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IJOG : Indonesian Journal on Geoscience

IJOG
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Published by Geological Agency of Indonesia

ISSN : 23559314 EISSN : 23559306 DOI : -

Core Subject : Science,

Earth & Planetary Sciences

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.

Arjuna Subject : -

Articles 796 Documents

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Korosifitas air terhadap fondasi beton, kasus di daerah Tapin, Kalimantan Bethy Carolina Matahelumual
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no2.20071Corrosion 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.

Determinasi sumber tekanan dan analisis regangan utama di Gunung Api Papandayan untuk mengetahui korelasi dengan kegempaan Ony Kurnia Suganda; Dina Anggreni Sarsito; Hasanuddin Zaenal Abidin; Aris Kusnandar
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no2.20072Papandayan 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.

Kemungkinan sebaran zirkon pada endapan placer di Pulau Kalimantan Danny Zulkifli Herman
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no2.20073Most 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.

Hubungan antara diagenesis, reflektan vitrinit, dan kematangan batuan pembawa hidrokarbon batuan sedimen Miosen di Cekungan Bengkulu Rachmat Heryanto
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no2.20074The 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.

Penentuan status mutu air dengan sistem STORET di Kecamatan Bantar Gebang Bethy Carolina Matahelumual
Indonesian Journal on Geoscience Vol 2, No 2 (2007)
Publisher : Geological Agency

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.

Kemungkinan keterdapatan hidrokarbon di Cekungan Bengkulu Rachmat Heryanto
Indonesian Journal on Geoscience Vol 2, No 3 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no3.20071The Bengkulu Basin is known as a typical fore-arc basin, situated in the southwest of Sumatera Island. The basin was occupied by the Eo-Oligocene equivalent Lahat Formation that is unconformably overlain by the Oligocene-Miocene volcanic rock of Hulusimpang Formation. It is then succeeded by siliciclastics and few carbonates of Early-Middle Miocene Seblat Formation. Unconformably overlies the Seblat Formation is siliciclastics of the Middle-Late Miocene Lemau Formation, followed by the Late Miocene-Pliocene Simpangaur Formation. The deposition was ended by a typical volcanic rock of the Bintunan/Ranau Formation. The results of sedimentary rock and organic petrographic, scanning electron microscopic and geochemistry (TOC & rock-eval and gas chromatography) analyses conducted on several selected surface outcrop samples and some oil seepage samples collected during the field work, indicate that hydrocarbon is possibly present in the Bengkulu Basin. A source rock possibly occurs in fine-grained carbonaceous sediments of the Seblat and Lemau Formations. The reservoir rock is possibly the sandstone bed of the Lemau Formation and the sandstone and limestone beds of the Seblat Formation. The caprock is a claystone bed present within the Seblat Formation as well as in the Lemau Formation. The hydrocarbon trap probably occurs as stratigraphic and structural types.

Interpretasi Mineralisasi Epitermal Berdasarkan Studi Ubahan Hidrotermal dan Tekstur Urat Kuarsa di Kawasan Hutan Lindung Taliwang, Nusa Tenggara Barat Danny Zulkifli Herman
Indonesian Journal on Geoscience Vol 2, No 3 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no3.20072Taliwang conservation forest, West Nusa Tenggara, is particularly covered by volcanic rocks consisting of alternated breccia and tuff. The breccia is composed of andesitic – dioritic clasts and matrix of fine-grained to lapilli tuff which had partially been hidrothermally altered and invaded by gold bearing quartz veins. Outcrops of quartz veins are commonly limonitized, trending nearly east-west and north-south with respectively dip of 70o and 85o. Identification of quartz veins originated from people mining’s waste leads to a prediction that there are quartz stockworks beneath the earth surface (50 – 100 m depth) in the conservation forest area, from which quartz veins penetrated the illite-paragonite-calcite-siderite- nacrite altered country rock. Textures of quartz veins were identified such as comb with some coarse- grained euhedral crystals, sugary/saccharoidal/fine grained crystalline quartz and ghost-bladed. Veins and host rocks generally contain disseminated and spotted pyrites. Evaluation of quartz textures, altered rocks analysis (PIMA method), fluid inclusion studies and chemical analysis (AAS method) of selective altered rocks/quartz vein samples exhibits that the alteration and mineralization processes might occur in an epithermal system, connecting with a change of hydrothermal fluids from near neutral into acid conditions at a temperature ranging from 231 to 185oC. Alteration of illite-paragonite-kalsit-siderite is suggested as a result of reaction between host rock and a near neutral fluid, whilst nacrite (kaolin group) or argillic is a result of reaction between host rock and an acid fluid, within a mixing zone of meteoric fluid and condensed acid gas released during boiling process of hydrothermal fluid in the depth. On the basis of salinity ranging from 0.9 to 2.2 equivalent wt.% NaCl of fluid inclusion, it is predicted that the deposition of gold bearing quartz and associated ore minerals takes place in a depth ranging from 293 to 120 m beneath paleosurface.

