Inherited arc signature in Ediacaran and Early Cambrian basins of the Ossa-Morena Zone (Iberian Massif,Portugal): Paleogeographic link with European and North African Cadomian correlatives |
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| Affiliation: | 1. 1401 N. Camino de Juan, Tucson, AZ 85745, USA;2. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada;3. Department of Earth, Atmospheric & Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;1. Departamento de Petrología y Geoquímica e Instituto de Geociencias (UCM, CSIC), Universidad Complutense de Madrid, 28040 Madrid, Spain;2. Instituto Dom Luiz, Departamento de Geociências, Escola de Ciências e Tecnologia, Universidade de Évora, Apartado 94, 7001-554 Évora, Portugal;3. Instituto Geológico y Minero de España, 28760 Tres Cantos, Madrid, Spain;1. Departamento de Petrología y Geoquímica e Instituto de Geociencias (UCM, CSIC), Universidad Complutense, 28040 Madrid, Spain;2. Institut für Geowissenschaften, Goethe-University Frankfurt, 60438 Frankfurt, Germany;3. Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland, South Africa;4. Instituto Geológico y Minero de España, La Calera 1, 28760, Tres Cantos, Madrid, Spain;5. CAI de Geocronología y Geoquímica Isotópica, Universidad Complutense, 28040 Madrid, Spain;1. Departamento de Geología, Universidad de Oviedo, C/Jesús Arias de Velasco s/n, 33005 Oviedo, Asturias, Spain;2. Departamento de Geología, Universidad de Salamanca, Salamanca 37008, Spain;3. Área de Laboratorios, Instituto Geológico y Minero de España (IGME), C/La Calera 1, 28760 Tres Cantos, Madrid, Spain;4. Instituto Geológico y Minero de España (IGME), C/Matemático Pedrayes 25, 33005 Oviedo, Asturias, Spain;5. Institut für Geowissenchaften, Goethe Universität, Altenhöferallee 1, 60438 Frankfurt, Germany |
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| Abstract: | Geochemical data from clastic rocks of the Ossa-Morena Zone (Iberian Massif) show that the main source for the Ediacaran and the Early Cambrian sediments was a recycled Cadomian magmatic arc along the northern Gondwana margin. The geodynamic scenario for this segment of the Avalonian-Cadomian active margin is considered in terms of three main stages: (1) The 570–540 Ma evolution of an active continental margin evolving oblique collision with accretion of oceanic crust, a continental magmatic arc and the development of related marginal basins; (2) the Ediacaran–Early Cambrian transition (540–520 Ma) coeval with important orogenic magmatism and the formation of transtensional basins with detritus derived from remnants of the magmatic arc; and (3) Gondwana fragmentation with the formation of Early Cambrian (520–510 Ma) shallow-water platforms in transtensional grabens accompanied by rift-related magmatism. These processes are comparable to similar Cadomian successions in other regions of Gondwanan Europe and Northwest Africa. Ediacaran and Early Cambrian basins preserved in the Ossa-Morena Zone (Portugal and Spain), the North Armorican Cadomian Belt (France), the Saxo-Thuringian Zone (Germany), the Western Meseta and the Western High-Atlas (Morocco) share a similar geotectonic evolution, probably situated in the same paleogeographic West African peri-Gondwanan region of the Avalonian-Cadomian active margin. |
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