期刊
JOURNAL OF ARCHAEOLOGICAL SCIENCE
卷 37, 期 7, 页码 1437-1446出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jas.2010.01.003
关键词
Strontium isotopes; Laser ablation; LA-MC-ICP-MS; Diagenesis; South Africa; Rodent
资金
- National Science Foundation (USA) [0609963]
- Max Planck Society
- Direct For Social, Behav & Economic Scie
- Division Of Behavioral and Cognitive Sci [0609963] Funding Source: National Science Foundation
This study tests the precision and accuracy of laser :ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) for measuring strontium isotope ratios ((87)Sr/(86)Sr) in fossil teeth from Swartkrans and Sterkfontein in South Africa, and explores the extent of diagenesis in these specimens. Compared to solution MC-ICP-MS or thermal ionization mass spectrometry (TIMS) methods, LA-MC-ICP-MS can be faster and less expensive, but has lower precision and accuracy. We found that (87)Sr/(86)Sr ratios in fossil rodent teeth measured by LA-MC-ICP-MS were offset from solution values by a mean of 0.0005 +/- 0.0010 (2 sigma). Because of the very wide spread of biologically available (87)Sr/(86)Sr ratios (similar to 0.710 to similar to 0.790) in the region, LA-MC-ICP-MS is more than sufficient for assessing the geographic origins of the fossil rodents. The concentration of strontium in modern and fossil enamel from the area is statistically indistinguishable, as is the range of (87)Sr/(86)Sr ratios in modern rodents and fossil rodents from Swartkrans. Thus, there is little evidence of diagenetic Sr in the fossil enamel. In contrast, the fossil dentine may contain up to similar to 50% diagenetic strontium, although many dentine (87)Sr/(86)Sr ratios are still far removed from the background cave value of 0.729. We propose that LA-MC-ICP-MS will also be of use for investigating the geographic origins of other, non-rodent fossil teeth from the Sterkfontein and Swartkrans collections, and may prove of similar utility at other suitable sites. (C) 2010 Elsevier Ltd. All rights reserved.
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