New evidences about the deep structure of the lipari arc

Caputo, Michèle; Panza, G. F.; Postpischl, D.

doi:10.1016/0040-1951(72)90086-8

Cited by 80 publications

(23 citation statements)

References 13 publications

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“…The low dipping angle of the Hyblean foreland (Doglioni et al, 2001 and references therein) and the absence of deep seismicity beneath the Western Aeolian arc (Caputo et al, 1970;1972) suggest slab breakoff on the west of the Tindari-Letoianni fault. This implies detachment and foundering into the mantle of the Hyblean slab beneath the Etna volcanic zone.…”

Section: Aeolian Arc and Etna Co 2 Emissionmentioning

confidence: 99%

Carbonate metasomatism and CO2 lithosphere–asthenosphere degassing beneath the Western Mediterranean: An integrated model arising from petrological and geophysical data

2009

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We present an integrated petrological, geochemical, and geophysical model that offers an explanation for the present-day anomalously high non-volcanic deep (mantle derived) CO 2 emission in the Tyrrhenian region. We investigate how decarbonation or melting of carbonate-rich lithologies from a subducted lithosphere may affect the efficiency of carbon release in the lithosphere-asthenosphere system. We propose that melting of sediments and/or continental crust of the subducted Adriatic-Ionian (African) lithosphere at pressure greater than 4 GPa (130 km) may represent an efficient mean for carbon cycling into the upper mantle and into the exosphere in the Western Mediterranean area. Melting of carbonated lithologies, induced by the progressive rise of mantle temperatures behind the eastward retreating Adriatic-Ionian subducting plate, generates low fractions of carbonate-rich (hydrous-silicate) melts. Due to their low density and viscosity, such melts can migrate upward through the mantle, forming a carbonated partially molten CO 2 -rich mantle recorded by tomographic images in the depth range from 130 to 60 km. Upwelling in the mantle of carbonate-rich melts to depths less than 60 -70 km, induces massive outgassing of CO 2 . Buoyancy forces, probably favored by fluid overpressures, are able to allow migration of CO 2 from the mantle to the surface, through deep lithospheric faults, and its accumulation beneath the Moho and within the lower crust. The present model may also explain CO 2 enrichment of the Etna active volcano. Deep CO 2 cycling is tentatively quantified in terms of conservative carbon mantle flux in the investigated area. IntroductionThe role of Earth degassing in present-day global carbon budget and consequent climate effects has been focused chiefly on volcanic emissions (e.g. Gerlach, 1991a;Varekamp and Thomas, 1998, Kerrick, 2001). The non-volcanic 1 escape of CO 2 from the upper mantle, from crustal carbonate rocks, from hydrocarbon accumulations, and from geothermal fields is not considered in the budgets of natural release processes (cf. IPCC reports). However, the impact of these processes on atmospheric CO 2 budget is relevant if considered at the regional scale.Italy constitutes an extraordinary example of massive CO 2 subaerial fluxes in the Western Mediterranean region (e.g. Chiodini et al., 1999Chiodini et al., , 2004Rogie et al., 2000;Chiodini and Frondini 2001;Minissale, 2004). In Italy, CO 2 emissions occur both in those areas of young or active volcanism (e.g. the Tyrrhenian border of Central Italy; Fig. 1), and at zones in which there is no evidence of magmatic activity, such as Central and Southern Apennines (Fig. 1).Interactions between magmas and carbonate rocks at walls of magma chambers locally contribute CO 2 in some recent and active volcanic zones (e.g., Alban Hills, Mt. Ernici, Vesuvius;Federico and Peccerillo, 2002; Iacono Marziano et al., 2007a, b). However, the bulk of present-day soil degassing in Italy is a regional feature affecting both volcanic areas and z...

