Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p52a..04b&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P52A-04
Other
3300 Meteorology And Atmospheric Dynamics, 5450 Orbital And Rotational Dynamics, 5744 Orbital And Rotational Dynamics, 6285 Stellar Planetary Systems : : : : : : : : : : : : : : :, 6205 Asteroids And Meteoroids
Scientific paper
Boriskino, a primitive CM carbonaceous chondrite, contains a primary sulfide assemblage of pyrrhotite, Ni-bearing monosulfide solid solution (Mss), pentlandite, and an unusual K- and P-bearing Fe-Ni sulfide. This primary sulfide assemblage shows similarities to magmatic Fe-Ni sulfides, although there is no evidence for silicate-sulfide liquid immiscibility in Boriskino. The assemblage formed in the solar nebula by one of two possible mechanisms: direct condensation of the sulfides or sulfidation of Fe-Ni metal by the reaction FeNi (metal) + H2S ’ (Fe,Ni)1-xS + H2. The sulfide assemblage equilibrated to temperatures below 610° C, the upper stability limit of pentlandite. The P in solid solution in the metal could have been the source of P in the sulfides. The K and P concentrations in the sulfide range between 0.25 and 1.00 wt.% and 0.7 and 3.4 wt.%, respectively. Experimental investigations (Boctor et al., in progress) of the condensed Fe-P-S system show solubilities of P in FeS much lower than the observed P concentrations in Boriskino sulfides. A positive correlation between Ni and P suggests that the solubility of P in Mss is enhanced by the increase of the Ni content. The presence of K and P in solid solution in the Fe-Ni sulfide in Boriskino suggests that these elements, which are sidrophile or lithophile in other meteorites, show a strong chalcophile tendency under reducing conditions in the solar nebula. The data presented suggest the possibility that during differentiation of an early Earth, both P and K could have been incorporated in a segregating metal-sulfide core.
Boctor Nabil Z.
Brekke S. E.
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