Iron oxides in comet 81P/Wild 2

Bridges, John C. and Burchell, Mark J. and Changela, Hitesh C. and Foster, Nick J. and Creighton, Alan and Carpenter, James D. and Gurman, Stephen J. and Franchi, Ian A. and Busemann, Henner (2010) Iron oxides in comet 81P/Wild 2. Meteoritics & Planetary Science, 45 (1). pp. 55-72. ISSN 1086-9379. (doi:https://doi.org/10.1111/j.1945-5100.2009.01005.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1111/j.1945-5100.2009.01005.x

Abstract

We have used synchrotron Fe-XANES, XRS, microRaman, and SEM-TEM analyses of Stardust track 41 slice and track 121 terminal area slices to identify Fe oxide (magnetite-hematite and amorphous oxide), Fe-Ti oxide, and V-rich chromite (Fe-Cr-V-Ti-Mn oxide) grains ranging in size from 200 nm to ∼10 μm. They co-exist with relict FeNi metal. Both Fe-XANES and microRaman analyses suggest that the FeNi metal and magnetite (Fe2O3FeO) also contain some hematite (Fe2O3). The FeNi has been partially oxidized (probably during capture), but on the basis of our experimental work with a light-gas gun and microRaman analyses, we believe that some of the magnetite-hematite mixtures may have originated on Wild 2. The terminal samples from track 121 also contain traces of sulfide and Mg-rich silicate minerals. Our results show an unequilibrated mixture of reduced and oxidized Fe-bearing minerals in the Wild 2 samples in an analogous way to mineral assemblages seen in carbonaceous chondrites and interplanetary dust particles. The samples contain some evidence for terrestrial contamination, for example, occasional Zn-bearing grains and amorphous Fe oxide in track 121 for which evidence of a cometary origin is lacking.

Item Type: Article
Subjects: Q Science > QB Astronomy
Q Science > QD Chemistry
Q Science > QE Geology > QE515 Geochemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Mark Burchell
Date Deposited: 05 Dec 2013 13:03 UTC
Last Modified: 05 Jan 2015 13:42 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/37223 (The current URI for this page, for reference purposes)
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