Evolution of the Corsica–Sardinia Batholith and late-orogenic shearing of the Variscides

Casini, Leonardo; Cuccuru, Stefano; Puccini, Antonio; Oggiano, Giacomo; Rossi, P.

doi:10.1016/j.tecto.2015.01.017

Cited by 68 publications

(54 citation statements)

References 83 publications

(158 reference statements)

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“…Cretaceous ages that are compatible with the late-Variscan tectonics (Casini et al, 2015) or the 150 post-rift fission track data (Danišík et al, 2007) reported for the Corsica-Sardinia basement, 151 which is considered as the source of the BS and VF sandstones (Di Giulio, 1992). However, 152 partial resetting of the ZHe ages is likely to have occurred in the wall rocks and, particularly, 153 within the damage zone where the temperature inferred from XRD and fluid inclusion analyses 154 was higher.…”

Section: Is the Thermal Signal Related To Fault Motion? 145mentioning

confidence: 56%

Dating shallow thrusts with zircon (U-Th)/He thermochronometry—The shear heating connection

Maino¹,

Casini²,

Ceriani³

et al. 2015

Geology

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12New zircon (U-Th)/He (ZHe) ages from a shallow (<6-7 km) thrust fault zone and 13 surrounding wall rocks in the Helminthoid Flysch of the Ligurian Alps were measured to test the 14 applicability of the thermochronometer for dating the brittle or brittle-ductile faults. The ages are 15 integrated with X-ray diffraction analysis of clay minerals and fluid inclusion microthermometry 16 on vein-filling minerals to constrain the temperature conditions of the damage zone and the wall 17 rocks during thrusting. 18The wall rocks yield pre-depositional inherited ZHe ages (125.3±15 to 312. Thermal modeling of the fault zone suggests that the shear heating associated with the 25 fault motion is an efficient mechanism for generating temperature increases of 50-70° during a 26 displacement of 10-25 km in 2-10 Ma. Our results underscore the validity of ZHe technique for 27 dating brittle or brittle-ductile faults characterized by relatively high strain rate. 28

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Section: Is the Thermal Signal Related To Fault Motion? 145mentioning

confidence: 56%

Dating shallow thrusts with zircon (U-Th)/He thermochronometry—The shear heating connection

Maino¹,

Casini²,

Ceriani³

et al. 2015

Geology

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show abstract

“…3b and Table 1). The field arguments that constrain the models time window are 1) that exhumation initiated during convergence, most probably triggered by slab break-off around 345 Ma (causing U1 HMK magmatism, Casini et al, 2015), and 2) that 2D compression dominated over transpression until at least 315 Ma (U1 and U2a' granitoids).…”

Section: Spatial and Temporal Scales Considered By The Numerical Modementioning

confidence: 99%

“…The system cannot be seen as 2D anymore. From 300 Ma (phase D4), NS extension occurs, with emplacement of U3 alkaline plutons in EW tensile fracture orthogonal to the previous lateral flow, suggesting a progressive transition from orogenic thinning to Permian rifting (see Appendix A, Gattacceca et al, 2004;Casini et al, 2015).…”

Section: A Geodynamic Conceptual Scenario Based On Petrology and Metamentioning

confidence: 99%

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Crustal exhumation during ongoing compression in the Variscan Maures-Tanneron Massif, France-Geological and thermo-mechanical aspects

et al. 2018

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The Maures-Tanneron Massif (MTM), together with Corsica and Sardinia, represent the Southeastern branch of the huge European Variscan belt. A continuous evolution from continental collision to exhumation is described from ca. 350 Ma to ca. 320 Ma, based on an extended compilation of available geological and geochronogical data. This geological compilation is complemented with thermo-mechanical modelling that tests the conditions under which deep-seated HP units can melt and exhume massively during continued convergence. We simulate in two-dimensions the development of gravitational instabilities in a partially melting crust, depending on rheological layering and heat sources, and accounting for temperature dependent elasto-visco-plastic rheologies. In order to reproduce PT exhumation patterns in the MTM, over the appropriate time-scale (>20 My) and spatial extent (>100 km), a best fit was obtained with a convergence rate of 0.5 cm/yr and moderate diffusive surface processes. The contribution of radiogenic heating in the pre-stacked felsic crustal units is crucial. A lateral alternation with mafic units is also required in order to prevent lateral spreading of the orogen. A low viscosity partially molten crust (10² Pa.s, thus rather felsic) accompanies crustal exhumation in a decoupled mode from the deeper mantle. A shallow asthenosphere below the orogen (LAB at ~70 km depth, eg. shallow slab break-off) produces too warm and sudden exhumation as opposed to a competent mantle lithosphere (120 km depth LAB) that restrains it. The MTM witnesses the typical competition between far-field plate convergence and internal body forces, and our study pleads for a progressive evolution of transpression towards perpendicular extension from ca. 320 Ma.

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“…Three magmatic suites can be distinguished: (i) early Mg-K calc-alkaline monzo-diorites and monzonites, (ii) peraluminous calc-alkaline granodiorites and monzogranites with subordinate tholeiitic gabbros; and (iii) metaluminous calc-alkaline to calcic gabbros and alkaline volcanic complexes. The origin of these suites has been explained in terms of the mixing in different proportions of mantle-derived and lower crustal melts (Rossi and Cocherie, 1991;Casini et al, 2015). Several authors have grouped the plutons into syn-or late-tectonic gabbrotonalitic to gabbro-monzogranitic rocks and post-tectonic anatectic leucogranites (Bralia et al, 1981;Ghezzo and Orsini, 1982).…”

Section: Late Variscan Magmatismmentioning

confidence: 99%

Structure and tectonic setting of the SE Sardinia mafic dyke swarm. Insights for the stress state during magma emplacement in the upper crust

Martínez-Poza

Druguet

2016

Journal of Geodynamics

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Evolution of the Corsica–Sardinia Batholith and late-orogenic shearing of the Variscides

Cited by 68 publications

References 83 publications

Dating shallow thrusts with zircon (U-Th)/He thermochronometry—The shear heating connection

Dating shallow thrusts with zircon (U-Th)/He thermochronometry—The shear heating connection

Crustal exhumation during ongoing compression in the Variscan Maures-Tanneron Massif, France-Geological and thermo-mechanical aspects

Structure and tectonic setting of the SE Sardinia mafic dyke swarm. Insights for the stress state during magma emplacement in the upper crust

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