Seismic implications of mantle wedge plumes

Gerya, Taras; Connolly, J. A. D.; Yuen, David A.; Gorczyk, Weronika; Capel, Allison M.

doi:10.1016/j.pepi.2006.02.005

Cited by 197 publications

(121 citation statements)

References 62 publications

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“…Gerya et al 2006;Castro & Gerya 2008;Castro et al 2010;Marschall & Schumacher 2012). During a first stage, various types of subducted rocks (basalts, sediments, slices of continental crust) are transported along the subduction channel to the mantle wedge where they mix with peridotite to form hydrous mélanges at the slab-mantle interface.…”

Section: Physical Models Of Slab-mantle Wedge Interactionmentioning

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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Section: Physical Models Of Slab-mantle Wedge Interactionmentioning

confidence: 99%

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

Peccerillo

Frezzotti

2015

JGS

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“…[20] For this set of simulations on an island arc subduction we used 2-D numerical model ( Figure B1) with kinematically prescribed subducting plate and with either static Gerya and Yuen, 2003b] or dynamic [Gerya et al, 2006] hydration of the mantle wedge as described below. In this model oceanic crust consists of a relatively thin (1000 m) heterogeneous layer of marine sediments, an upper 2 km thick sequence of hydrothermally altered basalts (metabasalts), and a lower 5 km section composed largely of gabbroic rocks (Table B1).…”

Section: B2 Initial Configurationmentioning

confidence: 99%

“…Diapirs rise through the mantle wedge along trajectories determined by the balance between buoyancy forces and mantle flow [Stern, 2002;Manea et al, 2005]. It was determined that both positive and negative seismic velocity anomalies are associated with the plumes [Gerya et al, 2006]. Positive anomalies are prevalent close to the slab due to the lowered temperatures associated with regions of cold plume initiation.…”

Section: Introductionmentioning

confidence: 99%

“…However, existence of isolated isometric positive tomographic anomalies surrounded by negative anomalies was not explained. Therefore we explore Gerya and Yuen's [2003a] model extended by accounting for the dynamic behavior of slab dehydration and variation in density of subducted rocks [Gerya et al, 2006]. We calculate phase changes and rock properties for the model lithologies by Gibbs energy minimization [Connolly, 2005].…”

Section: Introductionmentioning

confidence: 99%

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Large‐scale rigid‐body rotation in the mantle wedge and its implications for seismic tomography

Gorczyk

Gerya

Connolly

et al. 2006

Geochem Geophys Geosyst

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[1] Using a combined finite difference and marker-in-cell technique, we performed two-dimensional coupled petrological-thermomechanical numerical simulations of intraoceanic subduction. The simulations indicate that parts of the mantle wedge can become trapped between rheologically weak, hydrated, and partially molten upwellings (cold plumes) and the subducting slab. The structures form at various depths and develop circular, elliptic, or irregular shapes. The combined effect of the tractions caused by upwelling and subduction causes these regions to rotate. Our simulations investigate the parameters controlling the occurrence and long-term stability of such rigid, rotating structures. Circular rotating structures like ''subduction wheels'' are characteristic of models with relatively young (20-30 Myr) slabs and intermediate (2-5 cm/yr) subduction rates. We propose that the development of such circular features may explain some of the isolated seismic velocity anomalies in the mantle wedge.

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“…All of the HMA also plot close to the subducted oceanic sediment-derived melt end member field. Recently, a number of studies suggest that subducting sediments may detach from the subducting plate and form diapirs, owning to their intrinsic buoyancy relative to the overlying mantle (Gerya et al, 2006;Currie et al, 2007;Castro and Gerya, 2008;Behn et al, 2011). The interactions between the diapiric sediments and mantle lithosphere would produce considerable felsic melts (Currie et al, 2007;Miller and Behn, 2012).…”

Section: Petrogenesismentioning

confidence: 99%

Petrogenesis of gold-mineralized magmatic rocks of the Taerbieke area, northwestern Tianshan (western China): Constraints from geochronology, geochemistry and Sr–Nd–Pb–Hf isotopic compositions

Tang

Wang

Wyman

et al. 2013

Journal of Asian Earth Sciences

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Seismic implications of mantle wedge plumes

Cited by 197 publications

References 62 publications

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

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

Large‐scale rigid‐body rotation in the mantle wedge and its implications for seismic tomography

Petrogenesis of gold-mineralized magmatic rocks of the Taerbieke area, northwestern Tianshan (western China): Constraints from geochronology, geochemistry and Sr–Nd–Pb–Hf isotopic compositions

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