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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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Petrology of Lava from The Maninjau Lake, West Sumatera H.Harahap, Bhakti; Z.Abidin, Hamdan
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 6 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Andesitic lavas and rhyolitic tuffs are the main products of the Maninjau Lake during Pleistocene. The lava is distributed up to radius of 20 km, whiles the tuff 100 km that suggests a high explosive volcanic. The lava is exposed beautifully along the road from Bukit Tinggi to Lubuk Basung mapped as Qamj on the 1:250 000 geologic map of Padang Quadrangle. The lava is having sheeting joint in some parts, dark gray, highly porphyritic in texture with phenocrysts of plagioclase, clino- pyroxene, ortho-pyroxene and opaques. Quartz phenocryst occurs in rhyolite lavas that are rarely found in the area. Xenoliths of diorite are occurred in some andesite. The lavas have narrow range in silica composition ranging from 54-60 wt % and rarely up to 69 wt%. K2O versus SiO2 relationship shows that analyzed samples belong to calc-alkaline series which are mainly of high-K. While the trace element of the rocks is summarized on the spider diagram, here their patterns strongly resemble the typical of arc lavas with enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE) relative to high field strength elements (HFSE) and heavy REE (HREE). More over, these patterns show an Nb resembling the arc type magma commonly resulted from subduction, whether in island arc or active continental margin. The geochemical characteristic of the lava from Maninjau Lake is a lower concentration of Ba, Sr and La than other active continental margin like the Andes volcanic rocks. Like many other subducted related rocks, the andesite characterize a very evolved magma, where they have low MgO concentrations (3 wt%) with Mg# 30-53. According to the plate tectonic model, Sumatera is on the continental side to subduction process since Eocene until the present. The presence of subducted magma character in Maninjau Lake area was argued to have been accounted during the eastward subduction of the India-Australia Oceanic Crust. It seems also that Sumatra Fault Zone is a very important agent to conduit magma onto the surface in the Barisan Ranges including the lava resulted from Maninjau Lake. Keywords :  petrology, andesitic lava, rhyolitic tuff, Maninjau, Pleistocene
STRATIGRAFI DAN SEDIMENTOLOGI ENDAPAN DATARAN PASANG-SURUT DI KALI TULIS, BANJARNEGARA Bachri, Syaiful; Slameto, Edi; Nurdiana, Indra
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 3 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The tidal flat deposits of the Merawu Formation in Kali Tulis belongs to the Merawu Formation, and can be divided into two members, i.e. the lower part or the mudstone member, and the upper part or the sandstone member, with gradational contact between the two members. The lower parts is dominated by mudstone which is mostly deposited in mud flat environment, while the upper part is dominated by sandstone which is dominantly deposited in sand flat environment. Some sandstone layers in the lower part contains foraminifers of Early – Middle Miocene age, whereas the occurrence of fossils in the upper part has not been known so far. Sedimentary structures found in the two members include herring-bone structure, small scaled slump, parallel and cross laminations, bioturbation, flute cast, bed load, and fining upwards grain size. The sandstone of the two members contains volcanic rock fragments abundantly, suggesting that the provenance is volcanic rock in volcanic arc.Keywords: sand flat, mud flat, herring bone structure, Merawu Formation
BIOSTRATIGRAFI NANNOPLANKTON DAERAH RAJAMANDALA Wibowo, Unggul Prasetyo; Kapid, Rubiyanto
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 4 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Analisis biostratigrafi nannoplankton dilakukan pada 26 sampel spot sampling yang berasal dari daerah Rajamandala, Padalarang, Kabupaten Bandung, Provinsi Jawa Barat. Hasil data lapangan pada lokasi penelitian di daerah Rajamandala dijumpai adanya 6 satuan batuan dimana berdasarkan analisis biostratigrafi nannoplankton di 6 satuan batuan tersebut didapatkan kisaran umur sebagai berikut: satuan batupasir konglomeratan berumur tidak lebih muda dari Eosen Akhir dapat disebandingkan dengan Formasi Bayah yang berumur Eosen Tengah-Akhir; satuan batulempung berumur Eosen Akhir - Oligosen Akhir dapat disebandingkan dengan Formasi Batuasih yang berumur Oligosen Akhir; satuan napal berumur Oligosen Akhir - Miosen Awal dapat disebandingkan dengan Anggota Napal Formasi Rajamandala yang berumur Oligosen Akhir - Miosen Awal; Satuan batupasir-batulempung berumur Miosen Awal – Miosen Tengah bagian bawah dapat disebandingkan dengan Formasi Citarum yang berumur Miosen Awal; satuan breksi vulkanik berumur Miosen Tengah dapat disebandingkan dengan Formasi Saguling yang berumur Miosen Tengah; sedangkan satuan batuan vulkanik tufaan yang menutupi Formasi Saguling dapat disebandingkan dengan satuan batuan produk vulkanik tufan Kuarter.Kata kunci: Biostratigrafi, nannoplankton, nannofosil, Rajamandala.