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Section: Aeolian Arc and Etna Co 2 Emissionmentioning

confidence: 99%

Carbonate metasomatism and CO2 lithosphere–asthenosphere degassing beneath the Western Mediterranean: An integrated model arising from petrological and geophysical data

2009

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“…In particular in the Apennines subduction, the several hundreds kilometers deep seismicity is concentrated in the southeastern Tyrrhenian sea ŽPeterschmitt, 1956;Caputo et al, 1970Caputo et al, , 1972Sel-. vaggi and Chiarabba, 1995 .…”

Section: Lithospheric Properties and Geometry Of Subduction Zonesmentioning

confidence: 99%

“…Gueguen et al, 1997 . The Apennines subduction Ž zone Caputo et al, 1970Caputo et al, , 1972Scandone, 1980;Rehault et al, 1984Rehault et al, , 1985Malinverno and Ryan, 1986;Royden et al, 1987;Kastens et al, 1988;Doglioni, 1991 , when considered as a whole with the northern Africa Maghrebides, has a length comparable with the arcs of the western Atlantic and western Pacific subduc-Ž . tion zones 1500-3000 km .…”

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confidence: 99%

Orogens and slabs vs. their direction of subduction

Doglioni

Harabaglia

Merlini

et al. 1999

Earth-Science Reviews

297

198

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“…deep shocks down to a depth of 450 km (Peterschmitt, 1956;Caputo et al, 1970Caputo et al, ,1972Ritsema, 1972Ritsema, ,1979Papazachos, 1973;Gasparini et al, 1982;Anderson and Jackson, 1987b), which can be linked to the active deformation of remnants of the subducted slab, which may be bended (Mantovani et al, 1985) and ruptured and detached (Ritsema, 1972;Giese and More& 1978;Spakman, 1988). The pattern of shallow seismicity in the back-arc region indicates that it is linked to a vertical collapse, governed by concentric and radial fault patterns (Wezel, 1985).…”

Section: Spatial Distributionmentioning

confidence: 99%

Neotectonic rotations in the Calabrian Arc; implications for a Pliocene-Recent geodynamic scenario for the Central Mediterranean

Dijk¹,

Scheepers²

1995

Earth-Science Reviews

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Recently, new data have been presented which imply that major block rotations took place in the Central Mediterranean during the Pleistocene, between 1.0 and 0.7 Ma. Kinematic solutions for the spatial and temporal distribution of rotational data in the Central Mediterranean such as oroclinal bending of the Calabrian Arc and rotation of the Adria Plate are being discussed. Phases of neotectonic rotations appear to be confined to distinct phases of contractions and compressive interplate stress. We present a model in which the middle Pleistocene rotations are caused by a distribution of deformation in the Central Mediterranean through strike-slip motions along a number of major shear zones which define a free boundary between the African and the Adria Plates. One of the main features is the Trans-Mediterranean Mobile Zone, which separates areas with opposite rotations. The timing of the rotations is compared to the evolution of volcanism, basin development, subsidence and uplift patterns, contractional tectonics and seismicity patterns. From this comparison we hypothesize that the Late Pliocene-Recent geodynamic evolution of the Central Mediterranean comprises the following three episodes: (1) A Late Pliocene arc migration episode shows drifting of the Calabrian block and spreading of the back-arc basin without the associated oroclinal rotations that were previously assumed in literature. (2) An Early Pleistocene contraction episode shows a gradual increase of compressive interplate stress, and culminates in a middle Pleistocene "stress release phase" which is associated with block rotations, transpressional tectonics and a rupturing of the subducted slab. (3) A Late Pleistocene-Recent restabilisation episode is characterized by rapid isostatic adjustments, with extensional collapse of the Apennine thrust-wedge and the Tyrrhenian back-arc area related to rebound of non-detached lithosphere remnants and sinking into the mantle of the detached slab.

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New evidences about the deep structure of the lipari arc

Cited by 80 publications

References 13 publications

Carbonate metasomatism and CO2 lithosphere–asthenosphere degassing beneath the Western Mediterranean: An integrated model arising from petrological and geophysical data

Carbonate metasomatism and CO2 lithosphere–asthenosphere degassing beneath the Western Mediterranean: An integrated model arising from petrological and geophysical data

Orogens and slabs vs. their direction of subduction

Neotectonic rotations in the Calabrian Arc; implications for a Pliocene-Recent geodynamic scenario for the Central Mediterranean

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