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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 10 Documents

Search results for , issue "Vol 13, No 3 (2015): Bulletin of Scientific Contribution" : 10 Documents clear

MANAJEMEN AIRTANAH PADA ENDAPAN ALUVIUM RAWA LAKBOK, JAWA BARAT Hadian, Sapari Dwi; Rahmat, Bombom
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Rawa Lakbok revealed as depression of Citanduy River, developed as peat swamp with type B overflow. Geographically, area of study located on 108° 35’ 29,3” – 108° 36’ 34,6” east longitude and 7° 23’ 33” – 7° 24’ 37, 7”south latitude. Area of study located on Puloerang Village, Sub-district of Lakbok, District of Ciamis, West Java. Geology success-ion of study area will be described in several aspect; Geomorphology, Stratigraphy, and Geological history. Geomorphologically, area of study consist of alluvium plain unit, and moderately steep volcanic unit From stratigraphy aspect, area of study consist of sandstone unit (Tpbp), Andesite unit (Tpa), and Alluvium unit (Qa). With Structural Geology heading South East – North West. Geological history of study area began in Early Pliocene with deposition of sand material. Afterwards, volcanic activity occurred and erupted andesite lava. At the end, alluvium was deposited as response of depression which formed in area of study.From the water balance calculation at Cibeber rivers area with width ± 10.12 kM2, known that : precipitation value 2,805.82 mM/Annual, 58.48% of pouring rain will evaporate, 21.11% will be run off, and 6.25% will infiltrate into the soil. Study area have 17.92% (5,088,437.2 M3/Annual) of axcess water of depression storage, means amount of water that accumulate in the surface of depression bowl from the study area surface run off. Hidrogeology of study area consist of hydraulic gradient values ranging from 0.0008 – 0.004. Hydraulic T Parameter ranging from 5 – 10 M2/day, K values ranging from 1 – 5 M/day, S value ranging from 1 – 5, and Sc value ranging from 17 – 37 M3/day/Mdd. Influence radius of Cone of depression rangingfrom 1.2–2 M. Keywords: depresion zone, groundwater manajemen

PENDUGAAN KETERDAPATAN AKIFER AIRTANAH DENGAN METODE GEOLISTRIK DI KECAMATAN SUKATANI - KABUPATEN PURWAKARTA Mohamad, Febriwan; Firmansyah, Yusi
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research area as administratively is located in Sukatani village, District Sukatani, Purwakarta, West Java Province. Based on the relief morphology, strato volcanic facies models and its lithology, geomorphology of Sukatani is strato volcanoes leg with radial drainage pattern. This area height of about 260-300 meters above sea level. Stratigraphy unit of research area is divided into two units, namely Tufic sandstones-Conglomerates, and Alluvium. The study is intended to determine the position and water resources at a certain depth below the surface and determine subsurface conditions. The study based on measurements of geoelectric method of geoelectric 1-D and 2-D configuration of Schlumberger. The results of study are in the form of rock resistivity values. They are interpreted in the cross-sectional shape and correlated with geological and hydrogeological conditions. Based on the resistivity value, distribution layer in the study area are classified into three packages, namely rock low resistivity layer (<35 ohm-meter) expected role as aquiclud layer, a layer of medium resistivity (35-100 ohm-meters) are expected to act as a layer aquifer, and a layer of high resistivity (> 100 ohm-meters) are expected to act as a layer aquifug.

ANALISIS LINGKUNGAN PENGENDAPAN BATUGAMPING BERDASARKAN DISTRIBUSI UNSUR KIMIA DI DAERAH CIDORA, KECAMATAN AJIBARANG, KABUPATEN BANYUMAS , JAWA TENGAH Fauzielly, Lili; Hamdani, A. Helman
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Studies on the distribution of chemical elements Lawangdora limestone area has been conducted to determine the depositional environment is based on the chemical characteristics . The purpose of this study was to apply the theory of Chilingar who stating that Mg levels will decrease when deposited away from the beach. The results showed that the study area is dominated by calcite limestone, and the type is low magnesium calcite . This is a type of calcite carbonate in deep marine sediments. Based on the cross section of the direction and distance relative to the content of the element magnesium ( Mg ) is seen that the direction of deepening moves relative to the north.

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: GEOLOGY 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.

