Geochemistry and provenance of the sediment core from the rift valley of the Southwest Indian Ridge(49.58°E)

HUANG Yongjin; TAO Chunhui; LIANG Jin; LIAO Shili; YANG Weifang

2021 Vol. 40, No. 2-3

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HUANG Yongjin, TAO Chunhui, LIANG Jin, LIAO Shili, YANG Weifang. Geochemistry and provenance of the sediment core from the rift valley of the Southwest Indian Ridge(49.58°E)[J]. Geological Bulletin of China, 2021, 40(2-3): 320-329.

Citation:

HUANG Yongjin, TAO Chunhui, LIANG Jin, LIAO Shili, YANG Weifang. Geochemistry and provenance of the sediment core from the rift valley of the Southwest Indian Ridge(49.58°E)[J]. Geological Bulletin of China, 2021, 40(2-3): 320-329.

Geochemistry and provenance of the sediment core from the rift valley of the Southwest Indian Ridge(49.58°E)

1.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, Zhejiang, China
2.
Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, Zhejiang, China
3.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China

More Information

Corresponding author: TAO Chunhui, taochunhuimail@163.com

Received Date: 27 January 2021

Revised Date: 08 February 2021

Publish Date: 15 March 2021

Abstract

Abstract

The current research on the sediments of the Southwest Indian Ridge(SWIR) mainly focuses on the surface sediments of the flank of the ridge, but lack of research on its ridge axis restricts the in-depth understanding of the sediment sources and sedimentary environment in this area.Based on the major element, trace element, REE and Y assay of a sediment core(GC03) collected from SWIR 49.58°E during Chinese DY-49 Cruise, the material source and sedimentary environment of the sediments in the study area were discussed.The results show that the bulk samples are enriched in CaO, LOI and Sr, indicating that calcareous biodeposition is dominant and mixed with basalt debris.The content of the ΣREY is low, with average value of 54.3×10^-6, and the chondrite-nomalized REY distribution patterns show the enrichment of LREE compared to HREE and significant negative Ce and Eu anomaly.The enrichment of metal elements such as Cu、Zn、Fe and Co, and low 100*Al/(Al+Fe+Mn)value characterizing samples from Layer L2(83-87 cmbsf)reveals the presence of a hydrothermal component input.The Ce_anom value and V/(V+Ni)-U/Th discriminant diagram indicate that the study area is generally a stable oxidized environment except for reduction characteristics exhibited from partial samples.
- Southwest Indian Ridge /
- sediment core /
- geochemistry /
- provenance /
- sedimentary environment

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References

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