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FASIES BATUBARA FORMASI WARUKIN BERDASARKAN ANALISIS CORE DI DAERAH SUNGAI DIDI, KECAMATAN DUSUN TIMUR, KABUPATEN BARITO TIMUR KALIMANTAN TENGAH Yuniardi, Yuyun
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
Publisher : Universitas Padjadjaran

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Research area layed on Sungai Didi, Dusun Timur District, Barito Timur Residence, KalimantanTengah Province. The border in geographically, 1150 11’ 1,22” – 1150 12’ 35” East Longitude and 20 2’27,93” – 20 3’ 28,74” South Latitude.Geology of research area consisted of two rock units, there were sandstone unit and claystone unit.Claystone unit consisted of claystone with alternated by coal, and then sandstone unit consisted ofsandstone which have coarse grain to fine grain. Both of those units were related with WarukinFormation, where formed at fluviatil environment with Middle Miosen of age.Research area facies would have four kinds and made into the group, there were MS (massivesandstone), FS (fining upward sandstone), CL (claystone) and Co (coal). Facies model which made haveconsisted of MS facies in lowers followed with FS facies, and then CL facies and Co in uppers.Keywords : Warukin Formation, Fluviatil, Facies
PERAN GEOLOGI TEKNIK DAN ANALISIS KEWILAYAHAN DALAM GEOLOGI MILITER DI INDONESIA Zakaria, Zufialdi
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
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Since ancient Chinesse era to World-War 2, knowledge of geoscience hold important role in themilitary world. Landscape analysis (potency and constraint) for military is needed to evaluate enemymovement and its war equipments, to determining access of location rute, to mapping hydrogeologysurface and underground for structural defence & military personnel and also for attack. Though Spot-5,Ikonos and Quickbird sattelite images’ exist, but map of military geology is necessary to remainingsurface material physical characteristic toward teritorial enemy and also to develop defence citadel.Map and scale of military geology based on engineering geology condition for need of military. Variationscale depend on needed, from big scale (most detailed) to small scale (regional).In Indonesia, Indonesian Association of Geologist (IAG) both Geological Research and DevelopmentCenter (GRDC) not had Unit of Military Geology yet. In America, Unit of Military Geology was formedsince 1942. This unit duty is complie terrain intelligence, how troops can be move in land; finding ofwater, fuel, mineral and construction material, solving construction problem and base landing plane. 
KARAKTERISTIK LAVA DAN KEMUNGKINAN PEMANFAATANNYA SEBAGAI BAHAN GALIAN KONSTRUKSI DAERAH MALIMPING KABUPATEN BANDUNG, JAWA BARAT Sukiyah, Emi
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
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This research background are potency and limitation aspects in construction material resourcesapplication in southern part of Bandung Regency. The problem of research is role of lava characteristicin application designe as construction material resources. This research use deduction method withprobabilityapproach. Result of research show lava at Malimping area and surrounding have characteristicare grey-black, fine to intermediate texture, basaltic. A part of lava has sheeting joint and anothermassive. Based on petrographic analysis, a part of lava has a little alteration. That condition showed bya part of pyroxene had altered to chlorite. Result of chemical and physical analysis of rock show lava atMalimping area and surrounding is basalt. Potency of lava at Malimping is significane as contructionmaterial. Based on morphometry calculation and lava outcrop spreading, lava potency estimated44.573.500 m3. Nevertheless, that all potency can’t used because it spread in upper area of Citarumriver. Based on lava characteristics, outcrop position, regulation of landuse and trend of communityneed so that basalt lava potency used as dimention stone. That using can up value of contructionmaterial so that income of community in that surrounding area can up too.
