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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
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 341 Documents
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KAJIAN PENGARUH GEMPA BUMI MERUSAK DI WILAYAH PROVINSI BENGKULU TERHADAP PLTA MUSI Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 5 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The PLTA Musi is located in a pull apart basin between Ketahun and Musi - Keruh segments of Sumatera fault zone. The geotechnical subsurface of PLTA Musi is divided into four layers involving basement rock layer 1 with N = 1000, Vs =646 m/second; basement rock layer 2 with N = 500, Vs =521 m/second, and thickness h= 12 - 16 m; soft rock layer 1 with N = 200 and Vs = 392 m/second, thicknes h = 6 - 14 m, soft rock layer 2 with N = 100, Vs = 316 m/second, and thickness  h = 10 - 26 m. The natural period (Ts) between based rock layer 1  and 2 is 0,092 second ≤Ts≤ 0,099 second, for based rock layer  2 and soft rock layer 1is  0,06 second ≤ Ts ≤ 0,1 second, and soft rock layer 1 and 2 is0,12 second ≤ Ts ≤ 0,26 second. The 1979 and 1997 Kepahyang destructive earthquakes have significant influences to  the  PLTA  Musi  with  maximum  ground  accelaration  133,59  gal  and  equivalent  intensity  VII MMI or  VII MSK.Destructive earthquakes of magnitude Ms = 5 will occur at PLTA Musi at recurrent time of 10 years and earthquake of magnitude Ms = 6, Ms = 7 and Ms = 8 at 40 years, 160 years and 630 years.Keywords: The Musi PLTA,destructive earthquake, earthquake hazard and risk 
Pendugaan Mineral Kromit Menggunakan Metode Induced Polarization (Ip) di Daerah Kabaena Utara, Bombana Sulawesi Tenggara Santoso, Budy; Subagio, Subagio
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 3 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Mineral kromit di daerah Kabaena Utara terdapat pada batuan ultramafik (batuan peridotit) dan endapan aluvial. Untuk mengetahui penyebaran mineral kromit di daerah penelitian maka dilakukan pengukuran Induced Polarization. Induced Polarization merupakan salah satu metode geofisika yang dapat digunakan untuk pendugaan mineral kromit berdasarkan parameter fisis chargeabilitas dan resistivitas batuan. Teknik pengukuran Induced Polarization dilakukan dengan metode Sounding Profilling 2D, dengan metode ini penyebaran mineral kromit secara lateral dan vertikal dapat diketahui. Konfigurasi elektroda yang digunakan dalam akuisisi data IP yaitu Konfigurasi Dipole-Dipole dengan menggunakan alat Res & IP Meter Supersting-R8. Pengolahan data menggunakan program inversi Res2Dinv. Endapan kromit di daerah penelitian terdiri dari endapan primer dan endapan sekunder. Berdasarkan hasil pengukuran Induced Polarization, endapan kromit primer yang terdapat pada batuan ultramafik (batuan peridotit) mempunyai nilai chargeabilitas (221 – 320) msec dan resistivitas (900 – 6000) Ohm.m, sedangkan endapan kromit sekunder yang terdapat pada lapisan pasir yang mengandung gravel dan fragmen batuan peridotit mempunyai nilai chargeabilitas (203 – 270)  msec dan resistivitas (296 – 400) Ohm.m. 
