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Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affinities in the peri-Gondwanan Caledonides

Published online by Cambridge University Press:  16 July 2018

JOHN W.F. WALDRON Open the ORCID record for JOHN W.F. WALDRON [Opens in a new window] ,
DAVID I. SCHOFIELD ,
GRAHAM PEARSON ,
CHIRANJEEB SARKAR ,
YAN LUO  and
ROBERT DOKKEN
JOHN W.F. WALDRON*
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton AB T6G2E3, Canada Department of Earth Science, St. Francis Xavier University, Antigonish NS B2G 2W5, Canada
DAVID I. SCHOFIELD
Affiliation:
British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK
GRAHAM PEARSON
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton AB T6G2E3, Canada
CHIRANJEEB SARKAR
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton AB T6G2E3, Canada
YAN LUO
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton AB T6G2E3, Canada
ROBERT DOKKEN
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton AB T6G2E3, Canada
*
†Author for correspondence: john.waldron@ualberta.ca
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Abstract

The Caledonides of Britain and Ireland include terranes attributed to both Laurentian and Gondwanan sources, separated along the Solway line. Gondwanan elements to the south have been variably assigned to the domains Ganderia and East Avalonia. The Midland Platform forms the core of East Avalonia but its provenance is poorly known. Laser ablation split-stream analysis yields information about detrital zircon provenance by providing simultaneous U–Pb and Lu–Hf data from the same ablated volume. A sample of Red Callavia Sandstone from uppermost Cambrian Stage 3 of the Midland Platform yields a U–Pb age spectrum dominated by Neoproterozoic and Palaeoproterozoic sources, resembling those in the Welsh Basin, the Meguma Terrane of Nova Scotia and NW Africa. Initial εHf values suggest that the Neoproterozoic zircon component was derived mainly from crustal sources < 2 Ga, and imply that the more evolved Palaeoproterozoic grains were transported into the basin from an older source terrane, probably the Eburnean Orogen of West Africa. A sample from Cambrian Stage 4 in the Bray Group of the Leinster–Lakesman Terrane shows, in contrast, a distribution of both U–Pb ages and εHf values closely similar to those of the Gander Terrane in Newfoundland and other terranes attributed to Ganderia, interpreted to be derived from the margin of Amazonia. East Avalonia is clearly distinct from Ganderia, but shows evidence for older crustal components not present in West Avalonia of Newfoundland. These three components of the Appalachian–Caledonide Orogen came from distinct sources on the margin of Cambrian Gondwana.

Keywords

provenancezircontectonicsAppalachian–Caledonide Orogen
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 7 , July 2019 , pp. 1217 - 1232
Copyright
Copyright © Cambridge University Press 2018 

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