QUANTITATIVE MINERALOGY OF FINE-GRAINED SEDIMENTARY ROCKS: AN EXAMPLE FROM THE MANCOS SHALE AND A PRELIMINARY LOOK AT QEMSCAN~R

摘要

Quantitative mineralogical data are required for a variety of purposes including rock classification, understanding rock genesis, and geochemical modeling. Obtaining those data and verifying their accuracy is difficult, especially for fine-grained rocks. We report on a comparison between two methods for the determination of quantitative mineralogy and compare their results to traditional chemical tests used to quantify mineralogy: a grain by grain elemental analysis based on the use of an automated scanning electron microscope (QEMSCAN?) and a spectral method utilizing X-ray diffraction (RockJock).