The mean composition of ocean ridge basalts

Gale, A.; Dalton, C. A.; Langmuir, C. H.; Su, Yongjun; Schilling, Jean-Guy

doi:10.1002/ggge.20038

Cited by 140 publications

(343 citation statements)

References 20 publications

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“…The global database of MORB compositions I statistically interrogate for evidence of CMC is that compiled by Gale et al (2013), which has been carefully curated to mitigate the effects of inter-lab biases, duplicate analyses and off-axis samples. Removing duplicate analyses is particularly important when studying the length scales at which local geochemical patterns emerge from global systematics, because the presence of duplicates will artificially create chemical similarity between samples over short distances.…”

Section: The Datasetmentioning

confidence: 99%

“…Removing duplicate analyses is particularly important when studying the length scales at which local geochemical patterns emerge from global systematics, because the presence of duplicates will artificially create chemical similarity between samples over short distances. The Gale et al (2013) dataset has also been filtered for data quality based on canonical trace element ratios. Although this filtering, if too severe, could potentially remove some of the signal of mantle derived variability required to track magma mixing, subsequent analysis will show there is still abundant geochemical variability to track CMC.…”

Section: The Datasetmentioning

confidence: 99%

“…In this sense the results presented could be viewed as a conservative estimate of the significance of CMC in global MORB. From the Gale et al (2013) dataset I use 2120 samples with joint MgO, La, Ce, Nd, Sm, Zr, Y and Yb analyses that were erupted along non-back-arc spreading centres. The trace elements were chosen to, (1) span a range of compatibility and so exhibit different degrees of variability in mantle derived melts, and (2) maximise the number of available data.…”

Section: The Datasetmentioning

confidence: 99%

“…Although the ridge segmentation also occurs on a finer scale than used here, samples are grouped on a spatial scale that preserves a significant number of data. Ridge segments are drawn from the Gale et al (2013) catalogue. In (B), (E) and (H) regionally normalised Ce/Yb is plotted against the MgO content of the sample: in this projection the relative position of the data from each ridge segment is unchanged.…”

Section: Applying Spatial Normalisation To Identify Cmc In Global Datamentioning

confidence: 99%

“…Investigating the global operation of CMC using a similar segment scale normalisation to that used above can be achieved by taking the segment means and standard deviations calculated in Gale et al (2013) and applying those to the corresponding segment data using Eq. (2).…”

Section: Applying Spatial Normalisation To Identify Cmc In Global Datamentioning

confidence: 99%

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Geochemical variability in MORB controlled by concurrent mixing and crystallisation

Shorttle

2015

Earth and Planetary Science Letters

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Section: The Datasetmentioning

confidence: 99%

Section: The Datasetmentioning

confidence: 99%

Section: The Datasetmentioning

confidence: 99%

Section: Applying Spatial Normalisation To Identify Cmc In Global Datamentioning

confidence: 99%

Section: Applying Spatial Normalisation To Identify Cmc In Global Datamentioning

confidence: 99%

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Geochemical variability in MORB controlled by concurrent mixing and crystallisation

Shorttle

2015

Earth and Planetary Science Letters

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Evidence for a broadly distributed Samoan-plume signature in the northern Lau and North Fiji Basins

Price

Jackson

Blichert‐Toft

et al. 2014

Geochem. Geophys. Geosyst.

104

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Geochemical enrichment of lavas in the northern Lau Basin may reflect the influx of Samoanplume mantle into the region. We report major and trace element abundances and He-Sr-Nd-Hf-Pbisotopic measurements for 23 submarine volcanic glasses covering 10 locations in the northern Lau and North Fiji Basins, and for three samples from Wallis Island, which lies between Samoa and the Lau Basin. These data extend the western limit of geochemical observations in the Basins and improve the resolution of North-South variations in isotopic ratios. The Samoan hot spot track runs along the length of the northern trace of the Lau and North Fiji Basins. We find evidence for a Samoan-plume component in lavas as far West as South Pandora Ridge (SPR), North Fiji Basin. Isotopic signatures in SPR samples are similar to those found in Samoan Upolu shield lavas, but show a slight shift toward MORB-like compositions. We explain the origin of the enriched signatures by a model in which Samoan-plume material and ambient depleted mantle undergo decompression melting during upwelling after transiting from beneath the thick Pacific lithosphere to beneath the thin lithosphere in the northern Lau and North Fiji Basins. Other lavas found in the region with highly depleted isotopic signatures may represent isolated pockets of depleted mantle in the basins that evaded this enrichment process. We further find that mixing between the two components in our model, a variably degassed high-3 He/ 4He Samoan component and depleted MORB, can explain the diversity among geochemical data from the northern Lau Basin.

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Magmatic plumbing at Lucky Strike volcano based on olivine‐hosted melt inclusion compositions

Wanless

Shaw²,

Behn

et al. 2015

Geochem Geophys Geosyst

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Here we present volatile, major, and trace element concentrations of 64 olivine-hosted melt inclusions from the Lucky Strike segment on the mid-Atlantic ridge. Lucky Strike is one of two locations where a crustal melt lens has been seismically imaged on a slow-spreading ridge. Vapor-saturation pressures, calculated from CO 2 and H 2 O contents of Lucky Strike melt inclusions, range from approximately 300-3000 bars, corresponding to depths of 0.5-9.9 km below the seafloor. Approximately 50% of the melt inclusions record crystallization depths of 3-4 km, corresponding to the seismically imaged melt lens depth, while an additional 35% crystallize at depths > 4 km. This indicates that while crystallization is focused within the melt lens, significant crystallization also occurs in the lower crust and/or upper mantle. The melt inclusions span a range of major and trace element concentrations from normal to enriched basalts. Trace element ratios at all depths are heterogeneous, suggesting that melts are not efficiently homogenized in the mantle or crust, despite the presence of a melt lens. This is consistent with the transient nature of magma chambers proposed for slower-spreading ridges. To investigate the petrogenesis of the melt inclusion compositions, we compare the measured trace element compositions to theoretical melting calculations that consider variations in the melting geometry and heterogeneities in the mantle source. The full range of compositions can be produced by slight variations in the proportion of an Azores plume and depleted upper mantle components and changes in the total extent of melting.

show abstract

The mean composition of ocean ridge basalts

Cited by 140 publications

References 20 publications

Geochemical variability in MORB controlled by concurrent mixing and crystallisation

Geochemical variability in MORB controlled by concurrent mixing and crystallisation

Evidence for a broadly distributed Samoan-plume signature in the northern Lau and North Fiji Basins

Magmatic plumbing at Lucky Strike volcano based on olivine‐hosted melt inclusion compositions

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