RT Journal Article
T1 The importance of along-margin terrane transport innorthern Gondwana: insights from detrital zircon parentagein Neoproterozoic rocks from Iberia and Brittany
A1 Fernández Suárez, Javier
A1 Gutiérrez Alonso, Gabriel
A1 Jeffries, Teresa E.
AB 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.
PB Elsevier Science B.V., Amsterdam
SN 0012-821X
YR 2002
FD 2002
LK https://hdl.handle.net/20.500.14352/60433
UL https://hdl.handle.net/20.500.14352/60433
LA eng
DS Docta Complutense
RD 1 may 2024