There are many pluton or stock size granitoid bodies (i.e. Nevruz–Çakıroba, Sofular, Soğucak, Yapaztepe) in northern Yenice area (Çanakkale). Extended contact metamorphic aureole and skarn zones were developed along the perimeter of these granitoids. Although the Karadoru Granitoid itself is exposed over a restricted area, a well developed contact metamorphic and skarn zone is formed in an area of approximately 7 km2. During the Late Oligocene, the Karadoru Granitoid intruded into the Nilüfer and Hodul units of the Karakaya Complex (Triassic age), and caused intense contact metamorphism in these units. The observed mineral paragenesis shows that the progressive path from albite-epidote hornfels to hornblend hornfels facies metamorphism was established. Garnet-epidote skarn, quartz-epidote skarn and diopside-garnet skarn zones formed along the contact of the granite and marble in northern and central parts of the Karadoru village. Garnets have generally andradite-rich composition in the skarn zones. As iron was almost fixed by garnets, no significant iron mineralization was formed in skarn zones except small iron minerals. Microthermometric data obtained from epidote skarn zone show that the skarn formation started at 485oC (between 465 and 508) and continued till 311 oC. The eutectic temperatures (Te: -83 oC and -63oC) indicate high concentration of the Li, K and Mg in the composition of the solution. It is determined that the solutions at the high temperature (average 485 oC) have 0, 6 – 0, 7 gr/ cm3 density and 16 – 16,8 % NaCl equivalent salinity. After the temperature decreased (average 366 oC), the salinity of the solution diminished, probably because of adding of the meteoric water to the system. But, while temperature decreased to 311 oC averages, the salinity of the solution (17,5-18 % NaCl equivalent) increased in late stage of the skarn formation. This is interpreted as increase of the salinity via addition of cations (such as Na, Mg, K and Ca) by the fluid-wall rock interaction to the diluted solution after meteoric water added to the solution system.