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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 341 Documents
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Changes of Geochemical Elements in Lake Sediments from Hållvastö, Sweden: An Implication for Climate Reconstruction During Transition from the Baltic Ice Lake to the Yoldia Sea Stage Sanjaya, Indra
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 3 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Three varved sediment cores from Hållvastö have been investigated to reveal shift in climate condition linked to the local event in the Baltic Sea: i.e. the transition between the Baltic Ice Lake Stage to the Yoldia Sea Stage. That local event was marked by the color change in varve clay sequences, which point to the change in varved clay forming processes. Varve diagrams were constructed for all Hållvastö sections in order to obtain a relative age based on annual varve-thickness correlations, the relative age of the cores are corresponded to 10,640 - 10,850 varve year or 11,390 - 11,610 cal yr BP. The geochemical data for this study was acquired using the Itrax, an X-Ray Fluorescence core scanner, which provides insitu high resolution, continuous, and multi element analyses. The geochemical data from the Itrax are occupied to make the elemental profiles and correlation matrices. The geochemical data are linked with lithological and loss on ignition analyses to answer the research question. It was found that the strength of associations between the studied elements (Ti, Rb, K, Zr, Si, Ca, Sr, Mn and Fe) varied over time with changes in basin status, which are ultimately driven by changes in climate. Element profiles are demonstrated several changes which could be related with the changes in hydrological and sedimentary processes. Increasing in grain size from the Baltic Ice Lake to the Yoldia Sea varve clay sequence (as indicated by Zr/Rb) could be related to the warming event during the beginning of Holocene warming event. The ice melted faster than before and increased the amount of water as sediment transport agent, thus coarser materials input to the basin increased.Keywords - Varve Clay, Baltic Sea, Baltic Ice Lake, Yoldia Sea, Paleoclimate, Itrax XRF core scanner.
MINERALOGI MATRIKS BREKSI GUNUNG API PLISTOSEN AKHIR – KUARTER BERDASARKAN DATA XRD DI DAERAH LOMBOK TIMUR, NUSA TENGGARA BARAT Maryanto, Sigit; Hasan, R.; Siregar, Darwin A
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Late Pleistocene to Quarternary volcanic rock units of the Kalipalung, Kalibabak, and Lekopiko Formations are well cropped out at East Lombok area, composed predominantly of volcanic breccias. The volcanic breccia of the Kalipalung Formation composed of andesite, porphyry andesite, basaltic andesite, basalt, and altered igneous rocks fragments. The frequence of the occurrence of the andesites and basalts is balanced. The volcanic breccia of the Kalibabak Formation composed predominantly of andesite, porphyry andesite, and rarely basaltic andesite and basalt rock fragments. The volcanic breccia of the Lekopiko Formation composed predominantly of pumice and less of andesite rock fragments, as well as sand and conglomeratic sands. XRD analysis of selected volcanic breccias matrix shows that the plagioclase change from labradorite and andesine on the Kalipalung and Kalibabak Formation to andesine, oligoclase and albite on the Lekopiko Formation. From the old to young formations, the orthopyroxene and clinopyroxene change to orthopyroxene, and finally these minerals was dissapeared. The clay minerals of montmorilonite commomly preserved on the old formation, it dissapeared and replaced by kaolinite in the young formation. Based on the difference test between two means it appears that the Kalipalung and Kalibabak Formations are similar on their mineralogical characters. On the other hand, the Kalipalung Formatian has a real difference on the mineralogical character with the Lekopiko Formation, as well as the Kalibabak Formation with the Lekopiko Formations. Keywords: Earth Lombok, breccias matrix, mineralogy
PERAN SISTEM TUNJAMAN, SESAR MENDATAR TRANSFORM DAN PEMEKARAN TERHADAP SEBARAN CEKUNGAN SEDIMEN DI INDONESIA Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 14, No 4 (2013): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Berdasarkan umurnya, cekungan sedimen di Indonesia dapat dibedakan menjadi cekungan pra-Tersier, cekungan berumur menerus pra-Tersier – Tersier, dan cekungan Tersier. Indonesia bagian barat didominasi oleh cekungan Tersier, sementara Indonesia bagian timur didominasi oleh cekungan yang berkembang sejak Zaman pra-Tersier sampai Tersier. Baik berdasarkan umurnya maupun berdasarkan pola sebarannya, keberadaan cekungan – cekungan tersebut merepresantasikan pola perkembangan tektonik. Di wilayah bagian barat Indonesia pola sebaran cekungan berpola semi konsentris tampak mendominasi wilayah ini, dan ini dikontrol oleh evolusi sistem tunjaman. Sementara di bagian timur Indonesia hanya di wilayah Busur Banda dicirikan oleh sebaran cekungan berpola semi konsentris, dan selebihnya umumnya berpola acak, kecuali daerah yang dipengaruhi pemekaran dan tunjaman selain Busur Banda. Sebaran berpola acak ini terutama dikontrol oleh keberadaan sesar-sesar mendatar transform yang menjadi mediasi transportasi benua renik yang berasal dari Australia.Kata kunci: Tunjaman, sesar transform, pemekaran, cekungan sedimen
KARAKTERISTIK OIL SHALE DI KAWASAN BUKIT SUSAH, RIAU Hermiyanto, Muhammad Heri; Panggabean, Hermes
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2008): Jurnal Sumber Daya Geologi
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Abstract

