Geology and structural evolution of neoproterozoic rocks of Tahtai Logomti Area, Tigrai, Northern Ethiopia

Abstract

The current study examines the metamorphism, petrography characteristics, and geological structures to construct a detailed geological map of the Tahtai Logomti region. The rock types include low-grade metavolcanic, metavolcanoclastic, carbonate, and clastic metasedimentary. Both petrographic description and field studies were conducted to accurately identify the different lithologies, structural features and mineral assemblages. Field and petrographic observations show rocks that have undergone low-grade metamorphism and fall within the lower greenschist facies. Three distinct phases of deformations (D1, D2, and D3) were identified and correlated with the previous classifications. According to the result, the rocks exhibit an NW–SE trend of joints oriented vertically to sub-vertical and a NE-SW trend of foliation, consistent with the regional trend of the Mai-Kenetal syncline. Hydrothermal-induced epidotization, chloritization, and sericitization are common in the study area.