RT Book, Section
T1 U-Pb depositional age for the upper Barrios Formation (Armorican Quartzite facies) in the Cantabrian zone of Iberia: Implications for stratigraphic correlation and paleogeography
A1 Gutiérrez Alonso, Gabriel
A1 Fernández Suárez, Javier
A1 Gutiérrez Marco, Juan Carlos
A1 Corfu, Fernando
A1 Murphy, J. Brendam
A1 Suárez Barrios, María Mercedes
A2 Linnemann, Ulf
A2 Nance, R. Damian
A2 Kraft, Petr
A2 Zulauf, Gernold
AB Zircons from a >45-cm-thick K-bentonite (altered ash-fall tuff) bed within the upper Barrios Formation (Ordovician Armorican Quartzite facies), in the Cantabri-an zone of the Iberian Variscan belt were dated by isotope dilution-thermal ionization mass spectrometry. U-Pb analyses of six highly abraded single grains yielded concordant and overlapping error ellipses with a pooled concordia age of 477.47 ± 0.93 Ma. This age provides the depositional age of the Armorican Quartzite facies in the studied sector and establishes an absolute minimum age for the rifting that led to the opening of the Rheic Ocean in this section of northern Gondwana. This age is within error of the currently accepted interpolated age for the Tremadocian-Lower Ordovician Stage 2 (Floian) limit at 478.6 ± 1.7 Ma (Gradstein et al., 2004).
PB Geological Society of America
SN 9780813724232
YR 2007
FD 2007
LK https://hdl.handle.net/20.500.14352/101446
UL https://hdl.handle.net/20.500.14352/101446
LA eng
NO Gutiérrez-Alonso, Gabriel, et al. «U-Pb Depositional Age for the Upper Barrios Formation (Armorican Quartzite Facies) in the Cantabrian Zone of Iberia: Implications for Stratigraphic Correlation and Paleogeography». The Evolution of the Rheic Ocean: From Avalonian-Cadomian Active Margin to Alleghenian-Variscan Collision, de Ulf Linnemann et al., Geological Society of America, 2007. DOI.org (Crossref), https://doi.org/10.1130/2007.2423(13).
NO Ministerio de Educación y Ciencia (España)
DS Docta Complutense
RD 18 abr 2025