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Sekretariat Redaksi Jurnal Geologi dan Sumberdaya Mineral Pusat Survei Geologi, Badan Geologi, Gedung A, Lantai 1 Jalan Diponegoro No. 57, Bandung, Indonesia
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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Pusat Survei Geologi
ISSN : 08539634     EISSN : 25494759     DOI : https://doi.org/10.33332
Core Subject : Science,
Chemistry Earth & Planetary Sciences Energy
The JGSM acts as a publication media of high quality scientific investigations resulted from various geological scientific issues. Published articles covers Geo-sciences, Geo-resources, Geo-hazards, and Geo-environments. Geo-sciences are basic earth sciences in geology, geophysics, and geochemistry. Geo-resources are applied earth sciences scoping in geological resources. Geo-hazards are applied earth sciences concerning in geological hazards. Geo-environments are applied earth sciences focusing in environmental geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 482 Documents
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PERHITUNGAN VOLUME HIDROKARBON BERDASARKAN DATA GEOKIMIA PADA LAPISAN SERPIH FORMASI SINAMAR, SUMATRA M. H. Hermiyanto Zajuli
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 1 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i1.132

Abstract

Research area located at northwestern part of South Sumatra Basin, occupies 8% of the  total distribution of Sinamar Formation. The Oligocene Sinamar Formation consists of shale, claystone, mudstone, sandstone, conglomeratic sandstone, and intercalation of coal seams. This research was focused on fine clastic sediments of the Sinamar Formation, such as shale, claystone, and mudstone. Based on the analysis results of source rock richness and maturity, shale of the Sinamar Formation has a good to excellent degree of richness (2% - 10%) as a source rock. The shale of Sinamar Formation tends  to produce oil derived from type I kerogen (HI > 600 mg HC/TOC). If the shale of Sinamar Formation has an adequate maturity it will produce oil around 5.02 million barrels, while from the total shale of Sinamar Formation approximately 6.08 billion barrels.Keywords : Sinamar Formation, TOC, HI, kerogen type, Rock-Eval pirolysis, hydrocarbon
ANCAMAN BAHAYA LETUSAN GUNUNG API SKALA BESAR DAN MONOGENESIS DI INDONESIA S. Bronto; R. Setianegara
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 1 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i1.133

Abstract

Indonesia has a lot of volcanoes which their potentially hazards threaten people and environment. Mitigation efforts have been conducting to 129 active volcanoes where source locations and types of hazard are relatively well defined, mainly based on historical records. However, volcanic hazards due to larger eruptions, such as caldera explosions and gigantic volcanic debris avalanches, still require basic geological data. This also includes potentially hazard studies on monogenetic volcanoes, that may form a new vent at outside of the present active volcano. This idea is proposed based on facts that there has no a large scale explosion since the Tambora 1815 and Krakatau 1883 eruptions, but large scale tectonic activities have frequently occurred recently causing big tsunamis and earthquakes. Secondly, Sidoarjo mud volcano has been erupting for long time, and volcanic areas are occupied for living and business, intensively.Key words: hazard, volcano, caldera, explosion, avalanche, monogenetic
MIKROZONASI BAHAYA GEMPA BUMI DI WILAYAH KOTA BANDUNG BERDASARKAN DATA MIKROTREMOR Marjiyono Marjiyono; Afnimar Afnimar
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 1 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i1.134

Abstract

Bandung is one of the metropolitan city which rapidly developed and tectonically located in the vicinity of active tectonic lines. The surface geology condition of this region vary from very soft sediments to hard volcanic rocks. The soft sediment area has potential to experience amplification when an earthquake occure. Characterization of surface geology is necessary to identify vulnerability level in order to mitigate the earthquakes hazard in this region. In this regard, we have conducted microtremor measurements in 97 sites which are spread throughout the city of Bandung. Data processing is based on the Nakamura method (HVSR) to obtain the value of amplification factor. The results show the value of amplification factor ranged from 2.1 to 17, with the highest amplification factor distribution in the southeastern of the research area. Distribution of this very high amplification factors are broadly corresponded with lacustrine sediment (lake sediment). The amplification factor scores were then used as the basis in determining the level of relative vulnerability to earthquake hazards.Keywords : microtremor, effect of surface geology, amplification factor, Nakamura methods.
TEKTONOSTRATIGRAFI BUSUR BANDA LUAR DENGAN REFERENSI BAGIAN BARAT TIMOR LESTE DAN BAGIAN TIMUR PULAU SERAM Syaiful Bachri
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.135

