caa a22 4500 60614935X CHVBK 20210128100533.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00531-015-1171-5 doi (NATIONALLICENCE)springer-10.1007/s00531-015-1171-5 SHRIMP U-Pb geochronological constraints on the timing of the intra-Alcudian (Cadomian) angular unconformity in the Central Iberian Zone (Iberian Massif, Spain) [Elektronische Daten] [C. Talavera, D. Martínez Poyatos, F. González Lodeiro] New SHRIMP U-Pb ages of detrital zircons from Neoproterozoic low-grade metasandstones of the Schist-Graywacke Complex (Central Iberian Zone, Iberian Massif) sampled just below and above the intra-Alcudian unconformity at two selected locations contribute to reconstruct the geodynamic evolution of Iberia during the Cadomian orogeny in the north Gondwana margin. The youngest zircons (i.e., maximum depositional age) in the Lower Alcudian are c. 580-576Ma, while those in the Upper Alcudian are c. 555-552Ma. The obtained remarkable time gap of about 21Ma supports the existence of a tectonic event in between. This event resulted in moderate folding (without related foliation/metamorphism) that verticalized the Lower Alcudian previous to the deposition of the Upper Alcudian. Additional evidence of late Cadomian tectonothermal events elsewhere in Iberia also fit in the interval c. 560-550Ma. Combined with other geological data, the most probable maximum depositional ages are c. 580-560Ma for the Lower Alcudian (previous to the late Cadomian folding event) and c. 550-540Ma for the Upper Alcudian (previous to the deposition of the overlying Pusian Group and Lower Cambrian sandstones and limestones). A comparison of the new zircon age spectra with possible source areas verifies recent studies that point to the Cadomian foreland in the north Gondwana continent affected by the Pan-African orogeny: the West African Craton and/or the Saharan Metacraton. Furthermore, ongoing Cadomian arc-related magmatism in Iberia (c. 605-545Ma) could have contributed as a local zircon source. The end of the Cadomian activity is marked by a transient stage (ephemeral Lower Cambrian platform) which preceded widespread Cambro-Ordovician rifting of north Gondwana. Springer-Verlag Berlin Heidelberg, 2015 Detrital zircon nationallicence Alcudian unconformity nationallicence Central Iberian Zone nationallicence SHRIMP U-Pb geochronology nationallicence Talavera C. Department of Imaging and Applied Physics, Bentley Campus, Curtin University, GPO Box U1987, 6845, Perth, WA, Australia aut Martínez Poyatos D. Department of Geodynamics, Campus Fuentenueva, University of Granada, 18002, Granada, Spain aut González Lodeiro F. Department of Geodynamics, Campus Fuentenueva, University of Granada, 18002, Granada, Spain aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/7(2015-10-01), 1739-1757 1437-3254 104:7<1739 2015 104 531 https://doi.org/10.1007/s00531-015-1171-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-015-1171-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Talavera C. Department of Imaging and Applied Physics, Bentley Campus, Curtin University, GPO Box U1987, 6845, Perth, WA, Australia aut NATIONALLICENCE 700 1- Martínez Poyatos D. Department of Geodynamics, Campus Fuentenueva, University of Granada, 18002, Granada, Spain aut NATIONALLICENCE 700 1- González Lodeiro F. Department of Geodynamics, Campus Fuentenueva, University of Granada, 18002, Granada, Spain aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/7(2015-10-01), 1739-1757 1437-3254 104:7<1739 2015 104 531