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Abstract
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Article Information:
Geochemistry of Crystalline Rocks from the East of the Upper East Region of Ghana
K.B. Pelig-Ba
Corresponding Author: K.B. Pelig-Ba
Submitted: March 02, 2012
Accepted: April 20, 2012
Published: May 15, 2012 |
Abstract:
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Selected rock samples were collected from outcrops from the eastern part of the Upper East Region
with the aim of determining their chemical composition and classification. Samples were obtained from
granitoids and the Birrimian formation located in Bongo, Talensi-Nabdam, Bawku West and Garu-Tempane
Districts. Rocks were identified mineralogically using hand lenses. The composition of the samples was
determined using X-Ray Fluorescence (XRF) after which several quantitative and qualitative techniques were
employed to analyse the data. Some of these techniques included physical examination, Chemical Alteration
Index (CIA), scatter plots, discrimination diagrams and Aluminium Saturation Index (ASI). The mineralogical
analysis showed that the rocks generally contained K-feldspar, plagioclase, muscovite, hornblende, quartz and
biotite as major minerals. Physical examination revealed that samples had undergone some alteration that was
not evident at the time of sampling and this was confirmed by calculations using the Chemical Index of
Alteration (CIA). The CIA values of the fresh rocks ranged from 70 to 125 suggesting that the samples had
undergone intensive alteration. Scatter plots and discrimination diagrams suggested that the samples were not
of basaltic origin but were thoeleiitic in character. The Aluminium Saturation Index (ASI) revealed that most
samples were metaluminus and that the majority of samples were sub-alkaline and therefore basic in character.
Key words: Basalt, diorites, granitoids, granodiorites, metaluminus, thoeleiite, upper east region
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Cite this Reference:
K.B. Pelig-Ba, . Geochemistry of Crystalline Rocks from the East of the Upper East Region of Ghana. Research Journal of Environmental and Earth Sciences, (05): 534-545.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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