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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:57 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Rock magnetic records of climatic oscillations in a southern romanian loess
Authors:
C. NECULA, C. PANAIOTU
Affiliation:
University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Bucharest, Romania
E-mail
c3necula@yahoo.com; cristian.panaiotu@gmail.com
Keywords:
loess-paleosol, rock-magnetic parameters, mineral magnetism, FORC
Abstract:
Thermomagnetic curves, hysteresis parameters, isothermal and viscous remanence and FORC diagrams were performed for several representative loess and paleosol samples form Mircea Voda profile (Dobrogea, Romania). All these showed a uniform magnetic mineralogy along the whole loess profiles dominated by magnetite. Histerezis properties and FORC distribution revealed a complex distribution of grain size magnetite. Using FORC diagrams, the contribution of different magnetic components in loess and palesol samples was established for the first time. Thus FORC distribution showed different magnetic signature for loess and paleosols. Paleosols are dominated by supermaramagnetic and non-interacting particles with less contribution from MD and/or PSD whereas loess samples are dominated by larger particles but also with important contribution from non-interacting SD and SP magnetic grains. These results are consistent with those obtained from loess deposits located in China, Central Asia and Europe proving that pedogenesis is favourable to the formation of new, ultrafine magnetic minerals.
Note: Necula Cristian was supported by the strategic grant POSDRU/89/1.5/S/58852, Project “Postdoctoral programme for training scientific researchers” cofinanced by the European Social Fund within the Sectorial Operational Program Human Resources Development 2007-2013.
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