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Adams JV, Jackson MG, Spera FJ, Price AA, Byerly BL, Seward G, Cottle JM. Extreme isotopic heterogeneity in Samoan clinopyroxenes constrains sediment recycling. Nat Commun 2021; 12:1234. [PMID: 33623014 PMCID: PMC7902626 DOI: 10.1038/s41467-021-21416-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 01/21/2021] [Indexed: 11/09/2022] Open
Abstract
Lavas erupted at hotspot volcanoes provide evidence of mantle heterogeneity. Samoan Island lavas with high 87Sr/86Sr (>0.706) typify a mantle source incorporating ancient subducted sediments. To further characterize this source, we target a single high 87Sr/86Sr lava from Savai'i Island, Samoa for detailed analyses of 87Sr/86Sr and 143Nd/144Nd isotopes and major and trace elements on individual magmatic clinopyroxenes. We show the clinopyroxenes exhibit a remarkable range of 87Sr/86Sr-including the highest observed in an oceanic hotspot lava-encompassing ~30% of the oceanic mantle's total variability. These new isotopic data, data from other Samoan lavas, and magma mixing calculations are consistent with clinopyroxene 87Sr/86Sr variability resulting from magma mixing between a high silica, high 87Sr/86Sr (up to 0.7316) magma, and a low silica, low 87Sr/86Sr magma. Results provide insight into the composition of magmas derived from a sediment-infiltrated mantle source and document the fate of sediment recycled into Earth's mantle.
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Affiliation(s)
- Jenna V Adams
- Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, USA.
| | - Matthew G Jackson
- Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, USA.,Isotope Geochemistry Facility - Center for Mantle Zoology, University of California Santa Barbara, Department of Earth Science, Santa Barbara, CA, USA
| | - Frank J Spera
- Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Allison A Price
- Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Benjamin L Byerly
- Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, USA.,Thermo Fisher Scientific, Waltham, MA, USA
| | - Gareth Seward
- Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, USA
| | - John M Cottle
- Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, USA
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Niu Y, Batiza R. Magmatic processes at a slow spreading ridge segment: 26°S Mid-Atlantic Ridge. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/94jb01663] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Niu Y, Batiza R. An empirical method for calculating melt compositions produced beneath mid-ocean ridges: Application for axis and off-axis (seamounts) melting. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/91jb01933] [Citation(s) in RCA: 195] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Affiliation(s)
- David J. Earl
- Departments of Bioengineering and Physics & Astronomy, Rice University, 6100 Main StreetMS142, Houston, Texas 77005, and Rudolf Peierls Centre for Theoretical Physics, Oxford University, 1 Keble Road, Oxford OX1 3NP, United Kingdom
| | - Michael W. Deem
- Departments of Bioengineering and Physics & Astronomy, Rice University, 6100 Main StreetMS142, Houston, Texas 77005, and Rudolf Peierls Centre for Theoretical Physics, Oxford University, 1 Keble Road, Oxford OX1 3NP, United Kingdom
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Vlastélic I, Dosso L, Bougault H, Aslanian D, Géli L, Etoubleau J, Bohn M, Joron JL, Bollinger C. Chemical systematics of an intermediate spreading ridge: The Pacific-Antarctic Ridge between 56°S and 66°S. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jb900234] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Janney PE, Castillo PR. Basalts from the Central Pacific Basin: Evidence for the origin of Cretaceous igneous complexes in the Jurassic western Pacific. ACTA ACUST UNITED AC 1996. [DOI: 10.1029/95jb03119] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Grindlay NR, Fox PJ, Vogt PR. Morphology and tectonics of the Mid-Atlantic Ridge (25°–27°30′S) from Sea Beam and magnetic data. ACTA ACUST UNITED AC 1992. [DOI: 10.1029/91jb02981] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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