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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 6 Documents

Search results for , issue "Vol 7, No 2 (2009): Bulletin of Scientific Contribution" : 6 Documents clear

SUSCEPTIBILITY OF LANDSLIDE IN THE FOREST REGION OF THE CIMANUK RIVER CATCHMENT AREA, WEST JAVA, INDONESIA -, Dicky Muslim
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

In Indonesia, a program in rehabilitation of forest region on destructed land had become a national movement (GNRHL) by the central government on the river catchment area since 1999. Destructed forest implies to the decreasing its natural function which physically related with geological hazards such as erosion, landslide, etc. In the forest region of the Cimanuk River catchment area, landslide frequently occurs every year. As an initial step to build the early warning system, mapping of landslide susceptibilityis necessary. In this study, landslide susceptibility is approached through analysis of Geological map, rock/soil engineering formation, quantitative analysis of slope stability (SF) and plotting of previous reported landslides in the forest region.Result of analyses shows that there are 4 types of susceptibility on the study area. Highly susceptible is characterized by mountainous to hilly area on thick soil of fine grain sedimentary rocks with high density lineations representing geological structures. Medium susceptibility is characterized by hilly area on thick to thin soil of coarse grain rocks with medium density lineations. Low susceptibility is characterized by hilly area on thin soil of coarser grain from sedimentary and volcanic rocks. Very low susceptibility area is characterized by soil on alluvial plain. Special attention is carried out on swelling-shrinking type of soils, neotectonism and bare forest area on the toe of slope.

TEKTONIK BATUAN PRA-TERSIER JAWA BARAT -, Iyan Haryanto; -, Aldrin Ramadian; -, Faisal Helmi
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Pre-Tertiary Melange is the oldest rocks outcrop that found in Ciletuh area. Stratigraphically, this mélange is basement rock that overlaid unconformity by Tertiary sedimentary rocks, i.e. Ciletuh and Jampang FormationThe outcropping mechanism of Pre-Tertiary rock in this area due to up-tilting, thrusting and folding that followed by sliding. The product of sliding is represented by a elongate scarp toward the sea..

MINERALISASI PADA BREKSI HIDROTERMAL, DAERAH TEPU, TAMBANG EMAS TERBUKA KELIAN, KECAMATAN LINGGANG BIGUNG, KABUPATEN KUTAI BARAT, PROPINSI KALIMANTAN TIMUR -, Antonius Bambang Yuniarto; -, Ildrem Syafri
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This research was carried out at the southern pit wall in the open gold mining area of PT. Kelian Equatorial Mining, located at 00 00 '32, 56 "S - 00 05 '09, 14" South Latitude and 1150 23’ 29,02" - 1150 28' 04,73" East Longitude. Administratively, it located in the Tepu area, Subdistrict of Linggang Bigung, West Kutai, East Kalimantan province. Physiographically that area is a part of Central Kalimantan volcanic arc.Rocks exposed in this area can be divided into 4 (four) rock units, i.e. The Eocene Sandstone Unit; The Lower Miocene Andesitic Pluton Unit; The Middle Miocene Hydrothermal Breccia Unit; and The Early Miocene Diatreme Breccia Unit.Geological structures that developped in this area were joints and faults. The faults are dilational structures types, in the form of sinistral- and dextral normal faults. These geological structures facilitated the penetration of andesite, followed by the appearence of hydrothermal fluids which produced the formation of hydrothermal breccia, and diatreme breccia. Hydrothermal breccia fragment consisting of andesite and sandstone, usually in jigsaw textured which are arranged in a matrix rock flour (Sillitoe, 1985), i.e. very fine grained material that came from milling process of breccia fragments. The carbonate minerals in the form of bladed texture are dominat minerals that filled the interfragments and matrix cavities. Partially, apart of carbonate minerals, the bladed silica was also present in cavity filling. The cavity filling minerals are associated with the appearence of metallic minerals.The alteration zones in the research area can be grouped into three zones, namely: 1.) Zone containing chlorite + clay + sericite + adularia + carbonate 2.) Zone containing sericite + carbonate + clay + adularia ± quartz and 3.) Zone containing carbonate + clay + sericite + adularia + quartz / silica. These alterations are classified as subpropylitic - until phyllic zones (Corbett & Leach, 1996). Metal mineralization such as sphalerite, galena, pyrite, covellite, arsenopyrite and chalcopyrite are associated with carbonate alteration ± adularia ± quartz ± sericite ± clay were primarily formed as a cavity filling and veins in hydrothermal breccia. The analysis results of Au and Ag contents in some rocks samples of hydrothermal breccia ranged from 0.04 grams / ton to 8.96 grams / ton Ag and 0.55 to 11.8 grams / ton, while the recovery of Au ranged between 16.08% up to 85.12%. The highest content and % recovery value of Au was founded in hydrothermal breccia.The mineralization stages can be divided into three stages: 1). The pre-brecciation stage that associated with the occurence of chlorite, sericite, adularia, clay and pyrite dissemination as well as the formation of carbonate veinlets and quartzs in direction of the Northwest - Southeast, 2) The syn-brecciation stage, it related to the formation of hydrothermal breccia, i.e. the occurence of carbonate and silica enrichment and the alteration minerals such as sericite, adularia, clay that related to the deposition of base metals as cavity filling and as veinlets in the direction of Southwest-Northeast. 3) Post-breccia stage was related to the occurence of carbonate veinlets ± base metals which associated with the clay minerals. Those cut the fragments, rock flour matrix, cavities filling minerals in hydrothermal breccia after the their formation in the direction of Southwest-Northeast.Mineralization in the area of study occured as ore deposits in hydrothermal breccia and in the veins as well as the veinlets. Hydrothermal breccia formed by two processes, i.e.; structural control and high-pressure hydrothermal fluids, at the temperature more than 200° - 250° C, with the acidity condition of (pH) 6, 6-8, 3. This condition is classified as a system of low sulphidation that related to porphiry with gold-carbonate base metal deposits (Corbett & Leach, 1996).

