Comparison of Laboratory Diffraction Contrast Tomography and Electron Backscatter Diffraction Results: Application to...

Area of Science:

• Mineralogy and Petrology
• Geological Engineering
• Materials Science

Background:

• Understanding mineral distribution and texture is crucial for material formation and mining engineering.
• Laboratory diffraction contrast tomography (LabDCT) is a novel, nondestructive technique for 3D crystallographic orientation mapping.
• Previous methods often lack true 3D textural and grain information.

Purpose of the Study:

• To demonstrate the application and evaluate the effectiveness of LabDCT on natural geological samples.
• To compare LabDCT results with established techniques like Electron Backscatter Diffraction (EBSD).
• To assess the quality and potential inaccuracies of LabDCT for mineralogical analysis.

Main Methods:

• Application of LabDCT on chromite sand and a chromitite sample from the Merensky Reef.
• Comparative analysis using 2D Electron Backscatter Diffraction (EBSD).
• Rigorous qualitative and quantitative evaluation of obtained results, including 'completeness' metrics.

Main Results:

• LabDCT successfully generated 3D crystallographic orientation data for the studied samples.
• Results from LabDCT are comparable to 2D EBSD but provide true 3D size, shape, and textural information.
• Identified and discussed potential inaccuracies in LabDCT, proposing solutions.

Conclusions:

• LabDCT is a valuable tool for characterizing mineral texture and crystallography in 3D.
• The technique significantly contributes to understanding complex rock materials from an earth science perspective.
• LabDCT enhances insights into geological processes and material behavior relevant to mining engineering.