The role of water in the petrogenesis of Mariana trough magmas

Stolper, Edward M.; Newman, Sally

doi:10.1016/0012-821x(94)90074-4

Cited by 707 publications

(486 citation statements)

References 112 publications

Supporting

Mentioning

448

Contrasting

Unclassified

Order By: Relevance

“…These models assume bulk addition of recycled components, rather than selective contamination as a result of processing within the subduction zone, because our understanding of how the composition of material returned to the mantle may differ from what is subducted is insufficient [cf. Stolper and Newman, 1994;Plank and Langmuir, 1998]. Recent work on volatiles on these samples, for example, suggests that a hydrous siliceous melt may be the phase in which recycled components were transferred to the segment 3 mantle source [Sherman, 1998].…”

Section: Resultsmentioning

confidence: 99%

Age constraints on crustal recycling to the mantle beneath the southern Chile Ridge: He‐Pb‐Sr‐Nd isotope systematics

Sturm¹,

Klein²,

Graham³

et al. 1999

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract. Basalts from the four southernmost segments of the subducting Chile Ridge (numbered 1-4 stepping away from the trench) display large variations in Sr, Nd, Pb, and He isotope and trace element compositions. Klein and Karsten [ 1995] showed that segments 1 and 3 display clear trace element evidence for recycled material in their source (e.g., low Ce/Pb). The uniformly midocean ridge basalt (MORB)-like 3He/4He and modest variations in Pb, Sr, and Nd isotopes of segment 1 (nearest the trench) suggest recent (<20 Ma) introduction of a contaminant into its source, consistent with recycling of matedhal from the adjacent subduction zone. In contrast, segment 3 lavas display a dramatic southward increase in enrichment, extending to highly radiogenic Pb and Sr isotopic compositions (e.g., 2ø6pb/2ø4pb = 19.5) and the lowest 3He/4He yet measured in MORB (3.5RA). The segment 3 variations are most readily explained by ancient (-2 Ga) recycling of terdhgenous sediment and altered crust, but we cannot rule out more recent recycling of matedhal derived from a distant continental source. The similarity in isotopic signatures of segment 4 lavas to Indian Ocean MORB extends the Dupal anomaly to the Chile Ridge. Like Indian Ocean MORB, the segment 4 isotopic variations are consistent with contamination by anciently recycled pelagic sediment and altered crust and require a complex history involving at least three stages of evolution and possibly a more recent enrichment event. Southern Chile Ridge MORB reflect the extensive degree of heterogeneity that is introduced into the depleted upper mantle by diverse processes associated with recycling. These heterogeneities occur on a scale of-50-100 km, corresponding to transform-and propagating-rift-bounded segmentation, and attest to the presence of distinct chemical domains in the mantle often bounded by surficial tectonic features that maintain their integrity on the scale sampled by melting.

show abstract

Section: Resultsmentioning

confidence: 99%

Age constraints on crustal recycling to the mantle beneath the southern Chile Ridge: He‐Pb‐Sr‐Nd isotope systematics

Sturm¹,

Klein²,

Graham³

et al. 1999

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…However, the major element variations in the Mariana trough samples are similar and so will be described by a single LLD. The modeled LLD begins with sample 80-1-3 from Stolper and Newman (1994) as the parental composition. This model crystallizes olivine isobarically at 1.5 kbar, then saturates plagioclase at 8.5 wt% MgO, then saturates clinopyroxene at approximately 6.1 wt% MgO, then saturates magnetite at 3.9 wt% MgO (Fig.…”

Section: Northern and Southern Mariana Troughmentioning

confidence: 99%

Variations in Fe3+/∑Fe of Mariana Arc Basalts and Mantle Wedge fO2

Brounce

Kelley

Cottrell

2014

Journal of Petrology

224

145

View full text Add to dashboard Cite

When collecting Fe-µ-XANES spectra on olivine-hosted melt inclusions, it is important to avoid hitting the olivine crystal with the beam during analysis. Olivine contains several weight percent of Fe 2+ and even a very small amount of olivine interference will "contaminate" the pre-edge structure of Fe-µ-XANES spectra collected for melt inclusions and bias the result towards more reduced values. The region of XANES spectra at higher energies than the Fe-Kα absorption edge contains information related to Fe-coordination and can be used to distinguish glass structure (random and on average, uncoordinated) from olivine signal (strong coordination, Fig. A1). All melt inclusion and seafloor glass spectra were visually inspected and compared to spectra taken on San Carlos olivine and standard glasses from Cottrell et al. (2009) in order to screen for crystal contamination. Any spectra demonstrating signs of spectral features similar to those observed in San Carlos olivine were not considered in this study and additional spectra were collected to accommodate for this elimination. Model liquid lines of descentTo constrain the effects of fractional crystallization on magmatic Fe 3+ /∑Fe ratios, model liquid lines of descent that match the observed major element variations were generated using PetroLog3 (Danyushevsky & Plechov, 2011). The mineral-melt models that most closely replicate the natural data were chosen for each location, resulting in some variation in the models used from volcano to volcano. Individual model parameters

show abstract

“…Although the Izu-Bonin rate is more than the global average of 94 km 3 /Ma/km it should be recognized that this arc would be expected to be more productive than many because of its thin lithospheric lid that allows significant upwelling under the arc and thus more melting compared to a mature continental arc characterized by thick crust (Plank and Langmuir, 1988). Alternatively, if melting in arcs is controlled by the supply of aqueous fluids to the mantle wedge (Tatsumi et al, 1983;Stolper and Newman, 1994) then the rapid rate of convergence of 90 mm/a in the Izu-Bonin (DeMets et al, 1990) would deliver more fluid and so favor higher than normal rates of magma production. Convergence rates of 75 mm/a in the Aleutians are relatively average, consistent with the average magmatic productivity.…”

Section: Tablementioning

confidence: 99%