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Palaeoclimate in NW Bulgaria Since the Last Interglacial Period Revealed by Magnetic Studies
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 6th Congress of the Balkan Geophysical Society, Oct 2011, cp-262-00131
Abstract
Magnetic signals of loess-palaeosol sequences around the world are carrying important information about the behaviour of earth’s magnetic field during the Pleistocene, as well as are recognized as valuable records of past climate change on the continents. The study area is located west of the town of Vidin Two outcrops near the villages of Koshava and Gomotartzi have been studied. Both sections are situated on the first river terrace of the Danube. Initial cleaning of the outcropping walls of the loess sections was performed in order to remove the uppermost weathered material. Both profiles were divided in nonoverlaping sections and both profiles are with lenght of about 6 meters. In the laboratory, all the samples were air dried and then crushed by hand in order to obtain fine, homogenous material. Mass-specific magnetic susceptibility was determined also frequency dependent magnetic susceptibility was measured furthermore stepwise magnetic separation of the initial material was performed. The two loess-palaeosol sections from most NW part of Bulgaria – Gomotartzi and Koshava, show detailed records of magnetic susceptibility variations, which reflect changing (palaeo) climate conditions in the study area during the last ~100 000 years.