Combined 238U–230Th and 235U–231Pa constraints on the transport of slab-derived material beneath the Mariana Islands

Avanzinelli, Riccardo; Prytulak, Julie; Skora, Susanne; Heumann, A.; Koetsier, G.W.; Elliott, Tim

doi:10.1016/j.gca.2012.06.020

Cited by 49 publications

(44 citation statements)

References 115 publications

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“…These rocks were initially considered related to intraplate continental settings (e.g., Cundari, 1980), although potassium enrichment is considered an important characteristic of arc-related magmas (e.g., Cawthorn et al, 1981;De Astis et al, 2000;Francalanci et al, 2004Francalanci et al, , 2007Ninkovich and Hayes, 1972;Tommasini et al, 2007). Experimental geochemical studies have shown that silica-and potassium-rich magmas can originate at depth, from the recycling of sediments at depths within the upper mantle (e.g., Avanzinelli et al, 2012a;Elliott, 2003;Elliott et al, 1997;Plank andLangmuir, 1993, 1998;Skora and Blundy, 2010). Geochemical and isotopic studies have also shown that several potassic and ultrapotassic igneous rocks are related to the continental collision, which occurred after closure of the Tethys Ocean, with recycling of upper crust within the sub-continental lithospheric mantle wedge playing a major role (e.g., Conticelli and Peccerillo, 1992;Conticelli et al, 2002Conticelli et al, , 2007Cox et al, 1976;Duggen et al, 2005Duggen et al, , 2008Guo et al, 2006Guo et al, , 2013Peccerillo, 1985Peccerillo, , 1999Peccerillo et al, 1987;Prelević and Foley, 2007;Rogers et al, 1985Rogers et al, , 1987.…”

Section: Introductionmentioning

confidence: 99%

The role of carbon from recycled sediments in the origin of ultrapotassic igneous rocks in the Central Mediterranean

Conticelli

Avanzinelli

Ammannati

et al. 2015

Lithos

103

102

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The Central Mediterranean region is one of the most important areas on Earth for studying subduction-related potassic and ultrapotassic magmatism, derived from partial melting of the metasomatised lithospheric mantle wedge. In this region, leucite-free (i.e., lamproite) and leucite-bearing (i.e., kamafugite, leucitite, and plagioleucitite) ultrapotassic rocks closely occur, in a time-related progression, linked to the evolution of both the mantle source and the regional tectonic regime. Time- and space-related magmatism migration followed the roll-back of the subducting slab and the anticlockwise drift of the Italian Peninsula. Leucite-free silica-rich lamproites are restricted to the early stage of magmatism and are associated with ultrapotassic shoshonites and high-K calc-alkaline volcanic rocks. Leucite-bearing (i.e., Roman Province) rocks are erupted consistently later than lamproite-like and associated shoshonitic rocks, with post-leucititic volcanism occurring in the late stage of volcanic activity with eruption of alkali-basaltic to latitic and trachytic rocks, often after major caldera-forming events. Present-day ultrapotassic volcanism is restricted to the Neapolitan area. Central Mediterranean potassic and ultrapotassic rocks are extremely enriched in incompatible trace elements with variable fractionation of Ta, Nb, and Ti in comparison to Th and large ion lithophile elements (LILE). They are also variably enriched in radiogenic Sr and Pb and unradiogenic Nd. The main geochemical and isotopic signatures are consistent with sediment recycling within the mantle wedge via subduction. A twofold metasomatism, induced by the recycle of pelitic sediments and dehydration of lawsonite-bearing schists generates the early metasomatic events that enriched the mantle wedge from which leucite-free ultrapotassic rocks (i.e., lamproite) were generated. Recycling of carbonate-rich pelites played an important role in the shift to silica-undersaturated ultrapotassic rocks (kalsilite- and leucite-bearing) of the classic ‘Roman province’

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Section: Introductionmentioning

confidence: 99%

The role of carbon from recycled sediments in the origin of ultrapotassic igneous rocks in the Central Mediterranean

