Paleoclimatic forcing of magnetic susceptibility variations in Alaskan loess during the late Quaternary
- Univ. of Alaska, Fairbanks (USA)
Visual matches and statistical tests suggest correlations between marine isotope curves, retrodictive solar insolation at lat 65{degree}N, and magnetic susceptibility profiles through late Quaternary age Alaskan loess sections. The susceptibility changes largely appear to reflect variability in magnetite content due to climatically controlled changes in wind intensity and competence. Magnetic susceptibility profiles through massive loess can provide stratigraphic context for intercalated paleosols and tephras. A prominent paleosol correlated with marine isotope stage 5 occurs several metres above the Old Crow ash in loess sections, indicating that this important tephra is older than suggested by thermoluminescence dates, and may have been deposited ca. 215 {plus minus}25 ka.
- OSTI ID:
- 6213286
- Journal Information:
- Geology; (USA), Vol. 18:1; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALASKA
PALEOCLIMATOLOGY
LOAM
MAGNETIC SUSCEPTIBILITY
CLIMATES
CORRELATIONS
GEOLOGIC MODELS
GRAIN SIZE
MAGNETIC SURVEYS
MAGNETITE
QUANTITY RATIO
QUATERNARY PERIOD
VARIATIONS
CENOZOIC ERA
CHALCOGENIDES
CRYSTAL STRUCTURE
FEDERAL REGION X
GEOLOGIC AGES
GEOPHYSICAL SURVEYS
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MAGNETIC PROPERTIES
MICROSTRUCTURE
MINERALS
NORTH AMERICA
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALEONTOLOGY
PHYSICAL PROPERTIES
SIZE
SOILS
SURVEYS
TRANSITION ELEMENT COMPOUNDS
USA
580000* - Geosciences