Abstract
Primary pseudo-single and single-domain magnetite inclusions in quartzite cobbles of the Jack Hills (Western Australia): implications for the Hadean geodynamo
Highlights
Single silicate crystals are attractive targets for probing the nature of the past geomagnetic field because they often contain minute magnetic minerals with ideal recording properties (Cottrell & Tarduno 1999, 2000; Feinberg et al 2005; Dunlop 2002)
Jack Hills quartzite cobble samples studied here are from the collections detailed by Tarduno & Cottrell (2013) and Bono et al (2018)
The iron oxides are found in clusters, likely due to isolated deposition layers carrying the grains, which may be revealed during sample preparation
Summary
Single silicate crystals are attractive targets for probing the nature of the past geomagnetic field because they often contain minute magnetic minerals with ideal recording properties (Cottrell & Tarduno 1999, 2000; Feinberg et al 2005; Dunlop 2002). Selkin et al 2008; Muxworth et al 2013) form the basis for our current understanding of the strength of the field during Archean times. These data provide a consistent picture of a robust field, similar in strength to the modern one. All older extant rocks have been observed to have metamorphic grades of amphibolite facies (or higher) and incompatible with the preservation of primary magnetic signals
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