Oxygen isotope composition of mantle peridotite

Mattey, D. P.; Lowry, David; Macpherson, Colin G.

doi:10.1016/0012-821x(94)90147-3

Cited by 644 publications

(355 citation statements)

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“…Oxygen isotope ratios in olivine phenocrysts (δ 18 O ol ) vary between +3.51 and +5.08‰. The olivine values are lower than those typically observed for MORB [33], ocean islands [36,37], arc volcanics [38] and mantle peridotites [39]. Results are similar to or lower than values reported for the Reykjanes Peninsula and Theistareykir [20,40,41].…”

Section: O Isotope Resultsmentioning

confidence: 46%

“…Unfortunately, there is insufficient oxygen isotopic variation in the present suite of glasses to construct meaningful models of this process (c.f. [5]), but simple mass balance calculations can be performed to predict the isotopic composition and quantity of recycled crust that must be added to typical upper mantle (δ 18 O = +5.5‰ [39]) to produce a source with δ 18 O of +4‰. Figure 7 demonstrates that ~ 40% recycled crust with δ 18 O of +2‰, at the lower end of variation recognised in ophiolites or ocean floor drill holes, is required to produce a mixture with δ 18 O of +4‰ [57,58].…”

Section: Oxygen Isotope Heterogeneity Of Icelandic Mantlementioning

confidence: 99%

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High-3He/4He, depleted mantle and low-δ18O, recycled oceanic lithosphere in the source of central Iceland magmatism

Macpherson

Hilton

Day

et al. 2005

Earth and Planetary Science Letters

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'High-3He/4He, depleted mantle and low-18O, recycled oceanic lithosphere in the source of central Iceland magmatism.', Earth and planetary science letters., 233 (3-4). pp. 411-427. Further information on publisher's website:http://dx.doi.org/10. 1016/j.epsl.2005.02.037 Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Section: O Isotope Resultsmentioning

confidence: 46%

Section: Oxygen Isotope Heterogeneity Of Icelandic Mantlementioning

confidence: 99%

High-3He/4He, depleted mantle and low-δ18O, recycled oceanic lithosphere in the source of central Iceland magmatism

Macpherson

Hilton

Day

et al. 2005

Earth and Planetary Science Letters

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“…Variations in oxygen isotopes in the mantle source are ultimately related to surface water-rock interaction [29][30][31] . The oxygen isotopes of primary melts are therefore sensitive to contributions from hydrothermally altered recycled components.…”

Section: Hydration Of the Mtz By Stagnant Pacific Slab Central-eastmentioning

confidence: 99%

Continental flood basalts derived from the hydrous mantle transition zone

et al. 2015

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“…These outcrop toward the eastern margin of the LFB, where the metasedimentary pile may be thin or absent (Collins, 1998) and, as such, the majority of the granites from these batholiths have I-type affinities. The samples are taken from 6 of the 7 supersuites recognised in this area (Moruya, Cobargo, Glenbog, Tonghi, Candelo and Bemboka;Chappell et al, 1991) Mattey et al, 1994).…”

Section: Bega and Moruya Batholithsmentioning

confidence: 99%

The silicon isotope composition of granites

Savage

Georg

Williams

et al. 2012

Geochimica et Cosmochimica Acta

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Because weathering results in preferential incorporation of the lighter Si isotopes into clay minerals, the Si in magmas derived from (meta)sedimentary lithologies enriched in such phases should also be isotopically light, relative to melts derived from igneous sources. With the advent of new high precision techniques it should therefore be possible to resolve such differences. Hence, Si isotopes have to potential to distinguish between, and characterise, different magmatic source regions.To explore this, here we report the Si isotopic compositions of a suite of Phanerozoic I-, S-and A-type granites and mineral separates, as well as samples of associated country rock. The whole-rock data fall between δ30Si = −0.40 and −0.11 ± 0.04‰ (95% s.e.). This range is more limited than that defined by previous low precision measurements of granites, but is significantly broader than that displayed by more recent, high precision, measurements of high-Si extrusive igneous rocks. As predicted, S-type granites are, on average, isotopically lighter than I-and A-type samples, and negative correlations with alumina saturation index (ASI) values and initial 87Sr/86Sr provide evidence that Si isotope variations in granites can be explained by variable incorporation of an enriched sedimentary component. However, the relatively small isotopic perturbations and apparent degree of overlap between granite affinities suggest that Si isotopes are not as sensitive to sedimentary input, relative to more established proxies such as, for example, O isotopes. The average Si isotope value of all granites analysed in this study is δ30Si = −0.23 ± 0.15‰ (2 s.d.), which is entirely consistent with a recently published estimate for the continental crust, based on an andesitic bulk composition and the well defined relationship between Si isotopes and magmatic fractionation. AbstractBecause weathering results in preferential incorporation of the lighter Si isotopes into clay minerals, the Si in magmas derived from (meta)sedimentary lithologies enriched in such phases should also be isotopically light, relative to melts derived from igneous sources. With the advent of new high precision techniques it should therefore be possible to resolve such differences. Hence, Si isotopes have to potential to distinguish between, and characterise, different magmatic source regions.To explore this, here we report the Si isotopic compositions of a suite of Phanerozoic I-, S-and A-type granites and mineral separates, as well as samples of associated country rock. The whole-rock data fall between d 30 Si = À0.40 and À0.11 ± 0.04& (95% s.e.). This range is more limited than that defined by previous low precision measurements of granites, but is significantly broader than that displayed by more recent, high precision, measurements of high-Si extrusive igneous rocks. As predicted, Stype granites are, on average, isotopically lighter than I-and A-type samples, and negative correlations with alumina saturation index (ASI) values and initial 87 Sr/ 86 Sr provide e...

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Oxygen isotope composition of mantle peridotite

Cited by 644 publications

References 26 publications

High-3He/4He, depleted mantle and low-δ18O, recycled oceanic lithosphere in the source of central Iceland magmatism

High-3He/4He, depleted mantle and low-δ18O, recycled oceanic lithosphere in the source of central Iceland magmatism

Continental flood basalts derived from the hydrous mantle transition zone

The silicon isotope composition of granites

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