Trace elements in abyssal peridotite olivine record melting, thermal evolution, and melt refertilization in the oceanic upper mantle

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Author(s)Lin, Kuan-Yu
Author(s)Warren, Jessica M.
Author(s)Davis, Fred A.
Date Accessioned2024-01-11T19:43:02Z
Date Available2024-01-11T19:43:02Z
Publication Date2023-09-06
DescriptionThis article was originally published in Contributions to Mineralogy and Petrology. The version of record is available at: https://doi.org/10.1007/s00410-023-02044-6. © The Author(s) 2023.
AbstractTrace element concentrations in abyssal peridotite olivine provide insights into the formation and evolution of the oceanic lithosphere. We present olivine trace element compositions (Al, Ca, Ti, V, Cr, Mn, Co, Ni, Zn, Y, Yb) from abyssal peridotites to investigate partial melting, melt–rock interaction, and subsolidus cooling at mid-ocean ridges and intra-oceanic forearcs. We targeted 44 peridotites from fast (Hess Deep, East Pacific Rise) and ultraslow (Gakkel and Southwest Indian Ridges) spreading ridges and the Tonga trench, including 5 peridotites that contain melt veins. We found that the abundances of Ti, Mn, Co, and Zn increase, while Ni decreases in melt-veined samples relative to unveined samples, suggesting that these elements are useful tracers of melt infiltration. The abundances of Al, Ca, Cr, and V in olivine are temperature sensitive. Thermometers utilizing Al and Ca in olivine indicate temperatures of 650–1000 °C, with variations corresponding to the contrasting cooling rates the peridotites experienced in different tectonic environments. Finally, we demonstrate with a two-stage model that olivine Y and Yb abundances reflect both partial melting and subsolidus re-equilibration. Samples that record lower Al- and Ca-in-olivine temperatures experienced higher extents of diffusive Y and Yb loss during cooling. Altogether, we demonstrate that olivine trace elements document both high-temperature melting and melt–rock interaction events, as well as subsolidus cooling related to their exhumation and emplacement onto the seafloor. This makes them useful tools to study processes associated with seafloor spreading and mid-ocean ridge tectonics.
SponsorThe authors acknowledge Kendra J. Lynn and Suzanne Birner for sharing their samples and data. We thank Chin-Chen Kuo and Gerald Poirier for LA-ICPMS support at UD. This research used samples provided by the International Ocean Discovery Program (IODP) from ODP Leg 147, Site 895 (Hess Deep). Subsolidus cooling models presented in this study greatly benefited from fruitful discussions on lattice strain models with Emmanuel Codillo and publicly shared files by Chenguang Sun. Thoughtful reviews by Dante Canil, Jason Harvey, and Yan Liang helped strengthen the manuscript substantially and are greatly appreciated. K.-Y. Lin thanks the Department of Earth Sciences and the Graduate College at the University of Delaware for the UD Doctoral fellowship, both of which aided in the completion of this work. Olivine analytical technique development was supported by NSF Grant EAR-1939964 to JMW.
CitationLin, KY., Warren, J.M. & Davis, F.A. Trace elements in abyssal peridotite olivine record melting, thermal evolution, and melt refertilization in the oceanic upper mantle. Contrib Mineral Petrol 178, 66 (2023). https://doi.org/10.1007/s00410-023-02044-6
ISSN1432-0967
URLhttps://udspace.udel.edu/handle/19716/33829
Languageen_US
PublisherContributions to Mineralogy and Petrology
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
Keywordsabyssal peridotite
Keywordsmid-ocean ridge tectonics
Keywordsolivine chemistry
Keywordsgeothermometry
TitleTrace elements in abyssal peridotite olivine record melting, thermal evolution, and melt refertilization in the oceanic upper mantle
TypeArticle
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