Tectonic evolution of the Betic-Rif orogen constrained by 3-D microstructural analysis and Sm-Nd dating of garnet porphyroblasts

Aerden, Domingo; Farrell, Thomas P; Baxter, Ethan F.; Stewart, E. M.; Bouybaouène, Mohamed L.

doi:10.1002/essoar.10504637.1

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“…These differences in metamorphic nature, as well as the stacking of the initially separated NFC and Alpujárride, were explained by subduction of the NFC to the south underneath the Alpujárride Complex. However, this hypothesis has been challenged after recent studies have revealed that the two units have similar peak metamorphic ages during the Eocene (Augier et al, 2005b;Li and Massonne, 2018;Poulaki et al, 2020;Bessière et al, 2021a, Bessière et al, 2021bAerden et al, 2020). Based on our provenance data showing similar sedimentary sources throughout their depositional history, we suggest that the NFC and Alpujárride originated and remained in proximity to each other.…”

Section: Implications For the Tectonic Evolution Of The Western Medit...mentioning

confidence: 53%

“…It is possible that the NFC and Alpujárride were laterally equivalent to each other but NFC in deeper water due to more extension during the rift phase, while Alpujárride rests on a more buoyant block (Figure 10D). Eocene HP/LT metamorphic ages have been reported for both Alpujárride and the NFC (Monié et al, 1991;Augier et al, 2005a;Platt et al, 2005;Li and Massonne, 2018;Aerden et al, 2020;Bessière et al, 2021b), which indicates that the units were subducted at similar times with the NFC experiencing HP metamorphism up to 18-22 kbar (e.g., Gómez-Pugnaire and Franz, 1988;Augier et al, 2005a;Li and Massonne, 2018;Santamaría-López et al, 2019) but Alpujárride to smaller depths of around 13-15 kbar (Tubía & Ibarguchi, 1991;García-Casco and Torres Roldán, 1999;Azañón & Crespo-Blanc, 2000). It is also generally accepted that the Alpujárride complex has been exhumed prior to the NFC with the presence of low-angle normal faults and Alpujárride overlaying the NFC representing the upper plate (e.g., Sánchez-Vizcaíno et al, 2001;Augier et al, 2005a).…”

Section: Implications For the Tectonic Evolution Of The Western Medit...mentioning

confidence: 98%

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The paleotectonic evolution of the western Mediterranean: provenance insights from the internal Betics, southern Spain

Poulaki

Stöckli

2022

Front. Earth Sci.

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Since the early Cenozoic, the closure of the Alpine Tethys in the Western Mediterranean has been accomplished by protracted subduction, followed by collision and orogenic collapse. The internal zones of the Betic Cordillera (southern Spain) and Rif (northern Morocco) experienced subduction metamorphism and subsequent exhumation due to the westward migration of the orogenic system. The detrital provenance of these meta-sedimentary units contains crucial insights into their pre-subduction stratigraphic arrangement, which is essential to constrain the pre-Cenozoic paleogeography and tectonic evolution of the Western Mediterranean. This study focuses on the Nevado-Filábride Complex (NFC) and the Eastern Alpujárride Complex in the Internal Betic Cordillera. New depth-profile zircon U-Pb LA-ICP-MS data from the NFC (N = 72) and Alpujárride (N = 21) and in situ apatite U-Pb data from a metabasite within the NFC allow us to establish the pre-subduction stratigraphy, sedimentary provenance, and paleotectonic configuration of the Iberian rifted margin during the Paleozoic–Early Mesozoic. Our dataset demonstrates that the NFC represents an intact Devonian to Early Jurassic stratigraphic sequence that records the evolution of the Western Mediterranean from the Variscan orogeny to rifting and opening of the Alpine Tethys. Detrital zircon U-Pb age modes of the NFC remain remarkably similar for over 200 Myr with only the differences being the progressive addition of new zircon modes related to depositional ages. Additionally, a comparison between the provenance record of the NFC and Alpujárride reveals notably similar zircon signatures of Carboniferous and Permian strata. This study reports the first data from the Triassic–Jurassic strata that record the opening of the Alpine Tethys. Additional evidence for rifting is present in the metabasites from the Veleta unit yielding in situ apatite U-Pb ages of 197 Ma, recording CAMP magmatism and Early Jurassic rifting in the Alpine Tethys. The data demonstrate a palinspastic connection between the NFC and the Alpujárride. Based on these extensive new provenance data, we propose a pre-subduction tectonic configuration in which the NFC and Alpujárride both represent adjacent attenuated continental fragments that are separated from the southern Iberian rifted margin by a narrow oceanic domain of the Alpine Tethys in the early Mesozoic.

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Section: Implications For the Tectonic Evolution Of The Western Medit...mentioning

confidence: 53%

Section: Implications For the Tectonic Evolution Of The Western Medit...mentioning

confidence: 98%

The paleotectonic evolution of the western Mediterranean: provenance insights from the internal Betics, southern Spain

Poulaki

Stöckli

2022

Front. Earth Sci.

View full text Add to dashboard Cite

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Tectonic evolution of the Betic-Rif orogen constrained by 3-D microstructural analysis and Sm-Nd dating of garnet porphyroblasts

Cited by 1 publication

References 0 publications

The paleotectonic evolution of the western Mediterranean: provenance insights from the internal Betics, southern Spain

The paleotectonic evolution of the western Mediterranean: provenance insights from the internal Betics, southern Spain

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