Archaeologia Islandica - 01.01.2009, Page 50

Archaeologia Islandica - 01.01.2009, Page 50
Richard E. Hughes and Gavin M. Lucas 140 120 100 £ 3 80 ■ cn 60- 40- 20- k|h Katla Krafla \ / \ i \ \ / / Kerlingarfjöll Hágöngur Torfajökull z'* '’v í } \ 20 40 60 80 100 120 140 160 180 200 Y (ppm) Figure 4. Sr vs. Y Composition of Obsidian Artifacts from Hofstaðir. Dashed lines demarcate the range of composition measured in geological samples. Open circles represent measurement for single obsidian source standards. Filled triangles represent measurements for Hofstaðir artifacts from Table 2. Error bars are 2-sigma (95% confidence) error estimates for artifacts and single obsidian source standards. The numbers of artifact plots do not correspond exactly to the number of specimens in Table 2 because of data convergence at this scale. excitation of the elements selected for analysis. In this case analyses were con- ducted for rubidium (Rb), strontium (Sr), yttrium (Y), zirconium (Zr), niobium (Nb) and barium (Ba) using the Ka emis- sion line for each element. All artifacts also were analyzed to determine iron vs. manganese (Fe/Mn) ratios. The analyses were conducted at 120-600 deadtime- corrected seconds, with tube current scaled to the physical size of the speci- men. Other details involving laboratory analysis protocol appear elsewhere (Hughes & Pavesic, 2005); the interested reader should consult this paper, and Hughes (1988, 1994,2005, pp. 249-250), for additional information on calibration and element-specific measurement reso- lution. Using these same instrument condi- tions, analyses were first conducted on a series of geological obsidian samples from fíve areas in Iceland to serve as a comparative baseline for artifact analysis (see Table 3; Figure 4). Table 3 com- pares trace element data published by 48

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