NDLI: Elemental composition and history of metal in the Pesyanoe and Norton County enstatite achondrites

Content Provider	Springer Nature Link
Author	Lyul’, A. Yu. Kolesov, G. M. Lavrent’eva, Z. A.
Copyright Year	2013
Abstract	The composition (determined by INAA) of the Fe,Ni phase of the Norton County and Pesyanoe enstatite achondrites (aubrites) indicates that the fractionation trends of elements in the metal phase of aubrites are different from those predicted using the purely condensation or magmatic models for the genesis of aubrites. Metal nodules in aubrites with chemical composition similar to that of the metal of enstatite chondrites are relics of the primary condensates of the protoplanetary nebula. The matrix metal, which is depleted in refractory Ir relative to moderately volatile elements, underwent magmatic differentiation. The positive Ni-Au, Ni-As, and Au-As correlations in the metal of the Pesyanoe and Norton County aubrites and the negative Ir-Ni (Au) correlations in the matrix metal and nodules with low Ir concentrations testify to genetic relationship between these metal fractions. The matrix metal was produced by the partial melting of the nodules, which are the primary metal of the parent planetesimal body that had an enstatite chondrite composition. Its melting and differentiation produced the aubrite material. The composition of the aubrite Fe,Ni phase is consistent with the model of aubrite origin in two stages during the early evolution of the Solar System as a result of gravitational agglomeration of fragments that were ejected from different depths of a primary planetesimal with following formation of an asteroidal size body.
Starting Page	777
Ending Page	791
Page Count	15
File Format	PDF
ISSN	00167029
Journal	Geochemistry International
Volume Number	51
Issue Number	10
e-ISSN	15561968
Language	English
Publisher	Springer US
Publisher Date	2013-09-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	enstatite achondrites metal elemental composition formation Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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