Compositional continuity of enstatite chondrites and implications for heterogeneous accretion of the enstatite chondrite parent body

Details Compositional continuity of enstatite chondrites and implications for heterogeneous accretion of the enstatite chondrite parent body Compositional continuity of enstatite chondrites and implications for heterogeneous accretion of the enstatite chondrite parent body

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.4895k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 61, p. 4895

Computer Science

27

Enstatite, Chondrites, Chemical Composition, Neutron Activation Analysis, Metamorphism (Geology), Abundance, Volatility

Scientific paper

This paper reports results obtained by instrumental neutron activation analysis of 11 enstatite chondrites and magnetic separates (metal and nonmagnetic fractions) prepared from them. The purposes of this study are (1) to precisely determine elemental concentrations in the enstatite chondrites and to study the compositional relationship between the EH3, EL3, EH5, and EL6 chondrites, and (2) to better understand the metamorphic histories of the EH and EL groups, in relation to that of the ordinary chondrites. The replicate analyses of the enstatite chondrites show a compositional continuity for lithophile, chalcophile, and siderophile elements. Abundances of nonvolatile lithophiles increase from EH4,5, to EH3, EL3, and EL5,6. In contrast, those of nonvolatile and less volatile chalcophile elements, such as V and Cr, decrease weakly, and those of nonvolatile siderophiles and moderately volatile elements decrease apparently within this sequence. The decrease of moderately volatile element abundances from EH4,5, to EH3, EL3, and EL5,6 is independent of the mineralogy of the enstatite chondrites.

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