Quantitative Mineral Analysis of Clay-Bearing Sedimentary Rocks

Quantitative mineral analysis of clay-bearing sedimentary rocks integrates a suite of analytical methods to accurately determine the proportions and distributions of mineral phases in fine-grained deposits. Clay minerals, characterised by low crystallinity and structural disorder, complicate conventional X-ray diffraction quantification, prompting refinement of established approaches such as the reference intensity ratio (RIR), Rietveld refinement and full-pattern summation (FPS) methods. Advances in high-throughput diffraction, image-based mineralogy and data pre-treatment have enhanced precision and throughput. These developments are crucial for applications in hydrocarbon reservoir characterisation, soil science, carbon capture studies and palaeoenvironmental reconstruction. By combining improved diffraction protocols, multivariate statistics and microscopy-based segmentation, researchers now achieve more reliable insights into the mineralogical complexity of sedimentary systems worldwide.

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Quantitative Mineral Analysis of Clay-Bearing Sedimentary Rocks publication trend

The graph below shows the total number of articles in quantitative mineral analysis of clay-bearing sedimentary rocks across all publications each year (not limited to Nature Index journals).

Technical terms

X-ray diffraction (XRD): Analytical technique that identifies and quantifies crystalline minerals by measuring diffraction patterns produced by their crystal lattices.

Reference intensity ratio (RIR) method: Quantitative XRD approach that uses the ratio of peak intensities of unknown phases to a standard reference phase.

Rietveld refinement: Full-pattern fitting method that adjusts a structural model to match the entire diffraction profile, yielding phase quantities and lattice parameters.

Full-pattern summation (FPS) method: Quantification technique that sums the contributions of individual phase profiles across the full diffraction pattern for phase abundance estimation.

QEMSCAN: Automated mineralogy system combining quantitative evaluation by scanning electron microscopy with energy-dispersive X-ray spectroscopy for phase mapping.

MAPS (Mineral and Particle Segmentation): High-resolution backscatter imaging technique that segments and quantifies mineral phases at submicrometre scale.

Clay minerals: Fine-grained, hydrous phyllosilicate minerals (e.g., kaolinite, smectite) common in sedimentary rocks, influencing physical and chemical behaviour.

References

1. Comparison of Quantitative X-ray Diffraction Mineral Analysis Methods. Minerals (2023).
2. Pre-treatment of soil X-ray powder diffraction data for cluster analysis. Geoderma (2019).
3. High-throughput powder diffraction. III. The application of full-profile pattern matching and multivariate statistical analysis to round-robin-type data sets. Journal of Applied Crystallography (2004).
4. Shale Mineralogy Analysis Method: Quantitative Correction of Minerals Using QEMSCAN Based on MAPS Technology. Applied Sciences (2022).