The Geometry and Kinematics of the Southwestern Termination of the Pyrenees: A Field Guide to the Santo Domingo Anticline

Pueyo, Emilio L.; Oliva‐Urcia, Belén; Sánchez‐Moreno, Elisa M.; Arenas, Concha; Silva-Casal, Roi; Calvín, Pablo; Santolaria, Pablo; García‐Lasanta, Cristina; Oliván, C.; Gil-Imaz, A.; Compaired, F.; Casas, A.; Pocoví, A.

doi:10.1007/978-3-030-60143-0_3

Cited by 2 publications

(4 citation statements)

References 131 publications

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“…Black line: data from the Boltaña anticline (Mochales et al, 2012a). Red line: data from the Santo Domingo anticline (Pueyo et al, 2021). The light area around the data corresponds to the α95 angle of the related fisherian means.…”

Section: Discussionmentioning

confidence: 99%

“…15;16), i.e. Pico del Aguila (Pueyo et al, 2002;Rodríguez-Pintó et al, 2008), Boltaña (Mochales et al, 2012a;Muñoz et al, 2013) and Santo Domingo anticlines (Pueyo et al, 2021).…”

Section: Isochrony or Diachrony Of The South Pyrenean Rotational Move...unclassified

“…Due to the high degree of preservation, the outcropping of abundant syntectonic series and the exceptional chronostratigraphic framework based on numerous and outstanding biostratigraphic (Serra-Kiel et al, 1998 and magnetostratigraphic studies (see recent reviews by Garcés et al, 2020;Pérez-Rivarés et al, 2018;Vinyoles et al, 2020) together with the occurrence of VAR (witnessed by plentiful paleomagnetic studies; , the Southern Pyrenees is an exceptional location to characterize the rotational kinematics of thrust fronts. Pioneer works at the Pico del Águila anticline (Pyrenean sole thrust) in the Central External Sierras (Pueyo et al,2002) were followed by others in closer structures; the Boltaña anticline (Mochales et al, 2012a) and the Aínsa Basin (Muñoz et al, 2013), pilot studies in the Mediano anticline (Beamud et al, 2017) to the East and in the Santo Domingo anticline to the West (Pueyo et al, 2021). The rotation velocity of the Balzes anticline was also preliminarily studied in its northern part (Rodríguez-Pintó, 2013 andRodríguez-Pintó et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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The chronology and rotational kinematics in the South-Eastern Jaca Basin (Southern Pyrenees): Las Bellostas section

Pueyo

Rodríguez-Pintó²,

Serra‐Kiel³

et al. 2022

GeA

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Despite the large number of magnetostratigraphic studies in the South Pyrenean Basin aiming to calibrate the basin chronostratigraphy and the biostratigraphic scales, the South Eastern Jaca Basin remains unexplored from this perspective, and its relation with the Ainsa Basin is not fully understood. In this work we contribute with new magnetostratigraphic data from the 950m thick Las Bellostas section, located in the northern hinge of the Balzes anticline. Well-proven primary signal (positive fold test and two pseudo-antiparallel polarities) supported by numerous primary data in the surroundings allow us building a reliable local polarity sequence of eight magnetozones (from R1 to N4). Additionally, seven new biostratigraphic samples (Nummulites and Assilina) in the lower part of the section (marine environment) allows tightening the section to the Geomagnetic Polarity Time Scale (GPTS) and proposing a refined age model for the southeastern Jaca Basin. The section starts in the Boltaña Fm., of Cuisian age (Shallow Benthic Zone, SBZ11), is followed by a sedimentary gap from C22n to C20n as witnessed by biostratigraphic data (SBZ11 underneath the hiatus and SBZ16 just atop). The deltaic Sobrarbe Fm. can be tracked until the C19n (Late Lutetian). From this point (200m) until the top of the section (950m), at least, the entire C18n chron can be recognized within the molassic Campodarbe Fm. (C18n.2n-C18n.1r and C18n.1n) (Bartonian) equivalent to the West to the prodeltaic Arguis marls Fm. The Middle Cusian (SBZ11) to Middle Lutetian (SBZ15) stratigraphic hiatus is, in part, enhanced by the structural position at the hinge of the Balzes anticline. These new chronostratigraphic constraints help refining the W-E and N-S stratigraphic relationships in the eastern Jaca Basin and in the Ainsa Basin. This section also allows us to accurately refine the kinematics of the rotational activity in the eastern External Sierras. The important difference in magnetic declination along the section and neighboring paleomagnetic data from the Balzes anticline (from ≈70º clockwise at the base of the stratigraphic section to non-significant at the top) together with the new age model for the Eastern Jaca Basin help characterizing the rotational activity of the Balzes thrust sheet. The rotation took place between chrons C20r (Middle Lutetian; 45Ma) and C17 (Lower Priabonian 37-38Ma) in agreement to nearby structures (Boltaña, Picodel Aguila anticlines) but clearly diachronic to western ones (Santo Domingo anticline). Besides, the rotational activity seems to follow a linear and continuous pattern (velocity 9-11º/Ma, R: 0.83-0.96) in contrast to closer structures that show two distinct rotational velocities (i.e. Boltaña). These new data still let open the debate on the rotational kinematics along the South Pyrenean basal thrust.

