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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Mineral Compositions Calculated from Chemical Analyses of Sedimentary Rocks
John Imbrie, Arie Poldervaart
ABSTRACT
A method is described for routine calculation of mineralogical compositions from chemical analyses of sedimentary rocks. Although designed for the particular mineral suites found in the Florena Shale (a mid-continent Permian argillaceous unit containing calcite, dolomite, chert, and clay as major constituents), it can be adapted with slight modification for use with a wide variety of sedimentary rock types. After restating the bulk analysis in terms of molecular ratios, TiO2, Na2O, P2O5, SO3, and S are disposed of as rutile, albite, apatite, gypsum, and pyrite. Next, all of the CaO and CO2 and as much MgO as is required, are used to form calcite and dolomite. The balance of the MgO and all of the K2O are then used to form illite and either sericite or chlorite, depending on the relative amounts of MgO and K2O. Residual Fe2O3 and Al2O3 are computed as montmorillonite and residual SiO2 is regarded as chert. Results of computation compare well with X-ray and insoluble residue data and the method is judged to provide an estimate of the proportions of clay, dolomite, calcite, and chert accurate to within 5 per cent.
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