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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.

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Articles 796 Documents

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Hubungan Kumpulan Mineral Berat pada Sedimen Pantai dan Lepas Pantai dengan Batuan Asal Darat di Perairan Teluk Pelabuhan Ratu, Jawa Barat Setiady, Deny
Indonesian Journal on Geoscience Vol 5, No 1 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i1.93Based on the depth contour, the sea bottom morphology in southern part of the researched area is very steep, while in the northern area it is sloped slightly. It shows that sedimentation process is from south to the north and continues to the west. It is supported by the current process in studied area. Rock slope stability of hilly morphology in the Cimandiri River area is related to weathering, erosion, and transportation process in coastal and nearshore areas. The presence of mineral in the studied area caused by those processes, was accumulated in the mouth of Cimandiri River, coastal, and nearshore areas. Those minerals were deposited in Cibelendung to Karangbeureum nearshore area by the longshore current. Magnetite and pyroxene minerals are dominant along the coastal and offshore areas of Pelabuhan Ratu Bay. The presence of augite and diopside shows that the source rock is basic igneous rocks (basalt), while the presence of hornblende and biotite minerals tend to indicate that the source rock is intermediate igneous rocks (andesite).

Ciri Geokimia Batuan Vulkaniklastika di daerah Tanjung Balit, Sumatra Barat: Suatu Indikasi Kegiatan Magma pada Eosen Harahap, Bhakti H.
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i2.94Volcaniclastic rocks exposed in the Tanjung Balit area, West Sumatra, are red in color, loose, soft, and fractured. The rocks are strongly altered to be clay with calcium (CaO) and natrium (Na2O) contents extremely low (0.02 and maximum 0.30wt% respectively), and high loss of ignition (LOI) (4-15wt%). Mobile minor elements such as strontium (Sr), rubidium (Rb), and lanthanum (La) are also changed as their values do not fit to a normal contents range of fresh volcanic rocks in general. Geochemical analyses of the rocks resulted in the following oxide values: silica (SiO2) ranges from 58 â 68wt%, alumina (Al2O3) 15,90 â 21,46wt%, magnesium (MgO) 1, 36 â 1.61wt%, iron oxides (Fe2O3) 4,8-6,9wt%, potassium (K2O) 2,73 - 4,23wt% and titanium (TiO2) 0,60 - 0,70wt%. In general, the element contents especially the immobile ones (Ti, Mg and Fe) show that the rocks were originated from magmatic activity, which is also supported by petrographical characteristics that are still showing felspar and quartz minerals relicts. Based on SiO2 versus K2O diagram, these rocks are classified as high K-calc-alkaline series and belong to an intermediate composition. The rocks of the above criteria such as high alumina, very low magnesium and less than 1% titanium are one of the evidences that they are a magmatic arc product. The trace element of the rocks is summarized on the spider diagram; here their patterns strongly resemble to the typical of magmatic arc as well with enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE) relative to high field strength elements (HFSE) and heavy REE (HREE). Trace element pattern and REE suggest they were originated from a high K- calc-alkaline magma source.

Model Starlet, suatu Usulan untuk Mitigasi Bencana Longsor dengan Pendekatan Genetika Wilayah (Studi Kasus: Longsoran Citatah, Padalarang, Jawa) Zakaria, Z.
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i2.95Scientists, governments, employers, and communities have the same view on landslide disasters, that is the need to cut losses and to avoid loss of men. To deal with landslide disasters, an understanding of an area is required, especially for mitigation ( limitations and stabilization). To handle the slope - prone to landslides, an integrated approach is needed. A stabilization and integrated design (Starlet model) is a proposal in the handling landslide - prone slopes the integration among: (1) mapping system, (2) slope stability analysis, (3) simulation design of stable slope, and (4) guidance with environmental management along with monitoring. In addition, this also requires the participation of scientists, government officials, communities, and employers in facing these avalanche disasters. Citatah landslides formed a system with the largest to the smallest sizes that is a unity. The landslide in the western part of Pasir Pabeasan (Pasir Pabeasan - Citatah) is a complex one with the type of lateral spread. There are other landslides in the surrounding area, i.e: rock fall, rock toppling, slump, debris slide, and slide. The landslide shows the system and dimensions of landslide from the smallest to the largest one. Slopes in 22.29o to 44.28o should be noted because in general they are critical. They need stabilizations. Landslide area mapping system should consider the genetic region. A terrain genetic map will show areas of terrain genetic unit (TGU) which strongly supports the zoning maps of land movements. Based on terraingenetic unit (TGU), the Citatah landslides are common at symbol TGU 2331, 2232, locations between 2231 and 2331, locations between 2232 and 2331, and locations between 2233 and 2331, around the intersection of two faults (Cimandiri thrust fault cut by dextral strike - slip fault).

