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Muxworthy, Adrian R.; Heider, Franz

doi:10.1023/a:1022036229596

Studia Geophysica Et Geodaetica

2001

DOI: 10.1023/a:1022036229596

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Adrian R. Muxworthy

Franz Heider

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Cited by 6 publications

(1 citation statement)

References 30 publications

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“…Until samples can be returned from the martian surface, paleomagnetic studies of young dated shergottites, nakhlites, and chassignites (SNC) meteorites are the only way to infer the magnetic field strength during their emplacement. However, even on Earth rocks, paleointensity experiments are notoriously difficult with high failure rates (Muxworthy & Heider, 2001). The limited number of available meteorites further limits the prospect of experiments on uncontaminated martian material.…”

mentioning

confidence: 99%

Paleointensity and Rock Magnetism of Martian Nakhlite Meteorite Miller Range 03346: Evidence for Intense Small‐Scale Crustal Magnetization on Mars

Volk

Mittelholz³

et al. 2021

JGR Planets

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The Mars Global Surveyor (MGS) mission revealed that the martian crust is strongly magnetized even though Mars has no active dynamo magnetic field (Acuña et al., 1999(Acuña et al., , 2001. This observation implies that the crustal rocks acquired a remanent magnetization in an internally generated dynamo field that ceased to exist. Magnetic field models created from the MGS and later Mars Atmosphere and Volatile Evolution (MAVEN) mission data have allowed for detailed studies of the crustal magnetic field (

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mentioning

confidence: 99%

Paleointensity and Rock Magnetism of Martian Nakhlite Meteorite Miller Range 03346: Evidence for Intense Small‐Scale Crustal Magnetization on Mars

Volk

Mittelholz³

et al. 2021

JGR Planets

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Identification of magnetic minerals by scanning electron microscope and application of ferrofluid

Kletetschka

Kontny

2005

Stud Geophys Geod

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Magnetic minerals are mostly identified by a combination of rock magnetic and microscopic techniques and the ferrofluid method in combination with an optical microscope was applied during the last decades. But today, scanning electron microscopy (SEM) is preferred for the observation of mineral phases because its depth of focus and resolving capability at the same magnification. In this study, we report on a method, which allows ferrofluid application under the SEM. We coated a polished basalt sample containing titanomagnetite grains with high demagnetizing fields, with a colloidal suspension containing magnetite particles (ferrofluid) ranging in size between 11 and 20 nm. Due to large gradients of multidomain grains the ferrofluid particles adhered to their surfaces. Other grains of similar composition present (ilmenohematite) but with low demagnetizing fields do not generate large magnetic gradients and therefore do not attract the colloidal particles. Upon evaporation of the ferrofluid and covering the sample with conducting material the magnetic grains with high demagnetizing field are easily identifiable under the scanning electron microscope. The different mineralogy observed by this method is confirmed by temperature dependent variation of magnetic susceptibility, revealing titanomagnetite and ilmenohematite as magnetic carriers in the basaltic samples.

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A combined rock magnetic and geochemical investigation of Upper Cretaceous volcanic rocks in the Pontides, Turkey

et al. 2009

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Upper Cretaceous volcanic rocks were collected at 24 sites along the Pontides, N-NE Turkey, for rock magnetic and geochemical studies. Rock magnetic and petrographic methods showed that the lavas are characterized predominantly by titanomagnetites with a mixture of pseudo-single and multi-domain grains, whereas in tephrite single domain titanohematite was dominant. Measurements of magnetic susceptibility and the geochemical properties on different volcanic rock types provide important knowledge about the magnetic stability of the rocks. The magnetic properties are interpreted in terms of the composition, concentration, magma generation. Tephrite and phonotephrites with the highest intensities (5200 mA/m) and high magnetic susceptibility values (2585  10 5 ), largest grain sizes and Fe/Ti values, showing minor or no alteration are the most magnetic stable samples in contrast to dacites with the lowest intensity-magnetic susceptibility (520 mA/m -573  10 5 ) and high alteration degree. The basanite samples show very low NRM (48165 mA/m) but very high magnetic susceptibility (29063100  10 5 ) values suggesting the alteration of Fe-Ti minerals. It is shown that the magnetic properties of the basic to acidic rocks show a systematic variation with magma differentiation and could be related to fractional crystallization. Major and trace elements revealed that the lavas are compatible with complex magma evolution, with mineral phases of olivine+magnetite+clinopyroxene in basic series, amphibole+ +clinopyroxene in intermediate rocks and plagioclase+clinopyroxene+biotite in acidic series.K e y w o r d s : natural remanent magnetization, thermal demagnetization, alternating demagnetization, volcanic rocks

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Cited by 6 publications

References 30 publications

Paleointensity and Rock Magnetism of Martian Nakhlite Meteorite Miller Range 03346: Evidence for Intense Small‐Scale Crustal Magnetization on Mars

Paleointensity and Rock Magnetism of Martian Nakhlite Meteorite Miller Range 03346: Evidence for Intense Small‐Scale Crustal Magnetization on Mars

Identification of magnetic minerals by scanning electron microscope and application of ferrofluid

A combined rock magnetic and geochemical investigation of Upper Cretaceous volcanic rocks in the Pontides, Turkey

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