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Sekretariat Redaksi Jurnal Geologi dan Sumberdaya Mineral Pusat Survei Geologi, Badan Geologi, Gedung A, Lantai 1 Jalan Diponegoro No. 57, Bandung, Indonesia
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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Pusat Survei Geologi
ISSN : 08539634     EISSN : 25494759     DOI : https://doi.org/10.33332
Core Subject : Science,
Chemistry Earth & Planetary Sciences Energy
The JGSM acts as a publication media of high quality scientific investigations resulted from various geological scientific issues. Published articles covers Geo-sciences, Geo-resources, Geo-hazards, and Geo-environments. Geo-sciences are basic earth sciences in geology, geophysics, and geochemistry. Geo-resources are applied earth sciences scoping in geological resources. Geo-hazards are applied earth sciences concerning in geological hazards. Geo-environments are applied earth sciences focusing in environmental geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 482 Documents
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RESPON SISTEM FLUVIAL TERHADAP PERUBAHAN IKLIM PLISTOSEN AKHIR-HOLOSEN TERKAIT SIKLUS MILANKOVITCH (Studi kasus geologi Kuarter berdasarkan aspek sedimentologi dan stratigrafi di dataran rendah pantai Pekalongan, Jawa Tengah) Herman Moechtar; Herman Mulyana
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i5.175

Abstract

The study consist of sedimentology and stratigraphy analyses of fiveteen boreholes along the NW-SE and N-S, starting from near shorelines to the southern area. The depth of bore hole varies from 9.25 to 14.80 m. The Late Pliestocene-Holocene sediments in the studied area have been correlated, using ceoss section in 1:100 scales. The sediments consist of offshore, nearshore, beach, swamp, river channel, and floodplain deposits. The study is focused in the river channels. The changing vertically and laterally of river channel show the effects of climate and tectonic. During fluvial systems (IP II and IP III) depositional process, show climatic changes on Milankovitch cycles involving a stage episode from the middle of sub-humid (D2/ late warming) to the late sub-humid (B1/ early cooling). River channel shifting due to laterally base level change is influenced by tectonic.Keywords: River channel, climate, Late Pleistocene-Holocene
ANALISIS LINGKUNGAN PENGENDAPAN BATUAN BERUMUR JURA DI KEPULAUAN MISOOL, PAPUA BERDASARKAN FOSIL MAKRO Fauzi Hasibuan
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i5.176

Abstract

Paleoecological analysis and depositional history of the marine Jurassic to Early Cretaceous, Toarcian - Early Berriasian, strata cropped out at the southeast coast and the islets of Misool are discussed. The macrofossil fauna subdivides the stratigraphy of the areas into 4 assemblages. In stratigraphic ascending order these are 1. Bivalve - Ammonite Assemblage with a Bositra ornate, 2. Belemnite – Bivalve Assemblage 3. Ammonite – Bivalve - Belemnite Assemblage and 4. Bivalve - Ammonite- Belemnite Assemblage.Bivalves occur in the whole section of Toarcian - Berriasian, while belemnite made its first appearance in the Early Callovian time and continued to the Cretaceous. The Ammonite plays an important role and is presented only in Assemblages 1, 3 and 4.The paleoenvirontmental deposition of the Jurassic to Early Cretaceous of the Misool Archipelago was likely related to a continental shelf and continental slope of low energy. The presence of a Bositra ornati Sub-assemblage indicates a restricted basinal anoxic condition for a short period in the Aalenian Stage. PaleogeographIcally, the Misool Archipelago in the Jurassic time was likely located at the northern margin of the Gondwana land or at the southern coast of the Tethyan Sea.Keywords : Jurassic, Early Cretaceous, Toarcian, Early Barriasian, Misool
KONDISI GEOLOGI DAERAH RUTENG DITAFSIR PADA DATA GAYA BERAT Tatang Padmawidjaja
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i5.177

