Universidad Complutense de Madrid
E-Prints Complutense

The importance of along-margin terrane transport in northern Gondwana: insights from detrital zircon parentage in Neoproterozoic rocks from Iberia and Brittany

Impacto

Downloads

Downloads per month over past year

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

[img]
Preview
PDF
Creative Commons Attribution Non-commercial No Derivatives.

1MB

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
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

Origin of downloads

Repository Staff Only: item control page