1990
DOI: 10.2113/gsecongeo.85.8.1770
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Isotope systematics of the Kiruna magnetite ores, Sweden; Part 1, Age of the ore

Abstract: U-Pb isotope dating of zircons from a granophyric dike complex which crosscuts the Kiirunavaara magnetite-apatite body demonstrates that the ore was emplaced before 1.880 ___ 0.003 Ga. Whole-rock Sm-Nd isotope compositions for five out of six samples from the footwall and hanging-wall complexes lie on a 1.89 ___ 0.09-Ga isochron. The initial ratio of 0.50991 ___ 0.00007 corresponds to e•a(T) ---5.6 and suggests a substantial late Archean component in the igneous rocks.Since the ore cannot have been emplaced af… Show more

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Cited by 59 publications
(27 citation statements)
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References 11 publications
(17 reference statements)
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“…Multiple phases of magnetite growth, with or without apatite, are evident. Similar textures have been described from Kiruna (Frietsch, 1978;Cliff et al, 1990). The infilling of late-stage fractures within apatite by magnetite implies that, towards the end of the mineralization period, apatite was no longer stable.…”
Section: Ore Texturessupporting
confidence: 72%
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“…Multiple phases of magnetite growth, with or without apatite, are evident. Similar textures have been described from Kiruna (Frietsch, 1978;Cliff et al, 1990). The infilling of late-stage fractures within apatite by magnetite implies that, towards the end of the mineralization period, apatite was no longer stable.…”
Section: Ore Texturessupporting
confidence: 72%
“…3c). Similar textures have also been described from Kiruna (Cliff et al, 1990). Many of the apatite crystals have fibrous margins, and some have been completely replaced by fibrous aggregates of finegrained apatite reflecting a late-stage hydrothermal alteration process.…”
Section: Ore Texturessupporting
confidence: 71%
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“…Conventional methods for identification and mapping of variously enriched zones in iron ore deposits, for example, are based on geological and mineralogical studies considering variations in the proportions of magnetite, hematite, and apatite, such as in Kirunatype iron deposits (Cox and Singer, 1986;Hitzman et al, 1992;Shayestehfar et al, 2006). The Kiruna-type iron ores are generally dominated by iron oxides, either magnetite or hematite, which are known to occur in the Kiruna-Gällivare iron province in northern Sweden and in the Bafq-Saghand iron district in central Iran (Bonyadi et al, 2011;Cliff et al, 1990;Forsell and Godin, 1980;Frutos and Oyarzún, 1975;Shayestehfar et al, 2006). In this type of iron deposit, magnetite is found at deeper levels compared to hematite.…”
Section: Introductionmentioning
confidence: 99%