A west-east geochemical and isotopic traverse along the volcanism of the Aeolian Island arc, southern Tyrrhenian Sea, Italy: Inferences on mantle source processes

Francalanci, L.; Avanzinelli, Riccardo; Tommasini, Simone; Heuman, Arnd

doi:10.1130/2007.2418(12)

Cited by 35 publications

(46 citation statements)

References 77 publications

(202 reference statements)

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“…Early volcanism is ~0.8 Ma old and is still active on both islands of Panarea and Stromboli. Rocks have a more radiogenic Sr-isotope signature (ranges from 0.70519 to 0.70757) (Francalanci et al, 2007) and show a rapid geochemical evolution from calc-alkaline (mainly basaltic andesite) to potassic-alkaline magmas (potassic trachybasalt and shoshonite).…”

Section: Geodynamic Magmatic and Structural Frameworkmentioning

confidence: 99%

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

et al. 2016

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The regional stress field in volcanic areas may be overprinted by that produced by magmatic activity, promoting volcanism and faulting. In particular, in strike-slip settings, the definition of the relationships between the regional stress field and magmatic activity remains elusive.To better understand these relationships, we collected stratigraphic, volcanic and structural field data along the strike-slip Central Aeolian arc (Italy): here the islands of Lipari and Vulcano separate the extensional portion of the arc (to the east) from the contractional one (to the west). We collected >500 measurements of faults, extension fractures and dikes at 40 sites. Most structures are NNE-SSW to NNW-SSE oriented, eastward dipping, and show almost pure dip-slip motion; consistent with an E-W extension direction, with minor dextral and sinistral shear. Our data highlight six eruptive periods during the last 55 ka, which allow considering both islands as a single magmatic system, in which tectonic and magmatic activity steadily migrated eastward and currently focus on a 10 km long x 2 km wide active segment. Faulting appears to mostly occur in temporal and spatial relation with magmatic events, supporting that most of the observable deformation derives from transient magmatic activity (shorter-term, days to months), rather than from steady longer-term regional tectonics (10 2 -10 4 years). More in general, the Central Aeolian case shows how magmatic activity may affect the structure and evolution of volcanic arcs, overprinting any strike-slip motion with magma-induced extension at the surface. Keypoints: Relation between strike-slip kinematics and magmatism at volcanic arcs  Two neighbour volcanic islands share a single magmatic system  Magmatic stress is dominant and generates transient faulting

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Section: Geodynamic Magmatic and Structural Frameworkmentioning

confidence: 99%

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

et al. 2016

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“…Discussion 9.1. Relationships between the cumulate, high-K ankaramites and associated mafic shoshonites Shoshonitic magmas are widespread in continental arc settings such as the Aeolian Volcanic Arc (Francalanci et al, 2007), the Eastern Rhodopes, Bulgaria (Marchev et al, 2004), the Tibetan Plateau (Turner et al, 1996), the Mexican Volcanic Belt (Blatter et al, 2001) and, more rarely, in back-arc settings or oceanic island arcs (e.g. Izu-BoninMariana arc; Sun and Stern, 2001).…”

