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Indonesian Journal on Geoscience
ISSN : 23559314     EISSN : 23559306     DOI : -
Core Subject : Science,
The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to internationalize the journal, The Indonesian Journal on Geoscience, which is open for papers of geology, geophysics, geochemistry, geodetics, geography, and soil science. This new born journal is expected to be published three times a year. As an international publication, of course it must all be written in an international language, in this case English. This adds difficulties to the effort to obtain good papers in English to publish although the credit points that an author will get are much higher.
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Articles 5 Documents
Search results for , issue " Vol 2, No 2 (2007)" : 5 Documents clear
Determinasi sumber tekanan dan analisis regangan utama di Gunung Api Papandayan untuk mengetahui korelasi dengan kegempaan Suganda, Ony Kurnia; Sarsito, Dina Anggreni; Abidin, Hasanuddin Zaenal; Kusnandar, Aris
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.2.73-86

Abstract volcano is located in the southern part of Garut regency, about 70 km southeast of Bandung, West Java. Monitoring the activities of Papandayan volcano has been done using various methods both continously and periodically, one of them is deformation method using repeated GPS (Global Positioning System) survey. GPS survey method is basically used to obtain the pattern and speed of the deformation body of the volcano, both in horizontal and vertical directions and also could be used to determined the location and size of the strain source of deformation based on Mogi model. By describing the shallow seismic activities before and after the eruption, this could show us the correlation of deformation characteristic and its seismic activities. By the result of eight GPS campaigns show that the deformation acceleration is running rapidly, where the fluctuation of shallow seismic activities are directly followed by inflation and deflation of volcano body. Pressure source movement running up and down to southwest-northeast direction. This correlation will lead us to the more comprehensive phenomena of a volcanic eruption, especially in Papandayan volcano.  
Korosifitas air terhadap fondasi beton, kasus di daerah Tapin, Kalimantan Matahelumual, Bethy Carolina
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.2.69-72

Abstract means damaged metal or rust and it could cause explosion in industrial boiler, broken pipe, or stucked gun. Survey result shows that corrosion does not only occur on metals but it may form on building’s concrete. Some factors enable to form corrosion are temperature, dissolved salt, and microor- ganism activity.Corrosivity is influenced by the existence of low pH (concentration of Hidrogen ion), agressive CO , ammonium (NH +), magnesium (Mg+2), and sulphate (SO -2), and pH is the main factor for being concerned of corrosivity. The corrosion may begin to form at water pH of 4.5; the lower pH of water, the faster it forms.On July 2002, the area of KUD Makmur, Tambarangan village was chosen for corrosion study of concrete. Six water samples were analyzed for identification of some chemical elements which influenced the concrete corrosion. Analysis result exhibited that the water had acid characteristics with pH of 3.8-5.1, and the main compounds were CO , NH +, Mg+2, and SO -2; showing that the water ranged of high to very high corrosion character.A special water treatment needs to do in increasing the quality of water, so that the water could be used for foundation concrete, or to prevent corrosion by coating the inner surface of pipe by carbonate. Some parameters in building of foundation should consider such as firstly on planning, followed by environment data collection, and then building process, choosing equipments and maintenance.
Hubungan antara diagenesis, reflektan vitrinit, dan kematangan batuan pembawa hidrokarbon batuan sedimen Miosen di Cekungan Bengkulu Heryanto, Rachmat
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.2.99-111

Abstract Early-Middle Miocene Seblat and Middle-Late Miocene Lemau Formations are two of sedimentary rock lithstratigrphic unit that occur in the Bengkulu Basin. Lithologically, the Seblat Formation consists of mudstone with some interbedded sandstones and conglomerate in the lower part and tuffaceous mudstone with some limestone lenses in the upper part. The Lemau Formation, however, comprises dominant sandstones with interbedded shales and sub-ordinate conglomerates and mudstone beds in the lower part, and mudstone with sandstone intercalations and coal seams in the upper part.Hydrogen Index (HI) versus Temperature Maximum (T) diagram shows that the source rock maturation at most of the samples is late immature to early mature. The vitrinite reflectance the dispersed organic matter (DOM) ranges from 0.37 to 0.55%; whereas of the coal seam ranges from 0.76 up to 0.94%. This indicates that the source rock maturation is defined to be late immature to early mature. The data indicate a burial history for about 2,500 m in depth, where the paleotemperature reached 80o C.Diagenetic processes observed from the Seblat and Lemau Sandstones are compaction, the forming of authigenic minerals and secondary porosities. The diagenetic stage includes the mesogenetic mature A, which equivalent to mudrock stage II, with the paleotemperature of 80o to 95o C, and the burial thickness of 2 to 3 km.There is a relationship between diagenetic stage, vitrinite reflectance, and maturation of organic matter of hydrocarbon source rock, caused by the burial depth.  
Kemungkinan sebaran zirkon pada endapan placer di Pulau Kalimantan Herman, Danny Zulkifli
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.2.89-97

Abstract alluvium with valued heavy minerals originated from regions of continental shelf, from which recycle process for stable minerals play an important role in transportation and final concentration formation of the minerals. Kalimantan Island as part of continental shelf has a great opportunity to provide condition or environment for placer deposition with zircon content due to: comprising particularly basement rock of calc-alkali to alkali series (granite, granodiorite, tonalite and monzonite) which were suggested as the main supplier sources of zircon; having a long period of regional stability as main contribution in continuation processes of weathering, transportation and forming deposition environment of alluvium and located within a tropical climate with high humidity from which mechanical and chemical weathering processes play an important role in releasing zircon from its source rocks. Continental placer deposit of fluvial sub-environment category is suggested to have possibility to form deposition zone lying between the mountains and the seas, reaching over wide areas and forming huge volume reservoirs with content of zircon. Based on zircon identification (associated with gold or diamond) of placer pan concentrates at some areas of West Kalimantan and Central Kalimantan, these have proved how widespread of zircon deposition within fluvial sub-environments in both regions. This important information inspires an opportunity to do exploration of placer zircon deposits within fluvial sub-environments in entirely Kalimantan Island, without neglecting to the transition placer of strandline sub-environment category and marine environment which enable to have an economic deposit of zircon.  
Penentuan status mutu air dengan sistem STORET di Kecamatan Bantar Gebang Matahelumual, Bethy Carolina
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.2.113-118


Water is needed for human life, animals and plants. It can be used as media of transportation (rivers and sea) and energy resources. In Indonesia, groundwater is used for drinking water. Besides the advantages, water could cause disadvantages such as flooding.Intensive exploitation groundwater will cause negative impact prior to degradation of water quality, and its local water surface. The water qualities depend on the environmental conditions. If ecosystem is maintained in balance, it will create natural aquatic cycle.In 2002, study of the water quality was carried out at Bantar Gebang Sub District. The result compared to the STORET System of Environmental Protection Agency (EPA) shows that bad quality of water was caused by its environmental condition and the recent waste disposal site of Bantar Gebang.

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