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INDONESIA
Jurnal Geologi dan Sumberdaya Mineral
Published by Kementerian Energi dan Sumber Daya Mineral
ISSN : 08539634     EISSN : 25494759     DOI : -
Core Subject : Science, Education, Social, Engineering,
Education Energy Engineering Environmental Science
Jurnal Geologi dan Sumberdaya Mineral (JGSM) is an Indonesian scientific journal published by the Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources. The journal receives Indonesian or English articles. Those articles are selected and reviewed by our professional editors and peer reviewers.
Arjuna Subject : -
Articles 6 Documents
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Search results for , issue " Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi" : 6 Documents clear
INDIKASI FENOMENA STRUKTUR GEOLOGI BAWAH PERMUKAAN DAERAH RENCANA TAPAK PEMBANGKIT LISTRIK TENAGA NUKLIR GUNUNG API GENUK DAN SEKITARNYA, JEPARA, JAWA TENGAH Panjaitan, Saultan; Subagio, Subagio
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Generally, gravity anomaly pattern in research area is devided into two groups, high anomaly with the value ranges from 37 mgal to 43 mgal, and low anomaly, varies from 10 mgal to 37 mgal. The high anomaly group might be caused by the existing volcanic Quartenary rocks, and the low anomaly group indicates a sedimentary basin. Based on the result of 3 quantitative analysis, the high anomaly group reflects the existing volcanic Quartenary rocks with density 2.8 gr/cm relatively higher than surrounding. Analysis also shows in the site plan of Ujung Lemahabang the predicted faults are not encountered. The area in radius 5 km from research area, predicted the capable fault not exist in radius 25 km, found two faults ofshore and three faults in western part of investigation area. Keywords : Lemahabang, gravity anomaly, sedimentary basin arc fault
MINERALOGI MATRIKS BREKSI GUNUNG API PLISTOSEN AKHIR – KUARTER BERDASARKAN DATA XRD DI DAERAH LOMBOK TIMUR, NUSA TENGGARA BARAT Maryanto, Sigit; Hasan, R.; Siregar, Darwin A
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Late Pleistocene to Quarternary volcanic rock units of the Kalipalung, Kalibabak, and Lekopiko Formations are well cropped out at East Lombok area, composed predominantly of volcanic breccias. The volcanic breccia of the Kalipalung Formation composed of andesite, porphyry andesite, basaltic andesite, basalt, and altered igneous rocks fragments. The frequence of the occurrence of the andesites and basalts is balanced. The volcanic breccia of the Kalibabak Formation composed predominantly of andesite, porphyry andesite, and rarely basaltic andesite and basalt rock fragments. The volcanic breccia of the Lekopiko Formation composed predominantly of pumice and less of andesite rock fragments, as well as sand and conglomeratic sands. XRD analysis of selected volcanic breccias matrix shows that the plagioclase change from labradorite and andesine on the Kalipalung and Kalibabak Formation to andesine, oligoclase and albite on the Lekopiko Formation. From the old to young formations, the orthopyroxene and clinopyroxene change to orthopyroxene, and finally these minerals was dissapeared. The clay minerals of montmorilonite commomly preserved on the old formation, it dissapeared and replaced by kaolinite in the young formation. Based on the difference test between two means it appears that the Kalipalung and Kalibabak Formations are similar on their mineralogical characters. On the other hand, the Kalipalung Formatian has a real difference on the mineralogical character with the Lekopiko Formation, as well as the Kalibabak Formation with the Lekopiko Formations. Keywords: Earth Lombok, breccias matrix, mineralogy
THE POSSIBILITY OF HYDROCARBON TRAP AND ITS POTENTIAL IN THE NORTH BONE BASIN, BASED ON GEOLOGICAL AND GEOPHYSICAL DATA Siagian, Hari P; Widijono, Bambang Suci
