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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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A Measure of Intense in West and Central Java Through Manifestation of River Basin Morphometry Development on Quaternary Volcanic Deposits Febri Hirnawan
Indonesian Journal on Geoscience Vol 4, No 4 (2009)
Publisher : Geological Agency

DOI: 10.17014/ijog.v4i4.88Indications exhibiting active tectonic movements in Java occur in many places, characterized by unstable regions, such as active faults, earthquakes, volcanic eruptions, etc. The results of researches conducted at several areas in West and Central Java on tectonic morphometry developments of river basins both in Quaternary deposits and Tertiary sediments exhibit a degree of active tectonic intensity. Such the researches are very important regarding to the spatial development design that is related to a region of active tectonism that should be well understood by planners for decision making mainly through comprehensive approach, in which the phenomena involved explaining the characteristics of the region as part of an active plate margin. Statistic approach as the chosen methodology had been utilized to gain meaningful conclusions through the verification of hypotheses, which are based on valid and reliable tested data obtained from the fields and satellite imagery. Results of regression-correlation tests between azimuths of river segment and lineaments in both chronostratigraphic systems mentioned earlier are significant with several large values of correlation coefficients r of no less than 0.9. On the other hand, results of t-tests are not a significant difference of means of bifurcation ratio (Rb) and drainage density (Dd) from many to river basins. The results of all tests have verified the effect of active tectonic control on the morphometry development process regarding to river segments and density of drainage patterns development in Tertiary and Quaternary deposits.

Stratigraphy and Tectonics of the Sengkang Basin, South Sulawesi Suyono Suyono; Kusnama Kusnama
Indonesian Journal on Geoscience Vol 5, No 1 (2010)
Publisher : Geological Agency

DOI: 10.17014/ijog.v5i1.89Sulawesi was formed during the Oligocene - Miocene collision between the Eurasian Plate and micro-continental fragments detached from the Indian-Australian Plate. The Sengkang Basin situated on the South Sulawesi Province, was formed by a major north northwest - south southeast trending fault system of the Walanae Fault Zone, which was followed by the formation of Late Neogene foreland basin and syn-orogenic deposition. The fault system separated the eastern and western parts of South Sulawesi and influenced the deposition during the Late Miocene to Quaternary. The lower part of the deposition unit consists of small carbonate reefs of the Tacipi Member occupying the East Sengkang Basin, where this shallow marine facies is intercalated within or overlies marine claystones representing the base of the Walanae Formation. The middle sequence is interpreted as a delta foreset consisting of the Samaoling and Beru Members. During the deposition of these two members, the northern part of the Sengkang Basin gradually changed from a tidal and deltaic to fluvial environments. Furthermore, the upper sequence of this sedimentary unit is dominated by fluvial deposits.

Deformasi Gunung Kelud Pascapembentukan Kubah Lava November 2007 Nia Haerani; M. Hendrasto; H. Z. Abidin
Indonesian Journal on Geoscience Vol 5, No 1 (2010)
Publisher : Geological Agency

DOI: 10.17014/ijog.v5i1.90The eruption of Kelud Volcano in 2007 was started with an increase in the seismic activity on September 2007. It was ended with a lava dome formation inside the crater lake on 3 November 2007. This phenomenon showed the change of eruption behavior compared to the last eruption on February 1990 that was an explosive one. Result from the GPS observation method during three periods, which are: April, August, and October 2008 showed that the vector displacement on each measured point was affected dominantly by structural geology forces as a crustal stabilisation after the last phase of November 2007 eruption. There was also a minor displacement as the result of magma migration around the points that were close to the lava dome. The magma migration occurred in a relatively shallow depth and was associated with an aseismic zone. The deformation that occurred as a result of magma migration toward the surface was calculated to determine the magma supply and magma injected. The result then was compared to illustrate a mechanism of deformation during April – October 2008. The comparison of magma supply and magma injected within these periods showed that the inflation still occurred, but it was not supported by a surface manifestation. This inflation could be false because of data discontinuity, or it is actually a part of deflation trend.

