Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.v44a..01m&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #V44A-01
Other
1015 Composition Of The Core, 1025 Composition Of The Mantle, 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 1065 Trace Elements (3670)
Scientific paper
Trace siderophile and chaolcophile element concentrations in various materials (metals, silicates, oxides, sulfides, carbides, etc.) are, in general, poorly documented and accordingly their geochemical and cosmochemical behavior are not well understood. Hence, our understanding of the conditions of core-mantle equilibrium that followed planetary accretion is highly dependent on data from only a few samples. Moreover, for many of these elements we have scant data for the solid-solid and or solid-melt partitioning behavior over a spectrum of physio-chemical environments. In addition, recent suggestions have also alerted us to the possibilities that other elements, not conventionally considered siderophile or chalcophile (e.g., K, Nb, Ta, Mn), may have been sequestered into core-forming melts in the early Earth. We have conducted a wide range of in-situ analyses (laser-ablation-ICP-MS) of natural and synthetic materials to determine partitioning behavior of trace elements, including several "unconventional" siderophile and chalcophile elements. Element concentrations in minerals and melts are determined at levels ranging from ppm to sub-ppb. Here we highlight 3 examples of our studies: (1) characterization of phases in Fe-meteorites, (2) basalt-olivine melt partitioning, and (3) olivine-kamacite partitioning from pallasite meteorites. We demonstrate that it is possible to measure directly the concentrations of some siderophiles (including the PGEs) in silicate minerals and melts and, in some cases, co-existing metal phases and thus generate high quality partition coefficients. Our data now provide opportunities to fully quantify the chemical evolution of these elements in solidifying magmatic systems. [An accompanying abstract in this session, Watson et al., provides an additional example of similar studies (diffusion of trace siderophiles in metal phases) being conducted in our lab.]
Ash Richard D.
Brenan James M.
McDonough William F.
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