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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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Identification of Adakite from The Sintang Intrusives In West Kalimantan Hartono, Udi; Suyono, Suyono
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 3 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Sintang intrusives are widely exposed in West Kalimantan, and as reported by previous workers, consisting of high level intrusives of stocks, plugs, dykes and sills of microdiorite, microgranodiorite, granite/ microgranite, quartz diorite, dacite, andesite, and minor rhyolite and rhyodacite. However, a careful study of published geochemical data gives a result that the rocks are of adakitic type. Considering the tectonic development of the South China Sea and northwest Kalimantan, the adakite was probably originated from magma as a result of melting of the subducted South Cina sea oceanic crust beneath Kalimantan continent. The subduction started in the Late Oligocene when the crust was still young. Keywords : adakite, Sintang, intrusive, Late Oligocene
PEMATANG PANTAI PURBA SEBAGAI PERANGKAP GAS BIOGENIK DI PESISIR INDRAMAYU PROVINSI JAWA BARAT SUATU KAJIAN PENDAHULUAN Kurnio, H.; Naibaho, T.
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 5 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Biogenic gas potency in Indramayu coastal area had been studied by coastal characteristic mapping, soft sediment sampling using specially designed gravity corer and information of gas seeps from local people. The preliminary study was carried out through gatherings of secondary data from many sources which meant to better understand the forms of paleo-dunes in coastal zone of Indramayu surround Cimanuk River deltaic system that already buried subsurface. The study found out that this alternative gas potency is trapped within paleo-beach sand in Indramayu coastal zone. The study also found that the buried beach sand at southeast of Cimanuk River delta's system parallel to northwest-southeast orientation of recent coastline is bearing biogenic gas potency. Based on field observation, the locations of gas seeps take place on the beach sand mentioned. The study also performed utilization of biogenic gas by community south of Indramayu.Key words: paleo-coastal dune, biogenic gas trap, Indramayu coastal zone.
Tektonostratigrafi Cekungan Timor di Bagian Barat Pulau Timor Bachri, Syaiful; Permana, Asep Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 2 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Cekungan Timor terletak di bagian barat Pulau Timor, dan Pulau Timor sendiri secara keseluruhan tersusun oleh 3 (tiga) satuan tektonostratigrafi, yaitu satuan para-autokton, satuan alokton dan satuan autokton. Satuan para-autokton berasal dari Paparan Baratdaya Australia yang terpindah-tempatkan ke wilayah Timor bersama-sama (menumpang) di atas batuan alasnya. Sementara satuan alokton berasal dari Busur Banda pra-tumbukan yang tersesar-naikkan di atas satuan para-autokton. Adapun satuan batuan yang terendapkan tidak selaras di atas kedua satuan lainnya disebut satuan autokton yang terendapkan sebagian sin-orogenik sampai pada umumnya pasca orogenik. Satuan para-autokton berumur Perem sampai Jura Tengah, sementara satuan alokton berumur Jura Akhir sampai Pliosen. Di lain pihak, satuan autokton berumur Miosen Akhir sampai Plistosen Awal.Kata Kunci - Cekungan Timor, Timor bagian barat, satuan para-autokton, alokton, autokton.
