Radiogenic heat production variability of some common lithological groups and its significance to lithospheric thermal modeling

Abstract

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Structural map of Variscan northern Sardinia (Italy)

“…The Variscan belt of southern Europe includes several Late Mississippian to Early Permian magmatic provinces broadly related to post-collisional extension and thermal re-equilibration of the crust (Casini, Puccini, Cuccuru, Maino, & Oggiano, 2013;Gébelin, Roger, & Brunel, 2009;Vilà, Fernández, & Jiménez-Munt, 2010). Most Carboniferous plutons emplaced within lateorogenic strike-slip shear zones relate to the late Variscan phase of wrench tectonics (Matte, 2001).…”

“…This recognized structural control motivated geologists to improve their knowledge about the geometry and timing of different plutons in relation to major orogenic events. Work has included detailed structural maps of Variscan batholiths that have been coupled to high-resolution geochronological studies in the French Massif Central (Faure, Cocherie, Mézème, Charles, & Rossi, 2010;Gébelin et al, 2009), External Crystalline Massifs on the western Alps (Rubatto, Ferrando, Compagnoni, & Lombardo, 2010), the Pyrenean region (Liesa et al, 2011;Vilà et al, 2010) and the Corsica-Sardinia block (Casini, Cuccuru, Maino, Oggiano, & Tiepolo, 2012;Gattacceca et al, 2004;Gébelin et al, 2009;Rossi & Cocherie, 1991). However, recent work on the Sardinian part of the Corsica-Sardinia Batholith have focused on petrological aspects related to the origin of melts (Cruciani, Franceschelli, Jung, Puxeddu, & Utzeri, 2008;Ferré & Leake, 2001;Gaggero, Oggiano, Buzzi, Slejko, & Cortesogno, 2007;Macera, Di Pisa, & Gasperini, 2011).…”

Structure and nature of the Palaeozoic basement based on magnetic, gravimetric and seismic investigations in the central Upper Rhinegraben

“…The presence of oil reflects the high paleo temperatures associated with the respective oil generation window of the Illkirch-Graffenstaden-Eschau area, heat being necessary to oil production, in particular in the case of moderate depths of the mother rock. By comparison with operational geothermal sites located in the Upper Rhinegraben, some favourable geological conditions for the Illkirch-Graffenstaden area can be Tabaud et al (2014) b Ray et al (2007) c Wang et al (2016) d Guillou-Frottier et al (2013) e Forster and Forster (2000) f Correia (2015) g Vilà et al (2010) (Fig. 1b).…”

“…In addition, the contribution of the natural radioactivity of such volumes of granitoids to the heat flow is significant (Jolivet et al 1989;Baillieux et al 2014;Ielsch et al 2016). In Table 1 are listed the heat-production values of the granitoids of the northern Vosges or from the Soultz geothermal site as well as petrophysical data collected from Variscan rocks in Europe (Correia 2015;Forster and Forster 2000;Grecksch et al 2000;Guillou-Frottier et al 2013;Lexa et al 2011;Tabaud et al 2014;Vilà et al 2010). Due to high contents of uranium and thorium (Altherr et al 2000), the heat-production values of the granitoids are, respectively, 3.23 and 3.68 μW/m 3 for the southern granitoids of the Hohwald and Andlau.…”

“…The second and most prominent heat contribution is attributed to the composition of the upper crust, in particular to the elevated concentration of heat-producing elements (HPE) in Palaeozoic granitoids (Vilà et al 2010). Already in the 1970s, the magnetic surveys at the ground level of the graben between Strasbourg-Lahr and WissembourgBaden-Baden had shown a clear correlation of the magnetic anomalies with temperature anomalies in the Soultz and Eschau ridge areas (Edel et al 1980).…”