PENENTUAN TIPOLOGI AKIFER BERDASARKAN METODA GEOLISTRIK DAN HIDROKIMIA, KOTA TANGERANG Dwi Hadian, M. Sapari
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
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Electrical sounding expectation is used to estimate the early model from a groundwater system in thefield, which can be used as a comparison of field results. The comparison enhances to entrust the processof field activities and provide the opportunity to modify the programs in the field and to ensure that we haveenough information received efficiently - in a point of view of geological framework. A Usefulness of amapping hydrogeology is to show the under surface geometry (structure) and the hydraulic property fromearth materials which is used to investigate the hydrodynamic property appeared from the undergroundwater on natural shares ( Basin) or a part of its filler.The exploration using the method of the electrical sounding is conducted on land surface by injecting adirectional current (DC) with a low frequency into a deeper ground passing through two current electrodes.A different potential capacity is measured on the surface by two potential electrodes. The result of themeasurement capacity which is injected and the potential difference occurred in every different electrodedistance will give a value variation of a typical resistance. The value variation shows the existence of anunderground rock coat variation, while the method of hydrochemistry explains the genesis of thegroundwater based on a physical characteristic and chemistry substances on the field.Both methods are expected to reconstruct the aquifer condition and its system through surface andunderground surveys. The combination results of both surveys must be depicted in a form of ahydrogeology map (and its differential map), a block diagram depicting the aquifer, and aquifer system ina form of two dimensions. The other surface hydrogeology surveys use geological method. In contrast, theunderground hydrogeology survey use the electrical sounding method.
PENELITIAN STRUKTUR GEOLOGI DAN KAITANNYA TERHADAP KEMUNGKINAN ADANYA POTENSI EMAS PRIMER DAERAH GUNUNG ASTANA BOGOR, JAWA BARAT Haryanto, Iyan
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
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The study area that is mainly hilly, contains volcanics matters such as breccias, tufaceous lapili, tufand lava. Several outcrops are followed by mineralization where quartz vein also occurred.Developed structures in the study area are quite complex, where NE – SW faults pairing with NW –SE faults. Mineralization zones and quartz vein are found on faults segments, these evidence shows thatthere are primary Au prospect at the subsurface in the study area.
TEKTONOSTRATIGRAFI CEKUNGAN OMBILIN SUMATERA BARAT Mulyana, Budi
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
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Ombilin Basin is represent basin intramontane which limited by volcano-plutonic of Bukit Barisanand zona of Sumatera Fault system which representing a active strike-slip fault zone in west andmetasedimen rock in. Form of fisiography Ombilin Basin show a hilly at part of edge of east-west untilto north with precipitous morphology and level-off continent. Ombilin Basin basement is divided twopart, that is structured basement by Mergui terrain and Woyla terrain. Eldest Basement of Ombilin Basinis Formation of Limestone crystallin of Silungkang (age Perm) which laid bare at Tanah Hitam whichrepresent the part of Mergui terrains continent.Tectonism of Ombilin Basin is started at Paleogen related to peripatetic Southeast Asia tectonismwhich moving of India Block to northern. Early Paleogen, Ombilin Basin is formed with early motion oftranstensional effect of strike-slip fault motion of duplex regional, that is graben part of northeastOmbilin Basin. Motion of strike-slip fault are Sitangkai fault and Silungkang fault where this faultsmotion result attraction style in the form of normal fault by terrace to left north-south. This fault patterncontrol forming of first basin cause to be formed its faults which instructing northwest-southeast, northsouth,and northeast-soutwest of west-east. Tectonostratigraphy Ombilin Basin is represent full grabenwith set of deposits syn-rift tectonostratigraphy and of post-rift deposits continue at mechanism oftransgressive in the early Neogen.
REKAM INTI SEDIMEN GUNA PREDIKSI PERUBAHAN LINGKUNGAN DI DELTA KALIGARANG, PROVINSI JAWA TENGAH Astriandhita, Karina Melias; Winantris, .; Muljana, Budi; Putra, Purna Sulastya; Praptisih, .
