Subduction-related hybridization of the lithospheric mantle revealed by trace element and Sr-Nd-Pb isotopic data in composite xenoliths from Tallante (Betic Cordillera, Spain)

Avanzinelli, Riccardo; Bianchini, Gianluca; Tiepolo, Massimo; Jasim, Alia; Natali, Claudio; Braschi, Eleonora; Dallai, Luigi; Beccaluva, Luigi; Conticelli, Sandro

doi:10.1016/j.lithos.2019.105316

Cited by 13 publications

(28 citation statements)

References 68 publications

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“…Regarding to these samples, Conte et al (2016) argued that the high Sr isotopic composition was a characteristic of their mantle-derived parental melts and do not relate to crustal contamination during magma ascent toward the surface. This is supported by studies on mantle xenoliths from convergent setting (Avanzinelli et al, 2020;Bianchini et al, 2011;Dallai et al, 2019) that demonstrated how continental crust material can be recycled in the subcontinental mantle and how the partial melting of the resulted metasomatized mantle may produce primary melts with crustal-like initial 87 Sr/ 86 Sr ratios. Partial melting of such veined mantle is able to feed magmas having wide isotopic heterogeneities like that observed in the magmas of Central-Eastern Tyrrhenian and surroundings, being also strictly dependent on the peculiar mantle portion, that is, prevailing metasomatic veins or prevailing surrounding peridotite, that contributes to the melting.…”

Section: The Role Of Different Crustal Components In the Mantle Metasmentioning

confidence: 86%

“…The whole data set indicate that in the time span of ∼4.5 Ma to the present the area stretching from the WPI through the eastern margin of Tyrrhenian Sea experienced a HKCA/TR/KA magmatism with typical orogenic signatures and variable Sr‐Nd isotope compositions. The primitive magmas of TR series represented by the VR, found for the first time in this area originated by a similar mantle source of the HKCA counterparts (e.g., DWS andesites) likely at different depths and in response to small, local heterogeneities of the source resulting from the introduction of crustal materials components variously recycled in the mantle via subduction (Avanzinelli et al., 2020; Dallai et al., 2019; Mazzeo et al., 2014). These factors were able to produce magmas with slightly different Sr‐Nd isotope ratios, weak differences in the alkali compositions (slightly higher Na/K ratio) and volatile (i.e., H 2 O mainly) contents (Mazzeo et al., 2014; Perinelli et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…The trace element differences can be explained by the nature of sediments involved in the metasomatism of mantle wedge (Avanzinelli et al, 2009;D'Antonio & Di Girolamo, 1994;D'Antonio et al, 1999); this includes the addition of a U-and Ba-rich component deriving from carbonate-rich sediments that affects only the most recent products of the Neapolitan area, influencing the HFSE concentrations and preventing the Ba negative anomaly typical of these magmas (Avanzinelli et al, 2008(Avanzinelli et al, , 2018. Moreover, the variations in isotopic signatures can be referred to partial melting of mantle sources strongly metasomatized by crustal material variably recycled in the mantle wedge during subduction (e.g., Avanzinelli et al, 2009Avanzinelli et al, , 2020Bianchini et al, 2011;Conticelli et al, 2009b;Dallai et al, 2019;D'Antonio et al, 2007D'Antonio et al, , 2013Iovine et al, 2017Iovine et al, , 2018Mazzeo et al, 2014;Melluso et al, 2014). To this respect, of note is the extremely radiogenic Sr (and unradiogenic Nd) isotopic values shown by the DWS andesites, which significantly deviates from the range of the analogous products of HKCA/KA and TR series ( Figure 5).…”

Section: The Role Of Different Crustal Components In the Mantle Metasmentioning

confidence: 99%

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Tectonics, Dynamics, and Plio‐Pleistocene Magmatism in the Central Tyrrhenian Sea: Insights From the Submarine Transitional Basalts of the Ventotene Volcanic Ridge (Pontine Islands, Italy)

