PETROGRAPHY AND THERMODYNAMIC REACTIONS OF SOME OF THE ROCKS IN THE BANKET SERIES OF THE TARKWAIAN SUPERGROUP

Matthew Coffie Wilson () and Lydia Nnipaa Osei Opuni ()
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Matthew Coffie Wilson: Kwame Nkruma University of Science and Technology, Department of Geological Engineering, University Post Office, Kumasi-Ghana.
Lydia Nnipaa Osei Opuni: Kwame Nkruma University of Science and Technology, Department of Geological Engineering, University Post Office, Kumasi-Ghana.

Geological Behavior (GBR), 2023, vol. 7, issue 1, 22-29

Abstract: The Banket Series, which is a paleoplacer deposit, is the third formation in the stratigraphy of Tarkwaian Supergroup. This project seeks to study petrographically; the lithologies in the banket series to confirm the rocks identity as already known or state otherwise. Two different photomicrographs of each of the rock samples, coupled by their petrographic descriptions were obtained from the laboratory. The main areas of our arguments were based in Bowen’s reaction series, metamorphic facies of the rocks, the earth structure and thermodynamic phase diagrams. The sampled rocks can be confirmed with the help of thin sections and mineral facies to be conglomerate, dolerite and quartzite. The minerals in the banket series range in temperature between 200°C and 800°C. The abundance of silica (SiO2) in the rocks conglomerate, dolerite and quartzite are of crustal origin, whereas pyroxene and olivine originate from the upper mantle. The common stable minerals in the studied rocks, namely, amphibole, chlorite and plagioclase are less likely to change compared to the other minerals in the rocks. The three (3) different metamorphic facies of the rocks conglomerate, dolerite and quartzite are respectively greenschist, epidote-amphibolite and amphibolite facies.

Keywords: Stratigraphy; metamorphic facies; mineral stability; meta-volcanics; ternary plot; phase diagram (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbngbr:v:7:y:2023:i:1:p:22-29

DOI: 10.26480/gbr.01.2023.22.29

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