Bulletin of Scientific Contribution: GEOLOGY Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Original Source | Check in Google Scholar | DOI: 10.24198/bsc geology.vol15.2017.3

Abstract

ABSTRACTDetailed 20 meters core sampling of sediment was carried out from the recent deltaic Kaligarang, northern part Semarang, Central Java. The main objective of this research is to predict environment changes according to some parameters sedimentation process, for example grain size, organic and inorganic content and the occurrence of benthic foraminifera. The core was analyzed by destructive techniques. The sediment record indicated that the silt grain size dominance deposited in littoral to inner shelf with high organic content than inorganic. Keywords: Kaligarang Delta, grain size, organic content, foraminifera ABSTRAK20 meter rekaman vertikal inti sedimen resen dari Delta Kaligarang, Semarang Utara, Jawa Tengah. Objek penelitian ini untuk memprediksi perubahan lingkungan saat sedimen terendapkan berdasarkan dari parameter besar butir, material organik dan inorganik, dan foraminifera bentik. Inti batuan dianalisis dengan teknik dekstruktif. Hasil penelitian menunjukan bahwa karakter sedimen memiliki dominansi lanau yang terendapkan pada lingkungan litoral-paparan dalam disertai kandungan material organik lebih tinggi dibandingkan inorganik. Kata kunci: Delta Kaligarang, besar butir, material organik, foraminifera
HUBUNGAN ANTARA GEOKIMIA MINYAK BUMI DAN BATUAN INDUK DI SUB-CEKUNGAN ARDJUNA TENGAH, CEKUNGAN JAWA BARAT UTARA Yazid, Yusron; Haryanto, Agus Didit; Hutabarat, Johanes
Bulletin of Scientific Contribution: GEOLOGY Vol 15, No 1 (2017): Bulletin of Scientific Contribution
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ABSTRACTThe research area is located in offshore North West Java, Central Ardjuna Sub-Basin that belonging to PT. Pertamina Hulu Energi Abar. The study focused on the source rock in Talang Akar Formation and hydrocarbons contained in the area. The data used in this research is the source rock and oil geochemical data. Source rock data is evaluated from wells YZD-1, YY-1 and DZN-1. From the analysis of the source rock was found that the source rock generate the hydrocarbons in the well YZD-1 and YY-1. The source rock is dominated by organic material with kerogen type II-III and III-II are derived from terrestrial organic material that mixes with algae tend to produce a mixture of oil and gas. Source rock organic material in wells YZD-1 depth interval 8421.9-8450 ft. deposited in the deep lake area in the oxic conditions. While the organic material in the source rock in the well YY-1 depth interval 6898.92-6909ft. deposited in the shallow lake in the oxic conditions. There are four oil samples, namely samples DST1 CC-1, CC-1 DST3, FZE-1 DST1, and FZE-1 DST2. The analysis showed that there is a positive correlation between samples and showed that the sample is deposited on the deep lake environments and shallow lakes with a mixture of organic material higher plants and algae. Based on the geochemical characteristics, oil samples taken from a number of wells are positively correlated to the source rock samples. Based on burial history modeling, the oil generation in the Basal Talang Akar Formation in this area began in the Early Miocene to the present. And in the Deltaic Talang Akar formation began in the Middle Miocene to the present. Keywords: Biomarker, Geochemistry, NWJ Basin, Petroleum, Source RockABSTRAKDaerah penelitian terletak di lepas pantai Jawa Barat Utara, Sub-Cekungan Ardjuna Tengah yang  termasuk ke dalam wilayah opreasi PT. Pertamina Hulu Energi Abar. Penelitian ini difokuskan  kepada batuan induk pada Formasi Talang Akar dan hidrokarbon yang terdapat pada daerah tersebut. Data yang digunakan dalam penelitian ini yaitu data geokimia batuan induk dan minyak bumi. Data batuan induk yang dievaluasi berasal dari  sumur  YZD-1, YY-1 dan DZN-1. Dari  analisis  batuan induk didapatkan bahwa  batuan  induk yang dapat menggenerasikan  hidrokarbon  terdapat  pada sumur YZD-1 dan YY-1.  