In: Wagner W., Székely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Voi. XXXVIII, Part 7B 
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samples concerning to TIR image results are mostly 
serpentinized but still contain olivine, less orthopyroxene and/or 
clinopyroxene as relicts determined by the petrographical 
studies. Additionally, target unit’s boundaries were distinctly 
mapped among ophiolitic mélange within the area. 
Figure 6. The results of (A) 2/3 and (B) 6/8 band ratio 
algorithms generated from ASTER SWIR bands. 
The both results of TIR band algorithms are similar to each 
other in terms of lithological boundaries. On the other hand, the 
topographical effects are mostly observed as removed in the 
results obtained with the formula (12*14) / (13 2 ), given in figure 
7A. Besides, the effect of vegetation on both results is 
interestingly noticeable. It can be possible to detect olivine rich 
ultramafic units as well in the central parts of the Eldivan 
ophiolitic melange, at SE of Eldivan Mountain, in the locations 
of sparse vegetation areas of the pinery. (Figure 3, 7A). 
While correlating the simplified geological map of the region 
with the analyses results, it can be easily recognized that the 
olivine-peridotite portions of ultramafic units are displayed as 
bright pixels either inside or outside the boundaries of ophiolitic 
melange. Ground truth surveys show that those out-boundary 
results are also matched with the peridotite units. It is concluded 
that to improve the geological map details while working with 
ultramafic lithologies, the band algorithms concerning to the 
olivine-peridotite (figure 7A, 7B) can be helpful. 
Figure 7. The olivine-peridotite (dunite) band algorithms 
developed using spectral characteristics of ultramafic 
rocks. Band algorithm results: (A) (12*14) / (13 2 ) 
and (B) (14/13)/(13/12) 3 . 
In case of mapping the lithologies related to ultramafic units, the 
spatial resolution sometimes limits the detail of studies. The 
band ratio 6/8 could be used in matched areas to correlate 
boundaries of ultramafic units. 
3. SUMMARY AND CONCLUSION 
The olivine-rich ultramafic unit, especially olivine-peridotite or 
dunite and those boundaries was clearly discriminated and 
mapped within the ophiolitic lithologies. 
Among the band ratios introduced by using spectral 
characteristics of the mafic minerals, olivine, pyroxene, 
serpentine group, the ratio 6/8 can be used in such cases.