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Based on the analysis of geological and geophysical data, it can be informed that investigated area is the sedimentary Bone basin formed since the beginning of the Tertiary age and developed through Paleogen to the Neogene. The basin is defined as a fore-arc basin underlain unconformable by pre-Tertiary basement rocks comprising metamorphics, volcanics, metasediments (the Laitimojong and Pompangeo Complexes). The hydrocarbon occurrence in Bone Basin showed by gas seeps in the surface are located in Pongko and Malangke villages. Some hydrocarbon traps such as structures and stratigraphy are shown in the seismic profiles. Abundant coarse clastic and limestone deposits such as the fluviodeltaic of Toraja and Lamasi Formations may plays as good reservoir in the basin. claystone within the Lamasi Formation and shale within the Toraja Formation predicted as petroleum source rocks in the area. The seals in the basin considered as the existence of numerous claystone and siltstone horizons within the Bone Bone Formation that is also indicated by the drilling results. Keywords : sedimentary basin, hydrocarbon potential, trap, Bone Basin 
POLA DINAMIKA AIR TANAH DI DAERAH BEKASI BERDASARKAN ANALISI RADIOISOTOP 14C Siregar, Darwin A; satrio, Satrio
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

A study of deep groundwater dynamic pattern on the basis of radioisotope 14C analysis has been carried out in the Bekasi  area. Some samples of deep groundwater were collected for14 C analysis. The results were plotted on the locality map concerned and a contour pattern was obtained. The pattern shows that the deep groundwater age of the area south of Bekasi is younger than those of the north and northwest area. This suggests that deep groundwater in the study area flows in the north and northwest directions. Meanwhile, Bekasi area is the recharge area.  Keywords: Bekasi dynamic pattern, deep groundwater, 14C analysis 
INTERAKSI FAKTOR KENDALI TEKTONIK, PERMUKAAN LAUT DAN PERUBAHAN KLIM DI DAERAH TELUK KLABAT, KABUPATEN BANGKA INDUK, BANGKA Hidayat, S.; Moechtar, Herman
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The study of the Quarternary deposits in Klabat gulf areas was based on the analyses of the sedimentology and stratigraphy of fifteen borehole information obtained along west to east. The penetration of the bore head varied from 3.50 to 16.80 m from + 21 m to - 4 m of sea-level. Whereas, the Quarternary sediments in the studied area can be divided into seven sedimentary environments, consisting of alluvial fan (FKa), swamp (FRw), floodbasin (FCb), deltaic (FDt), sand beach (FPp), nearshore (FLdp), and nearshore to offshore (FLdp to FLlp) deposits. Based on the lateral and vertical sedimentary environment correlations, the Quaternary stratigraphic succession can be divided into four sedimentary intervals (IP I to IV). Each interval is typically for topography and elevation changes which is controlled by changes of the sedimentary environment systems. The controlling main factor of the sedimentary environment system changes was regional and local tectonics. Changes in tectonic regime are important upon a tidal flat sedimentation. Keywords: facies, paleoenvironment, tectonic
MIKROTREMOR DAN PERCEPATAN TANAH MAKSIMUM KOTA MAKASSAR Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Makassar city has a relatively far distance > 50 km to the seismic source zone,but the soft soil condition in this area produced significant amplification of earthquake ground shaking. Therefore, a microzonation study as a risk analysis of local site response is basicaly needed. In this research, the earhquake microzonation map was made based on a soil dinamic characterization of a microtremor investigation. The soil having a long predominant period is more risky compared to that having short period of soil. The dominant period of soil at this investigation was calculated based on horizontal towards vertical spectral ratios (H/V) of microtremors, meanwhile the microzonation map of Makassar City was made based on the variation of a predominant period. The result of calculation shows that the south-western part of Tamalanrea district has the longest predominant period. This predominant period gradually dereases to the eastern part of Makasasar City. Peak ground accelaration studies show the maximum ground accelaration is not defferent between one and the other districts. The maximun ground accelaration belongs to Biringkanaya,Tamalanrea and Manggala districts (58,80 gal, 56,84 gal and 55,86 gal for 500 years) in the eastern part of Makassar City. This ground accelaration value becomes less to the west, because the main seismic source zone of Walanae active fault is located at the eastern part of Makassar City. Keywords: microzonation, microtremor, earthquake source zone, site respons, peak ground acceleration

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