A review of studies on the magmatism at Southwest Indian Ridge from petrological and geochemical perspectives

SUN Guohong; TIAN Liyan; LI Xiaohu; ZHANG Hanyu; CHEN Lingxuan; LIU Hongling

doi:10.16562/j.cnki.0256-1492.2021021701

Marine Geology & Quaternary Geology > 2021 > 41(5): 126-138. > DOI: 10.16562/j.cnki.0256-1492.2021021701

SUN Guohong, TIAN Liyan, LI Xiaohu, ZHANG Hanyu, CHEN Lingxuan, LIU Hongling. A review of studies on the magmatism at Southwest Indian Ridge from petrological and geochemical perspectives[J]. Marine Geology & Quaternary Geology, 2021, 41(5): 126-138. DOI: 10.16562/j.cnki.0256-1492.2021021701

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A review of studies on the magmatism at Southwest Indian Ridge from petrological and geochemical perspectives

1.
Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Key Laboratory of Submarine Science, Ministry of Natural Resources, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

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Received Date: February 16, 2021
Revised Date: June 13, 2021
Available Online: August 25, 2021

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Abstract

Abstract

The Southwest Indian Ridge (SWIR), as an ultraslow spreading ridge, has attracted great attentions from the geo-society of the world in the past three decades due to its unique morphology, crustal architecture, crustal accretion mode, volcanism, hydrothermal activities and deep mantle processes. This paper is devoted to the recent research progress on the petrology and geochemistry of basalt,gabbro and mantle peridotite collected from the SWIR. The geochemical data well revealed the variations of the whole ridge and ridge segments. Based on the data mentioned above, we described and discussed the main factors, which control the geochemical variations, magma supply and crustal accretion. In the oblique spreading ridge segment of 9°～16°E, the tectonics-dominated ocean ridge spreading patterns resulted in the wider oceanic crust accretion zone with significant geochemical anomalies; in the 50°～51°E ridge segment, strong volcanic activities occur, and its genetic mechanism includes different points of view, such as the interaction between the Crozet hotspot and SWIR, the micro hotspot, and the remelting of the residual mantle left behind by the former melting events. The latest research about the Longqi hydrothermal area (～ 49.7° E) suggests that the hydrothermal circulation is closely related to the development of detachment faults, and the maximum depth of hydrothermal circulation may reach 6 km below the Moho boundary. Therefore, it is suggested that the future study be strengthened in such issues as the mantle heterogeneity in different spatial scales, the tectonic-magmatic processes in the ridge system, ridge-plume interaction, and the seafloor hydrothermal activity and deposits.
- ultra-slow spreading ridge,
- petrology and geochemistry,
- magmatism,
- hydrothermal activity,
- Southwest Indian Ridge

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References (73)

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