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 Cited Article:    HUNT CP. EFFECT OF CITRATE BICARBONATE DITHIONITE TREATMENT ON FINE-GRAINED MAGNETITE AND MAGHEMITE
 Alert Expires:    14 JUL 2007
 Number of Citing Articles:    1 new records this week (1 in this e-mail)
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Title:
How abundant is pedogenic magnetite? Abundance and grain size estimates for loessic soils based on rock magnetic analyses

Authors:
Geiss, CE; Zanner, CW

Author Full Names:
Geiss, Christoph E.; Zanner, C. William

Source:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 111 (B12): Art. No. B12S21 DEC 7 2006

Language:
English

Document Type:
Article

Keywords Plus:
ISOTHERMAL REMANENT MAGNETIZATION; BICARBONATE-DITHIONITE TREATMENT; LOG GAUSSIAN FUNCTIONS; M-RS/M-S; CHINESE LOESS; ACQUISITION CURVES; PALEOCLIMATIC IMPLICATIONS; MINERAL FORMATION; GREAT-PLAINS; SUSCEPTIBILITY

Abstract:
[1] The upper soil horizons of many modern and ancient soils are enriched in fine-grained pedogenic ferrimagnetic minerals. We use three grain-size- and concentration-dependent proxies (anhysteretic remanent magnetization/isothermal remanent magnetization ratios, coercivity spectra derived from alternating field demagnetization of saturation isothermal remanent magnetization and hysteresis properties) to quantify the abundance and grain size of the pedogenic magnetic component. Our analyses of modern loessic soils from the midwestern United States show that relatively small additions ( 2 - 10 vol % of the total ferrimagnetic component) of fine-grained ( coarse superparamagnetic to fine pseudosingle domain) magnetite or maghemite are sufficient to explain the changes in concentration and grain-size-dependent properties observed in the upper soil horizons. Furthermore, the pedogenic components of all studied sites display a narrow range of magnetic properties, which argues for!
  a common origin of these particles over a wide range of climatic conditions.

Reprint Address:
Geiss, CE, Trinity Coll, Dept Phys, 105 McCook Hall,300 Summit St, Hartford, CT 06106 USA.

Research Institution addresses:
Trinity Coll, Dept Phys, Hartford, CT 06106 USA; Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA

E-mail Address:
christoph.geiss@trincoll.edu; bzanner@umn.edu

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Cited Reference Count:
68

Times Cited:
0

Publisher:
AMER GEOPHYSICAL UNION; 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA

Subject Category:
Geochemistry & Geophysics

ISSN:
0148-0227

IDS Number:
115TS