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Jurnal Geologi dan Sumberdaya Mineral
ISSN : 08539634     EISSN : 25494759     DOI : -
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.
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Articles 341 Documents
Distribusi Foraminifera Bentonik Hidup dalam Hubungannya dengan Sedimen Dasar Laut di Selat Sumba, Nusa Tenggara Timur Putra, Purna Sulastya; Hari Nugroho, Septriono
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 1 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (363.92 KB) | DOI: 10.33332/jgsm.geologi.20.1.17-26

Abstract

Marine geological survey of Ekspedisi Widya Nusantara (EWIN) LIPI 2016 was conducted by using RV Baruna Jaya VIII in the Sumba Waters from 4 to 26 August 2016. One of the aim of this survey is to understand the sea floor surface sediment characteristics and its influence to the benthic foraminifera distribution. Seven sediment samples were collected from sea floor surface in Sumba Strait, at the different location and depth using grabbing method with box corer. The samples have analyzed for the foraminifera content, sediment grain size, organic matter and carbonate content, and chemical element by XRF method. The living benthic foraminifera distribution increase to the east of the research area, which have higher content of the organic material and Fe, Rb, Zr, Zn and Sr elements in the sediment. The benthic foraminifera distribution most abundance founded at the depth of 800-1000 m with sediment types are sandy coarse silt  to sandy very coarse silt.Keywords: Benthic foraminifera, distribution, sea floor sediment, Sumba Strait. DOI: 10.33332/jgsm.2019.v20.1.17-26
Geokimia Endapan Nikel Laterit di Tambang Utara, Kecamatan Pomalaa, Kabupaten Kolaka, Provinsi Sulawesi Tengara Indra Kusuma, Riko Ardiansyah; Kamaruddin, Hashari; Rosana, Mega Fatimah; Tintin Yuningsih, Euis
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (232.392 KB) | DOI: 10.33332/jgsm.geologi.20.2.85-92

Abstract

Pomalaa is administratively located in Kolaka Regency, Southeast Sulawesi Province. The nickel mining business area in Pomalaa is managed by State-Owned Enterprises and Private Enterprises. Pomalaa is a sub-district that has natural resources in the form of nickel. Nickel Laterite deposits is a result weathering of ultramafic rock that is leaching process and accumulates in the supergen enrichment zone. The lateritization factor is controlled by lithology, morphology, and structure. In general, the profile of laterite nickel deposits in the North Mine area from top to bottom consists of top soil, limonite, saprolite, and bedrock zones. The laterite nickel precipitate in the North Mine shows varying thickness, based on color, texture, size and mineral composition. Laterite deposits from drilling results reaches an range of 25 - 30 meters. Soil and rocks sampling from each laterite zone every meter resulting from drilling are carried out by laboratory testing using XRF (X-Ray Fluorescence) analysis method with 283 total sample. High Ni element show enrichment in the saprolite zone, whereas in the high Fe (iron) element in the limonite zone.Keywords: nickel, laterite, geochemical, Pomalaa
Model Fasies Batuan Karbonat Formasi Wainukendi di Cekungan Biak-Yapen, Papua Permana, Asep Kurnia; Shima, Joshua; Maryanto, Sigit; Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (923.166 KB) | DOI: 10.33332/jgsm.geologi.20.2.101-110

