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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Joko Wahyudiono
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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Model Fasies Batuan Karbonat Formasi Wainukendi di Cekungan Biak-Yapen, Papua Asep Kurnia Permana; Joshua Shima; Sigit Maryanto; Joko Wahyudiono
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 | DOI: 10.33332/jgsm.geologi.v20i2.129

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.
POLIDEFORMASI PADA BATUAN KELOMPOK EMBALUH-RAJANG DI DAERAH BHAYANGKARA, KALIMANTAN TIMUR Joko Wahyudiono; Baharuddin Baharuddin
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 5 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i5.152

Abstract

The Embaluh-Rajang Group in Bhayangkara region had suffered polyphase deformation. Regional fold shown in Landsat Imagery exhibit at least three periodes of deformation on the study area. The first deformation D1 main principal stress (s11) was directed relatively to east-west and resulted regional folds on the north-south direction. The second deformation D2 main principal stress (s12) was directed relatively to northwest-southeast and formed northeast-southwest trending regional folds. The third deformation D3 main principal stress (s13) was directed relatively to east northeast-west southwest and resulted local folds on the north northwest-south southeast trending direction. Faults occurred in study area could be classified into six main groups. They are fault group of A (north-south), B (north northeast-south southwest), C (northeast-southwest) and D (southeast-northwest), E (south southeast-north northwest).Keywords : polydeformation, fold, fault, regional structure
Karakteristik Petrologi dan Geokimia Batuan Gunungapi Berumur Oligosen Akhir - Miosen Di Daerah Gunung Muro, Kalimantan Tengah Joko Wahyudiono
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 2 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i2.266

Abstract

Mount Muro is located in Purukcahu District of Central Kalimantan and geologically dominated by Late Oligocene-Miocene volcanic rocks. The purpose of this research mainly to understand the geodynamic evolution, including rock type, magmatic suites and tectonic environment during Late Oligocen to Miocene of the research area. Eight samples from that region were collected and prepared for petrographic and geochemistry analyses. Petrography analysis using polarization microscope was   carried out for rock classification, whereas XRF and ICP were used mainly to detect the presence of major, trace and rare earth elements. Based on petrographic analyses the eight rock samples studied can be classified into basalt, andesite-basalt and diorite. Cross plot of weight percent SiO2  versus weight percent (Na2O + K2O) revealed that the rocks are differentiated into basalt, andesite-basalt, basalt trachy-andesite to andesite. The weight percent SiO2 versus weight cross plot percent K2O demonstrated that rocks samples of the studied area included in calc-alkaline magmatic series. This implies that the rock samples were originally from a convergent plate margin tectonic environment. The existence of Nb through in the spider diagram has been explained in terms of retention of this element in the source during partial melting. Keywords: petrology, geochemistry, tectonic, geodynamics, magmatic series
Karakteristik Minyak Bumi di Blok Bula dan Blok Oseil, Pulau Seram, Maluku Joko Wahyudiono; Ryandi Adlan; Sam Permanadewi; Akhmad Khahlil Gibran
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 4 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i4.384

Abstract

Oil that produced in a petroleum system must have specific characteristics depend on the source rocks. These characteristics are able to be understood by analyses of organic geochemistry. Gas Chromatography - Mass Spectrometry (GC-MS) is a very accurate tool for determining the characteristics of oil and gas. This research shows the evidence that oil samples taken from Bula Block and Oseil Block, Seram Island have the same source.Keywords: petroleum system, organic geochemistry, Bula, Oseil, Seram Island
Co-Authors Akhmad Khahlil Gibran Asep Kurnia Permana Baharuddin Baharuddin Joshua Shima Ryandi Adlan Sam Permanadewi Sigit Maryanto