Natural remanent magnetization of carbonaceous chondrites |
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Authors: | SK Banerjee and RB Hargraves |
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Institution: | aMaterials Science & Engineering Department, The Franklin Institute Research Laboratories, Philadelphia, Pennsylvania 19103, USA bDepartment of Geological and Geophysical Sciences, Princeton University, Princeton, N.J. ,USA |
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Abstract: | We have observed natural remanent magnetizations (NRM), ranging from 10?3 to 10?5 Gauss cm3/g, at least two orders of magnitude greater than 10?7, the noise level of our spinner magnetometer, in the carbonaceous chondrites, Orgueil, Cold Bokkeveld, Nogoya and Mighei. Preliminary alternating field demagnetization of two samples of Orgueil showed a moderate sized stable component of 10?4 Gauss cm3/g. Microscopic study reveals that a grey spinel oxide, Ni-Fe and an Fe sulphide are the principal opaque minerals in both Cold Bokkeveld and Orgueil; the oxide phase predominates in both, while the Ni-Fe is more visible in the former. Coercive force determinations in Orgueil and Cold Bokkeveld indicate single domain particles as the NRM carrier. These meteorites are suitable for the determination of the magnetic field intensity in the primary solar nebula. |
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