Magnetic petrology of eastern North America diabases, I. Olivine-normative dikes from western South Carolina

Warner, R. D.; Wasilewski, P. J.

doi:10.1016/0012-821x(90)90036-w

Earth and Planetary Science Letters

1990

DOI: 10.1016/0012-821x(90)90036-w

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Magnetic petrology of eastern North America diabases, I. Olivine-normative dikes from western South Carolina

R. D. Warner¹,

P. J. Wasilewski²

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Cited by 5 publications

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“…In addition, M --f/NHoo implies that observed magnetizations should be a few percent of the applied field or less (since f is rarely over a few percent for terrestrial rocks, and 1IN is of order unity), i.e., less than a few A m -1. Significantly stronger magnetizations, of order 10 A m-•, are commonly reported for diabase dikes [Warner and Wasilewski, 1990;Strangway, 1961]…”

mentioning

confidence: 80%

Remanent ferromagnetism and the interior structure of Ganymede

Crary¹,

Bagenal²

1998

J. Geophys. Res.

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Abstract. The Galileo spacecraft discovered that Jupiter's moon, Ganymede, has both an internal magnetic field and a strongly differentiated interior. This has prompted new models of Ganymede's interior, featuring an iron core and dynamo action to produce the magnetic field. However, extant dynamo action is not necessary to produce Ganymede's magnetic fields. The rocky material within Ganymede is believed to be rich in iron-bearing minerals, particularly magnetite, and its outer layer is capable of holding strong remanent magnetism. We investigate two sources of reinanent ferromagnetism: Jupiter's magnetic field, especially in the past, when Ganymede was closer to Jupiter due to tidal evolution, and a paleomagnetic field from dynamo action which is no longer active. In this analysis we use a model of remanent magnetization similar to those which have been applied to the Moon, Mars, and Mercury, but we have generalized it to apply to strongly magnetic materials. We find that magnetization by the jovian background field can account for no more than 5.6% of Ganymede's internal field.However, a paleomagnetic field of roughly 10,000 nT or greater (at least 15 times the current field of Ganymede and a third that of the Earth's current field) is capable of producing su•cient reinanent magnetization to account for the Galileo observations, given very favorable assumptions about the magnetic properties of the rock layer. For more probable values a paleomagnetic field equal to or greater than the Earth's current field is necessary.

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mentioning

confidence: 80%

Remanent ferromagnetism and the interior structure of Ganymede

Crary¹,

Bagenal²

1998

J. Geophys. Res.

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Rock magnetic stratigraphy of a mafic layered sill: A key to the Karoo volcanics plumbing system

Maes

Ferré

Tikoff

et al. 2008

Journal of Volcanology and Geothermal Research

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The Sonju Lake layered intrusion, northeast Minnesota: Internal structure and emplacement history inferred from magnetic fabrics

Maes

Tikoff

Ferré

et al. 2007

Precambrian Research

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Magnetic petrology of eastern North America diabases, I. Olivine-normative dikes from western South Carolina

Cited by 5 publications

References 20 publications

Remanent ferromagnetism and the interior structure of Ganymede

Remanent ferromagnetism and the interior structure of Ganymede

Rock magnetic stratigraphy of a mafic layered sill: A key to the Karoo volcanics plumbing system

The Sonju Lake layered intrusion, northeast Minnesota: Internal structure and emplacement history inferred from magnetic fabrics

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