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.

KARAKTERISTIK ENDAPAN GUNUNG GEDE KAITANNYA DENGAN KETERDAPATAN AIRTANAH UNTUK KEPERLUAN MASYARAKAT DAERAH GEKBRONG KABUPATEN CIANJUR -, Undang Mardiana; -, Febriwan Mohamad
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Administratively, Gekbrong area included into Kabupaten Cianjur region; this area is frontier between Kabupaten Cianjur ( Gekbrong) with Kabupaten Sukabumi ( Cimangkok), resides in Cianjur – Sukabumi roadside. Morphologically as centered bevel of Gunung Gede (Volcano mount foot geomorphology set) with inclination bevel of between 5 - 45 % and height between 400 - 1400 meter asl. River drift pattern grows in this area is sub-parallel pattern which mains to Cibeleng river, with relative Northwest – Southeast stream direction. Geology of this area compiled by pyroclastic and laharic rock; consisted of breccia, tuff, lapilli and laharic breccia from Gunung Gede, while laying below it are compilation between Cantayan Formation Breccias component with Upper Miocene age (Mttb), Cantayan Formation Claystone component with Upper Miocene age (Mttc), Resulting Deposit Of Eldest Volcano ( Qot) Early Plistocene age and Mount Gede Lava ( Qyl) Mid Plistocene age, Breccias and lava of Mount Gede ( Qyg) Late Plistocene age (Cianjur Sheet Geological Map; Sudjatmiko, 1972).Geoelectric investigation done on the basis of physical rock properties to electric current, where each different rock will have different resistivity value. This consideration depends on some factors, such as rock age, electrolyte content, rock solidity, number of minerals contained, porosity, permeability and others. Mostly applied geophysical exploration method in subsurface hydrogeology investigation is geoelectric method (resistivity method). This sounding type also called as Vertical Electric Sounding ( VES), aimed to study various rock resistivity to vertical depth below measuring points (measuring point).Geoelectric investigation result show that there are three rock packages based on distribution and contrast of resisivity value which are interval between rugged and fine clastic and shows more laharik process after compared to its geology condition, such as :a.First package is the topmost package which is phyroclastic rock found at interval depth of 0 until - 30 meter with resistivity value of < 50 Ω m , 50 - 100 Ω m and 100 - 150 Ω m. b.Second package, being volcanic rock package found at interval depth of 0 until - 30 meter with resistivity value of < 50 Ω m, 50 - 100 Ω m and 100 - 150 Ω m. c. Third package start t at - 100 meter depth, compiled by rock with resistivity value between 40 - 50 Ω m (lapilian tuff) and 50 - 100Ω m (lapillian matrix supported breccias).

INVENTARISASI POTENSI BIJI BESI DAERAH GUNUNG BATU BESI DESA MASEWE KECAMATAN PAMONA TIMUR, KABUPATEN POSO, PROPINSI SULAWESI TENGAH -, Geni Dipatunggoro
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Inventory of potency of iron ore mineral resources in Batu Besi Mountain Region, at the village of Masewe, Subdistric of East Pamona, Regenct of Poso, Provine of Central Sulawesi was sponsored by Energy and Mineral Resources Office of Region of Poso and conducted by Team of Geologists from Faculty of Geological Engineering, University of Padjadjaran Bandung.Iron ore mineral resources occur ultrabasic rock of Pompangeo Formation which is older than Cretaseous. Sevaral sample exhibit Fe content larger than 50% which have domestic and international marketing prospect especially in China

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Muhammad Kurniawan Alfadli

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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
-

Location
Kota bandung,

Jawa barat

INDONESIA