Detrital peridotite minerals reveal recycled arc mantle beneath Marion Rise, Southwest Indian Ridge

The recycling of subcontinental lithospheric mantle back into the asthenosphere during continental breakup is potentially a major but underappreciated process in plate tectonics. Here, we report major and trace elements for detrital peridotite minerals in carbonate breccias dredged from the Marion R...

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Published inTerra nova (Oxford, England) Vol. 36; no. 3; pp. 230 - 238
Main Authors Lin, Yin‐Zheng, Liu, Chuan‐Zhou, Dick, Henry J. B., Mitchell, Ross N., Wu, Shi‐Tou, Liu, Tong, Zhang, Wei‐Qi, Zhang, Zhen‐Yu
Format Journal Article
LanguageEnglish
Published Oxford Blackwell Publishing Ltd 01.06.2024
Subjects
abyssal peridotites
Asthenosphere
Carbonates
Geochemistry
Marion Rise
Minerals
Peridotite
Plate tectonics
recycled mantle wedge
Ridges
Southwest Indian Ridge
Subduction
Subduction zones
Tectonics
Trace elements
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Summary:The recycling of subcontinental lithospheric mantle back into the asthenosphere during continental breakup is potentially a major but underappreciated process in plate tectonics. Here, we report major and trace elements for detrital peridotite minerals in carbonate breccias dredged from the Marion Rise, Southwest Indian Ridge. With an emphasis on the trace elements of the relatively abundant orthopyroxene detrital grains, the results show that a portion of pyroxene grains was likely derived from a mantle source that experienced hydrous melting and slab‐derived melt metasomatism above a subduction zone. This finding provides a novel view into the mantle geochemistry at midocean ridges, as well as evidence that Marion Rise is at least partially supported by chemically buoyant recycled refractory mantle wedge material.
ISSN:0954-4879
1365-3121
DOI:10.1111/ter.12702