INVESTIGATIONS OF THE ANCIENT CERAMIC SHERDS EXCAVATED FROM BORUKCU SITE IN MUGLA, SOUTH-WESTERN TURKEY, BY ATR-FTIR SPECTROSCOPY AND STATISTICAL MULTIVARIATE ANALYSIS

摘要

This paper presents the mineralogical characterization of 56 sherd samples from the Borukcu site in Mugla, Turkey. Principal component analysis (PCA) employing raw attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectra (825-400 cm(-1)) with 17 smoothing points discriminated the sherd samples into five different groups (A-E). The second-derivative ATR-FTIR spectra (two polynomial degrees and 11 smoothing points) between 1700 and 400 cm(-1) were successfully used to assess the firing conditions. The obtained results showed that the firing temperatures are about 600-800 degrees C for sherd groups A, C and D and about 800-950 degrees C for sherd groups E and B.