A magnetic study of the Millbillillie (eucrite) achondrite - Evidence for a dynamo-type magnetising field

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Achondrites, Dynamo Theory, Magnetic Properties, Meteoritic Composition, Mineralogy, Australia, Demagnetization, Kamacite, Shock Loads, Solar System Evolution, Volcanology

Scientific paper

The magnetic properties of the Millbillillie eucrite have been studied using mutually oriented samples. The magnetic carrier has been identified as single domain/pseudosingle domain kamacite. It is believed that, due to clast-rich/clast-poor layering, the rock has been subjected to minimum shock since formation. This is supported by the presence of a stable, unidirectional remanence. Three separate palaeointensity tests (IRM/NRM, ARM-NRM, and Thellier heating) have been used to determine the strength of the palaeofield. The results obtained indicate that the rock cooled in a strong magnetic field. Modes of formation, given that Millbillillie has a layered structure, and the nature of the HED parent body, are discussed. Calculations based on the assumption that 4 Vesta is a possible HED parent body indicate that an iron core may be present in such a body.

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