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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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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
Publisher : Pusat Survei 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
Publisher : Pusat Survei 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
Publisher : Pusat Survei 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
Publisher : Pusat Survei 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
Basement Configuration and Delineation of Banyumas Sub-Basin Based On Gravity Data Analysis Setiadi, Imam
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 2 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Many oil and gas seepages occurred on thesurface of Banyumas Basin as one of the active petroleum systems manifestation. Geological complexity of this basin makes it difficult to discover the oil and gas reserves unlike the basin of the East and West Java area. The aims of this research are to determine the subsurface geological structure patterns, distribution of sedimentary sub-basin, and  basement configuration. Gravity data of Banyumas and surrounded area is analysed by using spectral analysis, moving average filter, and 2D forward modelling. The gravity data delineation analysis resulting about six sedimentary sub basins with depocentre of 5.5 km positioned at Purbalingga and Karangkobar Sub-basin. The structural pattern derived from residual gravity anomaly shows a relative southeast-northwest strike-slip fault and an east-west trend basement high pattern. Concerning from the oil and gas seepage presence in the study area, sufficient sedimentary rock thickness, and supporting petroleum system, this region is considered as an attractive subbasin for further petroleum prospect investigation. Keywords : gravity analysis, sedimentary basin, spectral analysis, moving average, 2D modelling
NEO-SEISMOTEKTONIK SEMENANJUNG MANADO SULAWESI UTARA Poedjopradjitno, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 4 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Neo-Seismotectonic study of Manado Peninsula by using approach of geomorphology, geology data method and seismisity, obtained of picture in detail peninsula structure pattern and can interpret earthquake susceptable disaster zona. Such structure pattern is area grouped of peninsula structure become six domain structure, that is : Amurang domain structure (A), Soputan (S), Tondano (T), Manado (M), Likupang (L) and Batuangus ( BA).Based on susceptable the earthquake disaster matrix covering geomorfologi data, geology, ground and rock physical, tectonic indication, infrastructure, disaster potency and risk, peninsula area can divided to the three area susceptable to earthquake disaster namely high, middle and lower earthquake disaster susceptable zona.Key word :geomorphology, geology, seismicity and structure
The Stratigraphy and Lithology of the Kuma River area Buru Island, Maluku H.Harahap, Bhakti; Poedjoprajitno, Soemantri
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 2 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The stratigraphy of Kuma River area is divided into six formations, bottom to top, Dalan, Duna, Kuma, Waeken, Wakatin, and Leko Conglomerate. The Dalan Formation is Trassic in age composed of interbedded well-bedded claystone and sandstone with a typical turbidite sequences. The Duna Formation is Jurassic in age, consisting of interbedded pelagic limestone and fossil (ammonites and belemnites) rich beds. The Kuma Formation is Upper Cretaceous to Eocene age comprising well-bedded medium beds pelagic limestone with abundant planktonic forams. The Waeken is Oligocene- Miocene age and comprises micaceous mudstone. The Wakatin Formation consists of light gray massive reefal limestone containing corals, sponge, algae, bivalves and benthonic foraminifers. The Leko Formation has a Pleistocene age consisting of conglomerate. Structural geology of this area comprises anticline, syncline, and normal fault that relats to the block faulting. The presence of reservoir and source rocks and also fold structure may play an important role in hydrocarbon prospective of the area. Keywords: interbedded pelagic limestone, turbidite sequences, chert layers, hydrocarbon

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