ANNELID TEREBELLINA MACKAYI (BATHER) FROM MIDDLE TRIASSIC KESKAIN FORMATION, MISOOL ARCHIPELAGO, WEST IRIAN JAYA Hasibuan, Fauzie
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 2 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Terebellina mackayi is an annelid fossil species which forms a tubular agglutinated body. It is a Middle Triassic taxon which has a common distribution in the world and has been recorded from Sumatera, Thailand, Misool, Timor, and New Zealand. A collection of small sized specimens of the species from the Keskain Formation (Misool) of Anisian to Ladinian age is here redescribed and a global correlation is attempted. Terebellina mackayi is commonly found in a random orientation of distribution within beds. The organism which is constructed of tubular shape remains enigmatic but was probably suspension feeder rather than browser, deposit feeder or active predator. Terebellina mackayi lived in a fine grained black silt substrate (infauna) rich in organic detritus. Keywords: Keskain Formation, Annelid, Terebellina mackayi, Anisian, Ladinian
STRUKTUR GEOLOGI BAWAH PERMUKAAN DANGKAL BERDASARKAN INTERPRETASI DATA GEOLISTRIK, Studi Kasus Sesar Palu Koro Marjiyono, Marjiyono; Kusumawardhani, H; Soehaimi, A
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 1 (2013): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The existence of the Palu-Koro Fault, as an active lateral fault, has no doubt. Beside seismicity indications, geodetic observations has also proved the movement of this fault. However, subsurface studies in this section is not yet widely performed. Observation of geoelectric resistivity in Palu-Koro Fault zone has been performed at several sites around of this section. Results of analysis showes the presence of fault structures observed from offsetted bedrock as step over fault.Keywords : geoelectric, resistivity, Palu-Koro Fault, step over fault.
BIJIH BESI DI DAERAH BONTOCANI KABUPATEN BONE SULAWESI-SELATAN Utoyo, Harry
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 5 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The iron ore located at Bontocani, Bone Regency, South Sulawesi is found in the form of boulders. The iron ore is associated with intrusions of granodiorite, pegmatite granodiorite and quartz as a result of moving up magmatic liquid containing iron ore, then it is enriched by the magmatic liquid remains that form granodiorite known as hydrothermal liquid through the cracks.  Sometimes, the iron ore is an aggregate at the contact zone between granodiorite intrusive and limestone. Mineral association occurred among garnet, quartz and ore mineral of magnetite and hematite, then mineralization in the research area is assumed as skarn type.Prospective area located at Tanjung village, in the south part of research area is 187.5 ha accompanied by magnetite mineralization and the degree of Fetotal   = 61,98 %, and at Pake village (220.78 ha) located at the north part and dominated by hematite mineralization with Fetotal = 52,35 %. Keywords: iron ore prospecting, granodiorite,  pegmatite granodiorite,  prospective area
KONFIGURASI GEOLOGI BAWAH PERMUKAAN CEKUNGAN SEDIMEN DAERAH LONG BIA-MUARA WAHAU, KALIMANTAN TIMUR, BERDASARKAN ANALISA ANOMALI GAYABERAT Setyanta, Budi
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Peta anomali Bouguer Lembar Long Bia-Muarawahau memperlihatkan kenampakan daerah rendahan dan daerah tinggian dengan beberapa daerah spot-spot bulatan kecil anomali positif. Dua model bawah permukaan geologi AB dan CD berdasarkan data gayaberat memperlihatkan bahwa batuan alas daerah ini adalah kerak granitik dan fragmen-fragmen ofiolit. Model bawah permukaan geologi CE dibuat untuk menjelaskan geodinamika daerah tersebut. Model bawah permukaan gayaberat yang berbasis tektonik kompresi dan sesar-sesar anjak cocok untuk diterapkan di daerah Longbia-Muara Wahau karena sesuai dengan perkembangan tektonik di kawasan Laut Cina Selatan dan Selat Makassar. Cekungan sedimen yang terbentuk di bagian barat lebih disebabkan oleh lenturan kerak bagian bawah (deformasi plastis) yang diikuti sedimentasi. Kata Kunci : Anomali Bouguer, model bawah permukaan gayaberat, geodinamika, tektonik kompresi
