Abstract
A set of pure iron-rich minerals characteristic of common fine-grained sedimentary rocks has been prepared and their Mossbauer spectra obtained. These include pyrite, carbonates and silicates. Six marine mudrocks were then chosen from a large set for which complete chemical data were available. It proved possible to reproduce mudrock spectra by addition of the pure mineral spectra in proportions indicated by the chemical analyses. Unfortunately, however, overlap of Fe(III) in dioctahedral silicates with Fe(II) in pyrite prevents reliable deconvolution of mudrock spectra to obtain quantitative estimates of component concentrations. Useful information about Fe(II) in other minerals can still be obtained. Mossbauer spectroscopy would appear to have great promise for the study of early reactions in non-marine sediments which are usually low in sulphur. Mineral products are either X-ray amorphous or extremely fine-grained mixtures and very difficult to study by other means.
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