Petrographic and optical cathodoluminescence study of detrital quartz: Provenance indicator for the sediments of the campanian Lokoja-Basange formation, Anambra Basin, Nigeria

Abstract

The provenance of the Campanian quartz arenitic sediments of the Lokoja-Basange Formation had been investigated using integrated optical Cathodoluminescence and Petrographic characteristics approach. Results showed the presence, in abundance, of detrital quartz with characteristic dull red to violet CL colour and mottled texture. The common occurrence of compactional features such as Boehme Lamella, and micro fracturing within individual quartz grains, but without corresponding compressional features at the grain to grain boundaries suggested complex diagenetic history for the sandstones of Lokoja-Basange Formation. These features were indication of quartz derived from low grade metamorphic and which had undergone multiple reworking before final deposition. The sediments of the formation were texturally immatured and mineralogically matured, suggesting a high degree of chemical weathering.

Keywords: Provenance, Cathodoluminescence, Campanian, Anambra Basin, Lokoja-Basange Formation