Geology, Main Gut, Newfoundland and Labrador

Pehrsson, S J; Brem, A G; Staal, Cees R. van

doi:10.4095/292182

2013

DOI: 10.4095/292182

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Geology, Main Gut, Newfoundland and Labrador

S J Pehrsson

A G Brem²,

Cees R. van Staal

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2023

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The provenance and tectonic history of Dashwoods and the associated Baie Verte Margin during the Ordovician to Silurian

Zagorevski

Staal

Joyce

2023

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Dashwoods is a composite peri-Laurentian terrane in Newfoundland forms the basement to the Early Ordovician to Silurian Notre Dame arc. The southern part of Dashwoods is characterized by paragneiss that is intruded by Early Ordovician to Late Silurian plutons and affected by polyphase Taconic to Salinic deformation and high-grade metamorphism. The crystalline basement of Dashwoods is not exposed and pre-Middle Ordovician paragneiss is investigated herein to constrain provenance of Dashwoods. SHRIMP U-Pb zircon analysis of the paragneiss yielded metamorphic rims ranging from ca. 395 to 500 Ma and abundant detrital grain cores ranging from ca. 546 to 1853 Ma. Presence of abundant Tonian dates differentiates Dashwoods from the adjacent Humber Margin in Newfoundland, and Hebridean and Grampian terranes in the British Isles. Detrital provenance of Dashwoods is most similar to the Baie Verte margin in Newfoundland, and Tyrone Complex and Dalradian Supergroup in Ireland. These data suggest that Dashwoods and Baie Verte margin originated near the Rockall promontory and were subsequently emplaced outboard of the Humber margin by Ordovician to Carboniferous motion along the Baie Verte - Brompton Line.

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The provenance and tectonic history of Dashwoods and the associated Baie Verte Margin during the Ordovician to Silurian

Zagorevski

Staal

Joyce

2023

View full text Add to dashboard Cite

show abstract

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Geology, Main Gut, Newfoundland and Labrador

Cited by 1 publication

References 0 publications

The provenance and tectonic history of Dashwoods and the associated Baie Verte Margin during the Ordovician to Silurian

The provenance and tectonic history of Dashwoods and the associated Baie Verte Margin during the Ordovician to Silurian

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