Oil shale, as an alternative energy resource, is recognized in the Eocene - Oligocene Kelesa Formation, located in theBukit Susah area, within the Central Sumatera Basin, of the back-arc type. An almost complete rock sequence of the86.8 m thick part of oil shale-bearing formation, found in the Puti Kayu River, comprises an association of shale with carbonaceous siltstone, sandstone, conglomeratic sandstone, and conglomerate. The thickness of shale bed is approximately 27.90 meter. Oil shale in the study area is potential as an oil-gas prone source rock, within good to excellent category, containing Kerogen Types I and II.. The dominant maceral group is exinite, composed of alginite (0.4- 0.6 %), resinite (0.4 - 2.0 %), sporinite (0.4 - 0.8 %), suberinite (0.4 - 2 %), cutinite (0.6 - 1.4 %), and exsudatinite (0.2 - 0.6 %); whilst the minor one is vitrinite ranging from 0.6 - 7.6 %. The average value of vitrinite reflectance varies from 0.27 to 0.43 %. Thermal maturity level of the oil shale, in general, is situated  within  the immature category, although it tends to be close to the immature - mature boundary line, beyond oil birth line. Clay minerals consist of smectite-illite assosiation, with illite and kaolinite. The shale has undergone a diagenetic process within an early diagenetic level. A palynological study shows that the age of the oil shale in Bukit Susah is Middle to Late Eocene. Keywords: oil shale, alternative energy, Eocene-Oligocene , Bukit Susah, oil-gas prone
DEFORMASI LANDFORM PASCAGEMPA TEKTONIK JOGJAKARTA 27 MEI 2006 Santoso, Santoso
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 5 (2007): Jurnal Sumber Daya Geologi
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Abstract

The tectonic earthquake of Jogjakarta 2 7 Mei 2006 caused damages and more than 6000 people died.  The damage include houses, office buildings, public service, and other infrastructure.   On the other hand, the earthquake causes landform deformation along the Opak fault Zone and Patuk  fault  Zone, such as land crack, rock slide/fall, and liquefaction in a dug well.                                                                                                                                                                  Based on field identification of the landform deformation and damage pattern, two imaginary lines namely Opak fault Zone and Patuk fault Zone can be traced. Opak fault Strip elongates from end of the Opal River to Prambanan with general direction NW-SE,  while the Patuk fault Strip elongates from Parangtritis-Patuk to Gantiwamo/Wedi,  Klaten Regency with direction N40-450E. Keywords: landform deformation, earthquake
KARAKTER DAN TIPE MINERALISASI HIDROTERMAL DI WILAYAH BOMBANA BERDASARKAN STUDI MINERALOGI DAN GEOKIMIA Setiawan, I.; Indarto, S.; Ismiyanto, AF.; Sudarsono, Sudarsono
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 3 (2012): Jurnal Sumber Daya Geologi
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Abstract

Bombana gold mineralization occurs within metamorphic rocks hosted environment, and it's not yet reported having connection with magmatisme/volcanisme. Therefore most ore mineral deposits have to be related with volcanisme bearing metallic mineralization. The aim of this study is to explain the character and types of gold deposit using petrography, mineragraphy, fluid inclusions, AAS, and geochemistry methods.Bombana area formed by orogenic activities which is composed by metamorphic rocks mainly consists by greenschist facies and ultra mafic rocks. Petrographically rocks called as garnet glaukofane amphibol schist, peridotite, serpentinite, sandstone meta, limestone meta, andesite meta, and altered rocks. While based on major elements composition, their parent rocks has ultrabasic-acidic rocks composition, formed peridotite to andesite.Gold mineralization of Bombana area indicates an epithermal-mesothermal type, which is exhibited by hydrothermal evidences such as crosscut veins after foliation and alteration at vicinity of quartz/calcite veins. These indicate that mineralization resulted by hydrothermally process and formed after metamorphism. Ore minerals consisted of gold, pyrite, chalcopyrite, goethite, lepidocrocite and cinabar and commonly associated with quartz veins as mineralized fluids suggested as low salinity (0,18-1,78)% NaCl equivalent and water rich mineralized fluid, at (210-350)ºC temperatur ranges.Keywords: Bombana, volcanic rocks, epithermal, metamorphism
Ostrea (Turkostrea) Doidoiensis Hasibuan from The Bayah Formation West Jawa: A New Find Hasibuan, Fauzie
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 1 (2006): Jurnal Sumber Daya Geologi
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Abstract

