MORB trace element geochemistry in the eastern of southwest indian ridge and its indication for the composition of mantle source

DONG Zhen; LIANG Jin; CAO Zhimin; HE Huizhong; CHEN Liang; LU Rong

doi:10.16562/j.cnki.0256-1492.2021121501

Marine Geology & Quaternary Geology > 2024 > 44(4): 99-107. > DOI: 10.16562/j.cnki.0256-1492.2021121501

DONG Zhen，LIANG Jin，CAO Zhimin，et al. MORB trace element geochemistry in the eastern of southwest indian ridge and its indication for the composition of mantle source[J]. Marine Geology & Quaternary Geology，2024，44(4)：99-107. DOI: 10.16562/j.cnki.0256-1492.2021121501

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MORB trace element geochemistry in the eastern of southwest indian ridge and its indication for the composition of mantle source

DONG Zhen^{1, 2, 3,},
LIANG Jin^3, ,,
CAO Zhimin¹,
HE Huizhong²,
CHEN Liang²,
LU Rong²

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
South China Sea Marine Survey Center, Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou 510275, China
3.
Second Institute of Oceanography, Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China

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Received Date: December 14, 2021
Revised Date: November 20, 2022
Available Online: August 20, 2024

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Abstract

Abstract

The eastern of the southwest Indian ridge (E-SWIR) is located between 61° and 70° E, with relatively low melt supply. Most of the mid-ocean ridge basalts (MORB) produced in this area is a typical E-MORB with the characteristics of enrichment of incompatible elements and large ion lithophile elements. Based on the trace element geochemical data of basalt samples, the analysis of La/Sm, Zr/Nb and Lu/Tb shows that the E-SWIR mantle has obvious heterogeneity, which may be related to the axial variation of pyroxenite content in the mantle. Using the contents of rare earth elements Ce, Sm, Lu and Yb in combination with the simulation results of partial melting calculation, the role and influence of garnet in the mantle source area are further clarified, and it is believed that it may exist in the mantle as auriferous garnet pyroxene. The identification of the nature and occurrence form of eclogites in the E-SWIR mantle source region is the key to discuss the origin of E-MORB, mantle heterogeneity and the tectonic evolution of mid ocean ridge.
- elemental geochemistry,
- composition of mantle source,
- MORB,
- eastern of southwest Indian Ridge

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References (46)

References

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