Magnetism on the Angrite Parent Body and the Early Differentiation of Planetesimals

Magnetism on the Angrite Parent Body and the Early Differentiation of Planetesimals

Angrites are among the oldest known pristine basaltic meteorites and record the earliest stages of planet formation and differentiation. Our paleomagnetic analysis of three angrites found that they record a past magnetic field of ~10 microteslas on the angrite parent body extending from 4564 to at l...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) Vol. 322; no. 5902; pp. 713 - 716
Main Authors: Weiss, Benjamin P, Berdahl, James S, Elkins-Tanton, Linda, Stanley, Sabine, Lima, Eduardo A, Carporzen, Laurent
Format: Journal Article
Language:English
Published: Washington, DC American Association for the Advancement of Science 31-10-2008
The American Association for the Advancement of Science
Subjects:
Achondrites
Cooling
Cosmochemistry. Extraterrestrial geology
Cosmology
Demagnetization
Earth
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geology
Magnetic fields
Magnetization
Meteorites
Meteorites. Tectites. Impactites
Meteors & meteorites
Petrology
Planetesimals
Rotating generators
Solar systems
meteorites
inverse thermoremanent magnetization
magnetic field
achondrites
parent bodies
planet differentiation
basaltic composition
dynamos
planetesimals
hysteresis
stony meteorites
angrite
paleomagnetism
natural remanent magnetization
alternating field demagnetization
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Summary:Angrites are among the oldest known pristine basaltic meteorites and record the earliest stages of planet formation and differentiation. Our paleomagnetic analysis of three angrites found that they record a past magnetic field of ~10 microteslas on the angrite parent body extending from 4564 to at least 4558 million years ago. Because the angrite paleomagnetic record extends beyond the expected lifetime of the early circumstellar disk, these paleofields were probably generated internally on the angrite parent body, possibly by an early dynamo in a rapidly formed metallic core.
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.1162459