kunci: Batubara Eosen, Type, Rank, Batubara Metalurgi, Fluvial System, Coalification.

KARAKTERISTIK GEOLOGI DAERAH GUNUNGAN LUMPUR CIUYAH -, Faizal Muhamadsyah; -, Edy Sunardi; -, Vijaya Isnaniawardhani
Bulletin of Scientific Contribution Vol 10, No 2 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The mud flow which identified in Ciuyah area is located in Ciniru village, District Ciniru, Kuningan regency, West Java. Study of morphometry through the deployment of slope classes have described the class as a concentric distribution with location of Ciuyah mud flow in the middle. Annular’s drainage pattern at the regional scale is reflected of the circular in the Ciniru area, at around of site Ciniru extrusion Ciuyah mud mound. Circular patterns of distribution shown by the slope zone, and annular flow patterns in the river a more regional scale is suggest updoming beneath the surface. Interpreted that the migration channel and the possible fluid circulation is controlled by faults that developed in the study area. Structural geology are factors that contribute to the release or migration of fluid to the surface, and provide an outlet for material and fluid under conditions of excessive stress, clayey material which forming of bedrock formations is elusiation experience process, and eventually formed mountains of mud intrusion on the surface

HOST ROCK AND MINERALIZED ORES GEOCHEMISTRY OF BANTARHUNI VEIN, ARINEM DEPOSIT, WEST JAVA – INDONESIA Yuningsih, Euis Tintin
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

There are closed spatial relationship between the different phases, the different metallic minerals, the precious-metals bearing minerals, the volcanic host rock and the plutonic intrusions of the Arinem vein system. Nine samples from Bantarhuni vein including four samples from quartz-sulfide vein from different stages and level, and five samples from altered host rock were analyzed geochemically by Induced Couple Plasma (ICP) and Induced Couple Plasma Mass Spectrometer (ICP-MS) to identified the geochemical characteristics of Bantarhuni vein system. The geochemical data obtained from the quartz-sulfide vein and altered host rock of the Bantarhuni vein is mostly similar to those obtained from Arinem vein samples. Some samples from the alteration zone have contents similar to the less altered Jampang Formation and andesitic Miocene and Pliocene intrusions rocks, with a little depletion and enrichment for some oxides. The abundance of ore and gangue minerals vary among each stage of mineralization of Bantarhuni vein. The REE in the Arinem and Bantarhuni veins considered to have been extracted by water/rock interaction between hydrothermal solution and country rocks. Some REE pattern of the mineralized Bantarhuni vein show irregularly pattern and this is could be due to high content of sulfide minerals in the samples, or due to analytical error during sample dissolution. The gold and silver contents in the Arinem and Bantarhuni veins vary very much and there is relatively low Au and Ag concentrations occur in samples from any alteration zone. There is no correlation found between gold and other major ore elements except for Ag. The highest content of Au is having low ΣREE. Keywords : Bantarhuni vein, Geochemical, quartz-sulfide vein, water-rock interaction. Terdapat hubungan spasial antara fase yang berbeda, mineral logam yang berbeda, mineral yang mengandung logam mulia, batuan induk (host rock) vulkanik dan intrusi plutonik dalam sistem urat Arinem. Sembilan sampel dari urat Bantarhuni yang terdiri dari empat sampel dari urat kuarsa-sulfida dari stages dan kedalaman yang berbeda, dan lima sampel dari host rock yang terubah dianalisis secara geokimia degan Induced Couple Plasma (ICP) dan Induced Couple Plasma Mass Spectrometer (ICP-MS) untuk mengidentifikasi karakteristik geokimia dari sistem urat Bantarhuni. Data analisis geokimia yang diperoleh dari urat kuarsa-sulfida dan batuan induk terubah dari urat Bantarhuni sebagian besar sama dengan yang diperoleh dari sampel urat Arinem. Beberapa sampel dari zona alterasi memiliki kandungan mirip dengan Formasi Jampang yang terubah lemah dan batuan intrusi andesit berumur Miosen dan Pliosen, dicirikan dengan sedikit pengurangan dan pengayaan untuk beberapa oksida. Kelimpahan bijih dan mineral gang bervariasi di dalam setiap tahap mineralisasi di urat Bantarhuni. REE di urat Arinem dan Bantarhuni kemungkinan diekstraksi dengan adanya interaksi air/batuan antara fluida hidrothermal dan batuan sampingnya. Beberapa pola REE dari urat Bantarhuni yang termineralisasi menunjukkan pola yang tidak teratur dan hal ini kemungkinan disebabkan oleh tingginya kandungan mineral sulfida dalam sampel, atau karena kesalahan pada saat analisis dalam pelarutan sampel. Kandungan emas dan perak dalam urat Arinem dan Bantarhuni sangat bervariasi dan konsentrasi Au dan Ag pada sampel dari setiap zona alterasi relatif rendah. Tidak ada korelasi ditemukan antara emas dan unsur bijih utama lainnya kecuali dengan Ag. Sampel dengan kandungan Au tertinggi adalah sampel yang memiliki ΣREE rendah. Kata kunci: Urat Bantarhuni, geokimia, urat kuarsa-sulfida, interaksi air-batuan.

ZONASI DAERAH BAHAYA LONGSOR DI KAWASAN GUNUNG TAMPOMAS KABUPATEN SUMEDANG, JAWA BARAT -, Lucky Lukmantara
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Research area generally have a big slope. Based on Van Zuidam classification (1983), the research area can be divided into 3 angle class or slope: 1) area which have surging hilly morphology with of slope range from 25 - 35 %, 2) area which have precipitous hilly morphology with slope range from 35 - 90 %, and 3) area which have hilly morphology cut sharply or hilly very precipitous with slope 90 – 150 %Area which including into landslide-zone in generally reside at area which have precipitous hilly and surging hilly morphology, there are at group 2 and 3. Both of the area of compiler rock generally not yet lihtificated powerfully, water content is high enough especially in rain season and rock generally relative soften

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