Section: Diffusion Of Fe and Ca From The Melt Inclusions Into Olivinementioning

confidence: 99%

High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Marchev

Georgiev

Zajacz

et al. 2009

Lithos

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The Upper Cretaceous Yambol-Burgas region of the Eastern Srednogorie continental arc is characterized by unusually large volumes of mafic shoshonitic and ultra-K magmatism represented by high-Mg cumulitic rocks, and nepheline-normative ankaramites, absarokites and shoshonitic (high-alumina) basalts. The cumulitic rocks consist of phenocrysts of clinopyroxene and olivine ) with inclusions of spinel (Cr#75-78). Olivine high-Fo cores and clinopyroxene host glassy melt inclusions which have nephelinenormative compositions with ankaramitic CaO/Al 2 O 3 ratios (N 1), low SiO 2 (47.4-50.0 wt.%), high MgO (7.5-10.8 wt.%), high total alkalis and shoshonitic K 2 O/Na 2 O ratios (N1). Electron microprobe and LA-ICPMS analyses demonstrate that parental magma was a high-Ca primitive mantle melt. Melt inclusions from the less Fo 85 rim approach absarokite composition with CaO/Al 2 O 3 ratios b 1, lower MgO (5.2 wt.%), and higher total alkalis and K 2 O/Na 2 O ratio. The ankaramitic rocks are strongly porphyritic, composed of phenocrysts of altered olivine with spinel inclusions and large clinopyroxene. Their major and trace element compositions are similar to those of melt inclusions hosted in the high-Fo 91-90 cores and clinopyroxene of the cumulitic rock. The absarokites differ from the high-K ankaramites by slightly higher SiO 2 (50.6-52.7 wt.%), Al 2 O 3 and alkali-oxide contents, lower FeO and MgO and particularly low CaO/Al 2 O 3 (0.6-0.9) ratio. Compared to the absarokites, shoshonitic basalts have similar SiO 2 (50.2-52.8 wt.%) at lower MgO contents and CaO/Al 2 O 3 ratios (0.37-0.53). The presented extensive set of major and trace element data on melt inclusions and whole rocks, along with their main phenocryst compositions, is used to constrain the crystallization temperatures and pressures of the most primitive ankaramites. We suggest that ankaramite compositions are formed by melting of a garnet-free metasomatized mantle source rather than by melting of lower crustal cumulates. Numerical modelling demonstrates that the generation of absarokites and shoshonitic basalts is compatible with fractionation of olivine and clinopyroxene from ankaramitic magma. The high-Mg chemistry of cumulitic rocks is explained as the result of accumulation of these minerals.

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“…However, a wealth of studies carried out in recent decades agree that much of the compositional variability observed in the Italian volcanic rocks, especially in the mafic ones, is primary, and reflects extremely variable mantle sources and conditions of partial melting (e.g. Hawkesworth & Vollmer 1979;Rogers et al 1985;Ellam et al 1988;Beccaluva et al 1991;Francalanci et al 1993Francalanci et al , 2007Peccerillo 1999Peccerillo , 2005De Astis et al 2000;Conticelli et al 2009a;Carminati et al 2012). Understanding the reason for these complexities is of primary interest for the petrology and geochemistry of magmas and related mantle processes, not only in Italy but also in other converging plate settings.…”

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confidence: 99%

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

Peccerillo

Frezzotti

2015

JGS

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Abstract:The Plio-Quaternary magmatism in the Tyrrhenian Sea area exhibits wide compositional variations, which cover almost entirely those observed for volcanic rocks worldwide. Some volcanoes (Etna, Iblei, Sardinia, etc.) range from tholeiitic to Na-alkaline, and display elemental and isotope signatures typical of FOZO and EM-1 ocean-island basalts (OIB). Other volcanoes (Aeolian Arc, Italian peninsula) range from calc-alkaline-shoshonitic to K-alkaline, exhibit typical 'subduction-related' trace element signatures (low Ta-Nb, high Rb-Cs-LREE), and show a large range of radiogenic isotope ratios, from mantle-like in the Aeolian Arc to crustal-like in central Italy. Geochemical data suggest that OIB-type magmatism originated in lithosphere-asthenosphere sources that were unaffected by recent subduction. In contrast, subduction-related magmas come from mantle sources that underwent Eocene to present mixing with various amounts and types of subducted crustal components. Fluxing of the mantle wedge by water-rich fluids from a mid-ocean ridge basalt-type slab occurred in the southern Tyrrhenian Sea, whereas interaction between peridotite and various types of sediments occurred in central Italy. These contrasting styles of mantle contaminations relate to the nature (oceanic or continental) of the foreland, slab geometry and pre-metasomatic mantle compositions, which vary greatly along the Apennine arc and are the reason for the formation of the wide variety of orogenic magmas in Italy.

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A west-east geochemical and isotopic traverse along the volcanism of the Aeolian Island arc, southern Tyrrhenian Sea, Italy: Inferences on mantle source processes

Cited by 35 publications

References 77 publications

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

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