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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Kementerian Energi dan Sumber Daya Mineral
ISSN : 08539634     EISSN : 25494759     DOI : -
Core Subject : Science, Education, Social, Engineering,
Education Energy Engineering Environmental Science
Jurnal Geologi dan Sumberdaya Mineral (JGSM) is an Indonesian scientific journal published by the Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources. The journal receives Indonesian or English articles. Those articles are selected and reviewed by our professional editors and peer reviewers.
Arjuna Subject : -
Articles 341 Documents
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POTENTIAL EARTHQUAKE HAZARD MICROZONATIONS OF THE JAKARTA CITY Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 2 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Jakarta, the capital city of the Republic of Indonesia, is a potential earthquake hazard area. The city lies on the very thick ( >294 M ) Quaternary sediments. Destructive earthquakes influenced this city were generated from the subduction and active faults with the Maximum intensity of VI - VII MMI. A microtremor investigation to the shallow soft Quaternary sediment results in the dominant period of 0.05 – 0.85. The classification of this dominant period is the basic classification of rock and soil site and as an important factor of the earthquake hazard susceptibility in a region. Dynamic site responses, which are presented by the multiply of amplification factors and natural dominant periods of this city are divided into five microzonations, these are :–         Very high susceptibility microzonation (index's > 10), covers the area of 7.58 km2  or 1.15 % of the total region of Jakarta occupies a small area of North Jakarta.–         High susceptibility microzonation (index's 7.5 – 10 ), covers the area of 18 km2 or 2.73% of the total region of Jakarta consisting of small area of North Jakarta city (Kapuk resort), Central Jakarta including the area of Setiabudi.–         Moderately susceptibility microzonation (index's 5-7.5), covers the areas of 86.59 km2 or 13.11 % of the total region of Jakarta, including the North, Central, East and South Jakarta and the small area of West Jakarta .–         Low susceptibility microzonation (index's 2.5 - 5), covers the area of 324 km2 or 49.18 % of the total region of Jakarta, and it occupies the western part of North Jakarta, eastern part of west Jakarta and the central part of central Jakarta.–         Very low susceptibility microzonation (index's < 2.5 ), covers the area of 223.47 km2 or 33.83 % of th total region of Jakarta , the area includes a small part of the central Jakarta and the eastern part of west Jakarta.These earthquake hazard microzonations are one of important data base for regional planning in order to mitigate earthquake hazards and risks of the Jakarta city. Keywords: Earthquake hazard microzonation and regional planning 
PETROLOGI DAN GEOKIMIA BATUAN GUNUNG API METULANGDI DAERAH LONGBIA, KALIMANTANTIMUR: IMPLIKASI TEKTONIKANYA Baharuddin, Baharuddin
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 1 (2007): Jurnal Sumber Daya Geologi
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Abstract

Volcanic rocks which crop out at Long Bia area, east Kalimantan, consist of basaltic andesite to rhyolite in composition. They are in the form of lava, dykes, and pyroclastics. Stratigraphically, the  rocks belong the Tertiary Quaternary Metulang Volcanics. Petrographically, the rocks have porphyritic texture with plagioclase, feldspar, and pyroxene phenocrysts that are embedded within a groundmass.  Geochemical characteristic of major elements compose of  SiO2 (52,8 - 62,5 wt.%), TiO2 (0,57- 0,75wt.%), Al2O2  (15.4- 8,6 wt.%), CaO (5,4-9,4 wt. %) dan MgO (3,21-7,89 wt.%) with  depletion on trace elements (Nb, Zr, and Y). In contrast, light rare earth elements (La, Ce, and Nd) and large ion lithophile elements (Ba, Rb. K, and Sr) exhibit enrichment. Characteristics of petrology and geochemistry of the Metulang Long Bia Volcanics indicate that they were formed In an island arc environment and it is interpreted to be related to the Borneo-Palawan subduction activity during the  Tertiary-Quaternary time. Keywords : Petrology, geochemistry, Metulang Long Bia, tectonics
PERBEDAAN GENESA MAGMA ANTARA TIN BEARING GRANITOID ROCKS DARI JALUR KEPULAUAN TIMAH INDONESIA DAN TIN BARREN GRANITOID ROCKS DARI PULAU BINTAN Dirk, Mesker H.J
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 2 (2013): Jurnal Sumber Daya Geologi
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Abstract

