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Ordovician and Silurian Magmatism in the Upper Nappe, Uppermost Allochthon, Helgeland Nappe Complex, North-Central Norway

Barnes, Calvin G.; Reid, Kristin; Frost, Carol D.; Barnes, Melanie; Allen, Charlotte M; Yoshinobu, Aaron S

Description

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]

CollectionsANU Research Publications
Date published: 2011
Type: Journal article
URI: http://hdl.handle.net/1885/32597
Source: Norsk Geologisk Tidskrift - Norwegian Journal of Geology

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