The Triassic Marine Biota of Eastern Indonesia and its Interregional and Global Correlation: A Review Fauzie Hasibuan
Indonesian Journal on Geoscience Vol 5, No 1 (2010)
Publisher : Geological Agency

DOI: 10.17014/ijog.v5i1.91The interregional and global correlation of the Triassic biota of Indonesia was based on the review of previous workers and the author himself. Scythian Epoch (Early Triassic) in Timor is subdivided into Early Scythian with Ophiceras demisso, Meekoceras sp., Pseudomonotis subaurita, Gervillia subpannonica, and Myophoria sp., whilst Late Scythian is indicated by the presence of Owenites egrediens and Sibirites sp. The presence of Anisian Stage (Middle Triassic) in Misool is indicated by ammonite Beyrichites and bivalve Daonella lilintana. In Timor, this stage is pointed out by the presence of Joannites cymbiformis, Monophyllites wengensis, Protrachyceras archaelus, Daonella indica, Tracyceras cf. aon, Brochidium timorense, and Lima subpunctatoides. Terebellina mackayi found above Beyrichites-bearing bed in Misool has an age range from Anisian to Ladinian. It is concluded that the boundary between Anisian and Ladinian lies between beds with Beyrichites and Terebellina mackayi. Early Carnian Stage (Late Triassic) in Timor is indicated by the presence of Joanites cymbiformis, Waldhausenites sp., Miltites sp., and Halogyra cipitiensis; whereas Late Carnian is indicated by the presence of Cladicites crassestriatus and Tropites subbulatus. The presence of Halobia verbeeki, Pinacoceras parma, Neobetites sp., Parabetites sp., Malayites sp., Amarassites sp., and Halorites sp., indicates the Early Norian Stage, whilst the presence of Cladiscites tornatus, Cyrtopleurits malayicus, and Trachypleuraspidites sp. implies the Late Norian. The Rhaetian Stage in Timor contains Choristoceras indoaustralicum, whereas in Misool it contains Choristoceras sp. and Cochloceras sp.

Paleocene postgenetic Accumulation of Nannoplankton on the Phillipsite Minerals in Roo Rise, Indian Ocean Mimin Karmini Adisaputra; Dida Kusnida
Indonesian Journal on Geoscience Vol 5, No 1 (2010)
Publisher : Geological Agency

DOI: 10.17014/ijog.v5i1.92The sample studied was derived from the base of core MD 982156, one of the boreholes obtained during the IMAGES Expedition. The expedition was carried out as a research cooperation between Indonesia and French Governments using Marion Dufresne Research Vessel, belonging to IFRTP (French Institute for Polar Research). Within this sample, the phillipsite minerals were firstly found by the first author. Using SEM (Scanning Electron Microscope) at the magnification of x1,000 for group and up to x20,000 for individual photos, the nannoplanktons were shown to accumulate on the phillipsite minerals as a binding matrix. Different directions and velocity of the bottom current when the phillipsite minerals were originated, might have contributed in binding of the various mineral shapes. The calcareous nannoplankton in the studied area is preserved within the sediments between 3880 m to 3914 m depths below sea level (bsl). This interval possibly located between Lysocline and Carbonate Compensation Depth (CCD), is indicated by the presence of well preserved calcite minerals and calcareous nannoplankton within sediments. Discoaster multiradiatus, the dominant fossil within the sediments in the studied area, is Paleocene in age. Therefore, the binding of nannoplakton accumulation as a matrix of the phillipsite minerals occurred as a postgenetic deposition.

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

DOI: 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 Bhakti H. Harahap
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI: 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 – 68wt%, alumina (Al2O3) 15,90 – 21,46wt%, magnesium (MgO) 1, 36 – 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) Z. Zakaria
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI: 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 Sri Y. Cahyarini
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI: 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 Lukman Arifin
Indonesian Journal on Geoscience Vol 5, No 2 (2010)
Publisher : Geological Agency

DOI: 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.

Page 36 of 80 | Total Record : 796

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Ivan Ferdian

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Contact Name
Ivan Ferdian

Contact Email
ivan.ijgbg@gmail.com

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Journal Mail Official
ivan.ijgbg@gmail.com

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Location
Kota bandung,

Jawa barat

INDONESIA