A species of Ostreidae conspecific with Ostrea (Turkostrea) doidoiensis Hasibuan from the Middle Eocene Malawa Formation, South SuIawesi, was also discovered from Bayah Formation, Banten, West Jawa. A juvenile form of the taxon is thought to occur in the Nanggulan Formation, Central Jawa, Correlation of the  age of the formations is considered. Paleoenvironmental implication of the taxon and its distribution in  Indonesia are discussed.Keywords: Ostrea (Turkostrea) doidoensis, Bayah formation, Malawa formation, Middle Eocene, RV (right valve). LV (left valve)
PERKEMBANGAN LUAS LINGKUNGAN PENGENDAPAN SEDIMEN PLISTOSEN AKHIR HINGGA HOLOSEN DI DATARAN ALUVIAL RENGASDENGKLOK DAN SEKITARNYA, KAB. KARAWANG (JAWA BARAT) Moechtar, H.; Subiyanto, Subiyanto; Samodra, H.
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 3 (2011): Jurnal Sumber Daya Geologi
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Abstract

Study of area development on depositional environments during the Late Pleistocene to Holocene in the alluvial plain of Rengasdengklok surroundings, Karawang Regency (West Java) based on sedimentology and stratigraphy aspects. The study was based on analyses of nine borehole informations obtained along the West to East with the thickness of sediments varied from 6.75 to 10.20 m.Study on Quaternary deposits from boreholes , revealed four depositional environments. These are swamp, floodbasin, floodplain, and river channel environments. Based on correlation of the lateral and vertical variation of the sediment bodies, three Interval of Deposition Periods were recognised. Each of the interval is characterized by increasingly and decreasingly of environments which was controlled by climatic changes and tectonic. The climatic changes were recorded as (1)minimum climate into climatic optimum under warming conditions during deposition of Interval of Deposition Period A into the middle of Interval of Deposition Period B, and (2)optimum climate into climatic minimum under cooling conditions during deposition the middle of Intreval of Deposition Period B into Interval of Deposition Period C. The tectonic activities which controlled the deposition processes were recorded as two stages. These were the change posisiton of river channel deposits 1 to river channel deposits 2 and shifting of river channel deposits 2 into Recent Citarum river (river channel deposits 3).Key words: Sediment, depositional environemnt, climate, tectonic, Rengasdengklok
Dinamika Kehadiran Material Organik Pada Lapisan Serpih Formasi Kelesa di Daerah Kuburan Panjang, Cekungan Sumatera Tengah, Riau Zajuli, Heri Hermiyanto; Panggabean, Hermes; Hendarmawan, Hendarmawan; Syafri, Ildrem
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 4 (2015): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Penelitian ini difokuskan di daerah Kuburan Panjang sub-Cekungan Sumai, Cekungan Sumatera Tengah. Subjek penelitian ini adalah batuan serpih dari Formasi Kelesa yang berumur Eosen-Oligosen. Runtutan batuan dari bawah ke atas menunjukkan perulangan antara lapisan-lapisan batuan serpih, batupasir dan batulumpur yang dibatasi oleh konglomerat pada bagian atas dan bawahnya. Komposisi material organik terdiri dari maseral vitrinit berkisar antara 0,20 – 5,0 %, eksinit  0,60 – 4,70%, pirit 0,20 – 16,00%, karbonat 0,20 -24,2 % dan mineral lempung merupakan komponen yang paling dominan yaitu berkisar antara 71,60 -98,00%. Berdasarkan hasil analisis TOC, kekayaan material organik serpih Formasi Kelesa mempunyai nilai TOC dari 1,18% sampai 7,17% yang menunjukkan kemampuan serpih sebagai batuan induk termasuk kategori sangat baik. Kehadiran material organik di daerah penelitian menunjukkan adanya suatu siklus pengayaan material organik dari bawah ke atas.
ANALISIS LINGKUNGAN PENGENDAPAN BATUAN BERUMUR JURA DI KEPULAUAN MISOOL, PAPUA BERDASARKAN FOSIL MAKRO Hasibuan, Fauzi
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 5 (2010): Jurnal Sumber Daya Geologi
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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

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