Element transport from slab to volcanic front at the Mariana arc

Elliott, T.; Plank, Terry; Zindler, Alan; White, William M.; Bourdon, Bernard

doi:10.1029/97jb00788

Cited by 1,291 publications

(903 citation statements)

References 132 publications

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“…to the mantle wedge at the shallower depths (e.g., Gill, 1981;Kushiro, 1990;Plank and Langmuir, 1993;Elliott et al, 1997;Tatsumi and Kogiso, 1997) and that slab melts (if they occur) may be the metasomatic agents at greater depths (e.g., Beard et al, 1993;Rapp et al, 1999;Killian and Stern, 2002;Kelemen et al, 2004), perhaps producing more sodic metasomatic products. Portnyagin et al (2007) The experiments of Rapp et al (1999) and the geochemical and theoretical studies of Xiong et al (2006) suggest that fertile mantle, metasomatised by high-T melts, would consist of sodic amphibole pyroxenite, with phlogopite pyroxenite formed by interaction with lower-T melts.…”

Section: Origin Of the Crustal Component In The Mafic To Intermediatementioning

confidence: 99%

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Clemens

Darbyshire

Flinders

2009

Lithos

109

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The 425 Ma Arrochar and Garabal Hill-Glen Fyne complexes of highland Scotland are examples of post-orogenic magmatism accompanying extensional collapse of an orogen, in this case the Caledonian. The rocks are dominantly high-K series, but range from medium-K to shoshonitic. Mantle upwelling, melting and the intrusion of large volumes of mafic magma into the crust are inferred to have accompanied lithospheric thinning, and to have provided the heat source for melting of young arc crust accreted during the preceding subduction epoch.Fluids evolved from the subducting slab are inferred to have caused high degrees of enrichment in the overlying mantle wedge. Deep in the crust, the mantle-derived, K-rich mafic to intermediate magmas mixed with felsic crustal melts to form the spectrum of magmas intruded in the two complexes. Microgranular enclaves in the granitic rocks represent mafic magmas derived from the enriched mantle and hybridised by reaction, diffusion and mechanical mixing with their host felsic magmas, but they do not form part of the evolutionary series that produced the host magmas. Rather than inheriting its LILEenriched character directly from crustal melts, or from crustal assimilation by mafic magmas, the high-K series may commonly owe at least part of its potassic character to the involvement of mantle (highly metasomatised by slab-derived fluids) as a major magma source. Enclave suites, though prominent in some granitic rocks should not be assumed to represent magmas that played a significant role in the production of the chemical variations in their host magmas.

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Section: Origin Of the Crustal Component In The Mafic To Intermediatementioning

confidence: 99%

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Clemens

Darbyshire

Flinders

2009

Lithos

109

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“…14a). The combined Nd/Pb and Nb/Y ratios with isotope compositions can be used to effectively evaluate the nature of subduction components since Nd, Nb and Y are fluid-immobile and dominated by sediment-and slab-derived melt, whereas Pb contribution is mainly controlled by fluid composition (Elliott et al, 1997;Class et al, 2000;Petrone and Ferrari, 2008;Castillo et al, 2002Castillo et al, , 2007Wang et al, 2013). In Fig.…”

