http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29052

Dynamics of magma emplacement in centrifuge models of continental extension with implications for flank volcanism (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Dynamics of magma emplacement in centrifuge models of continental extension with implications for flank volcanism (Articolo in rivista) (literal)

Anno

2001-01-01T00:00:00+01:00 (literal)

Alternative label

Bonini M., Sokoutis D., Mugeleta G., Boccaletti M., Corti G., Innocenti F., Manetti P., Mazzarini F. (2001)
Dynamics of magma emplacement in centrifuge models of continental extension with implications for flank volcanism
in Tectonics (Washington, D.C.); AGU, American geophysical union, Washington, DC (Stati Uniti d'America)
(literal)

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Bonini M., Sokoutis D., Mugeleta G., Boccaletti M., Corti G., Innocenti F., Manetti P., Mazzarini F. (literal)

Pagina inizio

1053 (literal)

Pagina fine

1065 (literal)

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This work presents the results of a simulating continental area analogue modeling by using the centrifuge method. The major achievements are related to the migration of magma from central part of the rift towards the borders that are uplifted by the magma emplacement. This process consists in the formation of a series of volcanic edifices along the margins of the rift. By means of the analogue processes it has been explained a controversial problem on the formation of the presence of flank volcanism in rifting areas. This study has had a strong impact on the researchers dealing with the problematic related to rifting processes. Tectonics is an international journal that publishes only high-quality papers dealing with geodynamics at regional scale and is considered one of the most prestigious journals of structural geology. (literal)

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20 (literal)

Rivista

Tectonics (Rivista)

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Impact Factor 2.526 (literal)

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Experimental small-scale models of continental extension investigated the emplacement of orthogonal and oblique magma chambers, initially underplated at the base of the crust. The model represent crustal conditions analogous to continental rifts and consider both symmetric and asymmetric extension. The experimental results suggest that magma emplacement is controlled by the interactions between tectonics and rheology of the crustal layer. Extension is mainly accomodated by lateral flow and ductile doming in the viscous layer simulating the lower crust and by listric normal faults associated with a domal uplift. Stretching of the continental crust induces a migration of viscous layers into footwall of normal faults, where magma accumulation at the core of the domes takes place. This behaviour suggests that magmatism is localised in the footwall of major faults, a situation that is observed in core complex. The models simulate magma emplacement during extension of a brittle-ductile system, lateral flow and migration of magma may also provide a explanation for the occurrence of volcanoes on the plateaus flanking the rift. Such volcanoes are related to basaltic reservoirs, located at the base of the crust, to accomodate the space vacuated by lateral flow and thinning of the ductile crust. The similarity in structure of the models with natural examples of continental extension modes (such as rift systems and core complexes) may suggest a close similarity of dynamic processes (literal)

Note

Scopus (literal)
Google Scholar (literal)
ISI Web of Science (WOS) (literal)

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Bonini M. a), Sokoutis D. b), Mugeleta G. c), Boccaletti M. a), Corti G. a,d), Innocenti F. d), Manetti P. e), Mazzarini F. e) a) CNR-IGG, Sez.Firenze, via La Pira 4, Firenze b) Netherlands Center Integrated Solid Earth Sciences, Vrije Univ., De Boelelaan 1085, 1081 HV, Amsterdam c) Hans Remberg Tectonic Laboratory, Uppsala University, Sweden d) Dip.Scienze Terra, via S. Maria 53,Pisa e) CNR-IGG, via Moruzzi 1, Pisa (literal)

Titolo

Dynamics of magma emplacement in centrifuge models of continental extension with implications for flank volcanism (literal)

Abstract

A set of experimental small-scale models of continental extension investigated the emplacement of orthogonal and oblique magma chambers, initially underplated at the base of the crust. The models are driven by a centrifugal body force which simulates the role of gravity in nature. The model represent crustal conditions analogous to relatively mature continental rifts and consider both symmetric and asymmetric extension. The experimental results suggest that magma emplacement is controlled by the interactions between tectonics and rheology of the crustal layer. In particular, extension is mainly accomodated by lateral flow and ductile doming in the viscous layer simulating the lower crust and by listric normal faults, in the overlying brittle layer, associated with a ductile domal uplift. Stretching of the continental crust induces a \"reactive\" migration of viscous lalayers into footwall of major normal faults, where magma accumulation at the core of the domes takes place. This behaviour suggests that widespread magmatism is expected to localise in the footwall of major normal faults, a situation that is often observed in core complex structures. Although the models presented here are intended to simulate magma emplacement during extension of a two-mayer brittle-ductile system, lateral flow and migration of magma initially underplated at the base of the crust beneath narrow rift (e.g., the Ethiopian rift) may also provide a similar mechanism and a possible explanation for the occurrence of important volcanoes on the plateaus flanking the rift zones. In the suggested model, such volcanoes are related to large basaltic magma reservoirs, located at the base of the crust, to accomodate the space vacuated by lateral flow and thinning of the ductile crust. The similarity in structure of the models with natural examples of continental extension modes (such as rift systems and core complexes) may suggest a close similarity of dynamic processes. (literal)

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