The hydrothermal plumes over the Southwest Indian Ridge from 49&#176;E to 56&#176;E: Evidence from helium isotope anomalies of deep seawater

Lu Yingyu; Han Xiqiu; Wang Yejian; Qiu Zhongyan

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Lu Yingyu, Han Xiqiu, Wang Yejian, Qiu Zhongyan. The hydrothermal plumes over the Southwest Indian Ridge from 49°E to 56°E: Evidence from helium isotope anomalies of deep seawater[J]. Haiyang Xuebao, 2014, 36(6): 42-49.

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The hydrothermal plumes over the Southwest Indian Ridge from 49°E to 56°E: Evidence from helium isotope anomalies of deep seawater

Second Institute of Oceanography & Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2013-03-23

Abstract

Abstract

The helium isotope anomaly in the seawater is a good indicator of the hydrothermal activity in the seafloor. During DY115-21 cruise Leg 7,five CTD Toyo profiles were deployed between 49°E and 56°E on the Southwest Indian Ridge and 14 seawater samples were collected for helium and neon isotope analysis. In this paper,we examine the helium isotope anomalies in the water column and discuss the distribution of the hydrothermal plumes in the investigated area. Our results show that all of the five CTD profiles exhibit distinct δ³ He anomalies. Sample CTD7-2 which was sampled at 37.927°S,49.412°E in the water depth of 2 140 m (100 m above the seafloor) exhibited the largest δ³ He anomaly of 49.2%. According to the distribution pattern of δ³ He,it is suggested that there may existed at least 6 hydrothermal plumes in the investigated area,and one active hydrothermal venting site probably lies within a few kilometers west of 37.927°S,49.412°E.
- Southwest Indian Ridge,
- helium isotope anomalies,
- hydrothermal plume,
- seafloor hydrothermal activities

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References(43)

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