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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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Karakteristik Petrologi dan Geokimia Batuan Gunungapi Berumur Oligosen Akhir - Miosen Di Daerah Gunung Muro, Kalimantan Tengah Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 2 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Mount Muro is located in Purukcahu District of Central Kalimantan and geologically dominated by Late Oligocene-Miocene volcanic rocks. The purpose of this research mainly to understand the geodynamic evolution, including rock type, magmatic suites and tectonic environment during Late Oligocen to Miocene of the research area. Eight samples from that region were collected and prepared for petrographic and geochemistry analyses. Petrography analysis using polarization microscope was   carried out for rock classification, whereas XRF and ICP were used mainly to detect the presence of major, trace and rare earth elements. Based on petrographic analyses the eight rock samples studied can be classified into basalt, andesite-basalt and diorite. Cross plot of weight percent SiO2  versus weight percent (Na2O + K2O) revealed that the rocks are differentiated into basalt, andesite-basalt, basalt trachy-andesite to andesite. The weight percent SiO2 versus weight cross plot percent K2O demonstrated that rocks samples of the studied area included in calc-alkaline magmatic series. This implies that the rock samples were originally from a convergent plate margin tectonic environment. The existence of Nb through in the spider diagram has been explained in terms of retention of this element in the source during partial melting. Keywords: petrology, geochemistry, tectonic, geodynamics, magmatic series
PERBANDINGAN CALORIFIC VALUE BERAGAM BAHAN BAKAR MINYAK YANG DIPASARKAN DI INDONESIA MENGGUNAKAN BOMB CALORIMETER Irzon, Ronaldo
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 4 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Calorific value is amount of released energy when a known volume of gas is completely combusted. Now, the market of fuels in Indonesia is not only owned by Pertamina, but there have been many gas stations conducted by foreign companies since 2005. One of the most famous ways to rank the fuels' performance is based on research octane number (RON). A different kind of fuels' calorific value with various octane number sold in many gas stations would be important information for fuel customers. The use of the bomb calorimeter to analyze the calorific value has been published in diverse applications. Although bomb calorimeter is viable to measure the heat content of the liquid, we can not easily find a writing of using the equipment on this kind of sample. The method used here has been successful to measure the calorific values of three liquid samples using bomb calorimeter. This study quantifies calorific value of eight gasoline and five diesel samples of 83 measurements. Statistics measurements of at least six times repetition indicate: the method have very good stability (%RSD = 0.09 – 0.63%), there are differences in colorific value on samples with same octane number produced by different company, increase in octane number also raises the samples' calorific value, and the ratio of fuel's price to their heat content is still lame.Keywords : bomb calorimeter, calorific value, fuel, octane number
Kaitan Potensi Sumber Daya Geologi, dan Gempa Bumi di Daerah Sinabang, Sumatera Nainggolan, D.A
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 2 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Analysis of Bouguer anomaly data in Sinabang Quadrangle produced a subsurface geological structure model including the configuration of basements of continental and oceanic crusts. Intrepretation of the anomaly patterns, the subsurface profile models including the geological structures depict the geological proseses, tectonics and its relationships with natural resources and tectonic earthquake. The qualitative analyses results of residual and Bouguer anomalies indicate that the structures in the researched area generally have northwest - southeast and southwest - northeast directions. Meanwhile the quantitative analysis shows the presence of two kinds of sedimentary rock with the density of 2.20 gr/cm-3  and 2.35 gr/cm-3  . Keywords : gravity, geological structure, earthquake, Sinabang
DEPOSITIONAL ENVIRONMENT OF THE SAROLANGUN COALS, SOUTH SUMATRA BASIN Permana, Asep Kurnia; Panggabean, Hermes
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 4 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Muaraenim Formation, a Late Miocene unit within the South Sumatera Basin, is included in some of the most significant coal resources in Indonesia. The upper part of the unit exposed in the Sarolangun Region, where it consists mainly of sandstone and shale, with relatively thin (< 1.5 m) coal beds. Lithofacies analysis of the outcropping strata indicates that deposition took place in a terrestrial to marine environment. Microscopic analysis shows that the coal consists mainly of vitrinite maceral group (telovitrinite and detrovitrinite), with having a rare to sparse inertinite and minor liptinite and mineral matter. Palynological studies show abundant pollens, derived from mangrove vegetation that grew in a fresh water environment. The GI and TPI values, calculated from detailed maceral analysis, when plotted on similar diagrams to those developed by Diessel (1992) show the coals to have two different facies characteristics. Some of the coals, especially those having a high vitrinite content, show high TPI and relatively high GI values, suggesting that deposition was in upper delta plain and fluvial environments (wet forest swamp) with a relatively high rate of subsidence. Other coals have much lower TPI but higher GI values, indicating that peat was possibly developed in in a lower delta plain, with relatively slow subsidence conditions. Some coal samples also have high proportions of pyrite and other mineral matter, and thus it might have been deposited in more brackish environments. The change reflects the onset of marine transgression near the top of the Muara Enim sequence. Palynological analysis indicates the occurrence of fresh water and mangrove vegetation, supporting deposition in wet and possibly partly brackish conditions.Keywords: Depositional environment, Sarolangun coals, South Sumatera Basin, Indonesia
FLUID INCLUSION CHARACTERISTICS OF AURIFEROUS ARINEM AND BANTARHUNI QUARTZ VEINS, ARINEM, WEST JAVA, INDONESIA Yuningsih, Euis Tintin
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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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.
