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d’archéologie orientale - Le Caire

Verre byzantin et islamiqueByzantine and Islamic Glass

Maria Mossakowska-Gaubert

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LESLIE, Karen A. ; FREESTONE, Ian C. ; LOWRY, David ; THIRLWALL, Matthew
The Provenance and Technology of Near Eastern Glass: Oxygen Isotopes by Laser Fluorination as a Complement to Strontium
Archaeometry 48/2
University of Oxford, 2006, p. 253-270

[301, 1300]
• Preliminary remarks:
– isotopes of strontium (87Sr/86Sr) - derived from the lime component of glass,
– oxygen isotope (δ18O) - derived primarily from silica source.

• Materials analysed:
– all glasses analysed are soda-lime-silica composition.

– low-magnesia or natron-based glasses (4th-9th centuries A.D.):
- Bet Eliʿezer (6th-8th centuries): primary workshop,
- Bet Shean (6th-7th centuries): secondary workshop,
- Tel el-Ashmunein (8th-9th centuries): secondary workshop,
- Carthage (4th-6th centuries): secondary workshop debris ?

– high-magnesia or plant-ash-based glasses (9th-13th centuries A.D.):
- Tyre (10th-12th centuries): primary workshop,
- Banias (10th/11th-13th centuries): secondary workshop,
- Raʾs al-Hadd (10th-13th centuries): consumer site, surface finds.

• Isotopic composition and the origins of the glasses:
– strontium isotopes reflect the geo-environment of lime source:
- natron glasses: Holocene shell or inland limestone (from the sand);
- plant-ash glasses: limestone (from soils parental to the plants that were ashed to make the glass).
– oxygen isotopes:
- less effective at discriminating sites than strontium isotopes,
- oxygen isotope measurements as an extremely effective and economic way of confirming the presence of special raw material (as chert) in glass.

• Choice of analysis methods: isotopic analysis or trace element analysis, as a primary method for the investigation of glass distribution - preliminary observations:
– isotopic data more clearly indicates regional geochemical signatures, and the use of unusual raw materials,
– elemental analysis is likely to offer the way forward when discriminating between the products of workshops located in the same region and using separate, but geologically related, materials.

Version 5, données dudata date 30 janvier 2013January 30th 2013