Earth Science Malaysia (ESMY)

This study focuses on the structural mapping and interpretation of some outcrops at Kuntenase and its surroundings and how these structures may be indicative of deformational and tectonic activities and also to understand the potential influence of the lake on rock tectonics. Structural measurements including strike, dip and dip direction data of planar and linear structures were collected to characterize the deformational patterns in the study area. The main rock type identified from the petrographic analysis is a metasediment specifically phyllite and metagreywacke with mineral compositions of pyroxene, biotite, quartz and some amount of plagioclase. Field observations and data analysis was conducted to identify and analyse structural features such as faults, folds, joints, foliations and cleavage, providing insight into the deformation history of the rocks. A particular emphasis was placed on the relationship between the structures and the proximity to the lake Bosumtwi. By comparing the structural characteristics and the orientation of outcrops closer to the lake and those located farther away, variations in deformation intensities were identified. Beds of outcrops closer to the lake were more vertical in orientation compared to the ones farther away. Micro-structures observed included microlithon, quartz veinlets and stringers and also a micro level deformational rock cataclasite. Using the law of cross-cutting relationship – since dating has not been done to tell specifically which one is older- the structures being cut across are relatively older and the ones cutting being relatively younger. Thus, new structures may have been formed due to the impact crater. The flow pattern of water in the area is along strike of most of the structures NE-SW thus the drainage system is controlled by the structures in the area.