Low-temperature magnetic properties of greigite (Fe3S4)
Chang, Liao, Roberts, Andrew P., Rowan, Christopher J., Tang, Yan, Pruner, Petr, Chen, Qianwang and Horng, Chorng-Shern (2009) Low-temperature magnetic properties of greigite (Fe3S4). Geochemistry Geophysics Geosystems, 10, (1), Q01Y04. (doi:10.1029/2008GC002276).
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We provide comprehensive low-temperature magnetic results for greigite (Fe3S4) across the spectrum from superparamagnetic (SP) to multi-domain (MD) behavior. It is well known that greigite has no low-temperature magnetic transitions, but we also document that it has strong domain-state dependence of magnetic properties at low temperatures. Blocking of SP grains and increasing thermal stability with decreasing temperature is apparent in many magnetic measurements. Thermally stable single-domain greigite undergoes little change in magnetic properties below room temperature. For pseudo-single-domain (PSD)/MD greigite, hysteresis properties and first-order reversal curve diagrams exhibit minor changes at low temperatures, while remanence continuously demagnetizes because of progressive domain wall unpinning. The low-temperature demagnetization is grain size dependent for PSD/MD greigite, with coarser grains undergoing larger remanence loss. AC susceptibility measurements indicate consistent blocking temperatures (TB) for all synthetic and natural greigite samples, which are probably associated with surficial oxidation. Low-temperature magnetic analysis provides much more information about magnetic mineralogy and domain state than room-temperature measurements and enables discrimination of individual components within mixed magnetic mineral assemblages. Low-temperature rock magnetometry is therefore a useful tool for studying magnetic mineralogy and granulometry of greigite-bearing sediments.
|Keywords:||greigite, magnetic properties|
|Subjects:||Q Science > QE Geology
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
|Date Deposited:||03 Sep 2009|
|Last Modified:||27 Mar 2014 18:48|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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