Sourcing limestone masonry for restoration of historic buildings: a spectroscopic study

Firth, C., Hopkinson, L., Rutt, K., Kristova, P. and Blows, J. (2015) Sourcing limestone masonry for restoration of historic buildings: a spectroscopic study. Journal of Cultural Heritage, 16 (6). pp. 822-830. ISSN 1296-2074.

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Abstract

This study presents a combined Fourier transform (FT) mid-infrared, laser Raman and Commission internationale d’éclairage (CIE) L*a*b*system analysis of quarry-derived impure limestone and fallen masonry from a medieval listed building situated in the south east of England, to ascertain how spectroscopic information can be collectively employed to identify the most exacting possible replacement stone source.Data shows that subtle differences in [Al] and [Fe3+] octahedral and tetrahedral site occupancy in glauconite group clays registered in the mid-infrared [3530 cm−1/3620 cm−1] absorption ratio exerts some influence on L*Cab*hab*values. Increases in L*and Cabare associated with decreasing clay content. Theoverall weakness of correlations between infrared and visible range spectral attributes indicates multiple contributing sources to overall color. Evidence indicates that the degree of laser Raman induced background noise is related to the overall calcite content and that activators of fluorescence at 785 nmexcitation wave length may also contribute to rock color. The results are utilized to define closest matching quarry samples to the fallen masonry.

Item Type: Article
Uncontrolled Keywords: Mid-infrared Raman; CIE L*a*b*; limestone; masonry; provenance; environmental resource management
Subjects: C Auxiliary Sciences of History > CC Archaeology
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Social and Applied Sciences
Depositing User: Callum Firth
Date Deposited: 30 Oct 2015 10:55
Last Modified: 21 Sep 2016 15:19
URI: https://create.canterbury.ac.uk/id/eprint/13910

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Last edited: 29/06/2016 12:23:00