Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.132..128c&link_type=abstract
Geophysical Journal International, Volume 132, Issue 1, pp. 128-132.
Astronomy and Astrophysics
Astronomy
22
Loess, Magnetic Susceptibility, Palaeosol, Quaternary, Siberia
Scientific paper
A Late Quaternary loess/palaeosol sequence at Kurtak in the Yenisey River valley, southern Siberia, has been studied magnetically. The 34 m section (340 samples) exhibits variations in magnetic susceptibility which can be correlated with oxygen isotope stages 1-7. A detailed sampling of stage 5 (a further 209 samples) permits the identification of substages 5a-e. The susceptibility variations themselves are in the opposite sense to that found in the classic sections of the Chinese Loess Plateau, but are in agreement with the `wind-intensity' model which has been put forward to explain similar findings in loess sequences in Alaska. Published results for the susceptibility of magnetite imply volume fractions of ~0.2 per cent in glacial stages 2 and 4, dropping to ~0.05 per cent in stages 1, 3 and 5. These fluctuations match the aeolian flux variations observed in core V21-146 from the north Pacific. Even though the warmer intervals are characterized by lower susceptibilities, the observed frequency dependence of susceptibility indicates that new magnetic material is produced as a result of pedogenesis during interglacial and interstadial times.
Chlachula J.
Evans Michael E.
Rutter N. W.
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