Chu, V., Regev, L., Weiner, S. and Boaretto, E. (2008). Differentiating between anthropogenic calcite in plaster, ash and natural calcite using infrared spectroscopy:. J Archaeol Sci 35 (4). Vol 35(4), pp. 905-911.
| Title: | Differentiating between anthropogenic calcite in plaster, ash and natural calcite using infrared spectroscopy: | |||||
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| Subtitle: | implications in archaeology | |||||
| Issue: | J Archaeol Sci 35 (4) | |||||
| Series: | Journal of Archaeological Science | |||||
| Volume: | 35 (4) | |||||
| Page Start/End: | 905 - 911 | |||||
| Biblio Note | Please note that this is a bibliographic record only, as originally entered into the BIAB database. The ADS have no files for download, and unfortunately cannot advise further on where to access hard copy or digital versions. | |||||
| Publication Type: | Journal | |||||
| Abstract: | Infrared spectroscopy provides information not only on the type of calcium carbonate polymorph, but also on the extent of atomic order. In calcite, three major infrared absorption peaks are identified: ν3, νv2, and v4. It was shown that the ratio between v2 and v4 bands reflects the order of the calcite crystal structure. In this paper the authors analyse this ratio in geologically formed calcites, archaeological plasters, modern plasters and experimentally prepared plasters. For the geological calcite, the values of the v2/v4 ratio are around 3, whereas for the experimentally prepared plasters, the values are around 6.5. The v2/v4 ratio for archaeological plasters varies from 3 to 6. This shows that a high ratio is indicative of disorder in the crystal, and implies that the calcite was formed from calcium oxide at high temperatures. It also implies that this disorder can be preserved for at least 14,000 years. The v2/v4 ratio of calcite from archaeological sites can thus be used to differentiate between anthropogenic calcite, such as in plaster, mortar and wood ash, from geogenic calcite, such as in limestone. The ratio may also be used to identify plaster or ash that still retains its original crystals and therefore carbon-14 content. | |||||
| Year of Publication: | 2008 | |||||
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| Source: |
BIAB
(The British & Irish Archaeological Bibliography (BIAB))
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| Created Date: | 23 Jul 2008 |
