Journal
MINERALS
Volume 11, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/min11090937
Keywords
textural analysis; automatic grain shape analysis; pattern of particle shape; roundness
Funding
- Pedagogical University of Krakow Project [BN.610334/PBU/2020]
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Grain-shape analysis is essential in geological research for genetic interpretations and sediment conditions. Automatic particle image analysis methods offer mass and objective roundness analysis possibilities. The study establishes criteria for automatic differentiation of grain shapes based on morphometric parameters.
Grain-shape analyses are essential in geological research because they provide the basis for genetic interpretations, including sedimentation conditions. The methods of visual evaluation used so far have been subjective, time-consuming and labour intensive. Automatic particle image analysis, including the methods used by the Morphology G3SE device, open up the possibility of mass and objective roundness analysis of mineral and organic particles. The article presents the results of measurements for the grain scale proposed by Krumbein in 1941, as this scale has been used in numerous sedimentological studies. The standard shapes were analysed using four parameters: High Sensitivity (HS) Circularity, Convexity, Solidity and Aspect Ratio. In the discussion, both the results and the grain-shape standards were critically assessed. The most important trends in the distribution of morphometric parameters of the scale are shown. On this basis, it was found that it is impossible to determine the parameter boundary values that would distinguish each class of grain roundness proposed by Krumbein. The conclusions propose criteria for the automatic differentiation of angular, subrounded and rounded grains, which could be a basis for describing the shape of mineral particles.
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