Low-temperature magnetic behavior related to thermal alteration of siderite

Details Low-temperature magnetic behavior related to thermal alteration of siderite Low-temperature magnetic behavior related to thermal alteration of siderite

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w...2p&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 2-1, CiteID 2087, DOI 10.1029/2002GL016021

Physics

5

Geomagnetism And Paleomagnetism: Environmental Magnetism, Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Geomagnetism And Paleomagnetism: Remagnetization, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism

Scientific paper

To analyze the decomposition of siderite during thermal treatment, and to characterize the magnetic minerals formed as its alteration products, low-temperature magnetic measurements were conducted on natural siderite samples that were heated to different temperatures. For the unheated siderite sample, on warming curves remanence sharply decreases at 35-40 K while the in-phase AC susceptibility peaks, consistent with the Néel temperature (TN) at 38 K. The natural siderite can decompose significantly even at relatively low temperature (below 250°C). At this stage, the alteration products are hematite and probably superparamagnetic (SP) maghemite due to the quick oxidization. After 400°C, both susceptibility and SIRM of the thermally treated samples sharply increase, indicating the formation of significant amounts of strongly magnetic minerals. Furthermore, the apparently depressed Verwey transitions at 120 K indicate that most of the ferrimagnetic minerals formed by 490-530°C are either very fine grains or highly oxidized magnetite and/or maghemite.

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