MIKROTREMOR DAN PERCEPATAN TANAH MAKSIMUM KOTA MAKASSAR Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Makassar city has a relatively far distance > 50 km to the seismic source zone,but the soft soil condition in this area produced significant amplification of earthquake ground shaking. Therefore, a microzonation study as a risk analysis of local site response is basicaly needed. In this research, the earhquake microzonation map was made based on a soil dinamic characterization of a microtremor investigation. The soil having a long predominant period is more risky compared to that having short period of soil. The dominant period of soil at this investigation was calculated based on horizontal towards vertical spectral ratios (H/V) of microtremors, meanwhile the microzonation map of Makassar City was made based on the variation of a predominant period. The result of calculation shows that the south-western part of Tamalanrea district has the longest predominant period. This predominant period gradually dereases to the eastern part of Makasasar City. Peak ground accelaration studies show the maximum ground accelaration is not defferent between one and the other districts. The maximun ground accelaration belongs to Biringkanaya,Tamalanrea and Manggala districts (58,80 gal, 56,84 gal and 55,86 gal for 500 years) in the eastern part of Makassar City. This ground accelaration value becomes less to the west, because the main seismic source zone of Walanae active fault is located at the eastern part of Makassar City. Keywords: microzonation, microtremor, earthquake source zone, site respons, peak ground acceleration
KONDISI TEMPERATUR, WAKTU, DAN ph REAKSI UNTUK MENGOPTIMASI PROSEDUR STANDAR ANALISA PLATINUM DENGAN EKSTRAKSI ATOMIC ABSORPTION SPECTROMETRY Irzon, Ronaldo; Kurnia, Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 14, No 4 (2013): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Atomic Absorption Spectrometry (AAS) merupakan salah satu perangkat yang familiar dalam pengujian kadar kimia karena memilik kapabilitas tinggi dengan konsumsi waktu, biaya, dan tenaga yang tidak besar untuk mendapat presisi uji yang cukup baik. Penelitian mengenai optimasi perangkat ini telah banyak dilakukan. Pusat Survei Geologi turut melakukan studi terhadap perangkat ini untuk pengujian logam mulia, salah satunya adalah Platinum (Pt) terhadap contoh geologi. Percobaan ekstraksi Pt menggunakan kelat Amonium Pirolidin Carbamat dan pelarut Metil Isobutil Keton sesuai skema literatur memberikan recovery 14 - 20% yang berarti proses belum baik secara kuantitatif. Tulisan ini mengurai standar prosedur yang sudah ada dan meneliti pengaruh variabel termperatur, waktu, dan pH ekstraksi Pt pada beberapa konsentrasi standar sebelum diperiksakan kandungannya menggunakan AAS. Hasil percobaan menasbihkan bahwa temperatur ekstraksi terbaik adalah pada keadaan kamar, dengan lama reaksi 60 menit antara ion Pt dan APDC. Disimpulkan bahwa kondisi pH 2,0 merupakan tingkat keasaman terbaik. Proses ekstraksi hasil penelitian ini cocok pada Pt dalam matrik yang tidak banyak mengandung logam lainnya seperti dalam air atau pada katalis. Pengukuran dalam matrik berkondisi sebaliknya, seperti pada Saprolit masih memerlukan penelitian lebih lanjut terkait selektifitas APDC terhadap logam berat lain. Prosedur standar ini dapat dikembangkan agar lebih tangguh untuk diterapkan pada laboratorium manapun dan diajukan sebagai standar pengujian Pt di IndonesiaKata Kunci: Platinum, AAS, standar, ekstraksi, kondisi reaksi.
UMUR FORMASI NAMBO DI SULAWESI TENGAH DENGAN ACUAN KHUSUS FOSIL MOLUSKA Hasibuan, Fauzi; Kusworo, A.
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Nambo Formation distributed in the eastern of Sulawesi is well exposed along the Nambo River, Luwuk, Central Sulawesi. In this locality it consists of calcareous grey shale, with some calcareous sandstone interbeds,  about 50 m thick. The molluscan fauna is composed among others of Retroceramus (R.) haasti, Malayomaorica malayomaorica, B. aucklandica similis, Belemnopsis moluccana, B. galoi, B. stolleyi and B. mangolensis. It is concluded that based on the molluscan faunal assemblage, the age of the formation is Tithonian. It is correlable with the upper part of the Buya Formation in the Sula Islands. Keywords : Nambo Formation, molluscs, Tithonian, Nambo River, Central Sulawesi, Buya Formation, Retroceramus, Malayomaorica,  Belemnopsis.
