Structural and Geophysical Characterization of the Western Termination of the South Pyrenean Triangle Zone

Santolaria, Pablo; Ayala, C.; Pueyo, Emilio L.; Rubio, Félix; Soto, Ruth; Calvín, Pablo; Luzón, Aránzazu; Rodríguez-Pintó, A.; Oliván, C.; Sáinz, Antonio María Casas

doi:10.1029/2019tc005891

Cited by 20 publications

(22 citation statements)

References 79 publications

(130 reference statements)

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“…Bulk density was measured using the double weighting method (standard UNE-EN 1936:2007, by weighing irregular samples weighting between 1000 and 2000 g in air and water (Archimedes principle). Taking into account these density values and previously published density data in the Pyrenees (Santolaria et al 2016(Santolaria et al , 2020, for the Cenozoic units), we divided the stratigraphic succession of the modelled cross sections into 13 geological units (see Table 1). Individual sample density values range from 1.93 g/cm 3 (Middle-Upper Triassic evaporites) to 3.03 g/ cm 3 (Devonian metamorphosed slates and limestones).…”

Section: Density Measurementsmentioning

confidence: 99%

“…Considering the density contrast between host rocks and granites in the basement and between evaporites and other sedimentary rocks in the cover along the Central Pyrenees, in this work we use a workflow that combines the construction of two geological cross sections and their corresponding gravimetric models (see also Santolaria et al 2016Santolaria et al , 2020Izquierdo-Llavall et al 2019). The aim of this work was to investigate the basement and cover architecture in the Central Pyrenees and to constrain the geometry at depth and the volumetric distribution of the Triassic evaporites and the La Maladeta batholith.…”

Section: Introductionmentioning

confidence: 99%

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Basement and cover architecture in the Central Pyrenees constrained by gravity data

Clariana

Soto

Ayala

et al. 2021

Int J Earth Sci (Geol Rundsch)

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A new gravity survey (1164 gravity stations and 180 samples for density analysis) combined with two new geological cross sections has been carried out in a sector of the Central Pyrenees in order to improve the characterization of basement and cover architecture. From North to South, the study area comprises the southern half of the Axial Zone and the northernmost part of the South-Pyrenean Zone. New gravity data were combined with previous existing databases to obtain the Bouguer and residual anomaly maps of the study area. The two cross sections, oriented NNE–SSW, were built from field data and previous surficial and subsurface data and cross the La Maladeta plutonic complex. The residual anomaly map shows values ranging from −18 to 16 mGal and anomalies mainly oriented N120E. The two 2.5D modelled cross sections show similar observed gravity curves coinciding with similar interpreted structural architecture. Data show a gravity high oriented N120E coinciding with the Orri basement thrust sheet and an important gravity depression, with the same orientation, coinciding with the leading edge at depth of the Rialp basement thrust sheet and interpreted as linked to a large subsurface accumulation of Triassic evaporites. The volume at depth of the La Maladeta and Arties granites has been constrained through gravity modelling. This work highlights that the combination of structural geology and gravity modelling can help to determine the structural architecture of an orogen and localize accumulations of evaporites at depth.

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Section: Density Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Basement and cover architecture in the Central Pyrenees constrained by gravity data

Clariana

Soto

Ayala

et al. 2021

Int J Earth Sci (Geol Rundsch)

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“…8f). Within the SCPU thrust units (and Basque-Cantabrian belt) Mesozoic cover and pre-orogenic salt structures suffered moderate to low shortening (Muñoz, 1992;Vergés, 1993;Caméra, 2017;Santolaria et al, 2020;Ramos et al, 2022;Figs. 5 and 8).…”

Section: Prowedge Geometry and Dynamicsmentioning

confidence: 99%

Evolution of a low convergence collisional orogen: a review of Pyrenean orogenesis

Ford

Masini

Vergés

et al. 2022

BSGF - Earth Sci. Bull.

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The Pyrenees is a collisional orogen built by inversion of an immature rift system during convergence of the Iberian and European plates from Late Cretaceous to late Cenozoic. The full mountain belt consists of the pro-foreland southern Pyrenees and the retro-foreland northern Pyrenees, where the inverted lower Cretaceous rift system is mainly preserved. Due to low overall convergence and absence of oceanic subduction, this orogen preserves one of the best geological records of early orogenesis, the transition from early convergence to main collision and the transition from collision to post-convergence. During these transitional periods major changes in orogen behavior reflect evolving lithospheric processes and tectonic drivers. Contributions by the OROGEN project have shed new light on these critical periods, on the evolution of the orogen as a whole, and in particular on the early convergence stage. By integrating results of OROGEN with those of other recent collaborative projects in the Pyrenean domain (e.g., PYRAMID, PYROPE, RGF-Pyrénées), this paper offers a synthesis of current knowledge and debate on the evolution of this immature orogen as recorded in the synorogenic basins and fold and thrust belts of both the upper European and lower Iberian plates. Expanding insight on the role of salt tectonics at local to regional scales is summarised and discussed. Uncertainties involved in data compilation across a whole orogen using different datasets are discussed, for example for deriving shortening values and distribution.

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“…In that sector, the South Pyrenean sole thrust displays a large-scale footwall ramp. The External Sierras front, to theSouth, displays complex geometric relationships among several imbricate thrust sheets (Anastasio and Holl, 2001;McElroy, 1990;Millán, 1996;Santolaria et al, 2020). The study area is located at the northern part of the Balzes-Boltaña thrust sheet (Millán, 1996) and there, the outcropping Eocene marine platform sediments show structural and stratigraphic continuity with the very thick overlying Campodarbe Fm.…”

Section: Introductionmentioning

confidence: 99%

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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Structural and Geophysical Characterization of the Western Termination of the South Pyrenean Triangle Zone

Cited by 20 publications

References 79 publications

Basement and cover architecture in the Central Pyrenees constrained by gravity data

Basement and cover architecture in the Central Pyrenees constrained by gravity data

Evolution of a low convergence collisional orogen: a review of Pyrenean orogenesis

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

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