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First active hydrothermal vents on an ultraslow spreading center; Southwest Indian Ridge

Tao Chunhui, Jian Lin, Guo Shiqin, Yongshun John Chen, Wu Guanghai, Han Xiqiu, Christopher R. German, Dana R. Yoerger, Zhou Ning, Li Huaiming, Su Xin and Zhu Jian
First active hydrothermal vents on an ultraslow spreading center; Southwest Indian Ridge
Geology (Boulder) (November 2011) 40 (1): 47-50


The ultraslow-spreading Southwest Indian Ridge is a major tectonic province, representing one of the important end-member mid-ocean-ridge types for its very slow and oblique spreading, and providing the only known route for migration of chemosynthetic deep-sea vent fauna between the Atlantic and Indian Oceans. We report the investigation of the first active high-temperature hydrothermal field found on any ultraslow mid-ocean ridge worldwide. Located on Southwest Indian Ridge at 37 degrees 47'S, 49 degrees 39'E, it consists of three zones extending approximately 1000 m laterally, and it is one of four recently discovered active and inactive vent sites within a 250-km-long magmatically robust section. Our results provide the first direct evidence for potentially widespread distribution of hydrothermal activity along ultraslow-spreading ridges--at least along magmatically robust segments. This implies that the segment sections with excess heat from enhanced magmatism and suitable crustal permeability along slow and ultraslow ridges might be the most promising areas for searching for hydrothermal activities. It is surprising that the special vent fauna appear to indicate some complex affinity to those on the Central Indian Ridge, southern Mid-Atlantic Ridge, and the southwest Pacific Ocean.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 1
Title: First active hydrothermal vents on an ultraslow spreading center; Southwest Indian Ridge
Affiliation: Second Institute of Oceanography, Key Laboratory of Submarine Geosciences, Hangzhou, China
Pages: 47-50
Published: 20111123
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2012-016322
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012013
Illustration Description: illus. incl. sketch maps
S37°46'60" - S37°46'60", E49°38'60" - E49°38'60"
Secondary Affiliation: Woods Hole Oceanographic Institution, USA, United StatesPeking University, CHN, ChinaChina University of Geosciences, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201209
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