Abstract: The study area, located in the Cappadocia Volcanic Terrain between the dextral Tuz Gölü fault and sinistralEcemiş fault, was affected by neotectonic forces and accordingly underwent volcanic activity that developed fromlate Miocene until recent years. Extrusive igneous rocks outcropping in central Anatolia around Susuzdağ (Hamurcutown, Kayseri) and Tekkedağ (Başdere town, Niğde) were mapped using an Advanced Spaceborne Thermal Emissionand Reflection Radiometer (ASTER) multispectral satellite image. Band ratio images of 9/8, (1+4)/(2+3), 6 and(1+4)/(2+3), 8, 4/6 (RGB) were constructed by taking in account ASTER bands corresponding to the characteristicFe, Al-OH and Fe/Mg-OH absorption features of rocks in the region, and the boundaries of basalt, basaltic andesite/andesite, dacite and pyroclastic rocks in the region were delineated. It was demonstrated that a band ratio of 9/8 isparticularly effective in differentiating basalt and andesite from the surrounding extrusive igneous rocks. In addition,the ferrous iron index, (1+4)/(2+3), clearly indicates dacite domes as bright pixels around Hamurcu town. Incesuignimbrite covering large areas in the region appears in darker tones than the surrounding rocks in the 4/6 bandratio image due to the fact that it has a relatively shallow absorption feature in ASTER band6. The accuracy of the resultant lithological maps generated from the first-time used band ratio images was verified by comparing the fieldsurvey and geological maps. Although there is some uncertainty in discriminating between basalt and andesite, theresultant ASTER images enable us to map extrusive igneous rocks in a cost-effective, reliable and fast manner. Themethodology used in this study can be applied for mapping igneous rocks in similar geographic locations in Turkeyand around the world.