There are differences between the granitoid rocks of the Menumbing- Bangka Island, Karimun Island, Kundur Island, with the granitoid rocks of the Bintan Island. The earlier are tin bearing granitoid rocks, while the later are tin barren granitoid rocks. The tin bearing granitoid rocks of Menumbing-Bangka Island, and Karimun and Kundur Islands, are strongly porphyritics, plagioclase as one of the primary rock forming minerals has composition of An0-20, the accessory minerals of ilmenite, zircon, apatite, secondary muscovite ± tourmaline ± flourite ± cassiterite ± monazite are found in the pegmatitic veins. The avarage content of SiO2 ≥ 70 wt%, CaO ≤ 2 wt%, and Na / (Na + K) ≤ 0.6. The tin bearing granitoid rocks are monzogranites, with calk-alkaline affinity, peraluminous, with increasing alkaline components to proportionally decreasing FeO* and MgO components. The age of the tin bearing granitoid rocks is around 211 ± 10 – 200 ± 4 my. or Upper Triassic, have formed from magma generated by melting of graywackce source material at a collision zone or convergence continental margins. The tin barren granitoid rocks of Bintan Island are weak porphyritic textures, plagioclase as one of the primary rock forming minerals has composition of An0-20, and hornblende as mafic mineral. The accessory minerals are magnetite, zircon, apatite, ± sphene. The avarage content of SiO2 ≥ 70 weight%, CaO ≤ 2 weight%, and Na / (Na + K) ≥ 0.6. The rocks are monzogranites and granodiorites, with calk-alkaline affinity, peraluminous, with increasing alkaline components to only decreasing FeO* component. The age of the tin barren granitoid rocks is around 230 ± 2 – 222 ± 3 my. or Middle Triassic – Upper Triassic, have formed at a subduction zone of magma generated from melting of mixed tholeiitic and equivalent graywacke source materials. In addition to those differences, both group of the granitoid rocks also differ in its magnetic susceptibility i.e. the tin bearing granitoid rocks have magnetic susceptibility around (0.18 – 0.90) S.I. unit, and the tin barren granitoid rocks around (2.75 – 7.75) S.I. unit.Keywords: Magma genesis, tin bearing granitoid rocks, Menumbing-Bangka Island, Karimun Island, Kundur Island, Bintan Island.
KECEPATAN PERGERAKAN MAGMA DASIT KE PERMUKAAN DI DAERAH PURWOREJO DAN SEKITARNYA, JAWA TENGAH Berdasarkan Analisis Penarikhan Jejak Belah Permanadewi, Sam; Saefudin, I.; A.Siregar, D.
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 4 (2008): Jurnal Sumber Daya Geologi
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Abstract

Zircon fission track dating using zirkon of four dacite samples from Purworejo, yielded age of 12,6 ± 1,5 to 15,9 ± 1,0 m.a. One cooling phase of the dacite body at Purworejo area indicates an uplift velocity of 0.02 - 0.06 mm / year. Keywords : fission tracks, zircon, uplift, Purworejo
CRETACEOUS ROCKS OF MISOOL ARCHIPELAGO, INDONESIA Hasibuan, Fauzie; Rusmana, E
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 6 (2007): Jurnal Sumber Daya Geologi
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Abstract

