Barnes, Calvin G.; Reid, Kristin; Frost, Carol D.; Barnes, Melanie; Allen, Charlotte M; Yoshinobu, Aaron S
The structurally lowest parts of the Upper Nappe of the Helgeland Nappe Complex consist primarily of migmatitic quartzofeldspathic gneiss with intercalated calc-silicate gneiss. Detrital zircons in the gneiss indicate an Ordovician depositional age. Migmatization via biotite dehydration reactions occurred at ~480 Ma at pressures of ~700 MPa; some migmatites were mobilized into cross-cutting diatexites. Diverse gabbroic to granitic plutons and dikes of the Bindal Batholith were emplaced from...[Show more]
Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.