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Paleomagnetism and rock magnetism of martian meteorite ALH 84001

Antretter, M., and M. Fuller (2002), Paleomagnetism and rock magnetism of martian meteorite ALH 84001, Physics and Chemistry of the Earth, 27, 25-31.

The present study included analysis of the natural remanent magnetization (NRM) and magnetic characteristics of samples from the mars meteorite Allan Hills 84001. The NRM study revealed a soft moment demagnetized between 0 and 20 mT, which appeared in different sub-samples in varying amounts and directions. We found a magnetization of intermediate hardness from about 20 to 40 mT which had a consistent direction in mutually oriented sub-samples, and a harder component above 40 mT that could not be characterized. We conducted rock magnetic studies including IRM acquisition, backfield measurements, IRM and ARM demagnetization, hysteresis and thermomagnetic measurements. These studies on the carriers of magnetization show evidence for magnetite and a phase with a Curie point close to 100 degreesC. The ARM is used as an example of weak field magnetization analogous to thermal remanent magnetization. The ratio of NRM to IRM is between 1 x 10degrees and 2 x 10(-3) in the intermediate demagnetization field range between about 20 and 40 mT. In this range of demagnetization fields the NRM behaves similarly to an ARM. This contrasts with ratios of 3 x 10(-2) reported for single crystals of pyroxene [Science 275 (1997) 1629]. Our results suggest that the NRM is not grossly inhomogeneous on the scale of the sub-samples unless the Martian field was much stronger than 1 muT. (C) 2002 Elsevier Science Ltd. All rights reserved.
  author = {M. Antretter and M. Fuller},
  journal = {Physics and Chemistry of the Earth},
  pages = {25-31},
  title = {{Paleomagnetism and rock magnetism of martian meteorite ALH 84001}},
  volume = {27},
  year = {2002},
%0 Journal Article
%A Antretter, M.
%A Fuller, M.
%D 2002
%V 27
%J Physics and Chemistry of the Earth
%P 25-31
%T Paleomagnetism and rock magnetism of martian meteorite ALH 84001
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