The Basement and Dalradian Rocks of the North Mayo Inlier

Daly, J. Stephen; Chew, David; Flowerdew, M. J.; Menuge, Julian F.; Fitzgerald, R. C.; McAteer, Claire A.; Scanlon, Ray

doi:10.1007/978-3-030-97479-4_2

A Field Guide to the Geology of Western Ireland

2022

DOI: 10.1007/978-3-030-97479-4_2

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The Basement and Dalradian Rocks of the North Mayo Inlier

J. Stephen Daly

David Chew²,

M. J. Flowerdew³

et al.

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2023

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Cited by 2 publications

References 78 publications

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A review and tectonic interpretation of the Taconian–Grampian tract between Newfoundland and Scotland: diachronous accretion of an extensive forearc–arc–backarc system to a hyperextended Laurentian margin and subsequent subduction polarity reversal

Staal

Dewey

2023

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The Taconian-Grampian tract was characterized by a diachronous collision of a north-facing oceanic arc-forearc terrane and associated backarc basins with an irregular Laurentian margin with hyperextended segments. Hyperextension produced outboard continental terranes, separated by exhumed subcontinental mantle from the inboard margin. The exhumed mantle facilitated continued subduction of the extended margin after it had entered the trench. Enhanced slab-rollback resulted in spreading in, lenticular backarc basins, which gradually transitioned along strike into extensional arcs where rollback was less. Obduction of the oceanic elements onto the irregular Laurentian margin was followed by diachronous slab breakoff and a subduction polarity reversal, such that south- and north-dipping subduction zones locally were coeval along strike. The polarity flip changed the convergence obliquity from dextral to sinistral and was accompanied by shallowing of the subducting slab near the end of the Middle Ordovician. Strike-slip movements locally juxtaposed segments where tectonic events occurred at different times, producing conflicting relationships. Slab breakoff produced punctuated magmatism, largely driven by mantle-derived melts, and drove and/or enhanced metamorphism in the overlying and enveloping crustal rocks. Boninite was generated episodically over a time span of 32 my; the oldest Cambrian phase in the LBOT and correlatives was associated with subduction initiation.

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A review and tectonic interpretation of the Taconian–Grampian tract between Newfoundland and Scotland: diachronous accretion of an extensive forearc–arc–backarc system to a hyperextended Laurentian margin and subsequent subduction polarity reversal

Staal

Dewey

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 Basement and Dalradian Rocks of the North Mayo Inlier

Cited by 2 publications

References 78 publications

A review and tectonic interpretation of the Taconian–Grampian tract between Newfoundland and Scotland: diachronous accretion of an extensive forearc–arc–backarc system to a hyperextended Laurentian margin and subsequent subduction polarity reversal

A review and tectonic interpretation of the Taconian–Grampian tract between Newfoundland and Scotland: diachronous accretion of an extensive forearc–arc–backarc system to a hyperextended Laurentian margin and subsequent subduction polarity reversal

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

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