Ordovician and Silurian Magmatism in the Upper Nappe, Uppermost Allochthon, Helgeland Nappe Complex, North-Central Norway
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]
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|Source:||Norsk Geologisk Tidskrift - Norwegian Journal of Geology|
|01_Barnes_Ordovician_and_Silurian_2011.pdf||8.8 MB||Adobe PDF||Request a copy|
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