Abstract: In this study, it was aimed to determine mineralogical and geochemical properties and differences insources of the deltaic sediments from the area between Deliçay and Tarsus rivers (Mersin). A total of120 samples were taken from 40 different locations and from three different depth intervals to determinemineralogical characteristics of the soils from the study area. Furthermore, a total of 208 samples weretaken for determination of textural and geochemical properties of the topsoils (0-15 cm). Mineralogicalcomposition of soil samples were determined with XRD method, followed by determination of texturaland geochemical properties with Bouyoucos hydrometer and ICP-MS methods, respectively. All the dataobtained in this study were compiled in a Geographic Information System (GIS) database for preparationof various thematic map layers. Furthermore, scatter plots were also used to explore the relationshipbetween the elements such as Ni, Cr, Co, and Fe. The results obtained from thematic map layers and scatterplots suggest that deltaic sediments in the study area originated from two different sources that differin mineralogical and geochemical characters. According to mineralogical and geochemical differencesin these sources, Quaternary sediments in the study area can be divided in  two separate parts, suchas western and eastern soils. This differentiation is caused by the geological materials brought fromdifferent sources by the Deliçay and Tarsus rivers, which also played important roles in the formation ofQuaternary sediments. Quaternary sediments in the study area display differences in textural properties inthe north-south direction, whereas showing differences only in geochemical and mineralogical propertiesin the west-east direction.