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Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions

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Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions. / Walowski, K. J.; Kirstein, L. A.; De Hoog, J. C.M.; Elliott, T. R.; Savov, I. P.; Jones, R. E.; EIMF.

In: Earth and Planetary Science Letters, Vol. 508, 15.02.2019, p. 97-108.

Research output: Contribution to journalArticle

Harvard

Walowski, KJ, Kirstein, LA, De Hoog, JCM, Elliott, TR, Savov, IP, Jones, RE & EIMF 2019, 'Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions', Earth and Planetary Science Letters, vol. 508, pp. 97-108. https://doi.org/10.1016/j.epsl.2018.12.005

APA

Walowski, K. J., Kirstein, L. A., De Hoog, J. C. M., Elliott, T. R., Savov, I. P., Jones, R. E., & EIMF (2019). Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions. Earth and Planetary Science Letters, 508, 97-108. https://doi.org/10.1016/j.epsl.2018.12.005

Vancouver

Walowski KJ, Kirstein LA, De Hoog JCM, Elliott TR, Savov IP, Jones RE et al. Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions. Earth and Planetary Science Letters. 2019 Feb 15;508:97-108. https://doi.org/10.1016/j.epsl.2018.12.005

Author

Walowski, K. J. ; Kirstein, L. A. ; De Hoog, J. C.M. ; Elliott, T. R. ; Savov, I. P. ; Jones, R. E. ; EIMF. / Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions. In: Earth and Planetary Science Letters. 2019 ; Vol. 508. pp. 97-108.

Bibtex

@article{eec4dedef4e942dcb31b39e59808baa3,
title = "Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions",
abstract = "Recycling of the lithosphere via subduction drives the trace element and isotopic heterogeneity of the mantle, yet, the inventory of volatile elements in the diverse array of mantle reservoirs sampled at ocean islands remains uncertain. Boron is an ideal tracer of volatile recycling because it behaves similarly to volatiles during high-temperature geochemical reactions and carries a distinctive isotope signature into the mantle, but is subsequently little-influenced by degassing on return to the surface. Furthermore, B-rich recycled lithologies will have a strong influence on typical upper mantle compositions characterized by low B concentrations (<0.2 μg/g and δ 11 B −7.1 ± 0.9‰). Here, we present and compare the B abundances and isotope compositions, together with the volatile element contents (H 2 O, CO 2 , and Cl) of basaltic glasses and olivine-hosted melt inclusions from two different ocean island localities (La Palma, Canary Islands, and Piton de Caille, La R{\'e}union Island). Our results suggest that olivine hosted melt inclusions are protected from contamination during ascent and provide more robust estimates of primary mantle source δ 11 B than previous bulk rock studies. We find that the δ 11 B of the La R{\'e}union samples (−7.9 ± 0.5‰ (2σ)) overlaps with the recently defined MORB datum, indicating that the depleted upper-mantle and ‘primitive mantle’ reservoirs are indistinguishable with respect to δ 11 B, or that B concentrations are sufficiently low that they are diluted by partial melting in the uppermost mantle. In contrast, the La Palma samples, notable for their radiogenic Pb isotope ratios, are characterized by δ 11 B values that are distinctly isotopically lighter (−10.5 ± 0.7‰ (2σ)) than La R{\'e}union or MORB. We suggest these isotopically light values are derived from significantly dehydrated recycled materials preserved in the La Palma mantle source region, in keeping with their lower B/Zr and H 2 O/Ce. This work therefore provides strong new support for subduction zone processing as a mechanism for generating radiogenic Pb isotopic signatures and volatiles heterogeneities in the mantle.",
keywords = "boron isotopes, isotope geochemistry, mantle geochemistry, mantle volatiles, melt inclusions, ocean island basalts",
author = "Walowski, {K. J.} and Kirstein, {L. A.} and {De Hoog}, {J. C.M.} and Elliott, {T. R.} and Savov, {I. P.} and Jones, {R. E.} and EIMF",
year = "2019",
month = "2",
day = "15",
doi = "10.1016/j.epsl.2018.12.005",
language = "English",
volume = "508",
pages = "97--108",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "North-Holland Publishing Company",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Investigating ocean island mantle source heterogeneity with boron isotopes in melt inclusions

AU - Walowski, K. J.

AU - Kirstein, L. A.

AU - De Hoog, J. C.M.

AU - Elliott, T. R.

AU - Savov, I. P.