TINJAUAN KETERDAPATAN BATUAN ULTRAMAFIK DALAM KOMPLEK OFIOLIT CILETUH DI DAERAH CILETUH, JAWA BARAT Hutabarat, Johanes; -, Ismawan
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Ultramafic rock is defined as rock with a color index of more than 70, and most have good characteristics as igneous plutonic and metamorphic rocks. Ultramafic rocks in the area Ciletuh revealed in outcrops scattered as "pockets" (enclaves) in Ciletuh formation, with the tendency of azimuth northeast trending ± southwest, which gives the impression of intrusion body, or as blocks of exotic in Ciletuh Formation. Rock composed of peridotite and serpentinite of massive to foliated; associated with gabbro, basalt pillow structure. Association of peridotite-serpentinite with gabbro, basalt structure of the pillow, giving the impression that the rock may represent parts of the set ophiolite. Based on occurences in the field, where the body is suspected origin of ultramafic rocks in the ophiolite complex Ciletuh speculated a continuous sheet relicts oceanic crust that is emplaced above microcontinent. Part sheet becomes incomplete (dismembered) during emplacement, and then buried (burial) by next geological events (possible sedimentation process produces Formation Ciletuh) that largely hides covered by ofiolitic, and leaving only the ultramafic body which spread in most Ciletuh areas at West Java.

KELIMPAHAN, KEANEKARAGAMAN DAN SPESIES KHAS DARI KUMPULAN FORAMINIFERA BENTIK PADA SEDIMEN PERMUKAAN DASAR LAUT DI PERAIRAN TAMBELAN Isnaniawardhani, Vijaya; Muhammadsyah, Faizal
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Thirty-five surficial sediment samples in Tambelan Seas were studied to identify foraminifera assemblages in the sediments as marine resources. Samples were collected from the strait to the open sea (<100 m), coral reefal (<12 m), sandy beaches and mangrove. Benthic foraminifera assemblages classified in 58 genera of suborder Textulariina, Spirillinina, Miliolina, Lagenina, Buliminina, and Rotaliina. Sub-ordo Textulariina was represented by genera Ammobaculites, Dorothia, Karreriella, Bigerina, Sahulia, Textularia, and Clavulina. Genus Spirilliina is included in the sub-ordo Spirillinina. Genera Adelosina, Nummulopyrgo, Spiroloculina, Agglutinella, Ammomassilina, Lachlanella, Quinquelo-culina, Miliolinella, Pyrgo, Triloculina, Peneroplis, and Marginopora were classified into Suborder Miliolina. Suborder Lagenina was represented by genus Lagena, Guttulina, Oolina, Fissurina and Glandulina; whereas Suborder Buliminina by genus Bolivina, Siphogenerina, and Reussella. Genus Cancris, Valvuli-neria, Eponides, Orbitina, Neoconorbina, Rosalina, Siphoninoides, Discorbia, Lobatula, Planorbulinella, Cymbaloporella, Cymbaloporetta, Gypsina, Epistomaroides, Amphistegina, Nonionoides, Heterolepa, Gyroidina, Hanzawaia, Pararotalia, Rotalia, Ammonia, Asterorotalia, Pseudorotalia, Baculogypsinoides, Calcarina, Elphidium, Parrellina, Assilina, and Heterostegina included in Suborder Rotaliina. Some broken milliolidae can’t be determined. Surficial sediments on open sea generally content a high number of individu as well as high diversity; Sub-ordo Rotaliina dominated. Benthic foraminifera are abundant on reefal, decreased on sandy beach, while are rare in magrove swamp. Benthic foraminifera near reef showed higher diversity than sandy beach and mangove swamps. Amphistegina lessonii was recorded on open marine and coral reefal sediments around Tambelan archipelago. Assilina ammonoides is typical species in open marine; Calcarina calcar in coral reefal; and in contrast, these species were not founded on the sandy beach and mangrove swamps. Abundancy, diversity and appearance of typical species were influenced environment factors as depth/bathimetry, water supply, temperature, sunlight intensity, substrate/sediment type, turbidity, wave and current. The study result is very useful as a reference of benthic foraminifera taxonomy in Indonesia.

