Almqvist, Bjarne S.G., Björk, Andreas, Mattsson, Hannes B., Hedlund, Daniel, Gunnarsson, Klas, Malehmir, Alireza, Högdahl, Karin, Bäckström, Emma, Marsden, Paul (2019) Magnetic characterisation of magnetite and hematite from the Blötberget apatite – iron oxide deposits (Bergslagen), south-central Sweden. Canadian Journal of Earth Sciences, 56 (9) 948-957 doi:10.1139/cjes-2018-0183
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Magnetic characterisation of magnetite and hematite from the Blötberget apatite – iron oxide deposits (Bergslagen), south-central Sweden | ||
| Journal | Canadian Journal of Earth Sciences | ||
| Authors | Almqvist, Bjarne S.G. | Author | |
| Björk, Andreas | Author | ||
| Mattsson, Hannes B. | Author | ||
| Hedlund, Daniel | Author | ||
| Gunnarsson, Klas | Author | ||
| Malehmir, Alireza | Author | ||
| Högdahl, Karin | Author | ||
| Bäckström, Emma | Author | ||
| Marsden, Paul | Author | ||
| Year | 2019 (September) | Volume | 56 |
| Issue | 9 | ||
| Publisher | Canadian Science Publishing | ||
| DOI | doi:10.1139/cjes-2018-0183Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 485621 | Long-form Identifier | mindat:1:5:485621:8 |
| GUID | 0 | ||
| Full Reference | Almqvist, Bjarne S.G., Björk, Andreas, Mattsson, Hannes B., Hedlund, Daniel, Gunnarsson, Klas, Malehmir, Alireza, Högdahl, Karin, Bäckström, Emma, Marsden, Paul (2019) Magnetic characterisation of magnetite and hematite from the Blötberget apatite – iron oxide deposits (Bergslagen), south-central Sweden. Canadian Journal of Earth Sciences, 56 (9) 948-957 doi:10.1139/cjes-2018-0183 | ||
| Plain Text | Almqvist, Bjarne S.G., Björk, Andreas, Mattsson, Hannes B., Hedlund, Daniel, Gunnarsson, Klas, Malehmir, Alireza, Högdahl, Karin, Bäckström, Emma, Marsden, Paul (2019) Magnetic characterisation of magnetite and hematite from the Blötberget apatite – iron oxide deposits (Bergslagen), south-central Sweden. Canadian Journal of Earth Sciences, 56 (9) 948-957 doi:10.1139/cjes-2018-0183 | ||
| In | (2019, September) Canadian Journal of Earth Sciences Vol. 56 (9) Canadian Science Publishing | ||
| Abstract/Notes | 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 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 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 shows significant correlation with the respective weight percentage 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 approximately −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. | ||
See Also
These are possibly similar items as determined by title/reference text matching only.
