Visualising mineralogical heterogeneities and texture in a mudstone concretion using hyperspectral imaging
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Author:
Manss Y,
Hilgers C,
Buddenbaum H,
Stanjek H
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Source:
Zeitschrift der Deutschen Gesellschaft für Geowissenschaften, 168:403-412, doi
- Date: Nov. 2017
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It is often difficult to identify and quantify mineralogical heterogeneities on the centimetre to metre scale by optical means, when these heterogeneities have apparently similar colours. Therefore, a general image processing workflow combined with mineralogical analytical methods is presented by using contact-free hyperspectral imaging techniques on a mudstone concretion. The application of spectral algorithms reveals a distinct texture in a visually homogeneous black rock. The pattern is confirmed by optical and electron microscopy as well as X-ray diffraction, showing a layered texture of varying amounts of siderite and clay minerals. The rapid and contact-free visualisation of rock anisotropies such as mineralogical heterogeneities in overall homogeneous rocks may thus enable a better prediction of mechanical and petrophysical heterogeneities on mm- to 100 m scale.