Phase Equilibrium Constraints on Angrite Petrogenesis

Details Phase Equilibrium Constraints on Angrite Petrogenesis Phase Equilibrium Constraints on Angrite Petrogenesis

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..769l&link_type=abstract

Lunar and Planetary Science, volume 27, page 769

Physics

Angrite, Chondrites, Eucrites, Fassaite, Partial Melting

Scientific paper

Experiments have shown that partial melting of devolatilized carbonaceous chondrite source regions can produce eucrite-like liquids at low-fO2 (IW-1) and low-SiO2, angrite-like liquids at higher fO2 (IW+2). The reason for this different behavior is reduction of ferrous iron at the lower fO2, which changes the normative character of the silicate source. Although the low fO2 experiments produced liquids closely resembling known eucrites, the match between liquids from the "high" fO2 runs and known angrites was not as close and aluminous augite (fassaite), a key mineral in angrites, was observed only at the solidus. In this paper phase diagrams are employed to illustrate the melting behavior of devolatilized chondrites minus variable amounts of iron as metal. These diagrams illustrate how partial melts of chondritic sources that have retained most of their iron can fractionate and become saturated with fassaitic clinopyroxene. However, such melts are too ferroan to have crystallized the observed clinopyroxene. Furthermore, olivine xenocrysts in LEW87051 and ASUKA881371 are too magnesian to have crystallized on any parent body capable of producing angrite-like melts, if the parent body formed by homogeneous reduction of chondrites. Some process, in addition to loss of iron and volatiles from chondrites, that increases Mg' and decreases normative silica is necessary to form the angrite source region.

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