Struktur Geologi Bawah Permukaan Cekungan Bintuni Berdasarkan Data Gaya Berat Handyarso, Accep; Padmawidjaja, Tatang
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 2 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Bintuni Basin is one of the giant basins in Eastern Region of Indonesia (KTI). Until now there are only few oil and gas production fields in the Bintuni Basin. This case prompted the government to accelerate the discoveries of new oil and gas reserves in Eastern Region of Indonesia, particularly in the Bintuni Basin. Gravity method is one of geophysical method that is commonly used in preliminary studies of sedimentary basins. Bouguer anomaly obtained is reduced by using an average density based on the Nettleton method. Regional–residual anomaly separation is performed based on the spectral analysis. Residual anomaly showed anticline closures with a northwest–southeast directions, and also there are indication of some strike–slip faults which are expected as the result of the compression due to the Pacific Oceanic Plate and the Australian Continent Plate movement. The result from spectral analysis showed that the average depth of the bedrock is up to 6.5 km. Based on the 2.5D subsurface geological structures estimation indicates shallowing basement toward Mogoi and Kamundan district area with some fault structures that allows migration of the hydrocarbon from Pratertier source rocks to the Kais reservoir. Keywords: Bintuni Basin, Bouguer, Residual, SpectralAnalysis, Anticline  
Hubungan Kelompok Maseral Liptinit dan Vitrinit dengan Tipe Kerogen Batuan Sumber Hidrokarbon pada Serpih Formasi Kelesa Bagian Atas, Kuburan Panjang, Riau Zajuli, Moh. Heri Hermiyanto; Panggabean, Hermes; Hendarmawan, Hendarmawan; Syafri, Ildrem
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

This study focuses on correlation of liptinite and vitrinite maceral to kerogen type of shale from Kelesa Formation in Kuburan Panjang areas, Sumai sub-basin, Central Sumatra Basin. The composition of the organic material consists of vitrinite maceral ranged from 0.2 to 5%, liptinite from 0.6 to 4.7%, the type of minerals in the form of pyrite from 0.2 to 16%, and 0.2 -24.2% of carbonate, as well as clay minerals are the most dominant component ranged between 71.6 -98%. TOC values of the shale range from 1.18% to 7.17%, which indicate ability of the shale as a good source rock. Kerogen type analysis of theshale in the research area tends to indicate I, II and III kerogen types. There is an influence of the liptinite and vitrinite maceral groups abundance to the type of kerogen, where liptinit maceral group tends to produce type I and II kerogen. Key word : Kelesa Formation, Eocene-Oligocene, Central Sumatera Basin, Vitrinite, Liptinite
Karakter dan Proses Pembentukan Rangkaian Fasies Endapan Kuarter di Paparan Danau Maninjau, Kabupaten Agam (Sumatera Barat) Moechtar, Herman
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 1 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Quatenary sediments in the studied area can be divided into fraction of coarse-grained sediments, fine-grained sediments, and both mixed grained sediment. They consist of:  (a) floodplan facies, (b) floodplain facies which are influenced by lake level rising or falling, (C) fluvial channel facies and (e) lake facies.The Quaternary sediments on margin lake Maninjau is the sedimentological response to allogenic mechanism controls. The allogenic controls are the climate, tectonics and lake level. The climate determines water and sediment as wells as the type of intervaI stratigraphic changes that can be recontructed. Tectonic and lake leveI set boundary condition to the energy of sediment supply also occurred.                Keywords: fasies, depositional environment, forming control factor
AN OVERVIEW OF ARC MAGMA PETROGENESIS Hartono, U.; Sulistyawan, R. Isnu H.
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 4 (2011): Jurnal Sumber Daya Geologi
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Abstract

The petrogenesis of subducted-related magmas is complicated, and has been subject of controversy and widely discussed among petrologists, involving multi sources and multi processes. The source of arc magmas includes upper mantle with either MORB-like or OIB-like, the subducted slab which consists of an oceanic basaltic crust and possibly sediments, including material derived either through melting or release of fluid, and the arc crust. The process involves fractionation, assimilation or contamination and magma mixing. There are two types of contamination including source and crustal contaminations. Trace element and isotopic evidences suggest that most arc magmas are derived from melting of upper mantle induced by released fluids and incompatible elements from a subducted oceanic crust. Subsequent fractionation with or without assimilation or contamination and magma mixing would result in more acid magmas. However, crustal-derived magmas, resulted from melting of either subducted slab or lower crust, are also present in some arcs.Keywords : arc magmas, petrogenesis, overview

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