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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 5 Documents
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Search results for , issue " Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi" : 5 Documents clear
TRIASSIC AND JURASSIC GASTROPODS FROM THE MISOOL ARCHIPELAGO, EASTERN INDONESIA Hasibuan, Fauzie; Grant-Mackie, J.A
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The known gastropod fauna of Triassic and Jurassic ages from the Misool Archipelago is reviewed, based on collections made during a 1981 expedition jointly by personnel from the then-Geological Research and Development Centre, Bandung, and the Australian Bureau of Mineral Resources. The new material includes one new species, Bathrotomaria foronica, from the Yefbie Formation (Aalenian), and two undescribed but probably new species, a Rhaetian ?Angularia from the Lios Member of the Bogal Formation and a Purpurina of Aalenian or jBajocian age from the Yefbie Formation. In addition, other material from the Rhaetian Lios Member, too poorly preserved for generic identification, is allotted to the Subfamily Neritinae. Some forms recorded by earlier workers were not recollected but have been listed for completeness, giving a total of five described species and a further five in open nomenclature. Most taxa are unique to this area, but one, Eucyclus orbignyanus (Hudleston), is known also from Europe. Keywords: gastropod, Triassic, Jurassic, Misool Archipelago, Yefbie Formation, Lios Member, Bogal Formation
HUBUNGAN LINGKUNGAN PENGENDAPAN FORMASI MALAWA DAN KETERDAPATAN BATUBARA DI DAERAH SOPPENG, SULAWESI SELATAN Kusnama, Kusnama; Andi Mangga, Syahrir
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Lithologically, the Malawa Formation comprises medium to coarse-grained quartz sandstone, shale and claystone in the lower part; and mudstone and carbonaceous fine- grained sandstone in the upper part. The thickness of the Malawa Formation in the Gatareng area is about 100 metres. The lower part of the Malawa Formation was deposited in a fluvial environment occupied by terrestrial vegetation such as land algae, fungus, ferns and mangroves, while the upper part of the formation was indicated by fluviatile close to the beach and sand dunes. On the basis of fossil content, the age of the formation is within the range of Middle Eocene -Oligocene.Several coal intercalations which are characteristically black in colour with good luster of sub-bituminous, were found in the formation with the thickness from 50 cm to 120 cm. Based on the lithology succession and the river stream where the coal deposits were found, coal occurred in the Malawa Formation can be divided into two blocks, Bakeko and Kandangsapi Blocks. Each block has some coal seams with different various rock succession. Keywords: Malawa Formation, Gatareng Area, sub-bituminous, beach environment
PENENTUAN LOKASI SARANA PENGHUBUNG JAWA - BALI (SELAT BALI) SESUAI DENGAN KONDISI OPTIMAL GEOLOGI KELAUTAN Usman, Ediar
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

To decide the preferable location of a bridge or tunnel site connecting Jawa - Bali, marine geological survey on the sea floor of Bali Strait encompassing morphology and geology should be taken into consideration. Depression of 140 meters deep as a result of bathymetrical data recording can be observed. Besides this, the result of reflection seismic record gave a clear interpretation about materials constructing the sea floor, which consists of unconsolidated sediments of coral fragments and sands (such as mounded and slump type). The basement rocks were also found in a narrow basin with cliffs of about 100 to 140 metres deep going north - south direction.  Keywords: marine geology, bathimetry, seismic interpretation, bridge location, Jawa – Bali
TINJAUAN ANALISIS GAYA BERAT TERHADAP BENTUKAN STRUKTUR BAWAH PERMUKAAN DI LEMBAR MEDAN, SUMATERA UTARA Nainggolan, D.A
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Regionally, tectonics of the Medan Quadrangle is occupied by mountainous and back-arc basin zones. Mountainous zone occupies the southwestern of the quadrangles, and is situated in the northwestern part of Kabanjahe, having Bouguer anomaly ranges from -70 to 0 mgals. Zone of back-arc basin occupying more than 50% of the area extends to the east into the Malacca Strait, having Bouguer anomaly ranges from 0 until +20 mgals. The qualitative and quantitative of Bouguer and residual anomalies represent numerous shapes of anticlinal and synclinal structure including faulting system having direction of northwest - southeast. Keywords : mountainous, back-arc basin, Malacca Strait, subsurface structure, Bouguer anomaly
PETROLOGI BATUAN MAGMATIS NEOGEN DAERAH PANGKALAN KOTABARU LIMAPULUH KOTA SUMATERA BARAT H.Harahap, Bhakti
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Neogene magmatic product in Pangkalan Kotabaru region are plotted by using TAS diagram (total alkali versus silica), and they have wide variations of rocks namely basaltic trachy andesite, basaltic andesite and dacite. On diagram SiO2 versus K2O, most of the Neogene andesite and dacite are classified as high-K calc-alkaline and rare normal calc- 2 alkaline and tholeiite, and on AFM diagram the samples are concentrated around the dividing line between calcalkaline and tholeiitic fields. In general, the Neogene volcanic rocks from this area are characterized by high aluminium (Al2O3) that varies from 15.50 - 18 wt%, low MgO (2-5 wt%), alkali (Na2O+K2O) content less than 8 wt% and low TiO2 (<1 wt%). While the trace element of the rocks is summarized on the spider diagram. Here their patterns are showing enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE) relative to high field strength elements (HFSE) and heavy REE (HREE). Moreover, these patterns show an Nb negative anomaly that resembles the typical characteristic of arc volcanism. The geochemical characteristic of the volcanic rocks from this area have lower concentrations of Ba, Sr and La than other active continental margins like the Andes volcanic rocks. Like many other subduction related rocks, this volcanism characterizes a very evolved magma with MgO contents ranging from 1-5wt% and low Mg# (MgO/MgO+FeOtotal) at maximum of 40. The island of Sumatera is on the western side of the Sunda Craton (Sundaland) where India-Australia Oceanic Plate is being obliquely subducted beneath the island since Eocene. The Neogene volcanic rocks from Pangkalan Kotabaru region have been interpreted to be directly related to this subduction process. Key words: magmatism, geology, Pangkalan Kotabaru, petrology, Neogene

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