Author(s)

Cengiz Yetiş¹, Bayram Ali Mert², Meryem Yeşilot Kaplan^2*

¹Department of Geology Engineering, Çukurova University, Adana, Turkey.
²Department of Petroleum and Natural Gas Engineering, İskenderun Technical University, Hatay, Turkey.

Demirkazık formation consisting of the limestones and dolomites is common in the Adana, Turkey. In this study, it is aimed to find the origin of dolomitization by preparing a detailed geological map. For this purpose, firstly, thin section/polished section and, chemical analysis of the twenty-one samples characterizing dolomitization of the field were prepared and examined. In the chemical analyzes, 21 samples were determined MgO-CaO ratio. Geological map was prepared by field study and MgO contents of the samples that are known coordinates in the chemical data, and the regions where dolomitization was effective were determined. Dolomitization in these carbonates occurs at early stages and late stages. Two dolomite types are petrographically determined; (1) fine crystalline dolomite (TD-1) with 10 - 25 μm crystal size and (2) coarse crystalline dolomite (TD-2) with 50 - 120 μm crystal size. TD-1 is formed by synsedimentary replacement and TD-2 derived from TD-1. The evidence of dolomitization due to pressure changes in the TD-2 dolomites is evidence of late diagenetic. There are three types of carbonate by chemical data; limestone, dolomitic limestone, calcitic dolomite and MgCO₃ ratio of these is increased respectively. The rate of dolomitization is very variable and at the fracture regions, the Mg ratio increases, indicating that tectonism is the cause of dolomitization.

Dolomite, Limestone, Replacement, Dolomitization

Yetiş, C. , Mert, B. and Yeşilot Kaplan, M. (2017) Origin of Dolomitization in Demirkazık Formation (Adana-Turkey). Journal of Geoscience and Environment Protection, 5, 135-146. doi: 10.4236/gep.2017.56014.