Conticelli

Avanzinelli

Ammannati

et al. 2015

Lithos

103

102

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“…Indeed incompatible trace element enrichment with fractionated HFSE with respect to LILE is a geochemical characteristic typical of the upper continental crust (e.g., Taylor and McLennan, 1985;Elliot et al, 1997;Plank and Langmuir, 1998;Plank, 2005;Conticelli et al, 2007Conticelli et al, , 2009aAvanzinelli et al, 2012b Nd of the entire set of studied samples (Fig. 7), with the strongest fractionation HFSE with respect to LILE (Fig 6a-6c) and normalised incompatible trace element patterns resembling those of GLOSS and Mediterranean potassic rocks (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 83%

Geochemistry, Sr–Nd–Pb isotopes and geochronology of amphibole- and mica-bearing lamprophyres in northwestern Iran: Implications for mantle wedge heterogeneity in a palaeo-subduction zone

Aghazadeh

Prelević

Badrzadeh

et al. 2015

Lithos

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Please cite this article as: Aghazadeh, Mehraj, Prelević, Dejan, Badrzadeh, Zahra, Braschi, Eleonora, van den Bogaard, Paul, Conticelli, Sandro, Geochemistry, Sr-NdPb isotopes and geochronology of amphibole-and mica-bearing lamprophyres in northwestern Iran: Implications for mantle wedge heterogeneity in a paleo-subduction zone, LITHOS (2015), doi: 10.1016/j.lithos.2015.01.001 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T Nd/ 144 Nd down to 0.512463 with a negative correlation, consistent with the trace element distribution related with an enriched mantle source modified after sediment recycling during subduction and continental collision. ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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“…Therefore, uranium-series disequilibria in young arc magmas should trace events that caused the respective parent/daughter elements in the uranium series isotope chain to fractionate. Dependent on the geochemical behaviour of the elements, however, uranium-series isotopes have been proposed to trace either release of slab fluids (Elliott et al 1997;Turner et al 1997;Sigmarsson et al 1998;Zellmer et al 2000) or the onset of slab and/or mantle melting (Avanzinelli et al 2012). Thus, the disequilibria detectable in arc magmas imply time spans between release of the slab component and eruption in the order of at most 10 4 -10 5 years (Elliott et al 1997), melt ascent rates of at least several metres per year and possibly multiple slab dehydration events within less than 1000 years prior to eruption .…”

Section: Timescales Of Melt Transfer From Slab and Mantle To Surfacementioning

confidence: 99%

“…For example, Pa is normally considered as fluid immobile (Elliott et al 1997;Bourdon et al 1999) and, therefore, 231 Pa excesses should be controlled by dynamic melting of the mantle (Turner et al 1996). However, Avanzinelli et al (2012) recently argued that a slab component probably includes significant amounts of Th and Pa and thus traces slab melt release at timescales of ,150 ka prior to eruption.…”

Section: Timescales Of Melt Transfer From Slab and Mantle To Surfacementioning

confidence: 99%

An introduction to orogenic andesites and crustal growth

Gómez-Tuena

Straub

Zellmer

2013

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This chapter provides an overview of the current state of research on orogenic andesites. While their importance as proxies to the evolution of the continental crust has long been recognized, andesite genesis has remained highly controversial with a broader consensus yet to be reached. The controversy is fuelled by the question of whether orogenic andesites are primary melts of slab and mantle materials, or instead derivative products of basaltic mantle melts that differentiate in the overlying crust. These hypotheses are addressed in three sections of the book devoted to slab-mantle processes, the complexities of melt differentiation at crustal levels, and models pertaining to arc crustal growth. We believe that cross-fertilization and discussion among seemingly opposite and irreconcilable hypotheses will smooth the pathway towards a holistic communal model of andesite petrogenesis.Among the terrestrial planets, an andesitic continental crust is unique to Earth. Representing only c.

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Combined 238U–230Th and 235U–231Pa constraints on the transport of slab-derived material beneath the Mariana Islands

Cited by 49 publications

References 115 publications

The role of carbon from recycled sediments in the origin of ultrapotassic igneous rocks in the Central Mediterranean

The role of carbon from recycled sediments in the origin of ultrapotassic igneous rocks in the Central Mediterranean

Geochemistry, Sr–Nd–Pb isotopes and geochronology of amphibole- and mica-bearing lamprophyres in northwestern Iran: Implications for mantle wedge heterogeneity in a palaeo-subduction zone

An introduction to orogenic andesites and crustal growth

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