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Titolo:
Magnetic, geochemical and DNA properties of highly magnetic soils in England
Autore:
Dearing, JA; Hannam, JA; Anderson, AS; Wellington, EMH;
Indirizzi:
Univ Liverpool, Dept Geog, Environm Magnetism Lab, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX , Merseyside, England Univ Warwick, Sch Biol Sci, Coventry CV4 7AL, W Midlands, England Univ Warwick Coventry W Midlands England CV4 7AL 7AL, W Midlands, England Merck Res Labs, Rahway, NJ 07065 USA Merck Res Labs Rahway NJ USA 07065Merck Res Labs, Rahway, NJ 07065 USA
Titolo Testata:
GEOPHYSICAL JOURNAL INTERNATIONAL
fascicolo: 1, volume: 144, anno: 2001,
pagine: 183 - 196
SICI:
0956-540X(200101)144:1<183:MGADPO>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOESS-PALEOSOL SEQUENCES; SINGLE-DOMAIN; FREQUENCY-DEPENDENCE; FERRIMAGNETIC MINERALS; SUSCEPTIBILITY; SEDIMENTS; POPULATIONS; EXTRACTION; MAGHEMITE; CRYSTALS;
Keywords:
DNA; magnetotactic bacteria; Mossbauer; soil magnetism;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Dearing, JA Univ Liverpool, Dept Geog, Environm Magnetism Lab, POB 147, Liverpool L69 3BX, Merseyside, England Univ Liverpool POB 147 Liverpool Merseyside England L69 3BX nd
Citazione:
J.A. Dearing et al., "Magnetic, geochemical and DNA properties of highly magnetic soils in England", GEOPHYS J I, 144(1), 2001, pp. 183-196

Abstract

A range of mineral magnetic, Mossbauer, geochemical, microscopy and molecular biological techniques are applied to a small set of bulk and fine fractions of highly magnetic English topsoils that overlie weakly magnetic sedimentary geologies. Results show that the ferrimagnetic component of highly enhanced surface soils is dominated by superparamagnetic (SP) grains with a minor proportion of larger stable single-domain/pseudo-single-domain (SSD/PSD) grains that may derive from magnetosomes and magnetic inclusions. DNA screening of the soils by polymerase chain reaction (PCR) shows that the concentration of viable magnetotactic bacteria is too low (normally < 10(2) bacteria g(-1)) to explain the high concentrations of ferrimagnetic minerals observed, There does not appear to be any strong causative relationship between the presence or concentration of Magnetospirillum sp. and soil magnetic properties. Microcosm experiments were able to show that the destructive effects of waterlogging on secondary ferrimagnetic mineral (SFM) formation are rapid and associated with significant changes in bacterial populations. The combined results are used to examine alternative explanations for SFM formation and are consistent with previous findings (Dearing el al. 1996b, 1997) that ferrihydrite may be an important precursor of bacterially mediated magnetite in strongly magnetic temperate soils-a process driven by the rate of Fe flux to the biologically active surface soil.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 05:39:24