Cretaceous  rocks of  Misool  Archipelago   are exposed  mostly on the southern  part of the main  island  of Misool and its adjacent  islets.  The rocks belong to the upper  part of Lelinta  Formation,  Facet Limestone  Group  (Waaf  Formation  and Gamta  Formation),  Fafanlap  Formation  (Yabatano  Member)   and  lower  part of Daram Formation.  The age of the rocks ranges from Aptian  to Maastrichtian  based on their fossil content. The lithology of each formation is redescribed herein.The results show that almost  the whole  formations contain macrofossils such as molluscs and microfossils (foraminifera). The  Gamta Formation  (the oldest)  is  Late  Berriasian to Middle   Cenomanian   in age  based  on  the occurrences  of  Ptilorhynchia  sp., Proclydonophora  sp., Rotularia sp.,  Buchia sp .. ammonite  gen.  et sp. indet, coral indet., and  trace fossils.  Early  Cretaceous  is also indicated  by the presence of Hibolithes  gamtaensls,  H.  miosensis,  Duvalia  spp.,  and Belemnopsis jonkeri. Waaf Formation  (Middle  Cenomanian   to Early Campanian)  contains  rich globigerinid  and other microfossils,  trace fossils, large Inoceramus  up to 70 cm in length with oysters attached to it, and Prochlydonophora   sp. But, this bivalve  is very difficult  to sample. The upper part of the Waaf Formation oontains  abundant  microfossils,  probably indicating  a bathyal   environmenl Fafanlap  Formation and its Yabatano Member contain  micro and macrofossils such as Inoceramus  misoliensis, I. (Cordiceramus}  paraheberti, I.  (C.) cf. pseudoregularis, t. (Selenoceramus)  sufflatus and t.haani,  Durania wanneri, and burrows indet. Micraster and Hemiaster were difficult  to sample,  and so were minor  coral and bryozoan.   lnoceramus spp. which are found  in the lower  part of Fafanlap  Formation  indicate  a Middle  Campanian age. The microfossils  range up to Maastrichtian.  It can be concluded that the age of Fafanlap  Formation  is Late Santonian up to late  Maastrichtian   and  at least Late  Maastrichtian  for the Yabatano  Member.   Based  on the assemblage  of microfossils  reported  by previous workers, the age of the Daram  Formation  in the tower part  can be assumed   as Late Maastrichtian.Biostratigraphic correlation  of Lower Cretaceous in Indonesian  Archipelago  based on microfossils  promising for the islands of Rote,  Timor,  Seram,   Buru, Buton,  the eastern,  central  and south  arms of Sulawesi,  Halmahera,   New Guinea   and perhaps Obi and eastern Kalimantan.  In the upper Cretaceous,  inooeramid  bivalves are more common  and are closely related to those of New Guinea and Madagascar.Cretaceous of the Misool  Archiprelago  is the most difficult part to correlate  within  Indonesia  based on microfossils at present, but is promising   in the future study.   The microfauna  of Misool  is closely  related  to that of the Emscher Marl of Westfalen  In Europe. Theforaminifera  also resemble those of theSeweer   Beds in the European  Alps.   The Easy Cretaceous of the upper part of the lochambel  Beds of Spiti, India  with  the Neocosmoceras-Distoloceras   Assemblage  is probably correlatable  with the upper part  of the lelinta  Formation  of Misool. In Misool, however the latter   is dominated bybelemnites even though similar  in rock facies (chert-bearing   beds).  The inoceramid  species trom Misool,  e.g. lnoceramuscf.  bererensis,  I.  (Cordiceramus)   paraheberti and  I, (C.}  cf. pseudoregularis  are  closely similar to those found inMadagascar,  some perhaps beingcoospecific,   and in both area indicating  a Middle  Campanian  age.Keywords: Misool Archipelago,Cretaceous, Lelinta Formation, Gamta Formation,Waaf Formation, Fafanlap Formation, D aram Formation, inoceramids, belemniles, foraminifera
PENAFSIRAN REKAMAN SEISMIK PANTUL DANGKAL SALURAN TUNGGAL DI PERAIRAN KABAENA, MUNA DAN BUTON, SULAWESI TENGGARA Astawa, I Nyoman; Astjario, P.; K.G. Aryawan, I.
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 1 (2007): Jurnal Sumber Daya Geologi
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Abstract

East Sulawesi terrane, generally called East Sulawesi Ofiolite, consists of ultramafic rock underlying pelagic sediment as a top layer. The rock is interpreted as a basement rock in  the East Sulawesi  Terrane which was formed during early Cretaceous. This ultramafic rock tectonically contacted with Mesozoicum and Paleogen ones, and unconformably overlied by molasses sediment type on the top.A number of single channel seismic profiling has been carried out and passing through between Kabaena, Muna and Buton islands.  Based on outcropping  and distribution  of rock units on those three islands, the seismic lines were made to get a clear geological  setting under the seafloor. Differentiation  of internal configuration  reflector of the seismic  records which  Interrelated  to rock unit on the islands have been interpreted very clearly. The study of seismic single channel records will be more accurate if it is correlated to the offshore drilling data in order to make an estimation of internal configuration reflectors to be definitely  correct. Keywords:  terrane, tectonic, seismic, interpretation, Buton
Meningkatkan Faktor Perolehan Lapangan Marginal dengan Metode Injeksi Air, Sebuah Studi Simulasi Reservoar Slameto, Edy
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 3 (2006): Jurnal Sumber Daya Geologi
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Abstract

The development of marginal fields is becoming a more important alternative method, due to the fact that big and profitable new fields are more difficult to be discovered. A marginal field which is situated in the Western Sunda Basin, here is called as Field X, has big enough reserves in which specific fluid property interest has to be concerned. Its OGIP: 7.675 BSCF and OOIP: 129.058 MMSTB (based on PSC source). According to the trap existing in the field, its drive mechanism is Gas Cap Drive and Water Drive. In order to increase the recovery factor of this field, Enhanced Oil Recovery (EOR) using water injection method has been carried out. Reservoir simulation performed with water injection project to this field could increase the cumulative oil production into 17.160 MMSTB with 13.29 % composite recovery factor for 30 years. Keywords : waterflood, reservoir simulation, marginal, Sunda Basin
CLEAT CHARACTERISTICS IN TERTIARY COAL OF THE MUARAENIM FORMATION, BANGKO AREA, SOUTH SUMATERA BASIN: Implications for Coalbed Gas Potential Permana, Asep Kurnia; Panggabean, Hermes
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 5 (2011): Jurnal Sumber Daya Geologi
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Abstract

