PETROGRAPHIC AND GEOCHEMICAL CHARACTERISTICS OF DOLOMITES OF KIZILOREN FORMATION (KONYA, TURKEY)

The Upper Triassic-Lower Jurassic Kiziloren formation outcroping around the Kiziloren mountain, 40 kin to the west of Konya begin with dolomite at the base and, grades upward into calcitic dolomite, dolomitic limestone and limeston,. Dolomites are two types; mimetic and non-mimetic. In mimetic dolomit, pellet fossils, ooid and intraclast were poartially or totaly preserved. In non-mimetic dolomite, the depositional texture were totally destroyed. It is composed of euhedral, hemihedral, dirty-brownish coloured, non zoned and fine to coarse dolomite crystals with linear and intended crsytal boundaries. The CaCO(3), MgCO(3) ratios and Sr, Mn, Fe content of dolomites are determined as % 53-61 mol, % 39-47 mol and 65-171 ppm, 3-37 ppm, % 0,01-0,12 respectively. Having a MgCO(3) ratio close to % 50 and a low Sr content are interpreted as the dolomite in the study area was approached to the stoichiometric dolomite. The Sr(+2)/Ca(+2) ratio of dolomitization solution was calculated as having a range between 0,023-0,066. This is higher than present day sea water, and can be interpreted as either the Sr(+2)/Ca(+2) ratio of oceanwater when Kiziloren formation formed was higher than today seawater or unsufficient removal of Sr in diagenetic environment during transformation processes of aragonitic limestone to dolomite.