Tarkwaian Deposits of the Birimian Belt of Houndé: Petrological, Structural and Geochemical Study Burkina-Faso, West AfricaReport as inadecuate




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The Tarkwaian deposits ofthe Birimian belt of Houndé are located in the Baoule-Mossi Paleoproterozoicarea of the West African Craton. The sedimentary units consist of sandstoneheterometric pelitic feldspthic sandstone with locally interbedded breccias,puddings and polygenic conglomerates. Lithic pebbles and macroscopic fragmentsthat are similar to vein type originated quart castings and andesitic-daciticprojections, felsic sub-volcanic rocks evolving from microdioritic tomicrogranite composition are detected in terrigenous sediments. The volcanicpackages form a linear strip composed of basic to intermediate rocks andandesitic to dacitic volcaniclastites.The contacts between these units are not clearly exposed but the differentfacies between the polygenic conglomerates and sandstones show discordanttectonic contacts with the Tarkwaian and the Birimian. The geochemical natureof these Tarkwaian formations is strongly influenced by the relative decline ofthe dominant quartz of feldspars and phyllites. The improperly classified andimmature feldspathic sandstones show context affinities of island arc probablydictated by Birimian lithic products. Sedimentologically, the cross-bedded stratificationand the predominance of sandstone terrigenous lands indicate a deposition in afluvio-deltaic hydrodynamic setting along intermontane Birimian rift. Thesimilarities between these Tarkwaian formations and the typical Tarkwaian ofthe Tarkwa basin in Ghana are probably limited to petrographic and notstratigraphic aspects, which lead to likening them to flyscho?d or molassictardi Birimian deposits.

KEYWORDS

Tarkwaian, Birimian, Sandstone, Polygenic Conglomerat, Molassic, Fluvio-Deltaic

Cite this paper

Koffi, Y. , Wenmenga, U. and Djro, S. 2016 Tarkwaian Deposits of the Birimian Belt of Houndé: Petrological, Structural and Geochemical Study Burkina-Faso, West Africa. International Journal of Geosciences, 7, 685-700. doi: 10.4236-ijg.2016.75053.





Author: Yao Honoré Koffi1, Urbain Wenmenga1, Sagbrou Chérubin Djro2

Source: http://www.scirp.org/



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