Reconstruction of superparamagnetic particle grain size distribution from Romanian loess using frequency dependent magnetic susceptibility and temperature dependent Mössbauer spectroscopy
作者： Cristian Necula , Cristian Panaiotu , Gabriel Schinteie , Petru Palade , Victor Kuncser
DOI: 10.1016/J.GLOPLACHA.2015.05.009
关键词:
摘要: Abstract Previous studies have shown that the magnetic parameters of Romanian loess/paleosol sequences recorded Quaternary glacial/interglacial cycles over last 600 kyr. rock investigations pointed out enhancement in loess is mainly due to pedogenic magnetite close superparamagnetic/stable single domain boundary. We report first reconstruction grain size distribution (GSD) superparamagnetic (SP) particles for two deposits, Costinesti and Mircea Vodă, located Dobrogea Plateau between Danube River Black Sea. The GSDs were obtained using both wide-band frequency spectrum susceptibility (FSMS) method low temperature Mossbauer spectroscopy. FSMS shows SP are present paleosols. shifted slightly higher diameters with respect concentration has an opposite trend. largest value reached forest paleosol lowest samples. Both paleosols indicated almost same dominant (about 17 nm 18 nm samples). However GSD shapes different than those found In paleosols, shape seems be independent climate degree pedogenesis. These factors control only each paleosol. Temperature dependent spectroscopy also supports presence a mean diameter around 13–14 nm. Dispersion case varies from sample being probably affected by random surface defects.
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sci-hub.se 参考文章(85)
Marius-Victor Birsan, Alexandru Dumitrescu, ROCADA: Romanian daily gridded climatic dataset (1961-2013) V1.0 Administratia Nationala de Meteorologie, Bucuresti, Romania. ,(2014) , 10.1594/PANGAEA.833627
The Earth's Magnetic Interior emi. ,(2011) , 10.1007/978-94-007-0323-0
Adry J. van Velzen, Low-Temperature Oxidation of Magnetite in Loess-Paleosol Sequences: a Correction of Rock Magnetic Parameters Studia Geophysica Et Geodaetica. ,vol. 43, pp. 357- 375 ,(1999) , 10.1023/A:1023278901491
Lucica Miu, Victor Kuncser, Size effects in nanostructures : basics and applications Springer. ,(2014)
Kenneth J Klabunde, Ryan M Richards, Nanoscale materials in chemistry Nanoscale Materials in Chemistry. pp. 304- ,(2001) , 10.1002/0471220620
Quaternary Climates, Environments and Magnetism Quaternary Climates. pp. 402- ,(1999) , 10.1017/CBO9780511535635
Z. L. Ding, E. Derbyshire, S. L. Yang, Z. W. Yu, S. F. Xiong, T. S. Liu, Stacked 2.6-Ma grain size record from the Chinese loess based on five sections and correlation with the deep-sea δ18O record Paleoceanography. ,vol. 17, pp. 5- 1 ,(2002) , 10.1029/2001PA000725
Peter Droogers, Richard G. Allen, Estimating Reference Evapotranspiration Under Inaccurate Data Conditions Irrigation and Drainage Systems. ,vol. 16, pp. 33- 45 ,(2002) , 10.1023/A:1015508322413
Kazuto Kodama, Application of broadband alternating current magnetic susceptibility to the characterization of magnetic nanoparticles in natural materials Journal of Geophysical Research. ,vol. 118, pp. 1- 12 ,(2013) , 10.1029/2012JB009502
Philipp Gütlich, Eckhard Bill, Alfred X. Trautwein, Basic Physical Concepts Mössbauer Spectroscopy and Transition Metal Chemistry. pp. 7- 24 ,(2011) , 10.1007/978-3-540-88428-6_2