The global chemical systematics of arc front stratovolcanoes: Evaluating the role of crustal processes

Turner, Scott S.; Langmuir, C. H.

doi:10.1016/j.epsl.2015.03.056

Cited by 145 publications

(114 citation statements)

References 33 publications

Supporting

Mentioning

109

Contrasting

Order By: Relevance

“…In order to further constrain the processes and fluxes operating in subduction zone settings, Turner and Langmuir [2015, hereafter referred to as TL2015a] provide a new, global database of major element, trace element, and Sr, Nd, Pb, and Hf isotopic compositions of arc front stratovolcanoes, normalized to constant MgO content or Mg#. That study confirms previously observed correlations among averaged, normalized major and trace element compositions of magmas erupted at volcanic fronts worldwide [Plank andLangmuir, 1988, 1993], and adds new first-order observations of the chemical systematics of arc front stratovolcanoes ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…This paper and TL2015a use arc average compositions that are normalized to a constant MgO and computed with a double averaging step, first determining individual volcano averages, and then averaging the Figure 1. (a-e) A subset of the correlations among major elements, trace elements, and trace element ratios presented in Turner and Langmuir (2015). ''6-values'' are calculated by averaging the compositions of samples that contain from 5.5 to 6.5 wt % MgO first for individual volcanoes, and then for arc segments.…”

Section: Introductionmentioning

confidence: 99%

“…The same systematics are present if averages are normalized to high Mg#, though high Mg# samples are not available at all arc segments. See Turner and Langmuir (2015) for a full discussion of the calculation and the first-order assessment of global systematics. Geochemistry, Geophysics, Geosystems 10.1002 volcanoes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

What processes control the chemical compositions of arc front stratovolcanoes?

Turner

Langmuir

2015

Geochem Geophys Geosyst

Self Cite

102

View full text Add to dashboard Cite

Arc front stratovolcanoes have global chemical systematics that constrain processes at convergent margins. Positive correlations exist for arc averages among ''fluid mobile,'' ''high field strength,'' and ''large ion lithophile'' elements. 143 Nd/ 144 Nd and 87 Sr/ 86 Sr from rear-arc lavas lacking subduction signature align with the oceanic ''mantle array,'' and correlate with arc front 143 Nd/ 144 Nd. Most chemical parameters (but not isotopes) also correlate well with crustal thickness and slightly less well with the slab thermal parameter, but not with the depth of the slab nor model slab surface temperatures. Successful models of arc volcanism should account for these global regularities. Two distinct models can quantitatively account for the observationsdifferent extents of melting of the mantle wedge caused by variations in wedge thermal structure, or varying contributions from the subducting slab owing to variations in the slab thermal structure. Both successful model scenarios require a significant flux of melted ocean crust to the mantle source of all volcanic arcs. The wedge melting model has constant contributions from ocean crust, sediment, and mantle wedge to lavas globally, while the slab model varies slab contributions with slab temperature. The wedge melting model fit improves by incorporating convergence rate and slab dip, which should affect the wedge thermal structure; the slab model is not supported by a similar analysis. The wedge model also more easily accommodates the isotope data. The two models predict different primary H 2 O contents, with large variations in H 2 O for the wedge model, and relatively constant H 2 O for the slab model. An evaluation of the effects of varying sediment compositions on arc lavas will benefit from considering the very different consequences of the two models.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

What processes control the chemical compositions of arc front stratovolcanoes?

Turner

Langmuir

2015

Geochem Geophys Geosyst

Self Cite

102

View full text Add to dashboard Cite

show abstract

“…Parental melt major and trace element compositions for Northern Type 1 and Northern Type 2 magmas were calculated by incrementally adding equilibrium olivine to the most isotopically depleted samples (Turner & Langmuir, 2015;Heinonen et al, 2016); with 25% olivine being added to Type 1 melts, and 43% olivine to Type 2 melts. These olivine fractions are within 2% of those calculated with the PRIMELT3 model (Herzberg & Asimow, 2015).…”

Section: Constraining the Parental Melt Compositions For The Franklinmentioning

confidence: 99%

“…The model suggests that the source of the Southern Natkusiak basalts may include an isotopically matured Munro-type komatiite component, and discounts major involvement of Abitibi-type basaltic andesite or Barberton-type komatiite. incrementally adding equilibrium olivine (Turner & Langmuir, 2015). The curves are marked at 5% intervals (small crosses).…”

Section: Implications For Origin and Evolution Of The Franklin Large mentioning

confidence: 99%

Geochemistry and origin of the Neoproterozoic Natkusiak Flood Basalts and related Franklin Sills, Victoria Island, Arctic Canada

Beard¹,

Scoates²,

Weis³

et al. 2018

Preprint

View full text Add to dashboard Cite

ABSTRACTlacked correspondingly high Lu/Hf. We suggest that the source region for the southwestern Natkusiak basalts and related sills included isotopically matured oceanic crust, which was recycled through the asthenospheric mantle into a laterally heterogeneous plume. The distinct trace element signatures of the southern and northern sources became attenuated with the onset of voluminous melting (corresponding to emplacement of the Type 2 doleritic sills and sheet flow basalts) and may reflect contributions from hydrous eclogitic material emplaced into the lithospheric mantle during the ca. 1.9 Ga Wopmay Orogeny. As both the northern and southern volcanic rocks exhibit contrasting isotopic signatures throughout the preserved stratigraphy, the magma plumbing system must have experienced limited lateral mixing and homogenisation, which allowed for the expression of distinct mantle source signatures in the high-level sills and basaltic lavas.

show abstract

Reconciling mantle wedge thermal structure with arc lava thermobarometric determinations in oceanic subduction zones

Perrin

Goes

Prytulak

et al. 2016

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Subduction zone mantle wedge temperatures impact plate interaction, melt generation, and chemical recycling. However, it has been challenging to reconcile geophysical and geochemical constraints on wedge thermal structure. Here we chemically determine the equilibration pressures and temperatures of primitive arc lavas from worldwide intraoceanic subduction zones and compare them to kinematically driven thermal wedge models. We find that equilibration pressures are typically located in the lithosphere, starting just below the Moho, and spanning a wide depth range of 25 km. Equilibration temperatures are high for these depths, averaging 13008C. We test for correlations with subduction parameters and find that equilibration pressures correlate with upper plate age, indicating overriding lithosphere thickness plays a role in magma equilibration. We suggest that most, if not all, thermobarometric pressure and temperature conditions reflect magmatic reequilibration at a mechanical boundary, rather than reflecting the conditions of major melt generation. The magma reequilibration conditions are difficult to reconcile, to a first order, with any of the conditions predicted by our dynamic models, with the exception of subduction zones with very young, thin upper plates. For most zones, a mechanism for substantially thinning the overriding plate is required. Most likely thinning is localized below the arc, as kinematic thinning above the wedge corner would lead to a hot fore arc, incompatible with fore-arc surface heat flow and seismic properties. Localized subarc thermal erosion is consistent with seismic imaging and exhumed arc structures. Furthermore, such thermal erosion can serve as a weakness zone and affect subsequent plate evolution.

show abstract

The global chemical systematics of arc front stratovolcanoes: Evaluating the role of crustal processes

Cited by 145 publications

References 33 publications

What processes control the chemical compositions of arc front stratovolcanoes?

What processes control the chemical compositions of arc front stratovolcanoes?

Geochemistry and origin of the Neoproterozoic Natkusiak Flood Basalts and related Franklin Sills, Victoria Island, Arctic Canada

Reconciling mantle wedge thermal structure with arc lava thermobarometric determinations in oceanic subduction zones

Contact Info

Product

Resources

About