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Magnetites from a sulphide bearing iron ore formation in Sweden

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Abstract

Magnetite coexisting with sulphides from an iron ore formation in northern Sweden has been investigated with micro-probe and X-ray methods. The Mg/Mg + Fe ratio in magnetite can be correlated with the presence or absence of coexisting pyrite, indicating varying sulphur pressure in the rocks. Sulphurization of magnetite is assumed to be responsible for the introduction of Mg into the magnetite structure.

Zusammenfassung

Magnetit aus einem Eisenerz Nordschwedens, der zusammen mit Eisensulfiden vorkommt, wurde mittels Elektronen-Mikrosonde und Röntgenbeugung untersucht. Das Mg/Mg + Fe Verhältnis des Magnetits wurde zu der Anwesenheit oder dem Fehlen von Pyrit in Beziehung gesetzt. Es zeigt sich, daß unterschiedliche Schwefeldampfdrucke in den Gesteinen geherrscht haben müssen. Die Sulfidisierung des Magnetits wird für den Einbau des Mg in die Magnetit-Struktur verantwortlich gemacht.

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Annersten, H. Magnetites from a sulphide bearing iron ore formation in Sweden. Mineral. Deposita 4, 234–240 (1969). https://doi.org/10.1007/BF00207126

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