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Magnetic characterisation of magnetite and hematite from the Blötberget apatite-iron-oxide deposits (Bergslagen), south-central Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0002-9385-7614
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. CSIRO, Mineral Resources, Bradfield Road, West Lindfield, NSW 2070, Australia.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.ORCID iD: 0000-0002-5433-0908
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-3574-2146
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2019 (English)In: Canadian journal of earth sciences (Print), ISSN 0008-4077, E-ISSN 1480-3313, Vol. 56, no 9, p. 948-957Article in journal (Refereed) Published
Abstract [en]

Rock magnetic measurements were carried out on drill core material and hand specimens from the Blötberget apatite-iron oxide deposit in the Bergslagen ore province, south-central Sweden, to characterise their magnetic properties. Measurements included several kinds of magnetic susceptibility and hysteresis parameters. Petrographic and scanning electron microscopy (SEM) were used to independently identify and quantify the amount and type of magnetite and hematite. Two hematite-rich samples were studied with laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to quantify the trace element chemistry in hematite and investigate the potential influence of trace elements on magnetic properties. Three aspects of this study are noteworthy. 1) Hematite-rich samples display strong anisotropy of magnetic susceptibility, which is likely to affect the appearance and modelling of magnetic anomalies. 2) The magnitude-drop in susceptibility across Curie and Néel temperature transitions show significant correlation with the respective weight percent (wt%) of magnetite and hematite. Temperature dependent magnetic susceptibility measurements can therefore be used to infer the amounts of both magnetite and hematite. 3) observations of a strongly depressed Morin transition at ca -60 to -70 C (200 to 210 K) are made during low-temperature susceptibility measurements. This anomalous Morin transition is most likely related to trace amounts of V and Ti that substitute for Fe in the hematite. When taken together, these magnetic observations improve the understanding of the magnetic anomaly signature of the Blötberget apatite-iron oxide deposits and may potentially be utilised in a broader context when assessing similar (Paleoproterozoic) apatite-iron oxide systems.

Place, publisher, year, edition, pages
Canadian Science Publishing , 2019. Vol. 56, no 9, p. 948-957
Keywords [en]
apatite – iron oxide, magnetic properties, magnetite, hematite, Kiruna-type deposit
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-374225DOI: 10.1139/cjes-2018-0183ISI: 000486365100007OAI: oai:DiVA.org:uu-374225DiVA, id: diva2:1280412
Funder
Vinnova, 2014-06238The Geological Survey of Sweden (SGU)Available from: 2019-01-18 Created: 2019-01-18 Last updated: 2019-10-31Bibliographically approved

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Almqvist, BjarneMattsson, Hannes B.Hedlund, DanielGunnarsson, KlasMalehmir, AlirezaHögdahl, Karin

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Almqvist, BjarneMattsson, Hannes B.Hedlund, DanielGunnarsson, KlasMalehmir, AlirezaHögdahl, Karin
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GeophysicsDepartment of Earth SciencesMineralogy Petrology and TectonicsSolid State Physics
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