Abstract

Ruteng Area was occupied by the gravity anomaly values between 60 to 160 mgal, showing high anomaly between 100 to 160 mgal and basin anomaly indicated by gravity values between 60 to 100 mgal. The high anomalies are associated with a shallow or exposed basement consisting of Kiro Formation. Wuas Basin is interpreted as intermountain basin, meanwhile basins from Ruteng to the southern part are controlled by faults, and the high anomalies at the southern part is presumed to be granodiorite (Tmg). The sedimentary rocks filling the basins are Nangapanda and Bari Formations. Based on the lineament, there are some faults involving Ruteng, Ulumbu, Pocodedeng and Bajawa Faults. AB geological model of the gravity anomaly cross section shows two layer, consisting of lower layer (basement) with density of 2.71 gr/cm3, the second layer is sedimentary rocks with density of 2.6 gr/cm3. Ruteng, Ulumbu, and Pocodedeng faults controlled the swallowing magma of which can function as a heat source of the geothermal system at the studied area.Keywords : gravity anomaly, lithology, faults, geothermal, Ruteng area.
ORIGIN OF CRETACEOUS HIGH MAGNESIAN ANDESITES FROM SOUTHEAST KALIMANTAN Udi Hartono; Raden Isnu H. Sulistyawan
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i5.178

Abstract

High magnesian andesites are found in the Cretaceous Haruyan volcanics in Southeast Kalimantan. The rocks have Mg# 67 – 69, but low concentrations of Ni (44 – 60 ppm), Cr (37 – 411 ppm) and, except two samples of 95UH23C and 96UH23, ratios of Sr/ Y are also low. Geochemical and tectonic studies show that the high magnesian andesites were originated from a subduction zone-type magma similar to that of the most “normal” Haruyan volcanics. Two possible origins of the Cretaceous high magnesian andesites are proposed. First, melting of the mantle wedge above the slab to produce a basaltic magma followed by crystal fractionation, especially olivine and pyroxene, during magma ascent to the surface resulted in a derivative magma with low Ni and Cr concentrations. A collision between the pre-Mesozoic Paternoster platform (microcontinent ?) and the Sundaland continent in the Upper Cretaceous-Lower Miocene might cause the magma ascent to pool immediately in the lower crust-upper mantle boundary. The impending magma then reacts with hot mantle peridotite to produce the high magnesian andesites. Secondly, the high magnesian andesite may resulted from a reaction between silicic magma and hot mantle peridotite. The collision may also cause lower crust melting resulted in granitic magma (? The Hajawa Granite), which then reacts with hot mantle peridotite to produce the adakite-type high magnesian magma, such as samples 95UH23C and 96UH23.Keywords : high magnesian andesites, Southeast Kalimantan, origin
MIKROZONASI KERENTANAN BAHAYA GONCANGAN GEMPA BUMI KOTA PEKALONGAN BERDASARKAN ANALISIS MIKROTREMOR Asdani Soehaimi; Marjiono Marjiono; Kamawan Kamawan
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i5.179

Abstract

Microzonation of Pekalongan is divided into 3 zones: Ground shaking prone zone I, characterized by very high amplification (>9 times), 0.93 – 1.15 second dominant period and soft sediment thickness between of 40.14 – 50.29 m; ground shaking prone zone II, characterized by high amplification (6-9 times), 0.55 – 1.49 second dominant period of second and soft sediment thickness between 23.91 – 65.30 m; ground shaking prone zone III, characterized by intermediate amplification (3-6 times), 0.47 – 1.54 second dominant period, and soft sediment thickness between 20.73 – 67.31 m.In generall, Pekalongan has amplification between 3, 17 – 12, 91 times. More than 50 % of its area has high amplification, some small spots/areas have very high amplification, and the rest area have intermediate amplification.Microzonation is as the preliminary step for earthquake risk mitigation efforts.In order to reduce the hazard risk, the local government must have policies on spatial planning. Regions which have high – very high amplification need to be developed with specific construction.Keywords: Pekalongan, microzoantion, amplification and predominant period
ANALISIS BENTANG ALAM KUARTER DAERAH CIREBON BERDASARKAN GENESANYA Suyatman Hidayat; Ungkap M Lumbanatu
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i6.180

Abstract

The research is to study geomorphology of Cirebon area to understand its genetic process. A remote sensing analysis and field observations resulted in seven landform units. These are, Marine Origin, Fluvio-Marine, Fluvial, Volcanic, Fluvio-volcanic, Denudated, and Structural Origin. It reveals that development of landscape features of the investegated area was strongly affected by marine and fluvial processes.Keywords: landscape, landform, marine, river
MEDAN GAYA BERAT DAN MODEL GEODINAMIKA DI SEKITAR KEPULAUAN KAI DAN KEPULAUAN ARU, MALUKU Budi Setyanta
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i6.181

