Subsidence and thermal history of an inverted Late Jurassic‐Early Cretaceous extensional basin (Cameros, North‐central Spain) affected by very low‐ to low‐grade metamorphism

Omodeo-Salé, Silvia; Salas, R.; Guimerà, Joan; Ondrak, Robert; Mas, Ramón; Arribas, José; Suárez‐Ruíz, Isabel; Martı́nez, Luis

doi:10.1111/bre.12142

Cited by 21 publications

(25 citation statements)

References 35 publications

(45 reference statements)

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“…However, temperatures probably exceed the ones corresponding to the maturity of organic matter during sedimentation of the Albian sandstones in this area (see reconstruction in according to a normal geothermal gradient (25 °C/km depth). These values are much lower than those obtained within the Cameros basin during the rifting stage and only comparable with its southern margin (Omodeo-Salé et al 2015). In this sense, frictional heating along the thrust surface must be invoked to explain the temperatures obtained.…”

Section: Interpretation and Discussioncontrasting

confidence: 53%

Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)

Sáinz

Román‐Berdiel

Oliva‐Urcia

et al. 2016

Int J Earth Sci (Geol Rundsch)

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Thrusting at shallow depths often precludes analysis by means of structural indicators effective in other geological contexts (e.g., mylonites, sheath folds, shear bands). In this paper, a combination of techniques (including structural analysis, magnetic methods, as anisotropy of magnetic susceptibility and paleomagnetism, and paleothermometry) is used to define thrusting conditions, deformation, and transport directions in the Cameros–Demanda thrust (North Spain). Three outcrops were analyzed along this intraplate, large-scale major structure having 150 km of outcropping length, 30 km of maximum horizontal displacement, and 5 km of vertical throw. Results obtained by means of the different techniques are compared with data derived from cross sections and stratigraphic analysis. Mixed-layer illite–smectite and vitrinite reflectance indicating deep diagenetic conditions and mature stage of hydrocarbon generation suggests shallow depths during deformation, thus confirming that the protolith for most of the fault rocks is the footwall of the main thrust. Kinematic indicators (foliation, S/C structures, and slickenside striations) indicate altogether a dominant NNW movement of the hanging wall in the western zone and NE in the eastern zone of the thrust, thus implying strain partitioning between different branches of the main thrust. The study of AMS in fault rocks (nearly 400 samples of fault gouge, breccia, and microbreccia) indicates that the strike of magnetic foliation is oblique to the transport direction and that the magnetic lineation parallelizes the projection of the transport direction onto the kmax/kint plane in sites with strong shear deformation. Paleomagnetism applied to fault rocks indicates the existence of remagnetizations linked to thrusting, in spite of the shallow depth for deformation, and a strong deformation or scattering of the magnetic remanence vectors in the fault zone. The application of the described techniques and consistency of results indicate that the proposed multidisciplinary approach is useful when dealing with thrusts at shallow crustal levels

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Section: Interpretation and Discussioncontrasting

confidence: 53%

Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)

Sáinz

Román‐Berdiel

Oliva‐Urcia

et al. 2016

Int J Earth Sci (Geol Rundsch)

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“…Cleavage and low‐grade metamorphism in the Cameros Basin have been documented by chloritoid formation, remagnetization (Casas et al, ; García‐Lasanta et al, ; Villalaín et al, ), thermal maturity of organic matter (Omodeo‐Salé et al, ), fluid inclusions (Mata et al, ), mineralogy (González‐Acebrón et al, ; Mata et al, ), and fission‐track data (Del Río, ; Rat et al, ). The absolute dating of the thermal metamorphic peak by 40 Ar/ 39 Ar dating of illite (Goldberg et al, ) and K‐Ar analysis of illite (Casquet et al, ) indicates an age ranging between 86 and 108 Ma.…”

Section: Discussionmentioning

confidence: 99%

Unraveling Multiple Thermotectonic Events Accommodated by Crustal‐Scale Faults in Northern Iberia, Spain: Insights From K‐Ar Dating of Clay Gouges

et al. 2019

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Large-scale faults in the continental crust are significant features that control the evolution of sedimentary basins and intraplate mountain chains. Deciphering their evolution is a significant task because faults slip and reactivate in a variety of geological settings. In this work, clay gouges of two major orogen-scale, long-lived faults in northern Iberia, the Río Grío and Vallès-Penedès Faults, were investigated by X-ray diffraction and K-Ar isotopic analysis. Illite polytype determinations of 44 subfractions (from <0.1 to 10 μm) allowed us to discriminate between authigenic/synkinematic illite crystals formed during faulting and detrital illite crystals inherited from the host rock. K-Ar dating provided a detailed set of ages corresponding to key stages of the thermotectonic evolution of the Iberian Plate: (a) the Permian to Late Triassic extensional/transtensional activity associated to the emplacement of Late Variscan magmatic bodies and hydrothermal mineralizations, (b) the opening of the Central Atlantic Rift during Late Triassic-Early Jurassic times, (c) the Late Jurassic-Early Cretaceous rifting that led to the development of Mesozoic extensional/transtensional basins in northern Iberia, (d) the final stage of the anticlockwise rotation of the Iberian Plate with respect to Eurasia and the accommodation of the first Pyrenean compressional pulses in Campanian time, and (e) the positive inversion of Mesozoic extensional basins due to far-field stresses associated with the Alpine orogeny during the Paleogene. The results highlight that thermotectonic conditions characterized by high-geothermal gradients strongly favor fault movement and neoformation of clay minerals in fault gouges, regardless of the prevailing tectonic regime.

