Molybdenum isotope composition of the upper mantle and its origin: insight from mid-ocean ridge basalt

Shuo CHEN

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Molybdenum isotope composition of the upper mantle and its origin: insight from mid-ocean ridge basalt

Deep Sea | Updated：2024-10-14

- Molybdenum isotope composition of the upper mantle and its origin: insight from mid-ocean ridge basalt
- Journal of Oceanology and Limnology Vol. 42, Issue 3, Pages: 705-708(2024)
- Affiliations：
  
  Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
- Author bio：
  
  shuochen@qdio.ac.cn
- Funds：
- DOI：
  CLC：
- Received：21 November 2023，
  
  Online First：12 January 2024，
  
  Published：01 May 2024
- Accepted：
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CHEN Shuo.Molybdenum isotope composition of the upper mantle and its origin: insight from mid-ocean ridge basalt[J].Journal of Oceanology and Limnology,2024,42(03):705-708.
DOI：

CHEN Shuo.Molybdenum isotope composition of the upper mantle and its origin: insight from mid-ocean ridge basalt[J].Journal of Oceanology and Limnology,2024,42(03):705-708. DOI：

摘要

Abstract

The molybdenum (Mo) isotope system is pivotal in reconstructing marine redox changes throughout Earth’s history and has emerged as a promising tracer for igneous and metamorphic processes. Understanding its composition and variation across major geochemical reservoirs is essential for its application in investigating high-temperature processes. However

there is debate regarding the δ

98/95

Mo value of the Earth’s mantle

with estimates ranging from sub-chondritic to super-chondritic values. Recent analyses of global mid-ocean ridge basalt (MORB) glasses revealed significant δ

98/95

Mo variations attributed to mantle heterogeneity

proposing a two-component mixing model to explain the observed variation. Complementary studies confirmed the sub-chondritic δ

98/95

Mo of the depleted upper mantle

suggesting remixing of subduction-modified oceanic crust as a plausible mechanism. These findings underscore the role of Mo isotopes as effective tracers for understanding dynamic processes associated with mantle-crustal recycling.

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references

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