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oai:docta.ucm.es:20.500.14352/71182023-08-11T09:06:46Zcom_20.500.14352_14col_20.500.14352_15

Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain Álvaro, J.J. Lorenzo Álvarez, Saturnino 551.24(460) phosphate Cadomian rift Cambrian West Gondwana Geodinámica 2507 Geofísica 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. Ministerio de Ciencia e Innovación (MICINN) Depto. de Geodinámica, Estratigrafía y Paleontología Fac. de Ciencias Geológicas TRUE pub 2023-06-17T08:26:23Z 2023-06-17T08:26:23Z 2021 journal article https://hdl.handle.net/20.500.14352/7118 0016-7568 10.1017/S0016756821000339 eng projects CGL2017-87631-P IGCP 683 restricted access application/pdf Cambridge University Press