Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/25052
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Crystallography and diagenesis in fossil craniid brachiopods
Authors: Pérez-Huerta, Alberto
Cusack, Maggie
England, Jennifer
Contact Email: maggie.cusack@stir.ac.uk
Keywords: Biomineral
calcite
c-axis
electron backscattered diffraction (EBSD)
Issue Date: Jul-2007
Citation: Pérez-Huerta A, Cusack M & England J (2007) Crystallography and diagenesis in fossil craniid brachiopods, Palaeontology, 50 (4), pp. 757-763.
Abstract: One of the fundamental questions in biomineralization is how organisms control crystallographic orientation during biomineral production. The understanding of how diagenetic changes influence the preservation of original crystallographic patterns in fossilized biomineral structures provides a priori fundamental information for such an assessment. Fossil craniid brachiopods Petrocrania scabiosa (Late Ordovician) and Crania craniolaris (Late Cretaceous) are analysed using electron backscattered diffraction (EBSD) to provide crystallographic data at high spatial resolution in the structural context. EBSD analyses show that P. scabiosa maintains most of the original crystallographic signature, including data from individual calcite tablets and laminae, while C. craniolaris only retains fragmentary crystallographic data reflecting the crystallographic continuity of tablets across laminae. Data show that the preservation of the original crystallographic signature is independent of that of shell ultrastructure and geological time. In addition, results allow us to propose a series of steps in the evolution of 'crystallographic loss' due to diagenesis.
DOI Link: http://dx.doi.org/10.1111/j.1475-4983.2007.00688.x
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