Abstract

Timor and Seram Islands are parts of the Banda Outer Arc which represent a collision zone between Northwest Shelf of Australia and the subduction system of the pre-collisional Banda Arc. Consequently, the rock units in this region can be catagorized into three different tectonostratigraphic sequences which represent differents origins. The first sequence is called the para-autochtonous sequence which is derived from NW Shelf of Australia, and is still lying on its basement, since the basement also moving northwards together with its sediment cover. The second sequence is pre-collisional Banda forearc sequence, and is called the allochtonous sequence, which overthrust on to the para-autochtonous sequence forming nappe structures. The third sequence is autochtonous sequence which is unconformably overlying the para-autochtonous and allochtonous sequences. The Bobonaro Complex in western part of Timor Leste can be compared with the Salas Complex in the Seram Island which represent the oldest aotochtonous unit forming olistostrom deposits. On the other hand, ophiolites in western part of Timor Leste can be compared with ultramafics rocks in eastern part of Seram Island, forming the basement of the allochtonous sequence. Meanwhile, the Lolotoi Complex in western part of Timor Leste can be correlated with the Kobipoto Complex in estern part of Seram Island, which form the basement of the para-autochtonous sequence.Key words: Para-autochtonous sequence, allochtonous sequence, autochtonous sequence, Banda outer arc, wester part of Timor Leste, Eastern part of Seram Island
KONTROL SIRKULASI IKLIM DAN TEKTONIK TERHADAP ENDAPAN SEDIMEN SUNGAI PURBA BERUMUR PLISTOSEN DI DESA MULYASEJATI, KARAWANG DAN CILANGKAP, PURWAKARTA H. Moechtar; Subiyanto Subiyanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.136

Abstract

A study on the conglomeratic sandstone and siltstone unit (Qoa) in the Mulyasejati Village (Kabupaten Karawang) and Conglomeratic and tuffaceous sandstone unit (Qav) of Pleistocene age in the Cilangkap Village (Kabupaten Purwakarta) has been carried out. The objectives of this paper are to reconstruct the mechanism of Depositional Period Intervals (DPI) of each lithologic unit. Sedimentological and stratigraphical analyses were carried out in the field based on seven vertical measured section of 1:50 scales. The thickness of the sections range from 1.20 to 7.70 m. Based on the correlation, both of lithostratigraphic units belong to into fluvial systems, and can be divided into four DPI (A to D). The sedimentary facies pattern of each DPI is controlled by the thrust structure, and are shown by stacking channels (FAS) 1 to 4. Whereas, the vertical composition of sediment is controlled by the fluctuation humidity related to climate change following Milankovitch cycles. Changes in the colour and composition of the sediments of the fluvial systems during the depositional processes of DPI A-D, can be interpereted as the result of climate changes. The climate circulations starting from nearly climatic optimum to climatic minimum or even dry.Keywords: facies, fluvial, climate, Interval of Deposition Periods
PERKEMBANGAN CEKUNGAN ANTAR-BUSUR DI DAERAH MAJALENGKA-BANYUMAS: SEJARAH TEKTONIK KOMPLEKS DI WILAYAH BATAS KONVERGENSI H. Permana; P. S. Putra; A. F. Ismiyanto; I. Setiawan; M. Hendrizan; M. M. Mukti
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.137

Abstract

An intra-arc basin, Late Miocene to Pliocene in age in the region of Majalengka - Banyumas area has been an interesting theme to be discussed. The volcanoclastic sediments pathway in this basin showing different direction compare to the time equivalent sediments in the adjacent Bogor Trough. Bouguer anomaly analyses clearly imaged the E-W regional structural grains of Bogor – Bandung –Majalengka crosscut pair of NW-SE Gabon dan Pamanukan-Karangbolong strike slip fault that parallel with the postulated intra-arc basin. These NW-SE structural lineaments could be responsible for the development of sub-basins and volcanic products through splay or duplex fault or pull apart mechanism in context oblique plate subduction in Early Miocene. Study of Majenang sub-basin, whereas epiclastic rocks deposited as sediment-gravity flows and their pyroclastic, shows the significance variation, upper, middle slope to basinal plain within the deep sea submarine-fan complex of the Late Miocene-Pliocene age during the development of this basin. The source of sediment deposits was associated with calk alkalin back arc volcanic edifice that grown and separated the sub-basins and other volcanoclastic source from Southern Mountain (Old Andesite Formation). The development of this basin indicates complex history since this region is now inverted and built the mountain range. Therefore further tectonic reconstruction in this region is required for better understanding the geologic history merit further geological exploration prospect.Keywords: intra-arc basin, volcanoclastic, Bouguer anomaly, sediment-gravity flows, back arc volcanic, calk alkalin
POLA DAN GENESA STRUKTUR GEOLOGI PEGUNUNGAN SELATAN, PROVINSI DAERAH ISTIMEWA YOGYAKARTA DAN PROVINSI JAWA TENGAH C. Prasetyadi; Ign Sudarno; VB. Indranadi; Surono Surono
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.138

Abstract

The geological structures in the study area are dominated by faults. The rest directions of the faults are northeast-southwest (16 faults) and north-south (14 faults). The remainder of faults are trending in northwest-southeast (3 faults) and west-east (3 faults) directions. Generally, the northeast-southwest and north-south trending faults are dominated by sinitral faults and a few of them are reactivated as normal faults. Whereas the northwest-southeast and west-east trending faults are mainly dextral and or normal faults.Key words: fault, sinitral, normal, and lineament
GEOLOGI BAWAH PERMUKAAN KAITANNYA DENGAN POTENSI PELULUKAN / LIKUIFAKSI DI DAERAH ERETAN DAN LOSARANG, JAWA BARAT U. M. Lumbanbatu; S. Hidayat
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2011): Jurnal Sumber Daya Geologi
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.139