Abstract

This paper provides the carbonate rocks facies model of the Wainukendi Formation. Several outcrops are well exposed in the Southern part of the Supiori Island. The main data are taken from 28 outcrops and 25 measured sections. Thirty seven rocks samples from the Korido dan Warvey Sections were collected and have been petrographic examination for microfacies analysis. Finally, the analysis find that the Wainukendi Formation basically composed by bioclastic carbonate platform and reef margin platform. Microfacies analysis indicate that these carbonate platforms consist of 4 facies zone, deep shelf (FZ2), toe of slope (FZ3), slope (FZ4), and platform margin (FZ5). Keywords: Facies, stratigraphy, Wainukendi Formation, Biak-Yapen Basin.
Geokimia Batugamping Formasi Gumai dan Formasi Baturaja di Wilayah Muaradua, Ogan Komring Ulu Selatan, Provinsi Sumatera Selatan Irzon, Ronaldo; Maryanto, Sigit
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 3 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Formasi Gumai dan Formasi Baturaja merupakan dua dari beberapa satuan batuan yang terdiri dari batugamping di daerah Muaradua, Ogan Komring Ulu, Provinsi Sumatera Selatan. Komposisi geokimia merupakan sisi yang dibahas dalam penelitian ini pada kelompok batugamping dari Formasi Gumai dan Formasi Baturaja. Kadar oksida utama pada contoh diketahui menggunakan perangkat XRF, sedangkan unsur jarang dan unsur tanah jarang dengan ICP-MS. Bivariate plots, koefisien determinasi, dan pearson correlation coefficient dimanfaatkan untuk membedakan batugamping dari kedua unit batuan ini. Rataan unsur tanah jarang pada batugamping Formasi Baturaja (89,79 ppm) jauh lebih tinggi dari contoh yang sama dari Formasi Gumai (33,63 ppm). Melalui studi ini dapat disimpulkan bahwa kedua kelompok batugamping memiliki proses pembentukan berbeda. Formasi Baturaja lebih banyak dipengaruhi oleh bahan klastik dengan mengacu pada komposisi Al2O3, Fe2O3T, dan Er/Nd. Kondisi lingkungan lebih oksidatif pada batugamping Formasi Baturaja dikonfirmasi oleh anomali Ce. Pengaruh material terrigenous pada Formasi Baturaja dan Formasi Gumai dapat disimpulkan melalui perbandingan Y/Ho.
Karakteristik Formasi Seblat di Daerah Bengkulu Selatan Heryanto, Rahmat
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 3 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Seblat Formation is an oldest Tertiary sedimentary rock in Bengkulu Basin, which was made up of a clastic sedimentary rocks and were deposited in regretion condition. The lower part was deposited in an open sea shelf – fore slope and the upper part in a fore reef - lagoon shelf environment. The sandstones of formation consist of arkose, litharkose, felspathic litarenite, and litarenite. The framework of grains comprises quartz, feldspar, and rock fragments. Matrix/cement consists of clay and calcareous clay. Accesories mineral are muscovite, epidote, and glouconite. Clasts which formed the sandstone were probably derived from a magmatic arc and recycled orogen of the Pre-Tertary Gumai- Garba Zone. Diagenetic processes recognized are compaction and the formation of authigenic minerals and secondary porosities. Their diagenetic stage were included in the mesogenetic mature A, which equivalent to mudrock stage II, with the paleo temperature80º to 95ºC, and the burial thickness of 2 to 3 km. The mudstone within the Seblat Formation indicates an oil source rock, whereas the sandstone and limestoneare good for a reservoir rock. Keywords : Seblat Formation, diagenesis, compaction, authigenic mineral, mesogenetic
IDENTIFIKASI GUNUNG API PURBA PENDUL DI PERBUKITAN JIWO, KECAMATAN BAYAT, KABUPATEN KLATEN – JAWA TENGAH Bronto, Sutikno
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 1 (2010): Jurnal Sumber Daya Geologi
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Abstract

