Abstract
Fine-scale structures of intact modern and fossil coralline skeletons were analysed to determine alteration to secondary cements and phases using electron backscatter diffraction (EBSD). EBSD analysis revealed secondary aragonite cements in endolithic borings in the modern skeleton and whole dissepiments of the fossil skeleton replaced by calcite, despite X-ray diffraction (XRD) bulk analysis of the general area suggesting only aragonite was present. Non-destructive, in situ screening of coral samples by EBSD analysis provides a valuable tool for assessing the extent of alteration and can determine which areas may produce more reliable climate proxy data.
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Acknowledgements
The authors all gratefully acknowledge financial support from the Leverhulme Trust (F/100179/X) and UK Natural Environment Research Council (NER/T/S2002/00443 and GR3/12021). John Gilleece is thanked for his assistance in sample preparation, Peter Chung for valuable assistance in EBSD and SEM analyses and Robert McDonald for assistance with XRD. This work is in keeping with the aims of Theme 3 of the Scottish Alliance for Geoscience, Environment and Society (SAGES).
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Cusack, M., England, J., Dalbeck, P. et al. Electron backscatter diffraction (EBSD) as a tool for detection of coral diagenesis. Coral Reefs 27, 905–911 (2008). https://doi.org/10.1007/s00338-008-0414-3
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DOI: https://doi.org/10.1007/s00338-008-0414-3