OPTIMASI TEKNIK FIRE ASSAY DAN KONDISI KUPELASI UNTUK MEMPEROLEH KOMPOSISI FLUKS TERBAIK PADA ANALISIS KADAR EMAS Irzon, Ronaldo; Kurnia, Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 1 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Pencarian terhadap emas tidak ada habisnya, bahkan sejak 4000 SM bahan ini sudah digolongkan sebagai logam mulia. Karena keberadaan emas di alam berada dalam keadaan heterogen dengan konsentrasi rendah, maka dibutuhkan teknik prakonsentrasi agar analisis kandungannya menjadi lebih tepat. Fire assay merupakan pilihan prakonsentrasi yang telah dikenal pada era Mesir maupun Romawi kuno. Teknik ini memang membutuhkan energi besar dan bahan campuran yang banyak walau ketepatan nilai analisisnya terbukti sangat baik. Optimasi metoda lead fire assay yang dipadukan dengan perangkat AAS pada pemeriksaan kadar emas terhadap contoh jenis pasir hitam telah dilakukan. Penelitian ini mendapatkan komposisi fluks terbaik menilik kepada jenis contoh tersebut untuk menghasilkan lead button tertinggi. Hasilnya menunjukkan bahwa reaksi fusi campuran fluks tercapai pada temperatur 1000 °C dengan pemanasan selama 60 menit. Optimasi energi dalam penjagaan kondisi furnace pada tahap kupelasi juga telah didapat dengan tingkat recovery mencapai 89,5%.Kata kunci: emas, pasir hitam, fire assay, fluks, kupelasi
PERUBAHAN LINGKUNGAN DAN KARAKTER SISTEM PENGENDAPAN PLISTOSEN AKHIR HOLOSEN DI DATARAN PANTAI PEKALONGAN, JAWA TENGAH Moechtar, Herman; mulyana, Herman; Hidayat, Suyatman
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 6 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The study of the environmental changes and character of the depositonal systems during Late Plistocene to Holocene on the Pekalongan coastalplain was based on analyses of the sedimentology and stratigraphy of fourteen boreholes. The penentration of the bore head varied from 7.70 to 15.80 m. Six depositional environments which occurred above the Damar Formation (QTd) are: linier clastic deposits (offshore, nearshore, and beach), fluvial deposits (river channel and floodplain), and swamp deposits. These deposits are separated by three depositional intervals (IP I-III). Based on the correlation of lateral and vertical stratigraphic successions, the environmental changes and character of the depostional systems are controled by sea level changes during the Late Pleistocene which were related by glacial and inter-glacial periods. Probably, after deposition of IP I, a local tectonichsve controled deplifting of the are. Keywords: Sedimentology, Stratigraphy, late Pleistocene - Holocene
REKAMAN PERISTIWA GEOLOGI KUARTER PADA SEDIMENTASI DAN FLUKTUASI PERMUKAAN AIR DANAU TONDANO PURBA DIDASARI KORELASI UNIT FASIES KUARTER DI TENGGARA DANAU, SULAWESI UTARA Moechtar, Herman
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 5 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Quaternary deposits of lake Tondano consist of Tondano tuff covered by young Volcanic rock and the Quaternary sediments. The Quaternary sediments are divided by lake, sand-lake, tidal-lake, river channel, floodplain, swamp, and flood basin deposits. In general, the sedimentary and fluctuation of lake level processes occurred in active tectonic and tectonism is the main factor controlling their occurrence. The amount of material from eruption, source area and slope gradients were important factors influencing the development of the sedimentary succession in the paleo-lake Tondano.The vertically and laterally different accumulation of sediments during the deposition into the basin, is obviously related to the regional tectonic and local volcano tectonic of the basin. Probably, changes in climatological between more humid to drier conditions occurred from unit of deposition facies II (Ufp.II) to unit of depositon facies III (Uft.III). Keywords:   Facies, sedimentation,  lake water level fluctuation,  tectonic
FASE KOMPRESI DI SELAT MAKASSAR BERDASARKAN DATA GEOLOGI DARATAN, SEISMIK LAUT DAN CITRA SATELIT Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 3 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Seismic data indicates that the last deformation period in the Makassar Strait has been undergonein compressional phase, different from the previous period as reported by many authors that Makassar Strait was formed in extensional phase. Terrestrial geology data obtained from West Sulawesi indicate that the vergence of thrust-fold belt is directed to the west, and is still active up to now. Meanwhile, the thrust and fold structures found in East Kalimantan have a vergence directed to the east. Seismic data from the eastern part of the Makassar strait shows that the youngest sediments is thrusted and folded with a vergence to the west. On the other hand, the youngest sediments from the western part of the strait is thrusted, folded and verging to the east. Meanwhile, the satellite imagery of the Makassar Strait shows that the west margin of West Sulawesi is similar to the margin of Paternoster Platform, suggesting an opening tectonics. However, interpretation of the youngest structures on the imagerry indicate that after opening episode subsequently was followed by compressional phase.Key words: compressional phase, extensional phase, Makassar Strait, thrust-fold belt, vergence. 
MORFOSTRATIGRAFI TUF IGNIMBRIT MANINJAU DI NGARAI SIANOK, DUSUN BELAKANG BALOK-BUKITTINGGI, SUMATERA BARAT Poedjoprajitno, Soemantri
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 3 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The ignimbtrite plato of Sianok Valley at Belakang balok Village was produced by two periods of Maninjau volcanic eruptions. The two eruption periods are separated by fluvio volcanic deposits, consisting of very qoarse sand and conglomerate. The two periods pyroclatic deposits at containing pumice and locally several coal.  These pyroclatic deposits were faulted and formed terrace morphology. The Sianok Valley is considered as an effect of the reactivation of basement fault throughting the ignimbrite deposits. Keywords:morphostratigraphy , Maninjau pumice tuf, terrace, fault, plato

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