Record details

Title
    Loess-palaeosol stratigraphy in the Yenisey basin, Southern Siberia
Statement of responsibility
    Jiří Chlachula
Author
    Chlachula, Jiří
Language
    anglicky
Source title - serial
    Sborník geologických věd. Antropozoikum
Vol./nr.
    Roč. 23
Pages
    s. 55-70
Year
    1999
Notes
    12 obr., 6 fot., 1 pl.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Sbor. geol. Věd, Antropozoikum.
Subject group
    asociace minerální
    geologie regionální
    holocén
    magnetostratigrafie
    paleoklima
    pleistocén-svrchní
    půda fosilní
    spraš
Geographical name
    Jenisejská pánev (Rusko-Sibiř západní)
    Rusko-Sibiř západní
Keyword
    Basin
    Loess-palaeosol
    Siberia
    Southern
    Stratigraphy
    Yenisey
Abstract (in english)
   A high-resolution Late Quaternary Siberian palaeoclimatic record has been derived from the Kurtak Section 29 in the Northern Minusinsk Basin of the Southern Krasnoyarsk region. The 34 m-thick loess palaeosol sequence provides evidence for strongly fluctiating apaleoclimates in northern continental Euroasia during the Late Quaternary with maximum amplitudes of climatic change between 130 and 10 ka BP. A succession of buried chernozemic, brunisolic and gleyed regosolic soils are consistently demarcated within bulk magnetic susceptibility depth functions, with increased values (= 250-650 x 10-2 S.I.) reflecting cold intervals and lower values (= 20-250 x 10-2 S.I.) indicative of warm and climatically moderate intervals.
   This specific magnetic susceptibility pattern (with the minima in the most weathered interglacial soils) is completely opposite to the Chinese loess susceptibility record, where the magnetic concentration level in paleosols directly correlates with the degree of pedogenesis. A gradual magnetic mineral depletion during soils formation, coupled with a more intense wind activity during cold intervals leading to accumulation of greater quantities of larger ferrimagnetic grains, is assumed to account for the higher magnetic susceptibility capacity in loess. The magnetic susceptibility curve shows a globally diagnostic trend for the last two glacial-interglacial stages as recognised in deep-sea oxygen isotope records
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    6. 3. 2009
Import date
    8. 8. 2012