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- W109408510 abstract "Stannern trend eucrites are not only richer in incompatible trace element than the other eucrites, but their trace element patterns are clearly distinctive, with pronounced nega-tive Be, Sr and Eu anomalies. Many authors have proposed that the diversity of the eucritic melts could simply reflect part of the diversity of the primary melts from the parent body mantle [e.g., 1- 3]. Alternatively, to explain the decoupling of major elements from incompatible trace elements requires a complex scenario involving interaction between eucritic and highly residual melts [4-5]. As an alternative to previous hypotheses for the origin of Stannern trend eucrites, we propose a model of contamination of ordinary eucrites by melts produced by melting of the asteroidal crust. The composition of melts generated by the partial melting of eucritic crust can be calculated theoretically. The first partial melts would certainly not be acidic, but rather intermediate to basic in composition. We have calculated the trace element abundances of melts produced by partial melting of an equili-brated eucrite using literature partition coefficients, and the com-position of our reference eucrite Juvinas The calculated magmas produced by partial melting of a eucritic crust are rich in incom-patible trace elements and display pronounced negative anoma-lies in K, Ba, Be, Sr, Eu and Ti relative to ordinary eucrites. Con-tamination of a normal eucrite by a crustal partial melt should have little effect on its major element concentration, but a huge impact on the incompatible trace element abundance, which is exactly the variation displayed by Stannern trend eucrites. We have calculated the melts obtained by simple mixing between a eucrite and a crustal partial melt produced by 10 % melting. The trace element abundances are strikingly well reproduced by this model. The trace element concentrations of Stannern, and Bou-vante are explained by a combination of about 85 % Juvinas and 15 % crustal partial melt. The calculated proportions are obvi-ously dependent to the compositions of the end members. For example, very different proportions are obtained using the partial melts calculated for 5 % or 15 % of melting of the eucritic crust." @default.
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- W109408510 date "2007-08-01" @default.
- W109408510 modified "2023-09-26" @default.
- W109408510 title "ARE STANNERN-TREND EUCRITES ORDINARY EUCRITES CONTAMINATED BY CRUSTAL PARTIAL MELTS?" @default.
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