HR: 0830h
AN: GP11B-0263 INVITED     [PDF]
TI: Iron at the L-edge: spectromicroscopy of Fe minerals and Fe oxidizing Bacteria
AU: * De Stasio, G P
EM: pupa@src.wisc.edu
AF: UW-Madison, 3731 Schneider Drive, Stoughton, WI 53589 United States
AU: Waychunas, G A
EM: gawaychunas@lbl.gov
AF: Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley,, CA 94720 United States
AU: Chan, C
EM: chan@eps.berkeley.edu
AF: UC-Berkeley, 369 McCone Hall, Berkeley, CA 94720-4767 United States
AU: Banfield, J F
EM: jill@eps.berkeley.edu
AF: UC-Berkeley, 369 McCone Hall, Berkeley, CA 94720-4767 United States
AB: If a natural geologic or biomineralized sample contained an unknown Fe mineral at the sub-micron level, could we unravel its nature with synchrotron spectromicroscopy? To address this question we analyzed 20 compounds and minerals containing Fe(II) and Fe(III) at the Fe L-edge with x-ray absorption near edge structure (XANES) spectroscopy. In addition, we characterized the differences in Fe L-edge spectra between crystalline and amorphous Fe oxides. This enabled the interpretation of data from the natural red biomineral accumulations in a flooded mine in Tennyson, WI.
DE: 0400 Biogeosciences
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting