Bland et al. 10.1073/pnas.0501885102. |
Table 1. The results of a series of experiments, designed to assess the possibility of a thermal effect producing volatile fractionation
Beam Ø, µm | 120 | 120 | 80 | 60 | All-LA |
Mode | Raster | Spot | Spot | Spot |
|
Energy, 10-3 J | ~0.01 | ~0.03 | ~0.05 | ~0.1 |
|
| |||||
Lu [1659] | 0.89 ± 0.12 | 0.92 ± 0.04 | 0.93 ± 0.09 | 0.92 ± 0.08 | 0.91 ± 0.06 |
Y [1429] | 0.93 ± 0.03 | 0.93 ± 0.03 | 0.97 ± 0.06 | 0.93 ± 0.05 | 0.94 ± 0.04 |
Cu [1037] | 0.80 ± 0.13 | 0.82 ± 0.15 | 0.93 ± 0.14 | 0.85 ± 0.13 | 0.84 ± 0.13 |
Ge [883] | 1.18 ± 0.27 | 1.06 ± 0.13 | 1.22 ± 0.33 | 1.04 ± 0.15 | 1.11 ± 0.21 |
Rb [800] | 1.11 ± 0.25 | 1.14 ± 0.23 | 1.17 ± 0.01 | 1.06 ± 0.17 | 1.11 ± 0.20 |
Cd [652] | 1.31 ± 0.26 | 1.35 ± 0.15 | 1.28 ± 0.31 | 1.33 ± 0.23 | 1.32 ± 0.30 |
Data are shown for a variety of elements, spanning a large range of condensation temperatures, in repeat analyses of the CI1 chondrite Alais. Condensation temperatures for elements (1) are given in brackets, and elemental abundance is ratioed to Yb and CI1. Spot size and energy input are varied to produce substantial changes in energy density. Standard deviation is shown for repeat LA analysis of different areas of matrix under the same conditions. This analysis shows that the fractionation of elements of variable volatility relative to Yb, discussed elsewhere in this article, is irrespective of ablation conditions and is similar (within error) for low and high energy density. The larger dispersion observed for volatile elements is caused by their more heterogeneous distribution in CI1 chondrites.
1. Lodders, K. (2003) Astrophys. J. 591, 1220-1247.
Tables 2-5.
Compilation of data from LA- and solution ICP-MS analyses of matrix in CV, CO, CM, CR, and anomalous carbonaceous chondrites. Data are ratioed relative to CI1 chondrite and Yb. We also include bulk literature data and solution ICP-MS analysis of Allende bulk performed as part of this study.