Equilibration temperatures of EL chondrites: A major downward revision in the ferrosilite contents of enstatite

Details Equilibration temperatures of EL chondrites: A major downward revision in the ferrosilite contents of enstatite Equilibration temperatures of EL chondrites: A major downward revision in the ferrosilite contents of enstatite

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..658w&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 5, p. 658-662

Computer Science

12

Chondrites, Concentration (Composition), Enstatite, Iron Compounds, Kamacite, Meteoritic Composition, Silicon Compounds, Temperature Dependence, Chemical Analysis, Graphs (Charts), Nickel, Tables (Data)

Scientific paper

A study of enstatite grains separated from EL6 chondrites shows ferrosilite contents to be approx. 0.02-0.04 mol%, about an order of magnitude lower than reported in the literature. The higher values reported earlier can probably be attributed to the excitation of Fe atoms in Fe-Ni and FeS, in part from micrometer-sized blebs of FeS and Fe-Ni commonly present in enstatite grains but mainly from large neighboring opaque grains excited by bremsstrahlung or by doubly backscattered electrons. Our EL6 ferrosilite contents are similar to those observed in coarse enstatite grains in some aubrites. The equilibrium between ferrosilite and Si-bearing kamacite is highly temperature dependent. At constant Si concentration in kamacite, the equilibrium ferrosilite mole fraction drops by a factor of roughly 2.5 for each 100 K decrease in the equilibrium temperature. As a result, the compositions of these two most common EL6 phases can be used to estimate metamorphic equilibration temperatures. The inferred temperatures are near 1200 K.

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