Kapadokya Bölgesi İgnimbiritlerinin Muhtemel Kaynak Bölgelerinin Manyetik Hassasiyet Anizotropisi (AMS) Yöntemiyle Tespit Edilmesi

Abstract

Kapadokya ignimbrites are pyroclastic rocks that have settled as a result of volcanism throughout the Neogene and cover large areas in Central Anatolia. Although some studies have been made regarding the source areas of these ignimbrites, the mystery of their source areas remains. To solve this mystery and determine the possible source areas of the ignimbrites, traditional volcanological methods as well as the anisotropy of magnetic susceptibility method (AMS) have been used. The types of components controlling the magnetic susceptibility of the ignimbrites have been determined by EDS studies. It has been determined that the main components controlling magnetization are iron oxide minerals such as magnetite, titanomagnetite, ilmenite, and that biotite and pyroxene minerals are effective in forming the magnetic patterns of the samples. 23274 total magnetic measurements were taken from 1293 directional core samples, AMS parameters were determined, AMS ellipsoids were created, and the magnetic properties of the ignimbrites were revealed. The flow direction of the ignimbrites was determined by using the AMS method, and the path of the pyroclastic flows in valleys was clearly revealed by this method. Along with the flow direction obtained from the AMS method, the dispersal of the ignimbrites, the grain size distribution maps of the pumices and lithics in the fallout products, the thickness of the fallout products, and the orientation of the particles in the flow unit were combined to propose possible source areas for the ignimbrites. The Çardak Caldera was proposed as a possible source area for the Kavak Ignimbrite, the Acıgöl region for the Zelve Ignimbrite, the Çardak Caldera for the Sarımadentepe Ignimbrite, the Güzelyurt Caldera for the Gördeles Ignimbrite, the Orhanlı region for the Kızılkaya Ignimbrite, and the Koçdağ Caldera for the Valibabatepe Ignimbrite.