According to previous workers, Mount Pendul were considered as micro gabbro intrusive rocks. However, in the present quarry area pillow basaltic lava flows are exposed in the eastern slope of the hill. The lava was erupted through a paleoconduit below deep sea water, having massive to autoclastic breccias, obsidian in the glassy rims and gradually changes to apanetic texture in the inner part. Microscopically, the obsidian is devitrified to become spherulites, while to the inner part the basaltic rock gradually changes from vitrophyric to hypocrystallin porphyritic textures. On the basis of the volcanic geology idea, the association of those basic intrusive and extrusive rocks is believed to be a remnant of Pendul Paleovolcano that has been eroded through the time. The age of volcanisms, particularly in Bayat area and regionally in the Southern Mountains, can be divided into four periods, e.g. Paleocene, Late Eocene - Early Oligocene, Early Miocene and Middle Miocene. However, based on the range of radiometric ages and predominant volcanic rocks in the Southern Mountains, it is suggested that volcanisms had been continued from Late Eocene to Early Miocene. The oldest (Paleocene) and the youngest (Middle Miocene) radiometric ages should be verified in order to develop researchs on volcanism and tectonics in the Southern Mountains, Java.Keywords: bayat, java, jiwo, paleovolcano, pendul, southern mountains
Pola Anomali Geomagnet Daerah Pulau Taliabu dan Pulau Mangole, Maluku Utara Nainggolan, Daulat Adrian
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 2 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Daerah penelitian merupakan suatu cekungan frontier yang diharapkan bisa menghasilkan hidrokarbon. Secara umum besaran nilai anomali magnet total di daerah ini menunjukkan nilai yang sangat rendah yaitu berkisar dari -200 sampai -467nT. Anomali magnet ini sangat berbeda dengan anomali gayaberat yang mempunyai besaran yang sangat tinggi ( 189- 320 mGal) dan merupakan daerah yang mempunyai nilai anomali paling tinggi di Indonesia. Dari hasil interpretasi kualitatif anomali geomagnet total Cekungan Taliabu terletak di sebelah barat Jorjoga menerus ke arah tenggara sampai pertengahan P. Taliabu. Dari sini membelok ke arah timur melalui Pelita di ujung barat P . Mangole sampai Fegudu di timur P. Mangole.Kata kunci - hidrokarbon, anomali magnet total, cekungan P. Taliabu dan P. Mangole.
INDIKASI FENOMENA STRUKTUR GEOLOGI BAWAH PERMUKAAN DAERAH RENCANA TAPAK PEMBANGKIT LISTRIK TENAGA NUKLIR GUNUNG API GENUK DAN SEKITARNYA, JEPARA, JAWA TENGAH Panjaitan, Saultan; Subagio, Subagio
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
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Abstract

Generally, gravity anomaly pattern in research area is devided into two groups, high anomaly with the value ranges from 37 mgal to 43 mgal, and low anomaly, varies from 10 mgal to 37 mgal. The high anomaly group might be caused by the existing volcanic Quartenary rocks, and the low anomaly group indicates a sedimentary basin. Based on the result of 3 quantitative analysis, the high anomaly group reflects the existing volcanic Quartenary rocks with density 2.8 gr/cm relatively higher than surrounding. Analysis also shows in the site plan of Ujung Lemahabang the predicted faults are not encountered. The area in radius 5 km from research area, predicted the capable fault not exist in radius 25 km, found two faults ofshore and three faults in western part of investigation area. Keywords : Lemahabang, gravity anomaly, sedimentary basin arc fault
BATUAN SEDIMEN HALUS KELOMPOK MANDAI BERDASARKAN ANALISIS SCANNING ELECTRON MICROSCOPE (SEM) Zajuli, M.H. Hermiyanto
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 3 (2013): Jurnal Sumber Daya Geologi
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Abstract

The eastern part of the Ketungau basin that is generally known us the Mandai sub-basin is a sedimentary basin that had been formed since early Tertiary. Fine-grained sedimentary rocks taken from the Mandai Group comprising four samples of mudstone and three samples of siltstone. Based on Scanning Electron Microscope analysis seven samples fine sediment of the Mandai group consist of illite (K1-1.5Al4(Si7-6.5Al1-1.5O20)(OH)4, smectite (1/2Ca)0.7(Al,Mg,Fe)4(Si,Al)8O20)nH2O and kaolinite (Al4(Si4O10)(OH)8. Other minerals are silica or fine-grained quarzt, feldspar, and algae (botryococcus). Diagenesis processes show that fine sediment of the Mandai group have undergone a diagenetic process within an mesodiagenetic level. Fine sediments have been buried at more than 2500 - 4000 m depth by temperature varying from 80° to 120°C.Key words : Ketungau Basin, SEM, diagenesis, siltstone, mudstone
DINAMIKA GARIS PANTAI KABUPATEN INDRAMAYU, JAWA BARAT, BERDASARKAN PENAFSIRAN CITRA SATELIT Kusnida, Dida; Astjario, P.
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2008): Jurnal Sumber Daya Geologi
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Abstract

Marine and coastal dynamic maps of Indramayu extracted from satellite imageries indicate the quantification of changes; those are changes of coastline, extension and the potential areas of erosion and sedimentation. The biogeochemical and hydro-oceanographic interactive processes of the up and downstream areas produce the marine and coastal physiographic of Indramayu. Therefore, the problem solving of coastal abrasion and accretion in Indramayu have to be executed through inter-sector coordination. Keywords: abrasion, accretion, coastal, coastline, satellite imageries

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