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Mossbauer parameters of iron in phosphate minerals; implications for interpretation of Martian data

M. Darby Dyar, Erica R. Jawin, Elly Breves, Gerard Marchand, Melissa Nelms, Melissa D. Lane, Stanley A. Mertzman, David L. Bish and Janice L. Bishop
Mossbauer parameters of iron in phosphate minerals; implications for interpretation of Martian data
American Mineralogist (May 2014) 99 (5-6): 914-942


Phosphate minerals, while relatively rare, show a broad range of crystal structure types with linkages among PO (sub 4) tetrahedra mimicking the hierarchy of polymerization of SiO (sub 4) tetrahedra seen in silicate minerals. To augment previous Mossbauer studies of individual phosphate species and groups of species, this paper presents new Mossbauer data on 63 different phosphate samples, and integrates them with data on more than 37 phosphate species in 62 other studies from the literature. Variations in Mossbauer parameters of different sites in each mineral are then related to both the local polyhedral environment around the Fe cations and the overall structural characteristics of each species. The entire aggregated Mossbauer data set on phosphate minerals is juxtaposed against parameters obtained for spectra from the MIMOS spectrometers on Mars. This comparison demonstrates that signatures from many different phosphate or sulfate mineral species could also be contributing to Mars Mossbauer spectra. Results underscore the conclusion that unique mineral identifications are generally not possible from Mossbauer data alone, particularly for paramagnetic phases, although combining Mossbauer results with other data sets enables a greater level of confidence in constraining mineralogy. This study provides a wealth of new data on Fe-bearing phosphate minerals to bolster future analyses of Mossbauer spectra acquired on Mars.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 5-6
Title: Mossbauer parameters of iron in phosphate minerals; implications for interpretation of Martian data
Affiliation: Mount Holyoke College, Department of Astronomy, South Hadley, MA, United States
Pages: 914-942
Published: 201405
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 261
Accession Number: 2014-048816
Categories: Mineralogy of non-silicatesExtraterrestrial geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Planetary Science Institute Tucson, USA, United StatesFranklin and Marshall College, USA, United StatesIndiana University, USA, United StatesSETI Institute, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201427
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