The potential of Ca isotopes to trace subducted marine carbonates in deep mantle

Hongli ZHU; Renqiang LIAO; Long DU; Zhaofeng ZHANG

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The potential of Ca isotopes to trace subducted marine carbonates in deep mantle

Geology | Updated：2025-02-19

- The potential of Ca isotopes to trace subducted marine carbonates in deep mantle
- Journal of Oceanology and Limnology Vol. 43, Issue 1, Pages: 29-40(2025)
- Affiliations：
  
  1.Key Laboratory of Ocean Observation and Forecasting, Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, China
  2.Laboratory for Marine Geology, Qingdao Marine Science and Technology Center, Qingdao 266237, China
  3.College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
  4.Research Center for Planetary Science, College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
- Author bio：
  
  zhuhongli@qdio.ac.cn
  dulong@sdust.edu.cn
- Funds：
- DOI：
  CLC：
- Received：19 January 2024，
  
  Published：01 January 2025
- Accepted：
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ZHU Hongli,LIAO Renqiang,DU Long,et al.The potential of Ca isotopes to trace subducted marine carbonates in deep mantle[J].Journal of Oceanology and Limnology,2025,43(01):29-40.
DOI：

ZHU Hongli,LIAO Renqiang,DU Long,et al.The potential of Ca isotopes to trace subducted marine carbonates in deep mantle[J].Journal of Oceanology and Limnology,2025,43(01):29-40. DOI：

摘要

Abstract

Marine carbonates

the major carrier of carbon upon the upper crust

can be subducted into the Earth’s interior along with oceanic crust

and then returned to the surface through magmatism

which constitute the deep carbon cycle. This process plays an important role in modulating the CO

concentrations in the atmosphere over geologic time

and thus the forming of the habitable earth. Therefore

identifying recycled marine carbonates in the mantle is critical to well understand the global deep carbon cycle. Calcium is one of the major constituent cations in marine carbonates and its isotopes may be a potential tracer for recycled marine carbonates in the mantle. To further evaluate the capability and challenges of Ca isotopes as such a geochemical tracer

we reviewed the Ca isotopic compositions in important reservoirs and the behavior of Ca isotopes during high-temperature geological processes that are related to the deep carbon cycle

including plate subduction

mantle metasomatism

mantle partial melting

magma differentiation

etc. Available studies show that carbonate-rich marine sediments have significantly lower δ

44/40

Ca than the Earth mantle

and metasomatism by such recycled materials can cause lighter Ca isotopic compositions in deep mantle-derived rocks than those of the depleted mantle and mid-ocean ridge basalts. However

the Ca isotopic fractionation during partial melting of mantle peridotites is small (~0.10‰) and the Ca isotopic fractionation during plate subduction and intermediate-mafic magma evolution is indistinguishable. These investigations suggest that C

a isotopes have great advances in tracing such recycled materials in the mantle. However

other processes (such as the influence by partial melts of eclogites) may induce similar effects on mantle-derived rocks as subducted marine carbonates but still remains debated

and thus further investigations are strongly needed in the future.

关键词

Keywords

references

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