Heat flow anomaly and lithospheric thinning of the Tuscan extensional back-arc basin (Italy)

Zito, G.

doi:10.1016/j.jog.2005.04.001

Cited by 6 publications

(5 citation statements)

References 41 publications

(49 reference statements)

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“…We observed a similar tempera-ture deviation in the Ligurian Basin, facilitated by the narrow dimension of the basin and the thick sedimentary layer. This temperature distribution is also similar to this one modeled by Zito [2005] for the Tuscan-Tyrrhenian basin. This thermal distribution shows that the lithosphere has not yet reattained its equilibrium thickness.…”

Section: Tc5011supporting

confidence: 84%

“…The methodology used in this study does not allow modeling the transient component of heat flux which is mainly controlled by the time of rifting and the stretching amount. However, Zito [2005] performed a 3‐D thermal modeling of small back‐arc basins, as Tyrrhenian basin, or the Liguria Sea. Because this type of basin limited in space cools more rapidly, he shows that for these basins, the evolution of temperature and heat flow, after 10 Ma is not drastic over a period of 4 Ma (max 10%).…”

Section: Temperature and Heat Flowmentioning

confidence: 99%

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Why is the Ligurian Basin (Mediterranean Sea) seismogenic? Thermomechanical modeling of a reactivated passive margin

et al. 2008

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Tectonics, v. 27, p. TC5011, 2008. http://dx.doi.org/10.1029/2007TC002232International audienceThe seismic activity of the Ligurian Basin, the northeastern termination of the western Mediterranean basin, is larger than in surrounding regions, even though recent geodetic studies attest that this area is subject to very low levels of deformation. This basin is an example of a type of passive margins that cannot be considered solely as inert sites of sedimentation and of progressive subsidence and that are reactivated in a compressive pattern; other examples include the Kwanza basin (Angola) and the Brazil margin. We investigated, by means of 2-D thermomechanical modeling, the structural and rheological heterogeneities that can lead to concentration of strain in this marginal basin. We deduced that the deformation of the basin is due to its particular geometric features, narrow and with a thick surrounding continental crust, related to its position at the southern termination of the Alps. This sharp transition, in terms of both geometry and rheological contrast, is a main factor in explaining the weakness of the margin. We discuss the importance of buoyancy forces versus tectonic forces, as well as thermal effects, on the observed reactivation. Influence of contrast in rheology between an oceanic-type crust and continental crust is also studied. Geodynamical implications are proposed for the region. The good agreement between the predicted localized deformation and the observed seismicity distribution should help improve seismic hazard assessment in the region

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Section: Tc5011supporting

confidence: 84%

Section: Temperature and Heat Flowmentioning

confidence: 99%

Why is the Ligurian Basin (Mediterranean Sea) seismogenic? Thermomechanical modeling of a reactivated passive margin

et al. 2008

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“…The 500°C isotherm, which roughly marks the brittle‐ductile transition within the crust [ Ranalli and Murphy , 1987], displays a similar behavior (cross sections B‐B′ and E‐E′ in Figures 4 and 5). This observation suggests that the different thickness of the seismogenic volume in the chain and in the foreland is due to differences between the thermal layering of the crust beneath the Apennines (Moho depth ∼25 km; heat flow = 60–140 mWm −2 ), and beneath the Adriatic foreland (Moho depth ∼35 km; heat flow <60 mWm −2 ) [ Zito , 2005].…”

Section: Discussionmentioning

confidence: 99%

Mantle wedge dynamics versus crustal seismicity in the Apennines (Italy)

Ventura

Cinti

Luccio

et al. 2007

Geochem Geophys Geosyst

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[1] In the Apennines subduction (Italy), earthquakes mainly occur within the overriding plate, along the chain axis. The events concentrate in the upper 15 km of the crust above the mantle wedge, and focal solutions indicate normal faulting. In the foreland, the seismogenic volume affects the upper 35 km of the crust. Focal solutions indicate prevailing reverse faulting in the northern foreland and strike-slip faulting in the southern one. The deepening of the seismogenic volume from the chain axis to the foreland follows the deepening of the Moho and isotherms. The seismicity above the mantle wedge is associated with uplift of the chain axial zone, volcanism, high CO 2 flux, and extension. The upward pushing of the asthenospheric mantle and the mantle-derived, CO 2 -rich fluids trapped within the crust below the chain axis causes this seismicity. All these features indicate that the axial zone of Apennines is affected by early rifting processes. In northern Italy, the widespread and deeper seismicity in the foreland reflects active accretion processes. In the southern foreland, the observed dextral strike-slip faulting and the lack of reverse focal solutions suggest that accretion processes are not active at present. In our interpretation of the Apennines subduction, the shallower seismicity of the overriding plate is due to the dynamics (uprising and eastward migration) of the asthenospheric wedge.Components: 5022 words, 5 figures.

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“…Case 2 represents a lithosphere extension with mafic underplating restricted to the A-type magmatic stage (Chen et al, 2000). All simulations are based on a two-layered doublecrustal lithosphere (Spear, 1993;Zito, 2005), and the physical parameters required for these simulations are listed in Table 6.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…The model is solved by the finite element method and meshed by 1-D linear elements. Sizes of these elements are regular 100 m in length, temperatures for the surface and the lithosphere-asthenosphere interface are set at 283 K and 1573 K (Huppert and Sparks, 1988;Zito, 2005), and the duration of the transient simulation is 45 Myr (115-70 Ma). The depth-temperature (P-T) relationships varying with time are shown in Fig.…”

Section: Numerical Simulationmentioning

confidence: 99%

Generation of Late Cretaceous silicic rocks in SE China: Age, major element and numerical simulation constraints

Chen

Lee

et al. 2008

Journal of Asian Earth Sciences

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Heat flow anomaly and lithospheric thinning of the Tuscan extensional back-arc basin (Italy)

Cited by 6 publications

References 41 publications

Why is the Ligurian Basin (Mediterranean Sea) seismogenic? Thermomechanical modeling of a reactivated passive margin

Why is the Ligurian Basin (Mediterranean Sea) seismogenic? Thermomechanical modeling of a reactivated passive margin

Mantle wedge dynamics versus crustal seismicity in the Apennines (Italy)

Generation of Late Cretaceous silicic rocks in SE China: Age, major element and numerical simulation constraints

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