U–Pb detrital zircon ages from the Paleozoic Marbella Conglomerate of the Malaguide Complex (Betic Cordilleras, Spain). Implications on Paleotethyan evolution

Esteban, José Julián; Cuevas, Julia; Tubía, José María; Gutiérrez-Alonso, Gabriel; Ларионов, А. Н.; Сергеев, С. А.; Hofmann, Mandy

doi:10.1016/j.lithos.2017.07.022

Cited by 9 publications

(3 citation statements)

References 64 publications

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“…Here, new detailed geochronologic constraints provide key data and observations to better understand the paleogeographic evolution of the region and its relationship with the Alpujárride Complex in the Internal Betics. There have been only four samples analyzed from the Maláguide complex (Esteban et al, 2017;Jabaloy-Sánchez et al, 2021) and from internal zones of the Rif Cordillera (Azdimousa et al, 2019); hence a robust correlation between all internal units is not possible at this time. We compare our provenance results with a recent DZ compilation by Stephan et al (2019) to decipher unique source terranes, including Avalonia, West Africa, East Africa-Arabia, and Baltica/Peri-Laurentia.…”

Section: Correlations Of the Nevado-filábride Complex With Alpujárrid...mentioning

confidence: 99%

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: Correlations Of the Nevado-filábride Complex With Alpujárrid...mentioning

confidence: 99%

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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“…The Malaguide complex is structurally the highest tectonic nappe of the Internal Zones. It is composed of a Paleozoic sedimentary succession unconformably overlain by widespread Triassic, including redbeds and subordinate conglomerates (Esteban et al, 2017;Perri et al, 2013). Remnants of unmetamorphosed Jurassic and Cretaceous strata are represented by limestones.…”

Section: 1029/2020tc006093mentioning

confidence: 99%

Tectono‐Stratigraphic and Thermal Evolution of the Western Betic Flysch: Implications for the Geodynamics of South Iberian Margin and Alboran Domain

et al. 2020

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The Betic‐Rif orogen is a key region to understand the evolution of the plate boundary between Africa and Iberia/Europe. This study focuses on the Flysch Complex, which is considered the sedimentary cover of a domain originally positioned between the Iberian and Alboran margins. Based on stratigraphic and depositional evolution constraints, evidence for salt tectonics, combined with new apatite fission‐tracks (AFT) and (U‐Th‐Sm)/He ages from the Flysch Complex and the Subbetic Zone, we propose a geodynamic interpretation for the formation of the Betic Cordillera, accounting for moderate N‐directed transport of the Flysch Complex and synchronous exhumation between External and Internal Zones of the Betic. Early contraction between Africa and Iberia/Europe is reflected in the Cretaceous Flysch basin by a prolonged period of residence in the partial annealing zone for AFT and onset of foreland subsidence at 50 Ma. This stage lasted until the Early to Middle Miocene (20–15 Ma), marked by the rapid succession, in less than 5 Ma, of the deposition of Cenozoic flysch and their rapid exhumation. This event is interpreted to reflect the W‐directed retreating mantle delamination between Africa and Iberia margins at the origin of the collapse of the proto‐Betic orogenic domain and formation of the Alboran domain.

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“…The same observation was made in the Betics (Esteban et al, 2017;Jabaloy-Sánchez et al, 2020;Santamaría-López and Sanz de Galdeano, 2018) and the Pyrenees (Filleaudeau et al, 2012). In contrast, the South Portuguese Zone south of the Rheic suture shows evidence of a Silurian to Mid-Devonian event (380-420 Ma) superimposed on the dominant Cadomian event (Pereira et al, 2017(Pereira et al, , 2014(Pereira et al, , 2012Pérez-Cáceres et al, 2017).…”

Section: The Iberian Peninsula: Geology and Mining Districtsmentioning

confidence: 57%

The significance of galena Pb model ages and the formation of large Pb-Zn sedimentary deposits

Milot¹,

Blichert‐Toft²,

Sanz³

et al. 2021

Chemical Geology

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In an attempt to clarify the significance of Pb model ages in Pb-Zn sedimentary deposits, we report high-precision Pb isotopic compositions for 64 galenas and 52 K-feldspars, the former from ores and the latter separated from granites. All samples are from Spain and the French Pyrenees. Lead from galena ores is of unequivocal continental origin. With few exceptions, Pb model ages systematically exceed emplacement ages by up to 400 Ma, a gap which is well outside the uncertainties of ~30 Ma assigned to the model. The histogram of the new high-precision Pb isotope data shows prominent peaks of galena Pb model ages at 94±38 Ma and 392±39 Ma. When the data are consolidated with literature data and examined in 3-dimensional Pb isotope space, cluster analysis identifies five groups. The model ages of the peaks occur, in order of decreasing peak intensity, at 395±40 (Middle Devonian), 90±34 Ma (Middle Cretaceous), and 613±42 Ma (Neoproterozoic), with two minor peaks at 185+26 Ma (Jurassic) and 313±41 (Upper Carboniferous). To a large extent, the model ages centered around these peaks correspond to distinct localities. The ages of the peaks do not coincide with any of the Betic, Variscan, or Pan-African tectonic events, which are the main tectonic episodes that shaped Iberian geology, but rather match well-known global oceanic anoxic events. It is argued that surges of metals weathered from continental surfaces scorched during anoxic events accumulated and combined in anoxic water masses with unoxidized marine sulfide released by submarine hydrothermal activity to precipitate the primary Pb-Zn stock. Frozen Pb isotope compositions require that galenas from black shales are the source of the final ores. The Revised manuscript with no changes marked Click here to view linked References sulfides were later remobilized by large-scale convective circulation of basinal and hydrothermal fluids. The peaks of K-feldspar Pb model ages are distinct from those of galenas and do not correlate with magmatic emplacement ages. It is suggested that they instead reflect local circulation in Paleozoic sediments surrounding individual plutons. While Pbisotopes can be used as a regional provenance tool, such an approach requires that the data are considered in a fully 3-dimensional space.

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U–Pb detrital zircon ages from the Paleozoic Marbella Conglomerate of the Malaguide Complex (Betic Cordilleras, Spain). Implications on Paleotethyan evolution

Cited by 9 publications

References 64 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

Tectono‐Stratigraphic and Thermal Evolution of the Western Betic Flysch: Implications for the Geodynamics of South Iberian Margin and Alboran Domain

The significance of galena Pb model ages and the formation of large Pb-Zn sedimentary deposits

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