The Tyrrhenian zone: a case of lithosphere extension control of intra-continental magmatism
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Heat mining from super-hot horizons of the Larderello geothermal field, Italy
2022, Renewable EnergyCitation Excerpt :By addressing the fundamental processes expected under the super-hot conditions of the roots of the Larderello geothermal field, our numerical approach can be applied elsewhere, under similar thermal conditions, to provide technical indicators for planning and operating EGS in the continental crust. The Larderello geothermal field is located in the inner part of the Northern Apennines mountainous chain (Central Italy), an area affected by post-collisional extensional tectonics and magmatism since Miocene [13–17]) (Fig. 1a). The geothermal anomaly is sustained by mass and heat fluxes from the mantle, as testified by the presence of widespread magmatic intrusions and high surface heat flux anomalies over the whole Tuscan geothermal district (e.g., Refs. [18,19]).
Strongly SiO<inf>2</inf>-undersaturated, CaO-rich kamafugitic Pleistocene magmatism in Central Italy (San Venanzo volcanic complex) and the role of shallow depth limestone assimilation
2020, Earth-Science ReviewsCitation Excerpt :Chain in the Umbria administrative region, central Italy (Fig. 1). It belongs to the ULUD (Umbria-Latium Ultra-alkaline District; Lavecchia and Stoppa, 1990), also known in literature as IUD (Intramontane Ultra-alkaline District; Lavecchia and Stoppa, 1996), IAV (Intra-Apennine Volcanics; Peccerillo, 1998) or IAP (Intra-Apennine Province; e.g., Peccerillo, 2017) which include other Pleistocene (Chibanian age, replacing the original Ionian age by IUGS in January 2020) small volcanic centres: Colle Fabbri and Polino (Umbria), Cupaello (Latium), Grotta del Cervo and Oricola-Camerata Nuova (Abruzzi; Fig. 1). The IAP acronym is here preferred because of the sporadic presence in this province of igneous rocks very poor in alkalis (e.g., Polino and Colle Fabbri; Melluso et al., 2003; Lustrino et al., 2019b), incompatible with the “ultra-alkaline” adjective.
Detecting CO<inf>2</inf> anomalies in a spring on Mt. Amiata volcano (Italy)
2017, Physics and Chemistry of the EarthCitation Excerpt :According to the seismic classification of the Tuscany Region (deliberation GRT 421 of 26/05/2014) the municipalities of Mt. Amiata are classified in seismic zone 2. Mt. Amiata, whose magmatic activity ceased about 0.3 M.y. ago (Marinelli et al., 1993; Serri et al., 1993; Peccerillo, 1999), belongs to the Tyrrhenian side of the northern Apennines that is characterized by extensional regime (Frepoli and Amato, 2000; Meletti and Valensise, 2004), high heat flow (Mongelli and Zito, 1991), asthenospheric upwelling and lithospheric thinning (La Vecchia and Stoppa, 1999). The whole zone is characterized by wide-spread but moderate seismicity (the maximum recorded magnitude has been 5.1 with epicentre in Piancastagnaio, 1919), with hypocenter depth lower of 15 km (Della Vedova et al., 1991).
The Archean kalsilite-nepheline syenites of the Awsard intrusive massif (Reguibat Shield, West African Craton, Morocco) and its relationship to the alkaline magmatism of Africa
2017, Journal of African Earth SciencesCitation Excerpt :The petrogenesis of such ultrapotassic rocks is mainly explained in terms of melting of crustal rocks; partial melting of metasomatized mantle and magma mixing processes. Such diversity is related to the variety of geotectonic settings even if all geodynamic interpretations of such potassic magmatism claim either a key role of subduction in mantle enrichment processes (e.g. Rogers et al., 1985; Serri et al., 1993) or consider them as an expression of continental rift magmatism (e.g.Lavecchia and Stoppa, 1990, 1996). Among all ultrapotassic intrusions cited worldwide, the widespread Cretaceous alkaline magmatism, the relationship between their formation the hot spot plumes and the Gondwana breakup is actually well constrained, owing to the increasing studies on REE-richs mineralisations associated to this kind of magmatism (example of Madagascar).
Paleoproterozoic potassic-ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
2007, Precambrian ResearchEarly orogenic normal faults and their reactivation during thrust belt evolution: the Gubbio Fault case study, Umbria-Marche Apennines (Italy)
2006, Journal of Structural GeologyCitation Excerpt :The Umbria-Marche Apennines are a fold- and thrust-belt, developed in the outer part of the Northern Apennines in response to NE-SW contraction active since Middle Miocene, where both late- and early-orogenic extension have been recognised in the hinterland and in the foreland regions, respectively. The late-orogenic extension presently affecting the hinterland region of the Apennines is widely accepted even if its origin is still a debated issue (e.g. see different interpretations in Carmignani and Kligfield, 1990; Lavecchia and Stoppa, 1990; Doglioni, 1995; Jolivet et al., 1998; Doglioni et al., 1999). Independently from the particular geodynamical model to explain extension in the hinterland region, it is a line of evidence that extension regularly follows the eastward migration of the contractional front (contraction-extension pair in Elter et al., 1975; Barchi et al., 1998a).