Peran Deformasi Pensesaran Mendatar Terhadap Pembentukan Beberapa Cekungan Kecil Paleogen di Sumatera Barat dan Jambi Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 4 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Peleogene small basins (sub-basins) occur in West Sumatra and Jambi, either in the volcanic arc or in the southwestern margin of the Central Sumatera Basin area. According to previous reports, the small basins were developed due to regional extensional tectonics. On the basis of radar image interpretation, supported by field observation on some structural features, the small basins are interpreted to have been formed by a regional strike-slip system related to deformation of the Sumatera Fault. Smaller scaled structures may be developed within the strike-slip fault zone, either as strike-slip faults, normal faults, or combined strike-slip and normal faults, forming a braided structural pattern. Convergent movement within the braided zone may result in uplifting of some blocks, whilst the divergent movement will result in a low morphology to form relatively small basins. Keywords: Paleogene Basin, strike-slip deformation, Sumatera Fault, convergent, divergent
POLA STRUKTUR DAN GEODINAMIKA CEKUNGAN BULA, BERDASARKAN ANOMALI GAYA BERAT Setyanta, Budi; Setiadi, Imam
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 1 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Gravity is one of the geophysical methods that can be used to estimate subsurface condition based on the density of rocks. Seram bouguer anomaly map reduced by density 2.67 gr/cc indicates negative anomaly pattern in Bula Basin with anomaly range between ( -50 mgal – 0 mgal). Gravity data analyses were carried out by separating the residual and regional anomalies using moving average filtering and second vertical derivative. The subsurface modeling was done by using gravmag forward modeling software. The results show two regional faults i.e. the norteast-sothwest strike slip fault and the east-west thrust fault. Those faults have different periods. The filtering using moving average and second vertical derivative shows closure areas and fold within Pretertiary rocks that geologically are interesting features.Keywords : Gravity, moving average, second vertical derivative, Bula Basin
SISTEM MINYAK DAN GAS DI CEKUNGAN TIMOR, NUSA TENGGARA TIMUR PETROLEUM SYSTEM IN THE TIMOR BASIN, NUSA TENGGARA TIMUR Koesnama, Koesnama; Permana, Asep Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 1 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Bahasan sistem migas pada makalah ini dikhususkan pada pembicaraan mengenai keberadaan batuan induk, batuan waduk, batuan tudung atau penutup, serta perangkap hidrokarbon. Dikenal beberapa macam batuan induk di Cekungan Timor, yaitu serpih hitam dari Formasi Atahoc, Formasi Cribas, dan Formasi Wailuli. Analisis geokimia ataupun petrologi organik menunjukkan bahwa serpih hitam dari ketiga formasi tersebut masuk dalam klasifikasi sangat baik, dan merupakan kerogen tipe III. Berdasarkan analisis petrografi, SEM dan porositas maka yang berpeluang menjadi batuan waduk adalah batupasir dari Formasi Cribas, Formasi Babulu dan Formasi Oebaat, serta batugamping Formasi Aitutu. Sementara berdasar data petrografi dan SEM maka sepih Formasi Cribas dan Nakfunu berpotensi menjadi batuan penutup. Perangkap struktur yang berkembang adalah struktur bunga positif, antiklin landai, antiklin tersesar naikkan, dan graben. Sedangkan perangkap stratigrafi dapat berupa lensa-lensa batupasir dan lapisan batugamping.Kata kunci: Sistem migas, Cekungan Timor, batuan induk, batuan waduk, batuan penutup dan perangkap hidrokarbon.

Page 26 of 35 | Total Record : 341

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