Sifat-Sifat Fisika Batuan Pulau Biak dan Pulau Supiori, Irian Jaya Simamora, W.H
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 5 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The stratigraphical units of Biak, Irian Jaya Quadrangle, scale 1:250.000 consist of the Tertiary volkanic and sedimentary rocks, the pre-Tertiary metamorphics and recent alluvial. The studied area is in Biak and Supiori Islands, Irian Jaya bounded by longitudes 135°45' - 136°23'E and latitudes 0°36' - 1°36'S. Thirty six rock samples from investigated area have been collected and analyzed in a laboratory. The physical characteristics of samples analyzed include density (?), porosity (ô), magnetic susceptibility (?), and velocity of seismic wave ( Vp and Vs ). The result shows that the value of densities are within the range of 1.86 - 2.60 gr/cc, permeability -6 2.31 - 35.27%, magnetic susceptibilities are whitin 2,2 - 32,23 x 10 cgs emu The value of wave velocities (Vp) are around 2.2 - 5.4 km/sec, and Vs are within 1.1 - 3.1 km/sec. The result of rock samples analysed in area indicates that density distribution of less than 2.0 gr/cc and permeability distribution of > 20% may have high degree of water saturation. Keywords : Rock physical, density, porosity, magnetic susceptibility, velocity of seismic wave
GEOLOGI DAERAH PANAS BUMI ULUBELU TANGGAMUS, LAMPUNG UTARA BERDASARKAN ANALISIS METODE MAGNETOTELLURIK (MT) Panjaitan, Saultan
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Low resistivities of 0 – 15 Ώ m are interpreted as impermeable zones, functiming as cap rocks wich is hydrothermal alteration estimated to cinsist of clay. The midle resistivity 15 – 70 Ώ m is interpreted as permeable reservoir rocks located at 1250 – 2000 metres depth. The resistivity > 1000 Ώ m are metamorphic carbonate rocks. Block I in south of Mt.Rendingan and Block II at around Pagaralam hot spring formed up flow zone fluid reservoir having temperature of more than 260ºC, and contained 80 % vapour faction.Keywords: Geothermal,resistivity, impermeable, cap rock, hydrothermal alteration
USULAN BARU TITIK BOR EKSPLORASI MINYAK DAN GAS BUMI DI LAPANGAN TIAKA DAN SENORO, CEKUNGAN LUWUK-BANGGAI Hermanto, Bambang
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 1 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Tiaka dan Senoro merupakan 2 lapangan migas dari beberapa lapangan migas yang dijumpai di Cekungan Luwuk-Banggai. Serpih pra-Tersier dan serpih Tersier dari Kelompok Salodik dikenal sebagai batuan induk. Adapun sebagai batuan waduk dikenal batugamping terumbu dari Formasi Minahaki, Formasi Poh dan Anggota Mentawa yang berumur Miosen. Adapun serpih dari Formasi Kintom telah berperan sebagai batuan penutup. Berdasarkan data gaya berat baru serta merujuk struktur dari data seismik, dapat dibuat beberapa usulan penentuan titik bor eksplorasi minyak dan gas bumi yang baru. Titik-titi bor tersebut menempati daerah-daerah tinggian gaya berat.Kata kunci: Tiaka, Senoro, minyak dan gas bumi, data gaya berat.
STRUKTUR GEOLOGI BAWAH PERMUKAAN DAERAH PEKALONGAN DAN SEKITARNYA BERDASARKAN ANALISIS ANOMALI GAYA BERAT DAN MAGNET Nainggolan, D A
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 2 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The result of gravity measurement in the studied area, which is mainly covered by volcanic rocks, has an anomaly value ranging from -11 to 45 mgal. Quantitative interpretation of Bouguer anomaly and magnet shows a subsurface profile depicting the geological processes and tectonic activities. The qualitative analysis results of residual and Bouguer anomalies indicate faults mainly have east - west and north - south directions. Meanwhile, the quantitative analyses of three subsurface model profiles show the graben structure in the Subah area to the south east of Batang city.  Keywords : gravity, magnet, faults, graben, structural geology, Pekalongan area
SINYAL GEOMAGNETIK DI CEKUNGAN SENGKANG IMPLIKASI TERHADAP POLA STRUKTUR DAN KONFIGURASI BATUAN ALAS CEKUNGAN Setyanta, Budi; Subagio, Subagio
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 2 (2013): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The intensity of magnetic anomalies at Sengkang Basin varies from -750 nTto 400 nT. Basin configuration and subsurface geological structues can be analysed by modelling of the magnetic signal of ultramafic basement. Geomagnetic analisis indicates that the Sengkang Basin is underlain by high magnetic ultrabasic rocks, and the geological structures consit of a NE-SW fold, crossedcut by a NW-SE fault. Keywords: Geomagnetic signals, Sengkang basin, ultramafic basement configuration, geological structures.