DISTRIBUSI SUBMIKROFOSIL (POLEN DAN FORAMINIFERA) PADA DELTA FRONT DI DELTA MAHAKAM, KALIMANTAN TIMUR Jurnaliah, Lia; -, Winantris
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Research area located in the Mahakam Delta, East Kalimantan. The object of research are submicrofossils (pollen and foraminifera) in recent sample sediment derived from the delta front of Mahakam Delta. The amount of sediment that is researched as much as 29 samples. The results of the quantitative analysis showed pollen assemblage consists of 24 species of palmae, 21 species of mangrove and 117 species of non-mangrove. The collection of foraminifera consists of 82 species of small benthonic foraminifera. Based on cluster analysis, pollen assemblage consists of seven biofacies i.e. palmae-non mangrove, non-mangrove A, palmae-mangrove-non mangrove A, palmae-mangrove-non mangrove B, mangrove-non mangrove, palmae, and non-mangrove B . Similarly, foraminifera consists of seven biofacies i.e. biofacies I (Inner Shelf), biofacies II (Coastal lagoon-InnerShelf), biofacies III (Coastal bay – Inner Shelf), biofacies IV (Coastal lagoon/Coastal bay-Inner Shelf), biofacies V (Open estuary/Coastal lagoon-Inner Shelf), biofacies VI (Coastal bay/Coastal lagoon-Inner Shelf) and biofacies VII (mangrove swamp (marsh). The distribution of pollen and foraminifera in delta front suggest that the southern region was more influenced by sea compared with the northern region, and the central region is affected by tidal currents.

PETROLOGI BATUAN OFIOLIT DAERAH SODONGPARAT, KAWASAN CILETUH, SUKABUMI Rosana, Mega F.; Yuningsih, Euis T.; Saragih, Kessar D.; Ikhram, Rinaldi; Ardiansyah, Nugraha
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Ophiolite outcrops offers a unique opportunity to learn directly oceanic lithosphere, as ophiolite represents one of the few outcrops of rock that body can not be reached. Ophiolite is interpreted in the context of plate tectonics, as part of the oceanic lithosphere thrust into the continent during the first phase of orogenesa. Many geologists believe that the definition of ophiolite according to Penrose Field Conference in 1972, which is a typical sequence of rocks composed of, starting from the bottom: the complex ultramafic, gabbro complex, complex sheeted mafic dikes, complex mafic-volcanic and sedimentary pelagos. Ophiolite sequence may be incomplete, torn or termetamorfisme. Group ophiolite in area Ciletuh is an assemblage of mafic rocks (basalt, gabbro and ultramafic (peridotite, serpentinite), which is closely associated with the sedimentary-volcanic and metamorphic rocks. Generally ofiolitnya a sequence ophiolite very incomplete, and the mechanism of the transferor-tempatannya (emplacement ) can be equated with ophiolite "Cordilleran", which is rather a ophiolite (ocean floor, which did not contain fragments of the continent) above the subduction complex.

BASEMENT KOMPLEK BAYAH, KABUPATEN LEBAK, PROPINSI BANTEN Patonah, Aton; Helmi, Faisal; Prakoso, Jodi; Widiaputra, Taufiq
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Researching metamorphic rocks in Bayah and in its surrounding area has slight data so it has not been clear yet how the stratigraphic position, the age and the metamorphic rocks characteristic is in the study area. By using geological mapping and petrographic method, it showed that the metamorphic rock is believed to be the basement of Bayah complex which accreted because of reverse fault in the northwest so that the rock appeared together with the relatively younger rocks in the south (Bayah Formation and Granodiorite Cihara). These rocks showed that there are foliation, boudinage and crenulation structure consisting of various types of metamorphic rocks which are different in degrees of metamorphism (low grade – high grade metamorphism) and in protoliths as well, so these interpret as a result of orogenic processes of intermediate pressure metamorphism.

TINJAUAN ALIH-TEMPAT KELOMPOK OFIOLIT DI DAERAH CILETUH, JAWA BARAT Sendjaja, Yoga Andriana; Sunarie, Cecep Y.
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

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Muhammad Kurniawan Alfadli

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Home Page

OAI Link

Editorial Team

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Reviewer

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Contact Name Muhammad Kurniawan Alfadli

Contact Email m.kurniawan@unpad.ac.id

Phone +6285669298592

Journal Mail Official bsc.ftg@unpad.ac.id

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Location Kota bandung, Jawa barat INDONESIA

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Contact Name
Muhammad Kurniawan Alfadli

Contact Email
m.kurniawan@unpad.ac.id

Phone
+6285669298592

Journal Mail Official
bsc.ftg@unpad.ac.id

Editorial Address
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Location
Kota bandung,

Jawa barat

INDONESIA