Abstract

The investigated area which belongs to the coastal plain is composed of Quaternary sediments such as soil, swamp, near shore, offshore and pre-Holocene sediments. Further more, near shore sediment can be divided into sand flat, mixed flat, mud flat and beach sand. In general those sediments are still loose and water saturated. Among beach sand, sand flat and mix flat have a high level of vulnerability to liquefied. Based on seismic data, an occurrence of earthquakes can be triggered by two earthquake sources namely subduction sources. An earthquake took place on August 8, 2007 at 04:58 known as Indramayu Earthquake is an example of eartquake triggered by subduction zone since the quake has a depth of 289.2 Km with a magnitude of M 7.5 on the Richter scale. From the geological aspect and seismicity point of view the investigated area is potential for experience liquefaction events. Based on the physical properties of the sand deposits and their stratigraphical position as well as other factors such as a thickness of sand layer, types of overlay and underlain sediments then a liquefaction susceptibility in this region can be divided into very low liquefaction susceptibility region, low liquefaction susceptibility region and high liquefaction susceptibility region.Keywords: quaternary, earthquakes, liquefaction, Inramayu
STRUCTURAL PATTERN AND STRESS SYSTEM EVOLUTION DURING NEOGENE - PLEISTOCENE TIMES IN THE CENTRAL PART OF THE NORTH ARM OF SULAWESI S. Bachri
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 3 (2011): Jurnal Sumber Daya Geologi
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i3.140

Abstract

The study area has been subjected to intense fracturing or brittle deformation resulting in five main trends of lineaments and faults, i.e. (1) the Group A (the Perantanaan Fault Group) with a mean of direction N95°E/ N275°E, (2) the Group B (the Gorontalo Fault Group) with a mean of direction N125°E/ N305°E, (3) the Group C (the Paleleh Fault Group) with a mean of direction 165°E /N335°E, (4) the Group D (the Randangan Fault Group) with a mean of direction N25°E/ N205°E and (5) the Group E (the Kuandang Fault Group) having a mean of trend of N55°E/ N235°E. The complexity of structural pattern in the study area has been interpreted to be due to stress system evolution during Neogene - Pleistocene. The changing stress system orientation has reactivated the preexisting faults of the five groups with different sense of movements from the older deformation.The nearly E-W trending lineaments of Group A or the Perantanaan Fault Group coincide with trend of the long axis of ridges and valleys or depression areas which are covered by volcanic rocks, lake deposits, and alluvium of Quaternary age. This group of structures was presumably developed as reverse or thrust faults during Late Neogene which later on to have beem reactivated as normal faults due to extensional tectonics of the North Sulawesi area during Plesitocene.The Gorontalo Fault, as a part of the Group B (the Gorontalo Fault Group), generally has been interpreted as dextral wrench fault. The present structural analysis suggests that this major fault was formerly developed as a dextral fault during Neogene, and later during Pleistocene it was reactivated in the sense of sinistral fault due to the changing of the stress system. The Neogene stress orientation is supposed to be related to the subduction of the North Sulawesi Sea to the south, which during Pleistocene weakened as the Sangihe Subduction in the Mollucas Sea to the east commenced resulting in the change of field stress orientation.Key words: Structural pattern, stress system, Neogene - Pleistocene, north arm of Sulawesi
PERKEMBANGAN LUAS LINGKUNGAN PENGENDAPAN SEDIMEN PLISTOSEN AKHIR HINGGA HOLOSEN DI DATARAN ALUVIAL RENGASDENGKLOK DAN SEKITARNYA, KAB. KARAWANG (JAWA BARAT) H. Moechtar; Subiyanto Subiyanto; H. Samodra
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 3 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i3.141

Abstract

Study of area development on depositional environments during the Late Pleistocene to Holocene in the alluvial plain of Rengasdengklok surroundings, Karawang Regency (West Java) based on sedimentology and stratigraphy aspects. The study was based on analyses of nine borehole informations obtained along the West to East with the thickness of sediments varied from 6.75 to 10.20 m.Study on Quaternary deposits from boreholes , revealed four depositional environments. These are swamp, floodbasin, floodplain, and river channel environments. Based on correlation of the lateral and vertical variation of the sediment bodies, three Interval of Deposition Periods were recognised. Each of the interval is characterized by increasingly and decreasingly of environments which was controlled by climatic changes and tectonic. The climatic changes were recorded as (1)minimum climate into climatic optimum under warming conditions during deposition of Interval of Deposition Period A into the middle of Interval of Deposition Period B, and (2)optimum climate into climatic minimum under cooling conditions during deposition the middle of Intreval of Deposition Period B into Interval of Deposition Period C. The tectonic activities which controlled the deposition processes were recorded as two stages. These were the change posisiton of river channel deposits 1 to river channel deposits 2 and shifting of river channel deposits 2 into Recent Citarum river (river channel deposits 3).Key words: Sediment, depositional environemnt, climate, tectonic, Rengasdengklok

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