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Titolo:
MAGNETIC-SUSCEPTIBILITY OF SOIL - AN EVALUATION OF CONFLICTING THEORIES USING A NATIONAL DATA SET
Autore:
DEARING JA; HAY KL; BABAN SMJ; HUDDLESTON AS; WELLINGTON EMH; LOVELAND PJ;
Indirizzi:
UNIV LIVERPOOL,DEPT GEOG LIVERPOOL L69 3BX MERSEYSIDE ENGLAND COVENTRY POLYTECH,SCH NAT & ENVIRONM SCI COVENTRY CV1 5FB W MIDLANDS ENGLAND UNIV WARWICK,SCH BIOL SCI COVENTRY CV4 7AL W MIDLANDS ENGLAND CRANFIELD UNIV,SILSOE COLL,SOIL SURVEY & LAND RES CTR SILSOE MK45 4DTBEDS ENGLAND
Titolo Testata:
Geophysical journal international
fascicolo: 3, volume: 127, anno: 1996,
pagine: 728 - 734
SICI:
0956-540X(1996)127:3<728:MOS-AE>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHINESE LOESS; PALEOSOL SEQUENCES; GRAINED MAGNETITE; SINGLE-DOMAIN; DEPENDENCE; MAGHEMITE; PLATEAU;
Keywords:
CLIMATE; MAGNETIC SUSCEPTIBILITY; SOILS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Dearing et al., "MAGNETIC-SUSCEPTIBILITY OF SOIL - AN EVALUATION OF CONFLICTING THEORIES USING A NATIONAL DATA SET", Geophysical journal international, 127(3), 1996, pp. 728-734

Abstract

Magnetic susceptibility values for topsoils across England are combined with data for soil type, geochemistry and concentrations of magnetotactic bacteria in order to evaluate different theories for explainingsoil magnetism. Strongly magnetic soils in unpolluted areas are foundover weakly magnetic substrates and are dominated by ultrafine superparamagnetic grains. Magnetotactic bacteria are present in insufficientconcentrations to account for strongly magnetic soils, and crop burning is discounted as a major factor. A small number of samples show high values associated with either airborne magnetic particulates from pollution or residual primary ferrimagnetic minerals from igneous substrates, The results are used to construct a new mechanism for the formation of secondary ferrimagnetic minerals that links abiological weathering and biological fermentation processes, The fundamental driving force in the mechanism is Fe supply, which may be linked to climate. Observed causative associations between climate and the magnetic susceptibility of loess-palaeosol sequences are supported by the findings.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 04:58:59