AU - Jones, R. E.

AU - EIMF

PY - 2019/2/15

Y1 - 2019/2/15

N2 - Recycling of the lithosphere via subduction drives the trace element and isotopic heterogeneity of the mantle, yet, the inventory of volatile elements in the diverse array of mantle reservoirs sampled at ocean islands remains uncertain. Boron is an ideal tracer of volatile recycling because it behaves similarly to volatiles during high-temperature geochemical reactions and carries a distinctive isotope signature into the mantle, but is subsequently little-influenced by degassing on return to the surface. Furthermore, B-rich recycled lithologies will have a strong influence on typical upper mantle compositions characterized by low B concentrations (<0.2 μg/g and δ 11 B −7.1 ± 0.9‰). Here, we present and compare the B abundances and isotope compositions, together with the volatile element contents (H 2 O, CO 2 , and Cl) of basaltic glasses and olivine-hosted melt inclusions from two different ocean island localities (La Palma, Canary Islands, and Piton de Caille, La Réunion Island). Our results suggest that olivine hosted melt inclusions are protected from contamination during ascent and provide more robust estimates of primary mantle source δ 11 B than previous bulk rock studies. We find that the δ 11 B of the La Réunion samples (−7.9 ± 0.5‰ (2σ)) overlaps with the recently defined MORB datum, indicating that the depleted upper-mantle and ‘primitive mantle’ reservoirs are indistinguishable with respect to δ 11 B, or that B concentrations are sufficiently low that they are diluted by partial melting in the uppermost mantle. In contrast, the La Palma samples, notable for their radiogenic Pb isotope ratios, are characterized by δ 11 B values that are distinctly isotopically lighter (−10.5 ± 0.7‰ (2σ)) than La Réunion or MORB. We suggest these isotopically light values are derived from significantly dehydrated recycled materials preserved in the La Palma mantle source region, in keeping with their lower B/Zr and H 2 O/Ce. This work therefore provides strong new support for subduction zone processing as a mechanism for generating radiogenic Pb isotopic signatures and volatiles heterogeneities in the mantle.

AB - Recycling of the lithosphere via subduction drives the trace element and isotopic heterogeneity of the mantle, yet, the inventory of volatile elements in the diverse array of mantle reservoirs sampled at ocean islands remains uncertain. Boron is an ideal tracer of volatile recycling because it behaves similarly to volatiles during high-temperature geochemical reactions and carries a distinctive isotope signature into the mantle, but is subsequently little-influenced by degassing on return to the surface. Furthermore, B-rich recycled lithologies will have a strong influence on typical upper mantle compositions characterized by low B concentrations (<0.2 μg/g and δ 11 B −7.1 ± 0.9‰). Here, we present and compare the B abundances and isotope compositions, together with the volatile element contents (H 2 O, CO 2 , and Cl) of basaltic glasses and olivine-hosted melt inclusions from two different ocean island localities (La Palma, Canary Islands, and Piton de Caille, La Réunion Island). Our results suggest that olivine hosted melt inclusions are protected from contamination during ascent and provide more robust estimates of primary mantle source δ 11 B than previous bulk rock studies. We find that the δ 11 B of the La Réunion samples (−7.9 ± 0.5‰ (2σ)) overlaps with the recently defined MORB datum, indicating that the depleted upper-mantle and ‘primitive mantle’ reservoirs are indistinguishable with respect to δ 11 B, or that B concentrations are sufficiently low that they are diluted by partial melting in the uppermost mantle. In contrast, the La Palma samples, notable for their radiogenic Pb isotope ratios, are characterized by δ 11 B values that are distinctly isotopically lighter (−10.5 ± 0.7‰ (2σ)) than La Réunion or MORB. We suggest these isotopically light values are derived from significantly dehydrated recycled materials preserved in the La Palma mantle source region, in keeping with their lower B/Zr and H 2 O/Ce. This work therefore provides strong new support for subduction zone processing as a mechanism for generating radiogenic Pb isotopic signatures and volatiles heterogeneities in the mantle.

KW - boron isotopes

KW - isotope geochemistry

KW - mantle geochemistry

KW - mantle volatiles

KW - melt inclusions

KW - ocean island basalts

UR - http://www.scopus.com/inward/record.url?scp=85059539520&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2018.12.005

DO - 10.1016/j.epsl.2018.12.005

M3 - Article

VL - 508

SP - 97

EP - 108

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -