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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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ANALISIS BAHAYA GEMPA BUMI LENGAN UTARA SULAWESI Santoso, Santoso; Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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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
SEDIMEN PASANG-SURUT DI KALI KERUH, DESA LOR AGUNG,KABUPATEN PEKALONGAN Martosuwito, Surono; Fakhruddin, Rachmat
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 1 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Singkapan sedimen yang diukur di Kali Keruh mempunyai ketebalan 194 m. Batuannya penyusunnya terdiri atas batulumpur, batulempung, napal dan batulanau; dengan sisipian batupasir. Singkapan itu merupakan endapan pasang-surut, yang lingkungannya berubah-ubah dari zona pasir sampai zona lumpur. Perubahan lingkungan itu mungkin disebabkan oleh tektonik lokal. Batuan penyusun singkapan itu dan lingkungan pengendapannya sama dengan Formasi Merawu, namun mempunyai perbedaan umur. Analisa Foraminifera contoh batuan dari singkapan itu menghasilkan umur N17 – N19 atau akhir Miosen Akhir – akhir Pliosen Awal, sedangkan Formasi Merawu berumur N4 – N13 atau Miosen Awal – Miosen Tengah.Kata kunci: pasang-surut, zona lumpur, Formasi Merawu dan Kali Keruh.
GEOLOGI DAN PALEONTOLOGI FORMASI BALANGBARU DAN FORMASI MARADA BERUMUR KAPUR, SULAWESI SELATAN Hasibuan, Fauzie; Limbong, Alex
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 6 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

A geological and paleontological studies on the Balangbaru and Marada Formations has been carried out. Both formations show that their depositional environment was in basin with turbidity currents. Marada Formation can be correlated with Panggalungan Member of the distal part of the Balangbaru Formation. Paleontological study on the Balangbaru Formation has yielded some macrofossils such as echinoid, bivalve Inoceramus sp., ammonite Grossouvreites sp. Marada Formation contains trace fossil Spirorhaphe sp. and species of nannoplankton have been extracted from the shale e.g. Ceratolithoides aculeus, C. kamptneri, Lucianorhabdus cayeuxii, L. arcuatus, L. maleformis, Micula murus, M. concava Lithraphidites quadratus, and Prediscosphaera sp. Based on the presence of macrofossils, nannoplankton, and radiolarian fossils of previous workers it can be concluded that the deposition of the Balangbaru and Marada Formations was in Albian to Maastrichtian (Late Early Cretaceous to Late Cretaceous) time. Keywords: echinoid, bivalvia, ammonite, trace fossil, nannoplankton, radiolarian turbidite
KETERDAPATAN INTAN SEKUNDER DI SEPANJANG SUNGAI LANDAK, KALIMANTAN BARAT Aziz, Said
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 5 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Alluvial diamonds are found in several places in Kalimantan,   out up to now the source (rock) of alluvial diamond in Kalimantan is not known yet. Since 19th centuries, some companies had explored alluvial diamond in these areas but none of them have succeded  to find the source rock of alluvial diamond.The study of alluvial diamond distribution in West Kalimantan, especially along Landak River, indicates that the alluvial diamond in this area is limited only in Protolandak drainages, including Landak and Sekayam River regions.The result of heavy mineral analysis from this study could be used to estimate the distribution of alluvial diamond and heavy minerals content in this area.  Besides this, it is also used to trace where the source rock of alluvial diamond comes from. Keywords.: alluvial  diamond, heavy mineral, West Kalimantan
COOLING OF GRANITIC ROCKS IN THE PALU REGION, MIDDLE SULAWESI: ZIRCON AND APATITE FISSION TRACK CONSTRAINTS Permanadewi, Sam; Baharuddin, Baharuddin
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 3 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Zircon and apatite fission track analysis has been employed to constrain a cooling episode of the Oligocene-Miocene granitic sequences in the Palu region, Middle Sulawesi. A fission track dating from five outcrops resulted in zircon ages ranging between 9.5±0.5 Ma and 29.5±2.1 Ma. These ages may represent the onset of crystallisation during magmatic emplacement. This interpretation is consistent with the corresponding K/Ar ages ranging between 8.6 Ma for biotite and 31 Ma for feldspar. All but one sample show apatite fission track ages younger than zircon ages. The apatite fission track ages range between 6.2±1.3 Ma and 29.3±2.5 Ma. Importantly, the oldest zircon and apatite crystals separated from the rock sample derived from pluton in the southern section suggest that the host sequence has not undergone a further cooling event since crystallisation in the Oligocene. However, the remaining apatite fission track ages from rock successions in the northern sector of the studied region reveal an episode of post-crystallisation rapid cooling of the Oligocene granitic pluton, possibly due to local-scale uplift in response to overthrust in the late Miocene.Keywords: cooling, fission track, granitic pluton, Sulawesi
SATUAN MORFOLOGI DASAR LAUT PERAIRAN SELATAN PULAU LAUT, KALIMANTAN SELATAN, SEBAGAI PRODUK AKTIVITAS STRUKTUR GEOLOGI BAWAH PERMUKAAN Aryanto, NCD; Surachman, M