Conte

Perinelli

Bosman

et al. 2020

Geochem Geophys Geosyst

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In the last decades, several efforts have been made in geological research of marine areas, especially thanks to the increased availability of new exploration tools (e.g., high-resolution multibeam systems and high-resolution 3D-subsurface geophysics, etc.). However, since large seafloor sectors remain unexplored yet, detailed knowledge of volcanology, tectonic, and geodynamic processes can still be challenging. This is particularly relevant in areas controlled by complex geodynamic processes, such as arc/back-arc regions, especially where information on primary seafloor structures (e.g., seamounts, tectonic escarpments, etc.) are relatively scarce, as for the Mediterranean Sea. This is particularly true for the central Tyrrhenian Sea, which is the youngest (∼7 Ma) back-arc basin of the Western Mediterranean Sea (Gueguen et al., 1998). The Tyrrhenian back-arc basin hosts a complex distribution of magmatic products (Trua et al., 2011), which reflects the late-stage phase of geodynamic evolution of the Western Mediterranean Sea, displaying the geochemical features of magmas generated both from modified suprasubduction mantle sources (orogenic) and from upwellings of asthenospheric upper mantle (anorogenic) (Lustrino & Wilson, 2007). The geodynamic evolution of the Western Mediterranean Sea started about 30 Ma ago, in a general compressive tectonic regime related to the Eurasia-Africa convergence (e.g., Doglioni et al., 1999). It is characterized by multiple and variously directed subduction zones of oceanic lithosphere and slab roll-back, delamination/ detachment of subcontinental lithosphere, and development of complex lithospheric fault systems (e.g., Wilson & Bianchini, 1999). In different stages of this evolution, some back-arc basins formed (i.e., the Ligurian-Provençal and Tyrrhenian basins), leading to the migration of continental microplates (e.g., Balearic Islands and Sardinia-Corsica). The Tyrrhenian Sea back-arc basin originated by a diachronous spreading

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Section: The Role Of Different Crustal Components In the Mantle Metasmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: The Role Of Different Crustal Components In the Mantle Metasmentioning

confidence: 99%

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Tectonics, Dynamics, and Plio‐Pleistocene Magmatism in the Central Tyrrhenian Sea: Insights From the Submarine Transitional Basalts of the Ventotene Volcanic Ridge (Pontine Islands, Italy)

Conte

Perinelli

Bosman

et al. 2020

Geochem Geophys Geosyst

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“…Large zircon grains can crystallize from these melts within small dykes in the mantle (Upton et al, 1999;Pin et al, 2001 andSutherland et al, 2002). Despite such lithologies have rarely been identified in mantle xenoliths worldwide (Shimizu et al, 2004;Avanzinelli et al, 2020), minerals from these rocks could be scavenged by ascending magmas and carried up to the surface. In those situations, one can expect associated minerals to be transported along with the zircons.…”

Section: Important Modifications In the Mantle Beneath The French Masmentioning

confidence: 99%

Origin of zircon megacrysts in alkaline lavas (French Massif Central): Petrology and in situ U-Pb-Hf isotopes

Paquette

Chazot

Gannoun

2020

Journal of Volcanology and Geothermal Research

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In the south eastern Devès volcanic domain of the French Massif Central, we sampled red zircon megacrysts in, both, alluvium from a small stream and neighbouring mugearite lava. LA-ICP-MS U-Pb dating results yield similar ages for both suites of zircons at about 2.6 Ma. Superchondritic signatures of the Hf isotopes clearly indicate a depleted mantle source for these zircons. The mugearite lava also contains xenoliths of mantle (lherzolites) and lower crustal rocks (granulites). The chemical compositions of the minerals within the mugearite lava are 2 similar to the mineral compositions found in these xenoliths (granulites) and granulite and peridotite xenoliths from other volcanic localities of the Massif Central. The mugearite lava also preserves Variscan zircon crystals dated at 285 Ma, originating from recycled lower continental crust. In spite of their mantle origin, as recorded by in situ Hf isotopes, the geochemistry suggests that these Pliocene zircons do not result from crystallization in the mantle or in mantle-derived mafic magmas. In order to explain this inconsistency, we propose that these zircon grains crystallized from felsic melts produced during the ultimate differentiation of mantle-derived mafic magmas in the mid or upper continental crust. Subsequently, a last basaltic batch forced its way to the surface, scavenging upper mantle and lower crust xenoliths as well as zircon xenocrysts formed in these felsic melts which partly dissolved during their ascent. Large amounts of Cenozoic zircon megacrysts are often associated with sapphires in alluvial deposits in many continental volcanic domains, not only in the French Massif Central but also worldwide. Consequently, a huge volume of felsic differentiates issued from mantlederived basaltic magmas might be suspected in many alkaline volcanic domains at the global scale.