STRATIGRAFI DAERAH TIMIKA DAN SEKITARNYA, PAPUA Kusnama, Kusnama
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 4 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The rocks succession exposed in the Timika area, Papua, have an age ranging from Precambrian to Quaternary. The oldest rock is the Nerewip Formation consisting of  pillow lava and basalt intercalated with foliated meta-sedimentary rocks and overlies unconformably and paraconformably by the Otomona Formation which is dominated by slate and sandstone and also metamorphosed of Precambrian-Cambrian in age. On top of the Otomona Formation is overlain unconformably the Tuaba Formation which consists mainly of sandstone, and red mudstone in the upper part. The age of this formation is not younger than Ordovician. The Siluro-Devonian Modio Formation comprises predominantly dolomite and minor clastic sediments lying disconformably on the Tuaba Formation. The overlying coarser upward sequence Aiduna Formation with a shallow marine to deltaic environment, overlies unconformably the Modio Formation consisting of alternating of sandstone and carbonaceous mudstone, intercalated by bio-calcarenite and coal beds, probably of Permian in age. On top of  this formation was conformably deposited the red beds Tipuma Formation of a terrestrial origin. The age of the formation is thought to be Triassic to Early Jurassic. The Kembelangan Group of Middle Jurassic to Late Cretaceous comprises of intercalating of quartz sandstone and mudstone which are rich in ammonite fossils overlies unconformably the Tipuma Formation. The Tertiary sequence which is dominated by carbonate platform having rich in large foraminifera of the New Guinea Limestone Group lying conformably on the Kembelangan Group. The age of this group is Paleocene to Early Miocene. The Late Miocene to Pliocene Buru Formation consist of alternating of sandstone and mudstone overlying conformably the Nugini Limestone Group. The Diorite intrusion in this unit in Late Tertiary resulted a favourable Au/Cu mineralization in the formation, in north of Timika (the Central Range of Papua). The Quaternary deposits are widespread in the southern part of south Timika area. Keywords : Papua, Timika, Stratigraphy, Diorite intrusion, Precambrium,Paleozoic, Mesozoic, and Tertiary
ANOMALI GAYA BERAT DAN TATAAN TEKTONIK SEKITAR PERAIRAN LAUT BANDA DAN PULAU SERAM Setyanta, Budi; Setiadi, Imam
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 6 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Bouguer and free air gravity anomalies  of the  Banda Sea and Seram Island are divided into southren, central and northern parts. Gravity analyses based on land measurement  combined  with ftee air anomaly data of the sea produce crust structure model which close related to rock composition and tectonic position.  Crust structure at Banda Sea is mainly composed of basaltic crust of  Banda Sea as a base and folded occurrence, collision with granitic crust border (Australian continent fragment  ?).  Banda Sea basaltic  crust is underlying volcanic sediment  Banda  Island, while granitic crust is underlying Pre-Tertiary sediment rock at Seram Island. Collision which happened since early Pliocene of two different crust has caused many things such as material from many sources in Seram Island mad melange  rock and thrust fault that appeared in the surface. Tectonic intensity has also caused some granitic crust borders to get fragmentation which reduces value of the anomaly. Further-more, it appears volcanic rock of  Banda Sea has caused gravity tectonic  toward equilibrium process basaltic  crust. This geodynamic crust   model has an implication  to geological Potency product, both in economic or disaster risk.Keywords: gravity, tectonic, evolution, geological potency
Endapan Kipas Aluvial di Daerah Bukitlawang, Sumatra Utara Berdasarkan Interpretasi Citra Landsat ETM7 dan IFSAR Faturrakhman, Muhammad Luthfi; Agustin, Fitriani
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Bukitlawang alluvial fan deposit formed, North Sumatra is one of the geomorphological aspect that can be observed in landsat and radar images.  Flow direction of the alluvial fan is  from west to east with having the total distribution of 77 Km2. Sumatra fault which is located at the eastern side of it plays a major role in the formation of alluvial fan deposit in this area. The type of alluvial fan is debris flow with the primary sedimentary process is a debris flow deposit.Keyword : Bukitlawang alluvial fan, Sumatra fault, Geomorphology, Radar – Landsat images.

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