A chemical, crystallographic and magnetic characterisation of individual iron-oxide grains in Hawaiian lavas.

ABSTRACT: Our knowledge on the behaviour of the geomagnetic field through time critically depends on how information of the past state of the field is recorded by, and stored in iron-bearing minerals such as magnetite. For small, single domain grains these processes are described by classical Néel theory, but the magnetic behaviour of larger, pseudo-single domain or multidomain grains, still is enigmatic. Here we present a chemical, crystallographic and magnetic characterisation of three to six individual, large (~3-10 μm) iron-oxide grains from eleven different flows sampled on the Big Island of Hawai'i. These grains were all subjected to a Magnetic Force Microscopy study to characterise their magnetic domain structure; a Microprobe analyses to assess their chemical composition; and a Scanning Elec

SUBMITTER: Ter Maat GW 

PROVIDER: S-EPMC6091240 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature