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Redox Heterogeneity in Mid-Ocean Ridge Basalts as a Function of Mantle Source.

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Title: Redox Heterogeneity in Mid-Ocean Ridge Basalts as a Function of Mantle Source.
Authors: Cottrell, Elizabeth, Kelley, Katherine A.
Source: Science (pre-March 2025). 6/14/2013, Vol. 340 Issue 6138, p1314-1317. 4p.
Subjects: Geochemistry, Oxidation, Basalt analysis, Magmas, Obsidian, Carbon & the environment, Earth's mantle
Geographic Terms: Mid-Atlantic Ridge
Abstract: The oxidation state of Earth's upper mantle both influences and records mantle evolution, but systematic fine-scale variations in upper mantle oxidation state have not previously been recognized in mantle-derived lavas from mid-ocean ridges. Through a global survey of mid-ocean ridge basalt glasses, we show that mantle oxidation state varies systematically as a function of mantle source composition. Negative correlations between Fe3+/σFe ratios and indices of mantle enrichment--such as 87Sr/86Sr, 208Pb/204Pb, Ba/La, and Nb/Zr ratios--reveal that enriched mantle is more reduced than depleted mantle. Because carbon may act to simultaneously reduce iron and generate melts that share geochemical traits with our reduced samples, we propose that carbon creates magmas at ridges that are reduced and enriched. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Redox Heterogeneity in Mid-Ocean Ridge Basalts as a Function of Mantle Source.
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  Data: <searchLink fieldCode="AR" term="%22Cottrell%2C+Elizabeth%22">Cottrell, Elizabeth</searchLink><br /><searchLink fieldCode="AR" term="%22Kelley%2C+Katherine+A%2E%22">Kelley, Katherine A.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 6/14/2013, Vol. 340 Issue 6138, p1314-1317. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Basalt+analysis%22">Basalt analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Magmas%22">Magmas</searchLink><br /><searchLink fieldCode="DE" term="%22Obsidian%22">Obsidian</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+%26+the+environment%22">Carbon & the environment</searchLink><br /><searchLink fieldCode="DE" term="%22Earth's+mantle%22">Earth's mantle</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Mid-Atlantic+Ridge%22">Mid-Atlantic Ridge</searchLink>
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  Label: Abstract
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  Data: The oxidation state of Earth's upper mantle both influences and records mantle evolution, but systematic fine-scale variations in upper mantle oxidation state have not previously been recognized in mantle-derived lavas from mid-ocean ridges. Through a global survey of mid-ocean ridge basalt glasses, we show that mantle oxidation state varies systematically as a function of mantle source composition. Negative correlations between Fe3+/σFe ratios and indices of mantle enrichment--such as 87Sr/86Sr, 208Pb/204Pb, Ba/La, and Nb/Zr ratios--reveal that enriched mantle is more reduced than depleted mantle. Because carbon may act to simultaneously reduce iron and generate melts that share geochemical traits with our reduced samples, we propose that carbon creates magmas at ridges that are reduced and enriched. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.1233299
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      – Code: eng
        Text: English
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      – SubjectFull: Geochemistry
        Type: general
      – SubjectFull: Oxidation
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      – SubjectFull: Basalt analysis
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      – SubjectFull: Magmas
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      – SubjectFull: Obsidian
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      – SubjectFull: Carbon & the environment
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      – SubjectFull: Earth's mantle
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      – SubjectFull: Mid-Atlantic Ridge
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              Text: 6/14/2013
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              Y: 2013
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