Tren kenaikan suhu permukaan laut pada abad ke-14 berdasarkan data geokimia Sr/Ca dari fosil koral Mentawai Cahyarini, Sri Y.
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i2.96Sr/Ca content ratio in coral is a promising tool for a sea surface temperature reconstruction. In this study, Sr/Ca was analyzed from the top core of fossil coral from Central Mentawai, Indonesia (BLS). The dating of U/Th is used for the age determination of the fossil coral. Based on the U/Th dating, the fossil coral used in this study was deposited in 14th century which approximately has a time range 11 years. The result of this study shows that in the 14th century, the sea surface temperature increased by 3.20 C during 11 years period.

Distribusi lapisan batuan sedimen yang diduga mengandung gas biogenik dengan metode tahanan jenis di Pantai Saronggi, Sumenep, Madura Arifin, Lukman
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i2.97A research on sediments estimated to contain biogenic gas at Saronggi coast Sumenep in Madura, East Java, has been done by using the resistivity method and produced 2-D (two dimensional) cross-sectional along four paths. The results of previous measurements indicate that biogenic gas is present within layers of black shale. It is known that the resistivity values of the black shale bearing biogenic gas is between 0.9-1.3 Ohm m. These resistivity values are used as references to determine the black shale layer bearing gas in four resistivity profiles. The depth of the black shale layers are varies: in profile 1 the depth is between 26.3 and 44.6 m, in profile 2 is between 30 and 45 m, in profile 3 is between 44.6 and 64.8 m, and in profile 4 is between 8,75 and 44,6 m.

Penyebaran dan Karakteristik Zirkon Dasar Laut sebagai Endapan Sekunder di Perairan Singkawang dan sekitarnya, Kalimantan Barat Aryanto, Noor Cahyo; Kurnio, H.
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i2.98The abundance of sea floor zircon mineral in the studied area was found at the southwest of Kabung Island (SKWL-56) which was accumulated in silty sand sediments at 23 m water depth. Based on the grain mineragraphy analysis, this mineral has various characteristics: rose, white, and brownish yellow colours, elongated prismatic crystals, and translucent to transparent appearances. The distribution profile lines have shown that the distribution of seafloor zircon tends to decrease from Kabung and its surrounding areas to Lemukutan, and from Kabung to the Land of Kalimantan. Considering the abundances, distribution, crystal shape, and mineral association, the zircon mineral in the studied area is a placer deposit that was produced by transport processes characterized by the changing form of crystal. Some samples observed, showed corrosion marks due to a transportation activity, while the transparent level change of these minerals was suggested to be due to much penetration into cavities in the mineral, which lead to the presence of gangue material during the deposition process.

Penelitian Magnetostratigrafi dan Penerapan Satuan Stratigrafi Polaritas Magnet sebagai Satuan Kronostratigrafi: Studi Kasus di Cekungan Bandung serta Daerah Mojokerto dan Sangiran, Jawa Sunardi, Edi
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i2.99Palaeomagnetism has a role to make a new stratigraphic nomenclature based on the earth magnetismÂ of a nonperiodic reversal polarity phenomenon. Since this phenomenon has a global impact, it can beÂ used as a potential correlation, known as the Magnetic Polarity Chronostratigraphy Unit. RemanentÂ magnetism direction having reversal polarity against present earth magnetic field has long been knownÂ since early palaeomagnetic studies. Modern development of geomagnetic polarity time scale (GPTS),Â initiated in early 1960âs has followed the advancement of radiometric dating which is more accurate.Â A palaeomagnetic record obtained in the past of 3 Ma of rock in the Sangiran Area, East Java, hasÂ contributed in making a correction of previous magnetostratigraphy researches as well as a new levelÂ stratigraphy boundary and a new event of geomagnetic polarity. Based on the correlation record ofÂ secular variation in Mojokerto and Sangiran, the magnetostratigraphy of formations of Pleistocene ageÂ at Mojokerto has been arranged. The geomagnetic polarity stratigraphy of the past 4 Ma of the rocksÂ in the Bandung Basin and its surrounding areas can be used as a guidance of isochronous position inÂ the stratigraphy correlation.

