Hydrothermal methane and manganese variation in the plume over the superfast-spreading southern East Pacific Rise

Junichiro Ishibashi, Hiroshi Wakita, Kei Okamura, Eiichiro Nakayama, Richard A. Feely, Geoffrey T. Lebon, Edward T. Baker, Katsumi Marumo

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Onboard analyses of dissolved CH4 and Mn were conducted on the water column along the southern East Pacific Rise between 13°50′ and 18°40′S during the 1993 RIDGE FLUX Cruise. Many hydrothermal plumes were identified by chemical anomalies which overlie more than half of the surveyed ridge crest. The CH4/Mn ratio in the plumes shows wide variability ranges from about 0.05 to 3.9 due to wide range of CH4 concentration. The CH4-rich plumes were detected in the region of 16°00′-18°40′S where vigorous magmatic budget was confirmed by previous studies. Moreover, the CH4/Mn ratio of the plumes is highly correlated with other volatile/metal parameters such as the S/Fe ratio in plume particulate. These results strongly suggest that volatile input caused by magmatic perturbation to hydrothermal systems is responsible for the CH4/Mn variability in the southern EPR plumes, based on analogy of the case at the EPR 9°50′N site. The detection of several volatile-rich plumes and the extensive hydrothermal flux of volatile species are attributed to frequent magmatic events in the superfast spreading southern EPR.

Original languageEnglish
Pages (from-to)485-500
Number of pages16
JournalGeochimica et Cosmochimica Acta
Volume61
Issue number3
DOIs
Publication statusPublished - Feb 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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