Detection of a S-33 excess in an oldhamite separate from Norton County

Details Detection of a S-33 excess in an oldhamite separate from Norton County Detection of a S-33 excess in an oldhamite separate from Norton County

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.540t&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 540-541

Other

7

Allende Meteorite, Meteoritic Composition, Oxygen Isotopes, Sulfur Isotopes, Ureilites, Chemical Composition, Nuclear Fusion, Relic Radiation

Scientific paper

It has recently been demonstrated that the S isotopic composition of meteorites has some resemblance to O. Different bulk meteorites possess unique isotopic signatures, perhaps deriving from nebular chemistry. In addition, the aubrites possess a bulk isotopic composition identical to the enstatite chondrites and different from all other classes as in the case of O isotopes. Recently, we reported a possible excess S-33 in ureilites, and a S-33 excess has previously been reported in an acid residue extract from Allende. Since the ureilites are thought to possess some pristine carbonaceous chondritic component there is the possibility that this could be a relict nucleo-synthetic component. It has been suggested that oldhamite in aubrites could be a quasirelict condensate, thus it is a good candidate for S isotopic analysis. Oldhamite was separated from the Norton County meteorite, a brecciated enstatite achondrite with a complex igneous history that possesses oldhamite as a relatively rare accessory phase. Isotopic analysis of a subsample of a large oldhamite nugget from the UNM collection was made. The present measurements thus suggest that the excess is real, reproducible, and possible evidence of a nucleosynthesis component. Analysis of other oldhamite separates are presently underway and will be reported.

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