[1] Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, Bern,CH-3012, Switzerland
[2] Department of Geography, Çankiri Karatekin University, Çankiri,TR-18100, Turkey
[3] Faculty of Mines, Istanbul Technical University, Maslak, Istanbul,TR-80626, Turkey
[4] Laboratory of Ion Beam Physics, ETH Zürich, Zürich,CH-8093, Switzerland