Evaluation of stresses in two geodynamically different areas: Stable foreland and extensional backarc

Dragoni, Michele; Doglioni, Carlo; Mongelli, Francesco Paolo; Zito, G.

doi:10.1007/bf00876496

Cited by 28 publications

(22 citation statements)

References 33 publications

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“…3) the x-axis along the extensional faults (NW-SE) and y-axis in its counterclockwise normal direction. We assume h L = 130 km, h c = 50 km, β = 3.2, δ = 2.3 (Calcagnile and Panza, 1981;Suhadolc and Panza, 1989;Nicolich, 1989), A 0 = 3 W m −3 and D = 8 km (Dragoni et al, 1998). The assumed thermal diffusivity and conductivity were derived from the laboratory measurements carried out by Zito et al (1993) on some deep rocks coming from the geothermal field of Travale (Tuscany).…”

Section: Application To the Extensional Tyrrhenian-tuscan Extensionalmentioning

confidence: 99%

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

Zito

2005

Journal of Geodynamics

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Section: Application To the Extensional Tyrrhenian-tuscan Extensionalmentioning

confidence: 99%

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

Zito

2005

Journal of Geodynamics

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“…It has been shown that this value generally characterizes the crust at least down to depths of 12 km (Zoback and Townend, 2001), although significant deviations have been described associated with seismicity in the Italian area (e.g., Di Luccio et al, 2010). The study area is divided into extensional, compressional and transcurrent subdomains on the basis of seismological and paleoseismological data (e.g., Dragoni et al, 1995;Galli et al, 2008;Meletti et al, 2008), stress data (Montone et al, 2012;Carafa and Barba, 2013) regional tectonic and paleogeographic considerations and the GPS data of Figs. 3 and 4.…”

Section: Brittle-ductile Transition (Bdt) and Differential Stressmentioning

confidence: 99%

Graviquakes in Italy

et al. 2015

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“…Besides, these authors discuss the Sardinia tectonic structure, the presence of fluids at depth and the occurrence of either hydrous-anhydrous mineral transitions, which can trigger seismicity (Quattrocchi 1999) or ductile layers, which may locally decrease seismicity in a regional active stress-field (Dragoni et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

et al. 2008

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The EC funded Geochemical Seismic Zonation program (EEC GSZ Project 1996-1998 chose Sardinia as a low-seismicity site, in which the relationships between fluid geochemistry and seismo-tectonics had to be investigated and results compared with outcomes from other selected high-seismicity sites. A first article, examining the role of fault segmentation and seismic quiescence on the geochemical composition of groundwaters and gases, has already been presented (Angelone et al. 2005). This article deals with environmental isotopes which, together with selected hydrochemical data, give hints on tectonically-related fluid circulations. Four water-dominated hydrothermal systems were considered, all located along regional fault systems and discharging groundwaters belonging to the Na-HCO 3 and Na-Cl facies. In the considered systems, groundwater circulation takes place, principally, in the Palaeozoic Crystalline Basement (PCB), with the exception of the Logudoro system, where hydrological circuits develop in the Mesozoic Carbonate Platform (MCP). The high CO 2 contents, the non-attainment of fluid-rock equilibrium and the large lithological variability prevent the construction of a unique hydrogeological-geochemical conceptual model. In this case, stable isotopes provide a useful tool to describe the origin of fluids and their subterranean movements. Stable isotopes of water, integrated with hydrochemical data, indicate that fluids are derived from three main end members. The dominant component is a relatively recent local meteoric water; the second one is marine water; and the third one is a fossil freshwater, depleted in heavy isotopes with respect to modern rains. The latter end member entered the aquifer system in the past, when climatic conditions were greatly different from today. At least two circulation systems can be recognised, namely a shallow cold system and a deep hydrothermal system, as well as two distinct hydrological processes: (1) gravity-controlled descent of cold water towards greater depths and (2) convection linked to a thermal gradient, causing deep fluids to rise up from the hydrothermal reservoir towards the surface. The highly variable d 13 C TDIC values suggest the presence of two distinct CO 2 sources, namely, a biogenic one and a thermogenic one. The relation between the isotopic compositions of CO 2 and He indicates an increased mantle signature in uprising CO 2 -rich fluids.

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Evaluation of stresses in two geodynamically different areas: Stable foreland and extensional backarc

Cited by 28 publications

References 33 publications

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

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

Graviquakes in Italy

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

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