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The origin and evolution of V-rich, magnetite dominated Fe-Ti oxide mineralization; Northwest River Anorthosite, south-central Labrador, Canada
Mineralium Deposita ( IF 3.397 ) Pub Date : 2019-06-04 , DOI: 10.1007/s00126-019-00892-6
Anthony A. Valvasori, John M. Hanchar, Stephen J. Piercey, Merline L. D. Fonkwe

Abstract Zones of massive to semi-massive Fe-Ti oxide mineralization are present in the Northwest River Anorthosite, a ca. 1625-Ma Paleoproterozoic massif-type anorthosite located in the Grenville Province of south-central Labrador. The oxide mineralization is predominantly composed of coarse to very-coarse grained V-rich magnetite with less abundant coarse granular ilmenite and pleonaste that formed by exsolution from the primary, chemically impure magnetite; all observed oxide minerals have complex and abundant subsolidus reequilibration and exsolution textures. Using petrography, oxide mineral chemistry, whole-rock geochemistry, and oxide-anorthosite field relationships, a three-process model is proposed for the formation of the oxide mineralization: (1) late-stage magmatic crystallization of impure magnetite; (2) concentration of Fe-Ti oxides via solid-state remobilization; and (3) reequilibration during subsequent post-emplacement cooling and Grenvillian metamorphism. These subsolidus processes significantly modified the primary magmatic composition of the magnetite through exsolution and reequilibration. Results from in-situ magnetite EPMA and LA-ICPMS analyses were plotted on magnetite mineral chemical discrimination diagrams. The data display a wide spread and typically do not plot exclusively in the expected anorthosite-hosted Fe-Ti-V magnetite fields. This is most likely due to modification of magnetite chemistry during subsolidus cooling and reequilibration. As such, care must be taken when using magnetite discrimination diagrams for Fe-Ti-V deposits given the complex petrogenetic histories that magnetite within these types of deposits experience.
更新日期:2020-03-30

 

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