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Fernández Suárez, Javier and Gutiérrez Alonso, Gabriel and Jeffries, Teresa E. (2002) The importance of along-margin terrane transport in northern Gondwana: insights from detrital zircon parentage in Neoproterozoic rocks from Iberia and Brittany. Earth and Planetary Science Letters, 204 . pp. 75-88. ISSN 0012-821X
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Official URL: https://www.journals.elsevier.com/earth-and-planetary-science-letters
Abstract
Detrital zircons from late Neoproterozoic rocks of the peri-Gondwanan Cadomian belt of SW Iberia and north Armorican Domain of Brittany record Neoproterozoic (ca. 860-550 Ma), Palaeoproterozoic (ca. 2300-1800) and Archaean (ca 3300-2600 Ma) U-Pb ages. The absence of Mesoproterozoic zircons suggests that these terranes evolved in a peri-W African realm. This is in contrast to other western European terranes that preserve Mesoproterozoic zircons and are likely to have evolved in a peri-Amazonian realm. Such a contrast in detrital zircon populations, coupled with the presence of Mesoproterozoic zircons in the Ordovician Armorican quartzite, deposited in a peri-African platform, is interpreted to record along-margin terrane transport. The change in provenance suggests that subduction was replaced by transform faults that juxtaposed Amazonia-derived terranes against W Africa-derived terranes to form the Avalonia and Armorica microcontinents. Subsequent extension along the margin resulted in the birth of the Rheic Ocean and the outboard drift of Avalonia.
Item Type: | Article |
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Uncontrolled Keywords: | U-Pb dating; 213 nm laser ablation ICP-MS; Zircon; Armorica; Iberia; Gondwana |
Subjects: | Sciences > Geology > Geodynamics Sciences > Geology > Petrology |
ID Code: | 58684 |
Deposited On: | 23 Jan 2020 13:00 |
Last Modified: | 17 Feb 2020 07:40 |
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