Characteristics of composition and source of rare earth elements in the seafloor hydrothermal products from the Southwest Indian Ridge

Li Xiaohu; Chu Fengyou; Zhang Pingping; Lei Jijiang; Yu Xing; Zhao Hongqiao

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Li Xiaohu, Chu Fengyou, Zhang Pingping, Lei Jijiang, Yu Xing, Zhao Hongqiao. Characteristics of composition and source of rare earth elements in the seafloor hydrothermal products from the Southwest Indian Ridge[J]. Haiyang Xuebao, 2014, 36(6): 33-41.

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Characteristics of composition and source of rare earth elements in the seafloor hydrothermal products from the Southwest Indian Ridge

Key Laboratory of Submarine Geoscience of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2013-06-05

Abstract

Abstract

Rare earth element (REE) measurements were carried out on samples from the Southwest Indian Ridge. The results show that the variation range of ∑REE is from 3.47°10^-7 to 4.80°10^-5 with three orders of magnitude which are similar to the difference of ∑REE content between hydrothermal fluid and seawater. The ratio of LREE/HREE (from 2.06 to 6.16),δEu value (δEu:0.86 to 3.88) and δCe value (δCe:0.40 to 0.86) of the hydrothermal products indicate that there are significant differentiation between LREE and HREE,and REE patterns with middle positive Eu abnormal and negative Ce abnormal. There are two different characteristics of REE pattern with chondrite normalization: (1) ∑REE is more than 2°10^-5,which shows slightly enrich LREE with relatively flat pattern; (2) ∑REE is less than 5°10^-7,which shows significantly enrich LREE with middle positive Eu abnormal pattern. The former pattern is similar to the REE pattern of volcanic rock from the oceanic crust. The latter pattern is similar to REE pattern of black smoker from the Southwest Indian Ridge,which is also similar to REE pattern with LREE enrichment and positive Eu abnormal pattern of the typical hydrothermal fluid and sulfide from mid-ocean ridge. The results of REE composition and REE pattern,as well as the strong positive relationship among Mg concentration and LREE concentration,suggest that the hydrothermal products affected extensively by the recycling of hydrothermal fluid and alteration of seawater,although sulfide precipitating at the initial phase of mixing between hydrothermal fluid and seawater in the Southwest Indian Ridge.
- rare earth element (REE),
- hydrothermal products,
- source,
- hydrothermal fluid,
- Southwest Indian Ridge

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