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Section: Discussionmentioning

confidence: 99%

“…15;16), i.e. Pico del Aguila (Pueyo et al, 2002;Rodríguez-Pintó et al, 2008), Boltaña (Mochales et al, 2012a;Muñoz et al, 2013) and Santo Domingo anticlines (Pueyo et al, 2021).…”

Section: Isochrony or Diachrony Of The South Pyrenean Rotational Move...unclassified

Section: Introductionmentioning

confidence: 99%

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The chronology and rotational kinematics in the South-Eastern Jaca Basin (Southern Pyrenees): Las Bellostas section

Pueyo

Rodríguez-Pintó²,

Serra‐Kiel³

et al. 2022

GeA

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“…In the South Pyrenean Zone, significant rotations both CW and CCW (40-60°) derived from proven primary paleomagnetic records from rocks of ages ranging from Permo-Triassic (e.g., Larrasoaña et al, 2003) to Oligocene (e.g., Sussman et al, 2004) are found in the most external cover units in relation to lateral ramps in thrust sheets. These rotations are especially evident nearby the boundaries of the so-called South Pyrenan Central Unit (e.g., Sussman et al, 2004;Mochales et al, 2012Mochales et al, , 2016Muñoz et al, 2013;Rodriguez-Pintó et al, 2016) but also in the most external thrust units (Pueyo et al, 2021a(Pueyo et al, , 2021b. Other moderate vertical axis rotations (15-25° CW and CCW, locally attaining ~40°) occur in the Permo-Mesozoic structural units immediately to the south of the Axial Zone: The Internal Sierras (Larra-Monte Perdido units; Oliva-Urcia and Pueyo, 2007aPueyo, , 2007bOliva-Urcia et al, 2008;Izquierdo-Llavall et al, 2015), the Nogueras thrust and underlying units McCaig, 1988, 1989;Dinarès et al, 1992;Oliva-Urcia et al, 2012;Izquierdo-Llavall et al, 2018) and in the eastern Cadi unit (Dinarès et al, 1992;Keller et al, 1994;Pueyo et al, 2016b).…”

Section: Paleomagnetism In the Pyreneesmentioning

confidence: 99%

Paleomagnetism from multi-orogenic terranes is "not a simple game": Pyrenees' Paleozoic warning

Pastor‐Galán¹,

Groenhof²,

Pueyo³

et al. 2021

Preprint

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Paleomagnetism is a versatile tool in the Earth sciences: it provides critical input to geological time scales and plate tectonic reconstructions. Despite its undeniable perks, paleomagnetism is not without complications. Remagnetizations overprinting the original magnetic signature of rocks are frequent, especially in orogens which tend to be the areas with better rock exposure. Unraveling the magnetic history of the rocks is a complicated task, especially in areas that underwent several orogenic pulses. In turn, constraining the timing of remagnetization represents an opportunity to solve post-magnetization structural and tectonic kinematics. Here, we evaluate the magnetization history of Silurian-Devonian carbonates from the Axial Zone of the Pyrenees. The Pyrenees are a multi-orogenic mountain belt where Silurian-Devonian rocks have seen the Variscan collision (late Paleozoic), the opening of the Atlantic / Bay of Biscay (early Cretaceous) and the Alpine orogeny (late Cretaceous to Miocene). Our results show widespread remagnetization(s) carried by magnetite and pyrrhotite in the Silurian-Devonian series of the Pyrenees. The majority of the samples show a post-folding but pre-alpine tilting magnetization. Considering the equatorial inclinations found in such samples, we suggest that they likely acquired their magnetization during the late Carboniferous and early Permian times. Two of the studied sites (located at the western Axial Zone) were subsequently remagnetized at the end of the Alpine orogeny. The paleomagnetic results constrained that the Variscan orogeny was responsible for the main folding event affecting Paleozoic rocks in the Axial Zone, whereas the Alpine orogeny produced the large-scale thrusting and antiformal stacking of these units. In addition, we observed a general clockwise rotational pattern which could be related with the formation of the Cantabrian Orocline and/or rotations associated with the Alpine orogeny. The Silurian-Devonian carbonates are thus useful to understand the tectonic evolution of the Pyrenean mountain range after a systematic combination of paleomagnetism with structural and petrological observations. In contrast, the secondary character of magnetization and complications associated with the Variscan tectonics indicate that a reassessment of Siluro-Devonian poles from the Variscan elsewhere in Europe might be appropriate.

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The Geometry and Kinematics of the Southwestern Termination of the Pyrenees: A Field Guide to the Santo Domingo Anticline

Cited by 2 publications

References 131 publications

The chronology and rotational kinematics in the South-Eastern Jaca Basin (Southern Pyrenees): Las Bellostas section

The chronology and rotational kinematics in the South-Eastern Jaca Basin (Southern Pyrenees): Las Bellostas section

Paleomagnetism from multi-orogenic terranes is "not a simple game": Pyrenees' Paleozoic warning

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