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Textural and mineralogical evidence for a Cadomian tectonothermal event in the eastern Mediterranean (Sandıklı-Afyon area, western Taurides, Turkey)
Authors: mer Bozkaya  Semih Gürsu  Mehmet Cemal Gncüoglu
Institution:

aDepartment of Geological Engineering, Cumhuriyet University, 58140 Sivas, Turkey

bGeneral Directorate of Mineral Research and Exploration, 06520 Ankara, Turkey

cDepartment of Geological Engineering, Middle East Technical University, 06531 Ankara, Turkey

Abstract:In the Sand?kl?-Afyon area, the very low-grade metamorphic Sand?kl? Basement Complex with clastic sediments and Late Neoproterozoic felsic igneous rocks are unconformably overlain by a cover succession with red continental clastic rocks, tholeiitic basalts and siliciclastic rocks with Early Cambrian trace fossils. Illite crystallinity studies reveal that both the basement and cover units were metamorphosed at high anchizonal to epizonal conditions (not, vert, similar 300 °C). Textural data together with the detailed evaluation of the PTb0 grid, however, indicate that this thermal event has multiple phases. The first tectonothermal event was realized at pressures of not, vert, similar 4.2 kb on the basis of b0-data and resulted in development of blastomylonites. This is supported by the presence of dynamo-metamorphosed pebbles within the basal conglomerates of the Lower Paleozoic cover series. The second event is post-Ordovician–pre-Jurassic in age, occurred at lower pressures not, vert, similar 3.2 kb and produced a weakly developed cleavage in the siliciclastic rocks of the cover. The mineralogical/textural data across the basement-cover boundary therefore indicate the removal of an entire metamorphic zone and thus a metamorphic hiatus.

These data suggest that the Taurides were affected by a Late Neoproterozoic event as part of the peri-Gondwana during the Cadomian orogeny.

Keywords:Cadomian  Very low-grade metamorphism  Mineralogy  Peri-Gondwana  Turkey
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