Abstract

A gravity measurement was done to study geodynamic model in Kai and Aru islands. Bouguer anomaly in Kai-Aru region can be separated into two groups namely, western part of anomaly group with slighth up and down sharp gradient and the eastern part of anomaly group which is slightly smooth. Both groups of anomaly range from -180 mgals to 200 mgals and is interpreted that the lithologies in that area are underlain by continental crust. A geodynamic hypothesis around Kai-Aru islads based on subsurface gravity model shows that the Kai islands are constructed by thrusting mechanism whereas the Aru islands are by drifting mechanism and followed by gravitational tectonic mechanism. Both mechanism are influenced by changing mechanism from compressional to extentional tectonic regime.Key words : Bouguer anomaly, tectonic mechanism, geodynamics, Maluku
ANALISIS BAHAYA GEMPA BUMI LENGAN UTARA SULAWESI Santoso Santoso; Asdani Soehaimi
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i6.182

Abstract

The Megatrust and Benioff subduction seismic sources of the Sulawesi Sea Micro Plate subducted at 100 km beneath of North Sulawesi's Arm have significant effect in radius of 150 km in this peninsula. The Deterministic Seismic Hazard Analysis-DSHA from megathrust seismic source zone using attenuation function model of Young et al (1997) to the Manado City result in 0.22 g, equal to VIII MMI. Microzonation efforts in this region are conducted in order to mitigate future seismic hazards.Keyword: Seismic hazard, attennation function, Maximum Credible Earthquake (MCE) and Maximum intensity
FLUID INCLUSION CHARACTERISTICS OF AURIFEROUS ARINEM AND BANTARHUNI QUARTZ VEINS, ARINEM, WEST JAVA, INDONESIA Euis Tintin Yuningsih
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i6.183

Abstract

A microthermometric study of fluid inclusions were carried out on the samples from the epithermal gold-silver-base metal mineralization of Arinem and Bantarhuni veins of Arinem deposit from different levels, stages and minerals types (quartz, sphalerite and calcite) to understand the characteristics of the fluid inclusions trapped, and to determine the physical and chemical environments of ore mineral deposition. The results of primary fluid inclusions measurement of stages I and II of main ore mineralization revealed that Arinem and Bantarhuni quartz veins are in the average range of 194.0º–267.3ºC, and sphalerite samples are 194.1º–241.2ºC. The measurement indicates a general decrease of temperature with decreasing depth and an increasing paragenetic time. The evidence of boiling was measured from substage IA of the Arinem vein with the filling temperatures of these inclusions range from 216.8º–247.3ºC. Under such condition, with an average fluid density of 0.861 g/cm3 and a pressure of about 21.7 bars, the paleo-depth would have about 235 meters. Fluid inclusions assemblages from main stages I and II from all levels commonly show a narrow range in Tm values (0.18–4.43 wt.% NaClequiv.). This is also marked in fluid inclusions assemblages from late stage (stage III) of barren quartz (0.35–3.87 wt.% NaClequiv.). Raman spectroscopic analyses of CO2, N2, H2S and CH4 on selected fluid inclusions of the Arinem vein samples, shows no volatile components other than H2O.Keywords: Arinem, Bantarhuni, fluid inclusion, microthermometry, quartz, salinity.
PATAHAN AKTIF DAN KEGEMPAAN DAERAH PLTA CIRATA - SAGULING DAN SEKITARNYA Asdani Soehaimi
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i6.184

Abstract

Electric Hydro Power of Cirata (PLTA) and Saguling are located at the active thrust fault of Citarum – Cisomang (1) and Saguling (2). The gravity modelling on the north – south direction, shows these structures geology as the bounderies of the structural basin of Cirata and Saguling which are filled by Young Volcanic Deposites. Microearthquakes at the Saguling (I), Cirata (II) and Pasir Cabe (III), have the depth of < 10 Km and shown the thrust, strike slip and normal fault focalmechanisms. The maximum magnitude calculated which was based on the vertical displacement (dip slip) of two main revers fault above are 7 Ms with return period of 80 years.Keywords: active fault, maximum magnitude, return period, Cirata

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