Very Low Grade Metamorphism of Upper Paleozoic-Lower Mesozoic Sedimentary Rocks Related to Burial and Thrusting in the Central Taurus Belt, Konya, Turkey

摘要

Metasedimentary and sedimentary- rocks that represent the allochthonous Bolkardagi Unit crop out in the Central Taurus Belt. Devonian units include mainly slate, metadolomite, metadolomitic limestone, and meusandstone. Slates with slaty cleavage and chlorite-mica stacks are characterized by phyllosilicate. quartz. calcite, dolomite, feldspar, and goethite. Phyllosilicates consist of 2M_1 and lesser amounts of 1M muscovite IIb chlorite, pyrophyllite, paragonite, PM, C-V, C-S. rectorite, and dickite, and reflect conditions of the low epizone-anchizone. In the Carboniferous-Triassic units, limestone, clayey limestone, dolomitic limestone, marl, shale, and sandstone retaining primary textures are composed of calcite, dolomite, quartz, 1M_d illite, chlorite, and I-S. and locally smaller quantities of 2M_1 muscovite, PM, paragonite, pyrophyllite, and rectorite. In contrast, the Triassic formation is made up of calcite. 1M_d illite, I-S, kaolinite, smectite, chlorite, C-S, C-V, dolomite, and quartz. Textural and mineralogical data indicate that development of the diagenetic-metamorphic grade in the Central Taurus was related to sedimentary burial and thrusting; moreover, the metasedimentary rocks were metamorphosed in a typical anticlockwise P-T-t pathway in an extensional setting.