The sub-bituminous coal seams of the Muaraenim Formation commonly overlie claystone, sandstone or shaly siltstone. Coal seams are mostly dull to bright banded lithotype, well developed of cleat system, maceral composition dominated by vitrinite with rare inertinite and minor liptinite and mineral matter. In order to determine cleat systems and a possible relationship with the development of coalbed gas potential within the coal seams, detailed observation on coal seams characteristics, determination and measurement on cleat pattern and orientation, as well an insitu gas in place content measurement (Q1) within the coal measures were performed. Field measurement from outcrops demonstrate well-developed cleat within the coal seams, with high in spacing (∑ 8.93 cm) and moderate in density (0.1512/cm - 0.21/cm) and cleat aperture (1 - 3 mm). SEM analysis provides microcleat characteristics with a rare to medium density. Micro focus observation and examination on microcleat, face microcleats appears to be most prominent compared to butt microcleats. Microcleats also found mostly in open aperture. Gas content of the coal seam indicates a low to moderate methane content, with overall calculation of gas in place from six coal seams around 15.297,73 scf. Moderate level of mineral matter content in coal, as well as an excessive rare of clay minerals infill in microcleat may influence on increasing methane adsorption capacity. Moderate to high density and well continuity of cleat and microcleat could affect enhancing permeability, and plays important role in methane migration and production. Indeed, the coal characteristics and cleat systems of the Muaraenim Formation maybe favorable for coalbed gas potential.Keyword: Coalbed gas, Cleat systems, Muaraenim Formation
Bahan Standar Internal dengan Matriks Stream Sediments dari Sungai Berair Payau dan Tawar di Daerah Pangandaran dan Sekitarnya Irzon, Ronaldo; Kurnia, Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 2 (2015): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Bahan standar merupakan persyaratan mutlak untuk memvalidasi sebuah pengukuran. Dibutuhkan biaya besar dalam pengajuan bahan standar berskala certified reference material, oleh karena itu pembuatan materi acuan standar intern dapat menjadi jalan keluar. Sebagai sarana pengujian di lingkungan Pusat Survei Geologi, Laboratorium Geologi harus dapat menyelaraskan fungsinya dengan kebutuhan riset ilmu kebumian di Indonesia. Beberapa tahun sebelumnya tiga bahan standar dengan matriks stream sediment telah dihasilkan. Walaupun sama-sama dari matriks stream sediment, penelitian ini berbeda pada jenis air dimana contoh diambil. Dua dari contoh diambil dari lingkungan air payau, sedangkan satu lainnya dari lingkungan air tawar di sekitar Pangandaran, Jawa Barat. Perangkat Atomic Absorbance Spectrometry dan X-Ray Flourescence dimanfaatkan untuk mengukur kandungan elemen maupun oksida pada contoh bakal standar yang telah melalui proses hingga menjadi banyak split. Perhitungan statistika diaplikasikan untuk mengetahui tingkat homogenitas contoh maupun menetapkan nilai acuan. Uji variansi satu arah berakurasi 95% menyimpulkan bahwa dua contoh dapat dikategorikan homogen dan satu lainnya homogen sempurna. Atas dasar besaran koefisien variansi <5%, lima elemen hasil analisis AAS dan delapan oksida utama hasil analisis XRF dapat dijadikan nilai acuan.Kata kunci - air payau, air tawar, bahan standar internal, stream sediment.
INTERAKSI FAKTOR KENDALI TEKTONIK, PERMUKAAN LAUT DAN PERUBAHAN KLIM DI DAERAH TELUK KLABAT, KABUPATEN BANGKA INDUK, BANGKA Hidayat, S.; Moechtar, Herman
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
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Abstract

The study of the Quarternary deposits in Klabat gulf areas was based on the analyses of the sedimentology and stratigraphy of fifteen borehole information obtained along west to east. The penetration of the bore head varied from 3.50 to 16.80 m from + 21 m to - 4 m of sea-level. Whereas, the Quarternary sediments in the studied area can be divided into seven sedimentary environments, consisting of alluvial fan (FKa), swamp (FRw), floodbasin (FCb), deltaic (FDt), sand beach (FPp), nearshore (FLdp), and nearshore to offshore (FLdp to FLlp) deposits. Based on the lateral and vertical sedimentary environment correlations, the Quaternary stratigraphic succession can be divided into four sedimentary intervals (IP I to IV). Each interval is typically for topography and elevation changes which is controlled by changes of the sedimentary environment systems. The controlling main factor of the sedimentary environment system changes was regional and local tectonics. Changes in tectonic regime are important upon a tidal flat sedimentation. Keywords: facies, paleoenvironment, tectonic

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