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Lower Alcudian-Domo Extremeno Supergroup

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Journal Article

Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain Available to Purchase

J. Javier Álvaro, Saturnino Lorenzo
Published: 11 May 2021
Geological Magazine (2022) 159 (7): 1251–1261.
DOI: https://doi.org/10.1017/S0016756821000339
... settings episodically punctuated by phosphogenetic processes. In the Ibor and Alcudia anticlines, the pre-rift unconformity is marked by paraconformable to angular discordant contacts separating variable tilted strata of the Ediacaran Lower Alcudian – Domo Extremeño Supergroup and the upper Ediacaran...
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View PDF for article title, Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain
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(a) Geological sketch of the Variscan Central Iberian Zone from the Iberian Massif with setting of the Ibor and Alcudia anticlines; abbreviations: Aa – Alcudia anticline; Ia – Ibor anticline; Va – Valdelacasa anticline; modified from Julivert et al. (1972); CRHSG – Ciudad Rodrigo–Hurdes–Sierra de Gata domain; Schist-Metagreywacke Complex refers to the Ediacaran–Cambrian strata unconformably overlain by the Lower Ordovician Armorican Quartzite formation. (b) Geological map of a part of the Ibor anticline (boxed in (a)) showing the scouring surface that marks the contacts of the Ibor Group/San Lorenzo Formation and Lower Alcudian – Domo Extremeño Supergroup/San Lorenzo unconformities; updated from Gil Serrano (1985), Monteserín López & López (1985), Nozal Martín (1985) and Nozal Martín & Pérez Rojas (1985); 681, 682, 707 and 708 refer to geological maps at 1:50 000 scale. Section logs in the vicinities of Castañar de Ibor (39° 38′ 41.87″ N, 5° 24′ 51.12″ W), La Calera (39° 30′ 45″ N, 05° 15′ 31″ W) and Alía (31° 29′ 36.25″ N, 5° 11′ 45.42″ W) villages.

(a) Geological sketch of the Variscan Central Iberian Zone from the Iberian... Available to Purchase

Published: 11 May 2021
of the Ibor Group/San Lorenzo Formation and Lower Alcudian – Domo Extremeño Supergroup/San Lorenzo unconformities; updated from Gil Serrano ( 1985 ), Monteserín López & López ( 1985 ), Nozal Martín ( 1985 ) and Nozal Martín & Pérez Rojas ( 1985 ); 681, 682, 707 and 708 refer to geological maps at 1:50
Image
Facies and geometrical relationships of the San Lorenzo Formation. (a) Angular discordance separating the greywackes of the Lower Alcudian – Domo Extremeño Supergroup (left) from the overlying Fuentepizarra Formation; Fresneda river creek, Alcudia anticline. (b) Complete shoaling cycle from shales grading upsection into sandstone, pebbly sandstone and conglomerate from the San Lorenzo Formation at Gargantilla stream, Alcudia anticline. (c) Shale/sandstone alternations exhibiting thickening-upward cycles, up to 14 cm thick; Castañar de Ibor, Ibor anticline. (d) Pinkish conglomerate-to-pebbly sandstones with fining-upward trends from the San Lorenzo Formation at the stratotype. (e) Photomicrograph of a conglomerate with litharenitic matrix rich in polyphase clasts including vein quartz and ironstone subunits and mafic volcaniclasts from the San Lorenzo Formation at La Calera log. (f) Photomicrograph of a sandy channel scouring a massive iron oxyhydroxide groundmass from the base of the San Lorenzo Formation at Gargantilla stream; scale bars = 2 mm; abbreviations: co – conglomerate; ir – ironstone; ma – mafic volcaniclast; s – sandstone; sh – shale. Length of hammer for scale is 32 cm. Length of pen for scale is 13 cm.

Facies and geometrical relationships of the San Lorenzo Formation. (a) Angu... Available to Purchase

Published: 11 May 2021
Fig. 5. Facies and geometrical relationships of the San Lorenzo Formation. (a) Angular discordance separating the greywackes of the Lower Alcudian – Domo Extremeño Supergroup (left) from the overlying Fuentepizarra Formation; Fresneda river creek, Alcudia anticline. (b) Complete shoaling cycle
Journal Article

Ordovician tectonics and crustal evolution at the Gondwana margin (Central Iberian Zone) Available to Purchase

M. Francisco Pereira, Carlos Fernández, Carmen Rodríguez, António Castro
Published: 04 August 2022
Journal of the Geological Society (2022) 179 (5): jgs2021-168.
DOI: https://doi.org/10.1144/jgs2021-168
... and Lorenzo 2021 ). Three main unconformities have been recognized ( Fig. 2 ). The oldest angular unconformity is intra-Ediacaran, occurring within the SGC siliciclastic sequence ( Linnemann et al. 2008 ; Talavera et al. 2015 ). It separates the Ediacaran Lower Alcudian–Domo Extremeño Supergroup...
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Journal Article

Geology and palaeontology of the Codos anticline, eastern Iberian Chains, NE Spain: age constraints for the Ediacaran–Cambrian boundary in the Iberian Chains Open Access

Michael Streng
Published: 23 July 2021
Geological Magazine (2022) 159 (7): 1240–1250.
DOI: https://doi.org/10.1017/S0016756821000595
.... 2019 ). In contrast to Vidal et al . ( 1999 ) who regarded the Alcudia succession as entirely conformable, Álvaro et al . ( 2019 ) describe it as non-continuous, characterized by two major stratigraphic gaps. The Ediacaran Lower Alcudian-Domo Extremeño Supergroup is unconformably followed...
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View PDF for article title, Geology and palaeontology of the Codos anticline, eastern Iberian Chains, NE Spain: age constraints for the Ediacaran–Cambrian boundary in the Iberian Chains
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