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“…McCulloch et al 1983;Nelson et al 1986;Nelson 1989Nelson , 1992Irving and Kuehner 1998;Turner et al 1999;Francalanci et al 2000;Conticelli et al 2007Conticelli et al , 2009Prelevićet al 2008Prelevićet al , 2010. Both within-plate and post-collisional lamproites are characterized by high δ 18 O (6-13‰; Taylor et al 1984;Barnekow et al 1998;Benito et al 1999;Barnekow 2000;Mirnejad and Bell 2006), a characteristic that, for post-orogenic ones, was argued to be related with recycled crustal-derived heavy oxygen within the mantle (Dallai et al 2019;Avanzinelli et al 2020).…”

mentioning

confidence: 99%

Petrogenesis of Mediterranean lamproites and associated rocks: The role of overprinted metasomatic events in the post-collisional lithospheric upper mantle

Casalini

Avanzinelli

Tommasini

et al. 2021

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High-MgO lamproite and lamproite-like (i.e., lamprophyric) ultrapotassic rocks are recurrent in the Mediterranean and surrounding regions. They are associated in space and time with ultrapotassic shoshonites and high-K calc-alkaline rocks. This magmatism is linked with the geodynamic evolution of the westernmost sector of the Alpine-Himalaya collisional margin, which followed the closure of the Tethys ocean. Subduction-related lamproites, lamprophyres, shoshonites and high-K calc-alkaline suites were emplaced in the Mediterranean region in the form of shallow level intrusions (e.g., plugs, dykes, and laccoliths), and small volume lava flows, with very subordinate pyroclastic rocks, starting from the Oligocene, in the Western Alps (Northern Italy), through the Late Miocene in Corsica (Southern France) and in Murcia-Almeria (South-Eastern Spain), to the Plio-Pleistocene in Southern Tuscany and Northern Latium (Central Italy), in the Balkan peninsula (Serbia and Macedonia), and in the Western Anatolia (Turkey). The ultrapotassic rocks are mostly lamprophyric, but olivine latitic lavas with a clear lamproitic affinity are also found, as well as dacitic to trachytic differentiated products. Lamproite-like rocks range from slightly silica under-saturated to silica over-saturated composition, have relatively low Al2O3, CaO, and Na2O contents, resulting in plagioclase-free parageneses, and consist of abundant K-feldspar, phlogopite, diopsidic clinopyroxene and highly forsteritic olivine. Leucite is generally absent and it is rarely found only in the groudmasses of Spanish lamproites. Mediterranean lamproites and associated rocks share an extreme enrichment in many incompatible trace elements and depletion in High Field Strength Elements and high, and positively correlated Th/La and Sm/La ratios. They have radiogenic Sr and unradiogenic Nd isotope compositions, high 207Pb over 206Pb and high time integrated 232Th/238U. Their composition requires an originally depleted lithospheric mantle source metasomatised by at least two different agents: i) a high Th/La and Sm/La (i.e., SALATHO) component deriving from lawsonite-bearing, ancient crustal domains likely hosted in mélanges formed during the diachronous collision of the northward drifting continental slivers from Gondwana; ii) a K-rich component derived from a recent subduction and recycling of siliciclastic sediments. These metasomatic melts produced a lithospheric mantle source characterised by network of felsic and phlogopite-rich veins, respectively. Geothermal readjustment during post-collisional events induced progressive melting of the different types of veins and the surrounding peridotite generating the entire compositional spectrum of the observed magmas. In this complex scenario, orogenic Mediterranean lamproites represent rocks that characterise areas that were affected by multiple Wilson cycles, as observed in the the Alpine-Himalayan realm.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5414418

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Subduction-related hybridization of the lithospheric mantle revealed by trace element and Sr-Nd-Pb isotopic data in composite xenoliths from Tallante (Betic Cordillera, Spain)

Cited by 13 publications

References 68 publications

Tectonics, Dynamics, and Plio‐Pleistocene Magmatism in the Central Tyrrhenian Sea: Insights From the Submarine Transitional Basalts of the Ventotene Volcanic Ridge (Pontine Islands, Italy)

Tectonics, Dynamics, and Plio‐Pleistocene Magmatism in the Central Tyrrhenian Sea: Insights From the Submarine Transitional Basalts of the Ventotene Volcanic Ridge (Pontine Islands, Italy)

Origin of zircon megacrysts in alkaline lavas (French Massif Central): Petrology and in situ U-Pb-Hf isotopes

Petrogenesis of Mediterranean lamproites and associated rocks: The role of overprinted metasomatic events in the post-collisional lithospheric upper mantle

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