The geochemical behavior of refractory noble metals and lithophile trace elements in refractory inclusions in carbonaceous chondrites

Details The geochemical behavior of refractory noble metals and lithophile trace elements in refractory inclusions in carbonaceous chondrites The geochemical behavior of refractory noble metals and lithophile trace elements in refractory inclusions in carbonaceous chondrites

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68..181f&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 68, no. 2, May 1984, p. 181-197.

Mathematics

Logic

18

Carbonaceous Chondrites, Geochemistry, Meteoritic Composition, Noble Metals, Refractory Metals, Trace Elements, Actinide Series, Alloys, Inclusions, Interstellar Matter, Platinum, Rare Earth Elements, Solar Corona, Transition Metals, Meteorites, Geochemistry, Refractory Elements, Metals, Lithophiles, Trace Elements, Inclusions, Carbonaceous Chondrites, Models, Calcium, Aluminum, Cais, Petrogenesis, Residue, Dust, Aggregates, Evaporation, Melting, Solar Nebula, Thermodynamics, Oxides, Condensates, Fugacity,

Scientific paper

Recent models of Ca, Al-rich (CAI) inclusion petrogenesis, and the recent availability of thermodynamic data have led to the reexamination of the geochemical behavior of the refractory noble metals (RNM) and several lithophile refractory trace elements in CAI's in the context of distillation models. Here, pertinent chemical and mineralogical properties of the various classes of refractory inclusions are reviewed, and calculations of the stability of LRTE-RNM alloys and several LRTE oxides under nebular conditions are presented. The calculations, observations and experimental results are applied to a new model of the origin of refractory metal nuggets, and a specific mechanism is identified for producing Group II chemical patterns in a cold star nebula by fractionating interstellar dust at low temperature on the basis of physical differences between different populations of pre-solar grains.

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