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Characteristics of the Triassic Source Rocks of the Aitutu Formation in the (West) Timor Basin Permana, Asep Kurnia; Kusworo, Aries; Prastian, Andi Heri
Indonesian Journal on Geoscience Vol 1, No 3 (2014)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3653.822 KB) | DOI: 10.17014/ijog.v1i3.192

Abstract

DOI:10.17014/ijog.v1i3.192The Triassic rocks of the (West) Timor Basin have been identified that was mainly deposited in the  marine environment. The fine grained clastics and carbonate  rocks of this Triassic marine  facies are considered to be the most promising source rocks potential in this basin. In this paper we present geochemical and petrographic data from outcrop samples of the Triassic carbonate Aitutu Formation, due to emphasized the organic maturation, kerogen type of the organic matter and the origin of the organic matter.  A representative of selected sample were subjected to the Rock-Eval Pyrolisis, vitrinite reflectance and thermal alteration index, bitumen extraction, were analyzed on the GC-MS. The samples were collected from marine deposit of the Triassic Sequence. The TOC values of the analyzed sample range between rich and rich organic richness (0.51% - 9.16%, wt.%, TOC), which consists mainly of type II and III kerogen and the organic matter consider to be predominantly oil/gas prone and gas prone potential. The thermal maturity assessed from Tmax, TAI, and vitrinite reflectance shows an immature to early peak mature stage of the organic matter. The GC-MS analyses of the biomarkers indicate mainly the organic matter derived from mixed source rocks facies containing alga debris and higher plant terrestrial origin.
Dosis Radiasi Gamma Beragam Jenis Batuan di Wilayah Utara Pulau Bangka Irzon, Ronaldo; Kurnia, Kurnia; Rohiman, Asep; Yurnaldi, Dida; Kusworo, Aries
Jurnal Lingkungan dan Bencana Geologi Vol 13, No 3 (2022)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v13i3.444

Abstract

Radioaktivitas dapat terjadi secara alami maupun disebabkan oleh aktifitas manusia. Salah satu radioaktivitas alami terdapat pada batuan yang bergantung kepada jenis dan komposisinya. Studi ini bermaksud untuk menjelaskan dosis radiasi beberapa jenis batuan yang teradapat di wilayah Pulau Bangka bagian utara. Perangkat Geiger–Müller counter tipe FH 40 G Multi-Purpose Digital Survey Meter dari Thermo dipergunakan untuk mengukur dosis radiasi batuan pada penelitian ini. Pengukuran pada setiap sampel dilakukan setidaknya tiga kali dan nilainya telah diolah secara statistik untuk menapatkan hasil yang valid. Jenis batuan dengan tingkat dosis radiasi tertinggi hingga terendah adalah granit, sedimen tersilisifikasi, sedimen, dan diabas dengan rerata 466 nSv/h, 116 nSv/h, 90 nSv/h, dan 74 nSv/h secara berurutan. Penelitian ini membuktikan bahwa granit adalah bahan bangunan utama yang digunakan oleh masyarakat Pulau Bangka meskipun batuan tersebut memiliki resiko radioaktif terbesar relatif terhadap jenis batuan lain.
Review on Granitic Rocks in Sumatra: Intrusion Process, Classification, Mineralization, and Potential Uses Irzon, Ronaldo; Syaeful, Heri; Kusworo, Aries; Wahyudiono, Joko; Ngadenin
EKSPLORIUM Vol. 43 No. 1 (2022): MAY 2022
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2022.43.1.6471

Abstract

Granitic rocks are widely distributed in Sumatra and surrounding areas. These granitoids are classified into several granite provinces of Southeast Asia with different intrusion processes and specific characteristics. This paper aims to review the intrusion of granitic rocks in Sumatra and describe the opportunities associated with it. Granite rocks are used to manufacture cultural heritage, works of art, and ornaments because of their weathering resistance, color diversity, and hardness characters. S-type granite intrusion in Sumatra might be associated with tin mineralization while silver-gold with the I-type. Theoretically, granite contains more REE than other igneous rocks. Mining and extraction difficulties complicate the direct REE exploitation from fresh granite. A-type granite relatively contains more REE than the other types, but this type of granite is not correlated with certain provinces. Indonesia has a tropical climate which is prone to weathering. Therefore, it is possible for REE and/or bauxite enrichments in the granite weathering horizon. Granite is assumed to be a potential source of uranium and thorium, especially for the S-type, because it is formed through the compression of sediments that can absorb these radioactive elements from the continental crust.