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

Published online by Cambridge University Press:  11 May 2021

J. Javier Álvaro Open the ORCID record for J. Javier Álvaro [Opens in a new window]  and
Saturnino Lorenzo
J. Javier Álvaro*
Affiliation:
Instituto de Geociencias (CSIC-UCM), Dr. Severo Ochoa 7, 28040 Madrid, Spain
Saturnino Lorenzo
Affiliation:
Departamento de Ingeniería Geológica y Minera – IGeA, Universidad de Castilla-La Mancha, Manuel Meca 1, 13400Almadén, Spain
*
Author for correspondence: J. Javier Álvaro, Email: jj.alvaro@csic.es
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Abstract

In the Central Iberian Zone, the Cadomian orogenic collapse is represented by chaotic megabreccias, olistostromes and mélange deposits reflecting a drastic change from slope-related deposits, fed by denudation of the Cadomian arc, to offshore-dominant 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 – lower Terreneuvian Ibor Group from the overlying Terreneuvian San Lorenzo and Fuentepizarra formations. The sedimentation of the San Lorenzo Formation reflects two palaeogeographic scenarios: (i) a low-angle stable basement recording shoaling-upward siliciclastic cycles, and (ii) perturbations of basement fault scarps feeding slope-related conglomeratic channels, with NE-directed palaeocurrents, and sourced from topographic palaeohighs controlled by the movement along synsedimentary normal fault systems, such as the so-called El Guijo Fault. The intra-Fortunian age of the pre-rift unconformity is constrained by the ichno- and microfossil content of the succession, and is bracketed between the first occurrence of Treptichnus pedum in the Arrocampo Formation (Ibor Group) and of Anabarella plana in the Fuentepizarra Formation.

Keywords

phosphateCadomianriftCambrianWest Gondwana
Type
Original Article
Information
Geological Magazine , Volume 159 , Special Issue 7: THEMATIC ISSUE: The Ediacaran System and the Ediacaran-Cambrian Transition , July 2022 , pp. 1251 - 1261
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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