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Transformation of Fe–Ti gabbro to coronite, eclogite and amphibolite in the Baie du Nord segment, Manicouagan Imbricate Zone, eastern Grenville Province by Cox; Indares is a Earth and Planetary Sciences article available to read on EtoBox.

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Fe–Ti gabbros from the Baie du Nord Segment of the Manicouagan Imbricate Zone, metamorphosed under high __P–T__ conditions during the Grenvillian orogeny, have been the focus of a detailed micropetrological study. Textures and mineral chemistry suggest that the mineral assemblages represent progressive stages of metamorphic transformation resulting in the formation of coronas, pseudomorphs after igneous phases (transitional) and true, granoblastic eclogites. The transitional and eclogitic samples also have coronas which are developed locally around igneous xenocrysts of plagioclase and olivine. The deformed margins of coronitic Fe–Ti gabbros are transformed to amphibolite and contain clinopyroxene‐bearing leucosomes with garnet poikiloblasts that are indicative of high‐__P–T__ dehydration melting. Interpretation of garnet zoning and thermobarometry suggest that the highest __P–T__ conditions are recorded by coronas around xenocrysts (__c.__ 720–800 °C at 14–17 kbar) and garnet–clinopyroxene cores in granoblastic assemblages (__c.__ 740–820 °C at 13–17 kbar) in the eclogitic samples. Re‐equilibration during the early stages of exhumation at high‐__T__ conditions (>700 °C) affected a

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Author

Cox; Indares

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; University of California Press (ISSN 0263-4929)

Published

1999

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)