Mineral mapping in Oymaağaç (Beypazarı)-Ankara) Granitoid by remote sensing techniques

Pekesin, Burcu Fatma
The aim of this study is to extract information about mineral distribution and percentages of Oymaagaç granitoid (Beypazari-Ankara) by using remote sensing techniques. Two methods are applied during the studies which are spectral analysis and Crosta techniques. Spectral measurements are done for fresh and weathered samples collected at 32 locations. Mineral percentages are calculated using spectral mixture analysis for each sample by considering main, accessory and secondary mineral content of granodiorite. A total of 10 endmembers for fresh samples and 15 for weathered samples are used. USGS spectral library data is utilized through the analyses. For Crosta technique (image analysis) the multispectral ASTER satellite image is used. Five alteration minerals are discriminated and their maps are generated during this analysis. Interpretation and comparison of the results of both methods and testing these results with the existing petrographical and geochemical data indicate that: 1) according to the results of both spectral analyses and Crosta technique a zonation is not observed in the granitoid, 2) comparison of the results for alteration minerals of these two analyses are partly compatible but not exactly similar, 3) Results of spectral analysis do not fit geochemical nor modal analyses because of inconsistency of the data sets.


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Citation Formats
B. F. Pekesin, “Mineral mapping in Oymaağaç (Beypazarı)-Ankara) Granitoid by remote sensing techniques,” M.S. - Master of Science, Middle East Technical University, 2005.