3D reconstruction of syn-tectonic strata in a salt-related orogen: learnings from the Llert syncline (South-central Pyrenees)

Ramos, Adrià; López‐Mir, Berta; Wilson, Elisabeth P.; Granado, Pablo; Muñoz, J. A.

doi:10.1344/geologicaacta2020.18.20

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…In the South‐Central Pyrenees, the importance of Jurassic to Late Cretaceous salt tectonics has received increasing attention in recent investigations that unambiguously demonstrate the role of diapiric processes in constraining the Mesozoic tectono‐sedimentary evolution of the area, including those at: Cotiella (López‐Mir et al., 2015; McClay et al., 2004; Ramos et al., 2020), Sopeira and Sant Gervàs (Burrel, 2020; Gannaway Dalton et al., 2022; López‐Gómez et al., 2019; Muñoz et al., 2018; Saura et al., 2016), and Upper Pedraforca (Saura et al., 2016). This collection of relatively small basins, each containing several kilometres of salt‐controlled sediments, defines a diapiric domain, named as Diapiric Province in Southern Pyrenees (Saura et al., 2016) and Senterada Salt Province (Burrel, 2020; Burrel et al., 2021), that stretches at least 120 km parallel to the fold and thrust belt.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing the Iberian Salt‐Bearing Rifted Margin of the Southern Pyrenees: Insights From the Organyà Basin

et al. 2023

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Reinterpretation of the Organyà Basin, based on new detailed field observations and subsurface data, emphasizes the key contribution of Upper Triassic evaporites in the tectono‐sedimentary evolution of the South‐Central Pyrenees. Results are integrated in a 65‐km long restored cross‐section through the Serres Marginals, Montsec and eastern Organyà salt‐related depocenters. The reconstructed part of the Jurassic–Cretaceous northern Iberian salt‐rich rifted margin shows a template characterized by inherited Permo‐Triassic basement normal faults and an initial salt thickness of 0.7 km to the south and 1.5 km to the north. The Organyà Basin is part of the South Pyrenean Diapiric Province, a large system of salt related depocenters and minibasins, that is limited to the north by the more than 120‐km long Senterada salt wall complex separating the supra‐salt and sub‐salt domains in the Southern Pyrenees. Three main stages of diapiric activity are recognized along the northern Iberian margin from Asturias to the Eastern Pyrenees: a Jurassic early salt mobilization; a latest Jurassic–middle Albian main diapiric evolution associated with rifting; and a Campanian–Miocene diapiric reactivation during basin inversion that produced salt welds and thrust welds and translated the salt province some 60 km to the south.

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Section: Introductionmentioning

confidence: 99%

Reconstructing the Iberian Salt‐Bearing Rifted Margin of the Southern Pyrenees: Insights From the Organyà Basin

et al. 2023

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“…17a). The zone between the two syn-rift basins is defined by the development of a large postrift basin (the Cotiella basin system) and a series of oblique salt-detached anticlines, flanked by growth synclines filled by syncontractional turbidites (e.g., Garcia-Senz, 2002;Ramos et al, 2020). Very little of the San Juan basin is preserved as a result of erosion, but some salt is preserved in the contact with the Cotiella basin to the SW, which can be interpreted as a squeezed diapir that developed in the footwall of a former extensional fault (Fig.…”

Section: Isàbena Area South-central Pyrenees Spainmentioning

confidence: 99%

Inversion of transfer zones in salt-bearing extensional systems: insights from analogue modeling

Wilson

Granado

Santolaria

et al. 2023

Preprint

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Abstract. This work uses sandbox analogue models to analyze the formation and subsequent inversion of a decoupled extensional system comprised of two segmented half-grabens with thick early syn-rift salt. The segmented half grabens strike perpendicular to the direction of extension and subsequent shortening. Rifting created first a basement topography that was infilled by model salt, followed by a second phase of extension and sedimentation, followed afterwards by inversion. During the second phase of extension, syn-rift syncline minibasins developed above the basement extensional system and extended beyond the confines of the fault blocks. Sedimentary downbuilding and extension initiated the migration of model salt to the basement highs, forming salt anticlines, reactive diapirs, and salt walls perpendicular to the direction of extension, except for along the transfer zone where a slightly oblique salt anticline developed. Inversion resulted in decoupled cover and basement thrust systems. Thrusts in the cover system nucleated along squeezed salt structures and along primary welds. New primary welds developed where the cover sequence touched down on basement thrust tips due to uplift, salt extrusion, and syn-contractional downbuilding caused by loading of syn-contractional sedimentation. Model geometries reveal the control imposed by the basement configuration and distribution of salt in the development of a thrust front from the inversion of a salt-bearing extensional system. In 3D, the interaction of salt migrating from adjacent syn-rift basins can modify the expected salt structure geometry, which may in turn influence the location and style of thrust in the cover sequence upon inversion. Results are compared to the northern Lusitanian Basin, offshore Portugal and the Isàbena area of the South-Central Pyrenees, Spain.

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“…The Mesozoic sedimentary record in the area starts with the Late Triassic extension phase, which is represented in by a thick package of evaporites and shales with dolerite intrusions, the so-called Keuper Formation [36,37]. This salt unit is responsible for the diapirism and constitute the main detachment level for the thin-skinned deformation in the Basque-Cantabrian Basin and the Pyrenees [38][39][40][41][42]. A thick package of limestones, dolostones and marlstones was deposited on top of the evaporite unit as result of the regional sag-type subsidence after the first rifting phase [43][44][45].…”

Section: Geographical and Geological Settingmentioning

confidence: 99%

Discontinuities Characterization and Estimation of the Geological Strength Index by AI Tools on Flysch Materials

Garzón-Roca,

Torrijo,

Rodríguez-Peces

et al. 2023

Preprint

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This work studies the discontinuities features of sedimentary flysch materials in a 100 km2 area belonging to the Basque Arc. Such materials are common in this Spanish Alpine region located in the north of the Iberian Peninsula. A total of 33 outcrops are investigated by an intensive geotechnical investigation including geomechanical stations, boreholes and mechanical laboratory tests. Two flysch units are characterized: the Upper Aguinaga Formation or siliciclastic flysch, and the Lower Itziar Formation or calcareous flysch. Differences between both flysch formation are found. Joints in the siliciclastic flysch formation present an undulated roughness, with a spacing narrower and a persistence lower than in the calcareous flysch formation, which exhibits higher friction angles, although roughness is essentially planar. In addition, the potential of using Artificial Intelligence (AI) techniques, particularly Artificial Neural Networks and Support Vector Machine, to estimate the Geological Strength Index (GSI) from the Rock Quality Design (RQD) and some discontinuities features (spacing, persistence, aperture and roughness) is investigated. AI techniques are found to be satisfactory, being the Support Vector Machine with a linear kernel the technique which achieves the best performance.

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3D reconstruction of syn-tectonic strata in a salt-related orogen: learnings from the Llert syncline (South-central Pyrenees)

Cited by 7 publications

References 34 publications

Reconstructing the Iberian Salt‐Bearing Rifted Margin of the Southern Pyrenees: Insights From the Organyà Basin

Reconstructing the Iberian Salt‐Bearing Rifted Margin of the Southern Pyrenees: Insights From the Organyà Basin

Inversion of transfer zones in salt-bearing extensional systems: insights from analogue modeling

Discontinuities Characterization and Estimation of the Geological Strength Index by AI Tools on Flysch Materials

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