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 3 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The studied  area is located in south Kalimantan waters. Regionaly and physiographically it is an interesting location because this location is the transition area between the west and east Indonesian regions in which their geologic setting are very different.The transition area is reflected by the difference in the sea floor morphology. The bathymetry contour pattern at the western area that is part of the Sunda Shelf is reflected by a straight contour and distanlyspaced among them. Its slope is not more than 1” which is then calledas a Plain morphology unit. While the eastern area has a locally close pattern and its slope Is quitegentle. This feature is called as a Reef hilly morphology unit. Keywords: sea floor morphology unit, subsurface structure, Kalimantan
Mineralogi dan Geokimia Tuf Berumur Tersier dan Kuarter di Daerah Cibadak, Sukabumi, Jawa Barat Permanadewi, Sam; Maryanto, Sigit; Subandrio, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 4 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Fine-grained pyroclastic rocks  found in the Cibadak area, Sukabumi divided into two groups, namely Tertiary tuff composing of Jampang Formation and Quarternary tuff as the result of  young volcanic eruptions. The relationship between mineralogy and geochemistry of those tuffs are discussed in this paper. Laboratory testing was conducted on fifty rock samples taken from the field. A kind of mineralogy composing the rock can be identified by the XRD (X-Ray Diffraction) mineralogy test, while the major oxide of the rock can be calculated with the XRF (X-Ray Fluorescence) geochemistry test. The XRD mineralogy test shows  two secondary mineral that becomes the differentiation between the two tuffs are zeolites and clay minerals. The zeolites present at most of the Tertiary tuffs as a result of the rock alteration which involves an increasing in formation temperature and pressure. Clay minerals are mostly present at the Quarternary tuffs as a result of rock wheathering on the surface. The zeolite and clay minerals are associated with almost all chemical oxides of the rocks. The chemical oxides including SiO2, Al2O3, Fe2O3, MgO, K2O, TiO, and MnO. The XRF rock-chemically characters show there are no differences of the chemical oxide components on both of these pyroclastic rock groups. Keywords: mineralogy, geochemistry, tuff, Tertiary, Quarternary.
POLA DAN GENESA STRUKTUR GEOLOGI PEGUNUNGAN SELATAN, PROVINSI DAERAH ISTIMEWA YOGYAKARTA DAN PROVINSI JAWA TENGAH Prasetyadi, C.; Sudarno, Ign; Indranadi, VB.; Surono, Surono
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 2 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The geological structures in the study area are dominated by faults. The rest directions of the faults are northeast-southwest (16 faults) and north-south (14 faults). The remainder of faults are trending in northwest-southeast (3 faults) and west-east (3 faults) directions. Generally, the northeast-southwest and north-south trending faults are dominated by sinitral faults and a few of them are reactivated as normal faults. Whereas the northwest-southeast and west-east trending faults are mainly dextral and or normal faults.Key words: fault, sinitral, normal, and lineament
Kelurusan Daerah Salopa dan Sekitarnya, Jawa-Barat Hasil Penafsiran Citra DEM dan Kaitannya dengan Mineralisasi Emas Sidarto, Sidarto
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 1 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Daerah Salopa dan sekitarnya termasuk Jalur Pegunungan Selatan yang kaya endapan bijih, yang pembentukannya berkaitan dengan sesar. Pada data inderaan jauh, sesar diperlihatkan sebagai kelurusan lembah. Kelurusan hasil interpretasi citra DEM (Digital Elevation Model) dapat dikelompokkan menjadi 9 kelompok, yaitu kelompok A (75-280), kelompok B (55-70), kelompok C (40-45), kelompok E (10-25), kelompok F (350-5), kelompok G (325-335), kelompok H (310-320) dan kelompok H (285-300). Berdasarkan panjang kelurusan, kelompok kelurusan ini dapat mengetahui sesar regional, yang meliputi, Sesar berarah timur timurlaut - barat baratdaya (sesar mendatar mengiri), sesar timurlaut – baratdaya (sesar mendatar mengiri), sesar baratlaut – tenggara (sesar mendatar menganan), sesar timur – barat (sesar normal), sesar utara – selatan (sesar normal atau sesar mendatar), dan sesar utara timurlaut – selatan baratdaya (sesar mendatar menganan). Keberadaan 4 tambang emas berkaitan dengan keberadaan Sesar berarah timur timurlaut - barat baratdaya (Sesar Cijawer, dan Sesar Cigondang), dan perpotongan sistim sesar baratlaut – tenggara (Sesar Limusnunggal) dan sistim sesar timur timurlaut – barat barat laut (Sesar Cisasungka). Berdasarkan keberadaan sistim sesar, kelurusan dan singkapan batuan terubah, di daerah sekitar Salopa menunjukkan keterdapatan mineralisasi emas. Kata kunci : Citra DEM, kelurusan, sesar, mineralisasi emas, Salopa dan daerah sekitarnya.
PENGARUH KEGIATAN TEKTONIK DAN GUNUNG API TERHADAP KARAKTERISTIK SEDIMENTOLOGI SEDIMEN NEOGEN AWAL DAERAH BAGIAN TENGAH CEKUNGAN SERAYU Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Early Neogene sediments in the central part of the Serayu Basin have different sedimentological characteristics of one unit from the others. They comprise the mean value of four variables, i.e. (1) sand/shale ratio, (2) bed frequency, (3) smectite / kaolinite ratio or Sm/(Sm+Ko), and (4) quartz/feldspar ratio or K/(K+F). The difference of the mean value of those four variables represents implication of different intensities of tectonic and volcanism activities. The variable values suggest that there was increasing tectonic activity followed by increasing volcanic activity from older rock unit to younger unit.Keywords: sedimentological characteristics, tectonic activity, volcanic activity, Serayu Basin

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