Batuan induk tersebut didominasi oleh material organik kerogen tipe II-III dan III-II yang berasal dari material organik daratan yang bercampur dengan alga dan cenderung menghasilkan campuran minyak dan gas bumi. Material organik batuan induk di sumur YZD-1 pada interval kedalaman 8421.9-8450 kaki diendapkan di daerah danau dalam dengan kondisi oksik. Sedangkan pada material organic pada batuan induk di sumur YY-1 pada interval kedalaman 6898.92-6909 kaki diendapkan di daerah danau dangkal. Terdapat empat buah sampel minyak yaitu sampel CC-1 DST1, CC-1 DST3, FZE-1 DST1, dan FZE-1 DST2. Hasil analisis menunjukkan bahwa terdapat korelasi positif antara sampel-sampel tersebut dan menunjukkan bahwa sampel tersebut  diendapkan pada lingkungan danau dalam dan danau dangkal dengan material organik campuran tumbuhan tingkat tinggi dan alga. Berdasarkan karakteristik geokimia, sampel  minyak  yang  diambil  dari sejumlah sumur tersebut berkorelasi positif dengan sampel batuan induk. Berdasarkan permodelan sejarah pemendaman diketahui generasi minyak pada Formasi Basal Talang Akar  di area ini dimulai pada Miosen Awal hingga saat ini. Dan padaFormasi Deltaic Talang Akar di mulai pada Miosen Tengah hingga saat ini. Kata kunci: Batuan Induk, Biomarker, Geokimia, NWJ Basin, Petroleum
VALUASI BAHAN GALIAN GOLONGAN C (BGGC) DI KABUPATEN CIREBON DITINJAU DARI PENGELOLAAN DAN INVESTASI Sulaksana, Nana
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
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In order to optimize the ability of mineral resources which are utilized to give people a more prosperous life, we need not only an adequate mining management which is appropriate with the characteristic of the mineral resources but also a stocktaking of the existence of the mineral resources in a form of map information which is included in a work identification and a mapping of mineral potencies. Exploiting the mineral resources optimally by maximizing added values and minimizing negative impacts of mineral resources exploitation, will increase the PAD (Original Local income) and labour absorption. Therefore, research continuity is essential to create in order to collect the basic information of the mineral potencies, especially constructive and industrial deposits, hopefully it will be able to support the exploitation activity. Work identification and mapping of a mineral potency represents the most basic need now, considering that Cirebon Regency has to be ready to implement the Local Autonomy based on the constitution number 22 Year 1999st, especially in a mining field. The result of the work identification will become a basic and main force for the Mining and Energy Department in Cirebon Regency in order to promote its natural resources and to accelerate duties on mine workings building and supervision.
KOEFISIEN AIR LARIAN BERDASARKAN PENUTUPAN VEGETASI DAN PENGUKURAN DEBIT ALIRAN SUNGAI CEKUNGAN PENGALIRAN SUNGAI (CPS) CITARIK HULU Haryanto, Edi Tri
Bulletin of Scientific Contribution Vol 12, No 1 (2014): Bulletin of Scientific Contribution
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Upper Citarik Catchment has an area of about 30,41 Km2 or around 30.000 Ha. Based on topographic map “Rupa Bumi Indonesia”(RBI), the upper area of the catchments still covered by forests which can restrain the increase of runoff coefficient.There is also water fall “Curug Cinulang in the Catchment, the interesting natural tourist attractions that push the growth of economic activities and tourism facilities, changing land use which can increase runoff coefficient and improve flow discarge. The research method used was land use mapping based on the Topographic Map “RBI” with scale of 1 to 25000, and measurements of each land use types using GIS techniques. Discharge estimation using empirical formula and measurements in the field. The results showed dense forest cover, plantations, and scrub affect the coefficient runoff. Forests affect the stability of the river flow based on measurements and calculations with different assumptions rainfall intensity. The river discharge was relatively stable at stations 6 and 7 with more than 90% of land covered by good forest.

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