Constraints on the formation conditions of iron meteorites based on concentrations and isotopic compositions of nitrogen

Details Constraints on the formation conditions of iron meteorites based on concentrations and isotopic compositions of nitrogen Constraints on the formation conditions of iron meteorites based on concentrations and isotopic compositions of nitrogen

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3105f&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 13, p. 3105-3121.

Computer Science

19

Chemical Composition, Iron Meteorites, Meteoritic Composition, Nitrogen, Chemical Analysis, Interstellar Chemistry, Isotopes, Meteorites, Iron Meteorites, Origin, Formation, Concentration, Phases, Isotopes, Composition, Nitrogen, Samples, Meteorite, Laboratory Studies, Parent Bodies, Phases, Shock Effects, Iiiab Irons, Iab Irons, Nitrides, Abundance, Volatiles, Trace Elements, Cooling Rate, Procedure, Metal, Distribution, Catalog, Kamacite, Taenite, Residue, Comparison, Data, Plessite, Deformation, Crystall

Scientific paper

The behavior of nitrogen in the iron meteorite parent bodies and any constraints this can place on the origin and formation of these meteorites are investigated using results of an analysis of isotopic composition of nitrogen in a suite of iron meteorites. On the basis of their nitrogen concentration and isotopic composition, the iron meteorite groups are divided into four clusters. Groups IC, IIAB, IIIAB, and IIIE have delta N-15 values between -95 and -75 percent; groups IAB and IIICD, the two main nonmagmatic groups, have delta N-15 values between -65 and -55 percent; and group IIC has delta N-15 values which range from +125 to +155 percent. All the remaining groups (IID, IIE, IIF, IIIF, IVA, and IVB) have delta N-15 values around 0 percent. It is suggested that one possible cause of heterogeneity may have been the result of an injection of live Al-26 or Fe-60, together with N-15-rich nitrogen, into the early solar nebula. Such a scenario may account for the observed trend of increasing delta N-15 value with more rapid cooling rate.

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