Trace elements of olivine in silicate inclusions of IAB iron meteorites reflecting low-temperature history

Details Trace elements of olivine in silicate inclusions of IAB iron meteorites reflecting low-temperature history Trace elements of olivine in silicate inclusions of IAB iron meteorites reflecting low-temperature history

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.555z&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 555

Computer Science

Inclusions, Iron Meteorites, Low Temperature, Meteoritic Composition, Temperature Profiles, Trace Elements, Cooling, Core-Mantle Boundary, Electron Probes, Ion Probes, Metallography, Olivine

Scientific paper

IAB iron meteorites with silicate inclusions may have formed at the core-mantle boundary of planetary bodies. Important constraints on the thermal evolution and the size of these bodies are given by cooling rates obtained from these meteorites. Recent metallographic cooling rates determined in metal grains enclosed in silicates of IAB irons are between 30 and 70 C/m.y. An independent method for obtaining cooling rates of IAB silicates inclusions was suggested by Kohler (1991). The Ca contents of olivines are zoned from core to rim reflecting cooling from about 650 to 500 C, at similar temperatures as kamacite-taenite exsolution occurs. Calcium zoning of ol was observed in Landes, Caddo County, Woodbine, and Persimmon Creek (recent ion microprobe data). In addition, the central Ca content of olivine grains of different IAB meteorites should also reflect cooling rates. Olivine core compositions in silicates of several IAB meteorites, e.g., Persimmon Creek (PC), El Taco (ET), Woodbine (WB), Landes (LA), Caddo County (CC), and Copiapo (COP) were determined with the electron microprobe. Results of the electron microporbe study are discussed. The use of Ca core contents and Ca profiles as indicators of low-temperature cooling rates requires further work. Nickel in ol may provide additional constraints on the thermal histories.

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