A multi-parameter rock magnetic record of the last glacial-interglacial paleoclimate from south-central Illinois, USA

Details A multi-parameter rock magnetic record of the last glacial-interglacial paleoclimate from south-central Illinois, USA A multi-parameter rock magnetic record of the last glacial-interglacial paleoclimate from south-central Illinois, USA

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.152..203g&link_type=abstract

Earth and Planetary Science Letters, vol. 152, Issue 1-4, pp.203-216

Computer Science

12

Paleoclimatology, Sangamonian, Magnetic Susceptibility, Magnetic Hysteresis, Pedogenesis

Scientific paper

Pittsburg Basin, a small kettle lake in south-central Illinois, was formed after the retreat of the Illinoian ice sheet (~130 ka B.P.), and the sedimentary record includes the last interglacial-glacial cycle. Curie temperature measurements, XRD analyses and thermal demagnetization of a low-temperature J rs indicate that the magnetic fraction is characterized by oxidized magnetite and magnetic iron sulfides. The grain size of the magnetic fraction was estimated from ARM/J rs ratios, frequency-dependent susceptibility, and hysteresis parameters. These measurements show that glacial sediments contain coarse-grained, presumably detrital, material while interglacial samples have an additional fine-grained magnetic component, which cannot be explained by a single catchment or climatic process. Early interglacial samples show magnetic properties characteristic of authigenic biogenically produced magnetite, while late interglacial samples are probably influenced by pedogenesis around the basin.

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