Multiage Tectonites Of Pervomaiska Fault Zone
Event name: 12th International Conference on Monitoring of Geological Processes and Ecological Condition of the Environment
Session: Monitoring and modelling of natural hazards and new technologies for risk minimization and prevention
Publication date: 16 November 2018
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The paper explores the stages of granitization of the leukocratonic blastomelonites under the intersection by melonocratonic tectonites. The study is focused on the di-feldspar migmatites and the granite-gneisses, which are the tectonites of the Pervomaiska granite-and-gneiss monocline. The field under research reveals the prevalence of the blastomelonites varying in light gray, light pink, pink colors and average-to-coarse-grained, pegmatoid, porphyric-blastic, heavily schistose, and banded texture and structure. Early leukocratonic pegmatoid tectonites occur subvertically and are intersected by melonocratonic tectonites a 45o. Rotational amplitude and vector being vague to define, the juxtaposition of the deformed fragments of the pegmatite vein in the late tectonites is assumed to have been affected by low amplitude of shear or thrust deformational processes, though. The hypothesis made is further confirmed by the occurrence of porphyroclastic Fsp as well as quartz-feldspar aggregates. Leukocratonic tectonites being intersected by melonocratonic ones are not brought into question. What raises further consideration is the correlation of the deformational processes with the time of Palaeo-Proterozoic granitization. Thus, the carried microtectonic research reveals late and post granitization deformations to be in sync, whereas granitization strains are considerably variable.