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The ore genesis of the Paleoproterozoic iron oxide apatite deposits in the vicinity of Kiruna in northern Sweden is poorly understood, despite a century-long mining history and 2500Mt of iron ore with grades of 30 to 70wt% Fe produced in the region to date. Zircon grains from the ore, recently dated at ca. 1874Ma, show very different appearances compared to zircon from surrounding host rocks (ca....
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