Distribution and Mineralogical Characteristic of Raya Volcanics, West Kalimantan

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Published: Nov 30, 2021
DOI: https://doi.org/10.17146/eksplorium.2021.42.2.6511
Keywords:
Raya Volcanics, distribution, petrography, micro-XRF, magmatic process

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Windi Anarta Draniswari
Center for Nuclear Minerals Research and Technology – ORTN-BRIN
Fadiah Pratiwi
Center for Nuclear Minerals Research and Technology – ORTN-BRIN
Ngadenin Ngadenin
Center for Nuclear Minerals Research and Technology – ORTN-BRIN
I Gde Sukadana
Center for Nuclear Minerals Research and Technology – ORTN-BRIN
Tyto Baskara Adimedha
Center for Nuclear Minerals Research and Technology – ORTN-BRIN
Roni Cahya Ciputra
Center for Nuclear Minerals Research and Technology – ORTN-BRIN
Ekky Novia Stasia Argianto
Center for Nuclear Minerals Research and Technology – ORTN-BRIN
Erwina Aminarthi
Department of Geology, Faculty of Minerals Technology, Institut Teknologi Nasional Yogyakarta
Vertika Dhianda Supraba
Department of Geology, Faculty of Minerals Technology, Institut Teknologi Nasional Yogyakarta

Abstract

There are several volcanic rocks in a radius of 150 km from where the Nuclear Power Plant (NPP) site project in West Kalimantan. The Mesozoic volcanic rocks have not been characterized for volcanic hazard evaluation purposes due to their old age. However, the distribution of Raya Volcanic Rocks that covers the site area and the wider area up to 150 kilometers from the site makes this rock group quite important to be characterized to find out how its activities in the past. This paper’s objective is to comprehend the distribution and characteristics of Raya Volcanic Rocks for NPP site volcanic hazard evaluation purposes. Fieldwork and lineament analyses were conducted to map and interpret the distribution of Raya Volcanic Rocks while mineralogical analysis using petrography and micro XRF were conducted to characterize the Raya Volcanic Rocks. The distribution of Raya Volcanic Rocks that relatively show NNW–SSE orientation is probably controlled by the NNW–SSE fault system. The analyses resulted that Raya Volcanic Rocks erupted as lava flows derived from mafic magma as a product of mantle partial melting that underwent crystal fractionation, injection of hotter/more Ca-rich magma, and magma mixing on an open-system magmatic process.

Article Details

How to Cite
Draniswari, W. A., Pratiwi, F., Ngadenin, Sukadana, I. G., Adimedha, T. B., Ciputra, R. C., … Supraba, V. D. (2021). Distribution and Mineralogical Characteristic of Raya Volcanics, West Kalimantan. EKSPLORIUM, 42(2), 77–90. https://doi.org/10.17146/eksplorium.2021.42.2.6511
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Vol. 42 No. 2 (2021): NOVEMBER 2021
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