Petrographic and geochemical characterization of sandstones in upper level of ophiolitic melange in Central Pontides

Advanced Engineering Days, cilt.4, ss.96-99, 2022 (Hakemli Dergi)

Tectonic slices of different origins are observed in eastern of Kargı (Çorum). These slices,

occurred via metamorphic units and lithologies of ophiolitic mélange which are observed

with tectonic contact. The Çalarasın formation is observed at the upper levels of the

ophiolitic mélange, which extends to the east of Kargı (Çorum) in the Central Pontides.

The formation is composed of thin-bedded siltstone intercalated sandstone-shale and

mudstone alternations. The sandstones of the formation include quartz, plagioclase,

calcite, biotite, chlorite and volcanic rock particles. The sandstones were analyzed for

geochemical properties and provenance traces, respectively. According to these

analyzes, SiO2 % is found between 26.46-71.78%, Al2O3% 5.22-10.86, Fe2O3% 2.89-7.11

and CaO% 6.13-36.02 respectively. When trace elements are evaluated, Sc content

ranges from 76.13-201.03 ppm, and Y content ranges from 9.54-55.11 ppm. The

sandstones are poor in terms of REE. It was determined that the sandstones were fed

from the intermediate and mafic magmatic sources and tectonically represented the

active continental margin and the island arc area.