期刊
JOURNAL OF ARCHAEOLOGICAL SCIENCE
卷 78, 期 -, 页码 57-65出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jas.2016.11.005
关键词
Phytolith dating; Radiocarbon; Occluded carbon; Insoluble fraction
资金
- Kimmel Center for Archaeological Science
- Max Planck-Weizmann Center for Integrative Archaeology and Anthropology
- Exilarch Foundation for the Dangoor-REAMS Radiocarbon Laboratory
Phytolith-rich layers in archaeological sites constitute well defined stratigraphic horizons that would be invaluable if absolutely dated. Previous attempts to radiocarbon date phytoliths produced inconsistent results using plants with known ages. In this study a new approach to extract and analyze the silica occluded carbon was tested on well -dated archaeological contexts in Beth Shemesh and Tell es-Safi/Gath, and on modern wheat plants that grew in a controlled environment. Results show that by dissolving the silica using mild conditions, phytolith insoluble fractions can be extracted and their radiocarbon contents analyzed reproducibly. After phytolith dissolution, the remaining insoluble fractions with 10-30%C have radiocarbon concentrations that are statistically similar to associated charred seeds (within 2 sigma), and insoluble fractions with 40%C show concentrations that are identical to the seeds. These results show that the insoluble fraction of phytoliths is a suitable material for answering chronological questions. (C) 2016 Published by Elsevier Ltd.
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