High Water Content in Primitive Mid-Ocean Ridge Basalt from Southwest Indian Ridge (51.56° E): Implications for Recycled Hydrous Component in the Mantle

Wei Li; Zhenmin Jin; Haiming Li; Chunhui Tao

doi:10.1007/s12583-017-0731-y

Volume 28 Issue 3

Jun 2017

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Journal of Earth Science > 2017 > 28(3): 411-421.

Wei Li, Zhenmin Jin, Haiming Li, Chunhui Tao. High Water Content in Primitive Mid-Ocean Ridge Basalt from Southwest Indian Ridge (51.56° E): Implications for Recycled Hydrous Component in the Mantle. Journal of Earth Science, 2017, 28(3): 411-421. doi: 10.1007/s12583-017-0731-y

Citation:

Wei Li, Zhenmin Jin, Haiming Li, Chunhui Tao. High Water Content in Primitive Mid-Ocean Ridge Basalt from Southwest Indian Ridge (51.56° E): Implications for Recycled Hydrous Component in the Mantle. Journal of Earth Science, 2017, 28(3): 411-421. doi: 10.1007/s12583-017-0731-y

Citation:

Wei Li, Zhenmin Jin, Haiming Li, Chunhui Tao. High Water Content in Primitive Mid-Ocean Ridge Basalt from Southwest Indian Ridge (51.56° E): Implications for Recycled Hydrous Component in the Mantle. Journal of Earth Science, 2017, 28(3): 411-421. doi: 10.1007/s12583-017-0731-y

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High Water Content in Primitive Mid-Ocean Ridge Basalt from Southwest Indian Ridge (51.56° E): Implications for Recycled Hydrous Component in the Mantle

doi: 10.1007/s12583-017-0731-y

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Submarine Geosciences, The Second Institute of Oceanography, SOA, Hangzhou 310012, China

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Author Bio:
Wei Li: http://orcid.org/0000-0002-0983-5800

Zhenmin Jin: http://orcid.org/0000-0001-9844-6135
Corresponding author: Zhenmin Jin, zmjin@cug.edu.cn
Received Date: 09 Jan 2017
Accepted Date: 11 Mar 2017
Publish Date: 01 Jun 2017

Abstract

Abstract

The Southwest Indian Ridge (SWIR) is an ultraslow spreading end-member of mid-ocean ridge system and is characterized by weak or even an absence of magmatism. The segment between Indomed (ITF) and Gallieni (GTF) transform faults in the SWIR, however, displays extremely magmatic accretion with an unusual thick crust (up to 9.5 km). Although H₂O is present in trace amounts in the mantle, it has a strong influence on mantle melting and magmatism in the shallow crust. The mid-ocean ridge basalts (MORB) worldwide show strong variation in H₂O contents, but with a nearly uniform H₂O/Ce ratio. Regionally distinctive H₂O contents and H₂O/Ce ratios are inferred to be related to the H₂O variation in the source and can be used to constrain the mantle heterogenity. In this study, we measured the H₂O and trace elements of clinopyroxene phenocrysts from one basalt dredged from the ITF-GTF segment, SWIR (51.56^oE). The estimated H₂O content (1.3 wt.%±0.3 wt.%) in the primitive ITF-GTF basaltic melt is much higher than that in typical MORB samples, but similar to oceanic island basalts (OIB) and back-arc basalts (BABB). In addition, the calculated H₂O/Ce ratio (1 672–4 990) are extremely high, bearing "arc-like" signature. This study provides evidence that arc-related hydrous components are involved in the mantle source beneath the ITF-GTF ridge segment. It further lends support to the hypothesis that the mantle beneath the central SWIR may have experienced an ancient hydrous melting event in an arc terrain prior to or during the closure of the Mozambique Ocean in the Neoproterozoic.
- clinopyroxene phenocryst,
- FTIR,
- MORB,
- Southwest Indian Ridge,
- water content

Electronic Supplementary Materials: Supplementary materials (Table S1 and APPENDIX I) are available in the online version of this article at http://dx.doi.org/10.1007/s12583-017-0731-y.

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