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“…Based on fluid inclusions (Mata et al, ) and thermochronological data (Del Río, Barbero, & Stuart, ), a minimal metamorphic paleothermal gradient of ~70 °C/km has been measured for the metamorphic domain assuming a sediment thickness of 8 km. By contrast, based on subsidence data in the southern and northern Cameros basin, a lower paleogeothermal gradient of about 41.5 °C/km is derived from paleoheat flow value of 64 mW/m 2 obtained at the end of the postrift phase by Omodeo‐Salé et al (). They also infer based on 2‐D thermal modeling that the Cameros basin experienced low crustal thinning.…”

Section: Cameros Basinmentioning

confidence: 94%

“…The Cameros basin depositional sequences are characterized by sandstones, claystones, and limestones deposited in lacustrine, alluvial, and fluvial environments as well as coastal wet land with episodic marine incursions (Alonso & Mas, ; Guiraud & Seguret, ; Mas et al, ; Quijada et al, ; Suárez González et al, ). Sedimentation occurred during two successive synrift episodes of high subsidence rates from 151 to142 Ma (Tithonian–Early Berriasian) and during 129–109 Ma (Barremian–Early Aptian; Omodeo‐Salé et al, ). Synrift sediments are classically subdivided into five “Wealdian‐type” lithostratigraphic units comprising the Tera, Oncala, Urbion, Enciso, and Olivan Groups from bottom to top, respectively (Beuther, ; Tischer, ).…”

Section: Cameros Basinmentioning

confidence: 99%

“…At first order, the metamorphic domain is limited to the north of the Oncala anticline (Figure a). Inside this domain, peak temperatures and distribution of metamorphic zones are highly heterogeneous as reflected by vitrinite reflectance (VR), chlorite thermometry, thermochronological, and fluid inclusions data (Del Río, Barbero, & Stuart, ; Del Río, Barbero, Mata, & Fanning, ; González‐Acebrón et al, ; Omodeo‐Salé et al, , ). They can be defined by three NW‐SE oriented zones: the Yanguas‐Valdemadera zone, the Rabanera River zone, and the Pegado anticline zone (Figure a).…”

Section: Cameros Basinmentioning

confidence: 99%

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Tectonothermal Evolution of the Cameros Basin: Implications for Tectonics of North Iberia

et al. 2019

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Constraining the way in which continental deformation is accommodated in time and space is essential to reconcile past plate movements with geological observations. Kinematic reconstructions of the Iberia-Europe plate boundary are still debated. Here we focus on an inverted Mesozoic rift basin, the Cameros basin, which is part of the Iberian chain. We use a combination of detrital low-temperature thermochronological techniques to define the time-temperature evolution of the basin from Mesozoic rifting to Cenozoic collision. Zircon fission-track analyses of Oligocene-Miocene sedimentary rocks yield two main age populations at~170 ± 10 and~100 ± 10 Ma, reflecting (i) an Early Jurassic thermal event related to the Atlantic-Alpine Tethys opening and (ii) an Albo-Cenomanian thermal event related to the Bay of Biscay opening. Thermal modeling of combined zircon fission-track, apatite fission-track, and apatite (U-Th-Sm)/He data reveals that collision-related cooling of the Cameros basin started during the Paleocene (~60 Ma). A second cooling/exhumation phase of the basin is recorded from 35 to 25 Ma. Initial cooling occurred after a protracted postrift period characterized by persistence of high geothermal gradients, a feature also recognized in the Pyrenees. Our results show that the Iberian chain shared the same Early to Late Jurassic tectonothermal evolution with the Atlantic-Alpine Tethyan rifted margins. From the Albian onward, the thermal evolution of the Cameros basin was very similar to that of the Pyrenees. This study shows that the preservation in mountain ranges of a succession of rifting events provide important clues for plate reconstructions.

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Subsidence and thermal history of an inverted Late Jurassic‐Early Cretaceous extensional basin (Cameros, North‐central Spain) affected by very low‐ to low‐grade metamorphism

Cited by 21 publications

References 35 publications

Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)

Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)

Unraveling Multiple Thermotectonic Events Accommodated by Crustal‐Scale Faults in Northern Iberia, Spain: Insights From K‐Ar Dating of Clay Gouges

Tectonothermal Evolution of the Cameros Basin: Implications for Tectonics of North Iberia

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