Model Mineralisasi Pembentukan Opal Banten Ansori, Chusni
Indonesian Journal on Geoscience Vol 5, No 3 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i3.100Opal is a beautiful precious gemstone that is equal or more valuable than diamond. In Indonesia, precious opal is found at the Lebak Regency, Province of Banten. Bantenâs opal widely has been recognized due to its beautiful opalescence. This paper is a review of the last research; preliminary study of Bantenâs opal, characteristics of opal-CT and determining of opal type from geochemical data, added by new data to compile concept and to make mineralization model. In order to fulfill these targets, field geology research and analysis of mineralog/gemology, petrography, X-RD, and major and trace element geochemistry have been done. The Bantenâs opal is opal-CT showing opalescence (play of colour), weathering, and leaching silica from volcanic glass by dark grey claystone hosted. Mineralization model is divided into three periods; at Early Pliocene volcanic clastic sediments rich in volcanic glass occured as fluvial sediments. Afterwards, at Late Pliocene - Pleistocene folding, weathering and leaching of silica took place. Intensive jointing, faulting, and folding quickened weathering and leaching processes to formed opal at limb of anticline through Holocene. The prospecting area of Bantenâs opal is in tuff unit with intercalation of conglomerate or pumiceous breccia, at limb of anticline. The host rock of opal is dark grey claystone which underlies polimict conglomerate/pebbly sandstone sequence with cross stratification, imbricated, and erossional stucture; more than 8 m deep.

Makrozonasi dan Mikrozonasi Kerentanan Bencana Gempa Bumi di Wilayah Ende sebagai Data dasar Perencanaan dan Pengembangan Wilayah Saputra, Sukahar Eka; Suhaimi, A.; Mulyasari, F.
Indonesian Journal on Geoscience Vol 5, No 3 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i3.101The application of macrozonation and microzonation on earthquake hazard susceptibility for zoningÂ regulation in the regency and city levels, is one of the activities of joint technical cooperation between theÂ Geological Agency, Ministry of Energy and Mineral Resources and the German Federal Institute for GeosciencesÂ and Natural Resources (BGR) which involved the local government of Ende. Macrozonation ofÂ the Ende Regency contains a basic information of seismotectonics which consists of geological conditionsÂ (geomorphology, lithology, structural geology, and neotectonics) and seismicities (epicenter distribution,Â focal mechanism, earthquake source zones, and accelerations of hard, intermediate and soft rocks asÂ well as their maximum intensity). On the other sides, it includes administrative boundaries and potentialÂ earthquake hazards as well as its collateral hazards when the earthquakes occurred. The research in theÂ city area was a microzonation parameters of amplification, predominant period, and susceptibility indexÂ of earthquake hazard and its combinations. These important parameters can be used as spatial planningÂ data for an earthquake risk assessment at each zone based on it own susceptibility degree.

Penafsiran Struktur Geologi Bawah Permukaan di Kawasan Semburan Lumpur Sidoarjo, Berdasarkan Penampang Ground Penetrating Radar (GPR) Budiono, Kris; HandoKo, HandoKo; Hernawan, U.; Godwin, Godwin
Indonesian Journal on Geoscience Vol 5, No 3 (2010)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v5i3.102The Ground Penetrating Radar (GPR) survey has been carried out around the Sidoarjo mud eruption. TheÂ aim of the survey is to see how far the development of shallow subsurface geological condition related to theÂ eruptions that frequently occur around the main eruption. Ground Probing Radar is one of the geophysicalÂ method which is developed as a tool for a relatively shallow and detailed subsurface geological survey.Â The use of GPR method is not different with the seismic reflection method. The penetration depth of GPRÂ method depends on electric properties of subsurface geological condition such as electric conductivity andÂ dielectric constant. Both of these properties are related to physical properties of soil or rock such as waterÂ content and salinity. The result of the survey shows that at a shallow depth the geological structure such asÂ fold, fault, and joint is frequently seen. Based on these results, the GPR method is very useful to decide theÂ indication of potential area of small mud intrusion, so that the result can be used to help the mitigation plan.

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Home Page

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Contact Name Ivan Ferdian

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Contact Name
Ivan Ferdian

Contact Email
ivan.ijgbg@gmail.com

Phone
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Journal Mail Official
ivan.ijgbg@gmail.com

Editorial Address
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Location
Kota bandung,

Jawa barat

INDONESIA