Asal-usul Pembentukan Gunung Batur di daerah Wediombo, Gunungkidul, Yogyakarta Gendoet Hartono; Sutikno Bronto
Indonesian Journal on Geoscience Vol 2, No 3 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no3.20073Physiographically, the Gunung Sewu Subzone is predominantly composed of limestone of the Wonosari Formation, but in Wediombo area volcanic rocks of the Wuni Formation is exposed. The Wediombo volcanic rocks contain lava flows and volcanic breccias associated with Batur intrusive rock, in which all the rocks have andesitic composition. The problem is whether the Wedi- ombo volcanic rocks originated from far distance area which then was intruded by local magma after its deposition, or it is an association of the Wediombo volcanic and the Batur intrusive rocks which both are the remnants of a paleovolcano in the area. To identify the central facies of the paleovolcano, the geological principle that “the present is the key the past” is used as a geological approach.Wediombo area forms a high landscape showing an elevation of about 280 m above sea level with dips of the outer slopes 20 - 40%. The drainage pattern developing in the area fol- lows the existing circular structure to form subradial - radial patterns. The high landscape shows a circular structure with a diameter of less than 2 km and it opens to the Indian Ocean. Besides the Mount Batur intrusive rock, there are some other dikes which have been already hidrothermally altered, with some mineralization in the circular structure. Meanwhile, the outer slopes are composed of alternating lava flows and fragmental volcanic rocks of 22 - 25o in dip forming a concentric pattern. Petrologically, the Batur intrusive rock is light to dark grey in color, hypocrystalline porphyritic texture, with phenocryst ranges from 1.2 - 2.2 mm in size, subhedral-euhedral crystals, fine vesicular structures. The rock comprises plagioclase, pyroxene, hornblende and opaque minerals. Geochemically, the rock indicates an island arc tholeitic magma (SiO = 60.38 – 64.53 wt%, K O = 0.63 – 0.85 wt%). Those data indicate that the circular structure was the central facies and the outer slope was the proximal facies of the Wediombo paleovolcano in Gunungkidul Yogyakarta.

Evaluasi awal kerentanan pelulukan/likuefaksi daerah Kendal dan sekitarnya, Jawa Tengah Ungkap M. Lumbanbatu; Suyatman Hidayat
Indonesian Journal on Geoscience Vol 2, No 3 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no3.20074The investigated area is a region prone to liquefaction hazards since it consists of loose, saturated Quaternary deposits. The Quaternary deposits were deposited in several sediment environments such as swamp, estuary, near shore, off shore, and fluvial (flood plain, flood basin and paleo channel). Among those Quaternary deposits, the paleo channel and estuary deposits which mainly consist of fine - to medium - sand have high susceptibility to liquefaction. An earthquake-source zone which is able to trigger earthquake and to cause liquefaction hazards is known to be thrust fault and subduction zones. Earthquakes produced by thrust fault activities are classified as shallow earthquakes while earthquakes produced by a subduction zone are deep earthquakes. The investigated area is divided into low liquefaction susceptibility, moderate susceptibility and high liquefaction susceptibility zones. This division has been made based on physical characteristic of the sand deposits, grain size, thickness of sand and its position to groundwater level as well as the physical character of overburden layer.

Gerakan struktur dan kaitannya dengan faktor kendali tektonik, berdasarkan analisis stratigrafi; Studi kasus geologi kuarter terhadap fase perkembangan Danau Tondano purba sepanjang Remboken - Kakas, Kec. Remboken dan Kec. Kakas, Kab. Tomohon, Sulawesi Ut Herman Moechtar; Indyo Pratomo; Herman Mulyana; Soemantri Poedjoprajitno
Indonesian Journal on Geoscience Vol 2, No 3 (2007)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol2no3.20075Studies of stratigraphy on Quaternary deposits in the southwest region of Lake Tondano, Tomohon Regency, South Sulawesi, revealed six facies of deposition environments. These facies consist of Tondano tuff, young volcanic eruption, lake, sand lake, tidal lake, and swamp deposits. Based on the correlation of the lateral and vertical variation of the Quaternary deposits, three unit of the depositional facies were recognized (UFP I-III). Each of the depositional facies unit is characterized by variation of the depositional environment changes which were controlled by tectonics, and was followed by the activity of Sonder main fault. The Sonder main fault activity, which controlled the depositional environment changes was recorded as an UFP. Probably, the character of this stratigraphy could be called as cyclo-tectonostratigraphy. The study was based on analyses of sedimentology and stratigraphy of six borehole information obtained along the E-NW traverse which is approximately parallel to the shorelines of the southwestern part of Lake Tondano. The penetration of the borehead varied from 1.20 to 8.7 m.

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Ivan Ferdian

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Journal Mail Official
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Location
Kota bandung,

Jawa barat

INDONESIA