Southern Tyrrhenian Sea

Peccerillo, Angelo

doi:10.1007/978-3-319-42491-0_12

Cited by 3 publications

(4 citation statements)

References 81 publications

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“…4) show low velocities extend from 40 to 80 km depth, well within the estimated range for primary MORB production based on geochemical considerations 51 . We infer that the LVZ below the Vavilov basin feeds the Vavilov–Magnaghi shallow structures and may perhaps be the source of MORB- and OIB- type magmatic rocks found here 15,48 . Although the LVZ is a broad feature beneath the Tyrrhenian basin (see Profile E, Fig.…”

Section: Discussionmentioning

confidence: 67%

“…Volcanism of the Tyrrhenian basin and its margins shows large variations in time and space reflecting the complex tectonic history of the region. Igneous activities in the southern Tyrrhenian basin emplaced a wide variety of magmatic rocks spanning Mid-Ocean Ridge Basalts (MORB)-, Ocean Island Basalts (OIB)-, and Arc- type geochemical signatures 48 . This wide range of magmatism point to a variety of mantle sources and melting processes 48–50 .…”

Section: Discussionmentioning

confidence: 99%

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3D shear wave velocity model of the crust and uppermost mantle beneath the Tyrrhenian basin and margins

Manu‐Marfo

Aoudia

Pachhai

et al. 2019

Sci Rep

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The Tyrrhenian basin serves as a natural laboratory for back-arc basin studies in the Mediterranean region. Yet, little is known about the crust-uppermost mantle structure beneath the basin and its margins. Here, we present a new 3D shear-wave velocity model and Moho topography map for the Tyrrhenian basin and its margins using ambient noise cross-correlations. We apply a self-parameterized Bayesian inversion of Rayleigh group and phase velocity dispersions to estimate the lateral variation of shear velocity and its uncertainty as a function of depth (down to 100 km). Results reveal the presence of a broad low velocity zone between 40 and 80 km depth affecting much of the Tyrrhenian basin’s uppermost mantle structure and its extension mimics the paleogeographic reconstruction of the Calabrian arc in time. We interpret the low-velocity structure as the possible source of Mid-Ocean Ridge Basalts- and Ocean Island Basalts- type magmatic rocks found in the southern Tyrrhenian basin. At crustal depths, our results support an exhumed mantle basement rather than an oceanic basement below the Vavilov basin. The 3D crust-uppermost mantle structure supports a present-day geodynamics with a predominant Africa-Eurasia convergence.

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

3D shear wave velocity model of the crust and uppermost mantle beneath the Tyrrhenian basin and margins

Manu‐Marfo

Aoudia

Pachhai

et al. 2019

Sci Rep

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“…Ocean‐drilling campaigns (Barberi et al., 1978; Bonatti et al., 1990; Dietrich et al., 1978) indicate the presence of a variety of volcanic rocks of mantle origin with different petrological characteristics, ranging from mid‐oceanic ridge to ocean‐island and arc‐type basalts. Such heterogeneity has been explained by a complex interplay of melting and mantle contamination processes, rooted in the peculiar evolution of this extensional basin (Peccerillo, 2017).…”

Section: Resultsmentioning

confidence: 99%

Surface‐Wave Tomography of the Central‐Western Mediterranean: New Insights Into the Liguro‐Provençal and Tyrrhenian Basins

et al. 2022

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The complex tectonic setting of the central‐western Mediterranean has interested geoscientists for decades, but its geodynamic evolution remains a matter of debate. We rely on 807 seismometers from southern Europe and northern Africa to measure Rayleigh and Love phase velocities in the period range ∼5–200 s, based on teleseismic earthquakes and seismic ambient noise. By nonlinear joint inversion of the phase‐velocity maps, we obtain a 3‐D shear‐wave velocity (VS) model of the study area. At shallow depths, our model correlates with surface geology and reveals the presence of a sedimentary cover in the Liguro‐Provençal basin, as opposed to the Tyrrhenian basin where this is either very thin or absent. At ∼5‐km depth, high velocities below the Magnaghi, Vavilov, and Marsili seamounts point to an exhumed, scarcely serpentinized mantle. These are replaced by lower velocities at larger depths, likely connected to the presence of partial melt. At 50–60‐km depth, a very heterogeneous structure characterizes the Tyrrhenian basin, with low velocities pointing to the presence of fluids due to the lateral mantle inflow from the Ionian slab edges, and higher velocities associated with a relatively dry upper mantle. Such heterogeneity disappears at depths ≳75 km, replaced by more uniform velocities which are ∼2% lower than those found in the Liguro‐Provençal basin. We infer that, at the same depths, the Tyrrhenian basin is characterized by a larger concentration of fluids and possibly higher temperatures.

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“…Due to the contiguity of the BASC to the volcanic arc and subducting plate, arc‐like lavas have been consistently and predominantly erupted during the Marsili volcanic activity, although the eruptive products record a progressive geochemical gradation to a more alkaline intraplate affinity (Trua et al, ). This geochemical variation records the effect of asthenospheric mantle flow into the ambient mantle wedge, induced by the lateral tearing of the narrow subducting Ionian slab (Gvirtzman & Nur, ; Marani & Trua, ; Peccerillo, ). Petrological constraints suggest that the increase in the melt supply produced by the asthenospheric mantle flow further favored the vertical accretion of the Marsili volcano (Trua et al, ).…”

Section: Geological Setting and Backgroundmentioning

confidence: 99%

Magma Plumbing System at a Young Back‐Arc Spreading Center: The Marsili Volcano, Southern Tyrrhenian Sea

Trua¹,

Marani

Gamberi

2018

Geochem Geophys Geosyst

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Although spreading rate is commonly taken as a proxy for decompression mantle melting at mid‐ocean ridges (MORs), magmatism at back‐arc spreading centers (BASCs) is further influenced by the subduction‐related flux melting of the mantle. These regions consequently show a diversity of crustal structures, lava compositions, and morphologies not typically found in MORs. Here we investigate the crustal plumbing system of the small‐scale, Marsili back‐arc spreading center of the Southern Tyrrhenian Sea using plagioclase data from a wide spectrum of lavas (basalts to andesites) dredged from its summit and flanks. We employ petrological modeling to identify the plagioclase populations carried in the individual lavas, allocate them to plausible magmatic components present within the plumbing system, and trace the processes occurring during magma ascent to the surface. The properties of the system, such as mush porosity and abundance of the melt bodies, vary from one magma extraction zone to another along the BASC, evidencing the local variability of melt supply conditions. The plagioclase crystals document a range of relationships with the host lavas, indicating magma extraction from a composite, vertically extensive mush and melt‐lens system resembling that of MORs. At the same time, however, in small BASCs, such as in the case of the Marsili Basin, crustal accretion and resulting morphology are significantly influenced by the three‐dimensional setting of the basin margins. This is an important deviation from the conventional model based on the linear continuity and essentially two‐dimensional framework of MORs.

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Southern Tyrrhenian Sea

Cited by 3 publications

References 81 publications

3D shear wave velocity model of the crust and uppermost mantle beneath the Tyrrhenian basin and margins

3D shear wave velocity model of the crust and uppermost mantle beneath the Tyrrhenian basin and margins

Surface‐Wave Tomography of the Central‐Western Mediterranean: New Insights Into the Liguro‐Provençal and Tyrrhenian Basins

Magma Plumbing System at a Young Back‐Arc Spreading Center: The Marsili Volcano, Southern Tyrrhenian Sea

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