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Constraints from uranium and molybdenum isotope ratios on the origin of enriched mid-ocean ridge basalts

Constraints from uranium and molybdenum isotope ratios on the origin of enriched mid-ocean ridge basalts

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.epsl.2025.119491. This is version 2 of this Preprint.

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Authors

Joel Rodney , Morten Andersen, Bramley Murton, Tim Elliott

Abstract

Most mid-ocean ridge basalts (MORB) are depleted in highly incompatible elements relative to the primitive mantle and are termed normal (N)-MORB. Some MORB, erupted at ridge segments distal from mantle hot-spots, are enriched in incompatible elements. The origin of these enriched (E)-MORB is debated, although many studies have proposed that recycled oceanic crust shapes their compositions. Uranium (U) and molybdenum (Mo) isotope ratios have been argued to trace the contribution of recycled oceanic crust in the source of N-MORB, which has high δ238U and low δ98/95Mo relative to the bulk silicate Earth (BSE). Here, we provide U and Mo is...  more

DOI

https://doi.org/10.31223/X5PT4D

Subjects

Physical Sciences and Mathematics

Keywords

U isotopes, Mo isotopes, Enriched MORB, Crustal recycling, Low degree partial melting

Dates

Published: 2024-11-16 07:35

Last Updated: 2025-06-17 23:54

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License

CC BY Attribution 4.0 International