Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..127b&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 1, pages 127-129.
Physics
13
Scientific paper
Samples of Holbrook (an L6 chondrite which fell in Arizona in 1912) were analysed by 57Fe Moessbauer spectroscopy to determine the proportion of the total iron that had been converted to Fe3+ by weathering processes. Although samples recovered in 1912 showed negligible (<1%) alteration, a spectrum recorded from a specimen recovered in 1968 showed 9.7% of the total iron was present as Fe3+. Given the existence of samples in similar semi-arid environments with terrestrial ages >40 ka, a linear rate of weathering is unrealistic, rapidly producing very high levels of oxidation in samples with low terrestrial ages. However, if weathering follows an approximate power law then we can model a rapid initial phase, and the levels of oxidation more typical in samples with much longer terrestrial residence times recovered from Roosevelt County. Our analysis, together with work on terrestrial age dated samples, indicates that hot desert weathering of ordinary chondrites is at least a two stage process, with an initial rapid phase lasting <500 years before oxidation is passivated.
Berry Frank J.
Bland Philip A.
Pillinger Colin T.
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