U-Pb geochronology of detrital and igneous zircon grains from the Águilas Arc in the Internal Betics (SE Spain): Implications for Carboniferous-Permian paleogeography of Pangea

Jabaloy‐Sánchez, Antonio; Talavera, Cristina; Peces, Martín Jesús Rodríguez; Vázquez-Vílchez, Mercedes; Evans, Noreen J.

doi:10.1016/j.gr.2020.10.013

Cited by 17 publications

(22 citation statements)

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“…Our proposal moreover reconciles certain data regarding the provenance of the Alboran domain, including Paleozoic rocks from the Malaguide, Ghomaride, and Alpujarride complexes, whose age patterns derived from detrital zircon populations coincide with those from the Variscan European margin. This is especially clear for the Malaguide and Ghomaride complexes, having detrital zircon population ages equivalent to those of the Paleozoic rocks presently cropping out in Menorca, the Northeastern Iberian massif, and the South of France (Azdimousa, Jabaloy‐Sánchez, Talavera, et al., 2019; Jabaloy‐Sánchez et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Serravallian extension in Mallorca coincided with a period of deep paleogeographic changes on the island, which evolved from a mostly marine realm to a continental one (Ramon & Simo, 1986)—a process that altered its sediment provenance. During the Burdigalian and Langhian, the turbidite systems in Mallorca, fed from the South (Rodríguez‐Perea, 1984), included clasts of “exotic” Paleozoic grauwackes resembling the Carboniferous sequence that crops out in Menorca and the Malaguide complex at the top of the Betic internal zones (Bourrouihl, 1983; Cohen, 1980; Hollister, 1942), for which a common NE Iberian Massif origin was recently proposed (Jabaloy‐Sánchez et al., 2021). This implies the existence of a Paleozoic emerged hinterland of the Mallorca FTB located to the South during the Early Miocene, compatible with the Malaguide complex of the Alboran domain (Figure 15).…”

Section: Discussionmentioning

confidence: 99%

“…Based on published data-mostly from the Alboran domain in the Betics-we propose that the BP formed the hinterland of the Alboran and Kabilyan (AlKa) domains of the Paleogene AlKaPeKa orogen (Figure 13). Remains of the AlKa orogen segment are now represented by the Alpujarride-Malaguide and Sebtide-Ghomaride thrust stacks in the Betics and Rif, formed by continental rocks compatible with a North Iberian Massif origin, according to detrital zircon age populations; thus they would correspond to the nearby Paleozoic sequence of Menorca and the Catalan Coastal Ranges (Azdimousa, Jabaloy-Sánchez, Talavera, et al, 2019;Jabaloy-Sánchez et al, 2021;Martínez et al, 2016). The lower plate of this continental subduction system was represented by the Alpujarride-Sebtide complex, which underwent HP/LT metamorphism (e.g., Azañón et al, 1997;Booth-Rea et al, 2002;Goffé et al, 1989) dated as Paleocene-Eocene based on Ar/Ar in phengite (Bessière et al, 2021;Marrone et al, 2020Marrone et al, , 2021Platt et al, 2005).…”

Section: Eocene Tectonic Setting For the Bpmentioning

confidence: 99%

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Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

et al. 2021

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We study the structure of the Llevant ranges in Mallorca with special emphasis on the Cenozoic extensional evolution of the island, which we integrate in a new geodynamic model for the Westernmost Mediterranean. Mallorca underwent two Cenozoic rifting phases in the Oligocene and Serravallian, before and after the development of its Foreland Thrust Belt (FTB). The first extensional event produced Oligocene semigrabens (≈29–23 Ma) that were inverted during the Early‐Middle Miocene (19–14 Ma) WNW‐directed FTB development. The second rifting event produced the extensional collapse of the Mallorca FTB during the Serravallian (≈14–11 Ma). This later rifting was polyphasic, with two orthogonal extensional systems, producing first NE‐SW, and then NW‐SE extension. The Oligocene extension affected a major part of the Western Mediterranean, opening the Liguro‐Provençal and other basins after the collapse of the Palaeogene AlKaPeCa orogen, and Mallorca, its former hinterland. Continued plate convergence nucleated a new subduction system in the Early Miocene that initiated along the Ibiza transform, producing the Mallorca WNW‐directed FTB and subduction of the South‐East Iberian passive margin. This process individualized the Betic‐Rif slab and initiated its westward retreat. Serravallian extension occurred at the northern edge of the subduction system coeval to the Algero‐Balearic basin opening. Extension initiated toward the SW direction of slab tearing and later rotated to a NW‐SE direction, probably in response to flexural and isostatic rebound. Through these processes the Alboran domain archipelago was driven toward the southwest until the Late Miocene, contributing to the present isolation of Mallorca from its Betic hinterland.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Eocene Tectonic Setting For the Bpmentioning

confidence: 99%

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Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

et al. 2021

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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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“…The NFC contains a (ultra)mafic unit, where the presence of often metamorphosed Jurassic gabbros, dolerites, (pillow)basalts, pelagic sediments, and peridotites implies a dominantly ocean-derived character (Puga et al, 2011;Puga et al, 1999). However, a number of observations such as the presence of depleted and serpentinized mantle rocks, Al-rich xenolits in the metabasites, mafic dykes intruded into continental formations, and the analysis of detrital U-Pb zircon populations suggest that the rock succession might have originated from a hyper-extended continental margin setting (Gomez-Pugnaire and Munoz, 1991;Jabaloy-Sánchez et al, 2021;Laborda-López et al, 2020;Morten et al, 1987), similar to the the West Iberian Atlantic margin (e.g. Reston et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Burial-exhumation cycles in the continental crust derived from Mediterranean field studies and numerical modelling

Porkoláb¹

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U-Pb geochronology of detrital and igneous zircon grains from the Águilas Arc in the Internal Betics (SE Spain): Implications for Carboniferous-Permian paleogeography of Pangea

Cited by 17 publications

References 74 publications

Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

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

Burial-exhumation cycles in the continental crust derived from Mediterranean field studies and numerical modelling

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