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An analysis of anomalous meteorite, Enon: classification and thermal history
Garcia, Sarah Lynn
Garcia, Sarah Lynn
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[Fort Worth, Tex.] : Texas Christian University,
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2013
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Abstract
Enon is an anomalous stony-iron meteorite having an affinity to both achondrites and ordinary chondrites. This study uses mineral chemistry, oxygen isotopes, and two-pyroxene geothermometry to understand Enon's formation history and to determine if it can be genetically related to any other known meteorite group. SEM mineral maps were used to identify texture and mineralogy, and detailed chemical analyses were obtained by electron microprobe. Oxygen isotope data was collected by analyzing powered olivine by infrared laser-assisted fluorination. The program QUILF was used to calculate the two-pyroxene closure temperature for Enon. Results indicate that Enon has approximately chondritic silicate compositions; an oxygen isotope composition similar to mesosiderites/HEDs; and experienced partial melting at the Fe, Ni-FeS eutectic and silicate recrystallization and major-element equilibration. This study suggests that Enon is a primitive achondrite that records the onset of igneous differentiation of its parent body.
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Geological Sciences