Section: Geochemical Characteristics and Petrogenesismentioning

confidence: 99%

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

226

121

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Keywords:Metabasic rocks MORB-and/or arc-like geochemical signatures Earliest Neoproterozoic Arc and back-arc system Eastern South China Block Periphery of Rodinia a b s t r a c t U-Pb geochronology along with elemental and Nd-Hf-Os isotopic data from the earliest Neoproterozoic metabasic rocks within the Cathaysia Block of the South China Block (SCB) constrain the tectonic setting and paleogeography of the block within the Rodinia supercontinent. The metabasic rocks give zircon U-Pb ages of 969-984 Ma, ε Hf (t) values of +1.8 to +15.3 and Hf model ages of 0.92-1.44 Ga. They are subalkaline basalts that can be geochemically classified into four groups. Group 1 has low Nb contents (1.24-4.33 ppm), highly positive ε Nd (t) values (+4.3 to +5.2), and REE and multi-elemental patterns similar to fore-arc MORB-type basalt. Group 2 has Nb contents ranging from 3.13 ppm to 6.48 ppm, ε Nd (t) of +3.1 to +6.2, low Re and Os contents and high initial Os isotopic ratios, and displays an E-MORB geochemical signature. Group 3 has Nb = 7.18-29.87 ppm, Nb/La = 0.60-1.40, Nb/U = 5.0-37, Ce/Pb = 1.1-6.6, ε Nd (t) = +2.9 to +7.0, 187 Re/ 188 Os = 5.87-8.87 and ␥Os (t) = 178-772, geochemically resembling to the Pickle Nb-enriched basalt. Group 4 has strong LREE/HREE and HREE fractionation and high ε Nd (t) values (+2.3 to +5.6), and is characterized by similar element patterns to arc volcanic rocks. Serpentinites coeval to Group 4 show 187 Os/ 188 Os of 0.1143-0.1442 and ␥Os (t) of −7.8 to +0.1. Groups 1 and 2 are interpreted to originate from the N-MORB and E-MORB-like sources with the addition of an arc-like component, genetically linked to fore-and back-arc settings, respectively. Groups 3 and 4 show inputs of newly subduction-derived melt and fluid in the wedge source. These geochronological and geochemical signatures fingerprint the development of an earliest Neoproterozoic (∼970 Ma) arc-back-arc system along the Wuyi-Yunkai domain of the Cathaysia Block. Regional relationships indicate that the Wuyi-Yunkai arc-back-arc system was one of a series of separate convergent margin settings, which included the Shuangxiwu (∼970-880 Ma) and Jiangnan (∼870-820 Ma) systems that developed in the SCB. The formation and closure of these arc-back-arc systems resulted in the northwestwardly episodic amalgamation of various pieces of the Yangtze and Cathaysia to finally form the SCB. These signatures require the SCB to occupy an exterior accretionary orogen along the periphery of Rodinia during 990-820 Ma, rather than to have formed through Mesoproterozoic Sibao orogenesis within the interior of Rodinia.

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“…(2) Efficient recycling of elements such as Th and Be from subducted sediments into arc magmas in most arcs worldwide is inferred from correlation of, e.g., Th/La with Pb and Nd isotope ratios in arc lavas [Class et al, 2000;Elliott et al, 1997;Hawkesworth et al, 1997], and from correlation of Th enrichment in arc lavas with the flux of subducted, sedimentary Th [Plank and Langmuir, 1998;Plank and Langmuir, 1993]. Because Th and Be are relatively insoluble in aqueous fluids, even under simulated subduction zone conditions, but are highly mobile incompatible elements during partial melting of both metasediments and metabasalt, it is argued that their efficient recycling requires melting of subducting sediment [e.g., Johnson and Plank, 1999;Brenan et al, 1995a;Brenan et al, 1995b;].…”

Section: Introductionmentioning

confidence: 99%

Thermal structure due to solid-state flow in the mantle wedge beneath arcs

Kelemen

Rilling

Parmentier

et al. 2003

Inside the Subduction Factory

191

177

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We summarize petrological and seismic constraints on the temperature of arc lower crust and shallow mantle, and show that published thermal models are inconsistent with these constraints. We then present thermal models incorporating temperature-dependent viscosity, using widely accepted values for activation energy and asthenospheric viscosity. These produce thin thermal boundary layers in the wedge corner, and an overall thermal structure that is consistent with other temperature constraints. Some of these models predict partial melting of subducted sediment and/or basalt, even though we did not incorporate the effect of shear heating We obtain these results for subduction of 50 Myr old oceanic crust at 60 km/Myr, and even for subduction of 80 Myr old crust at 80 km/Myr, suggesting that melting of subducted crust may not be not restricted to slow subduction of young oceanic crust.

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Element transport from slab to volcanic front at the Mariana arc

Cited by 1,291 publications

References 132 publications

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Thermal structure due to solid-state flow in the mantle wedge beneath arcs

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