Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge: Implications of their vent fluids'distinct chemistry

Hidenori Kumagai, K. Nakamura, T. Toki, T. Morishita, K. Okino, J. I. Ishibashi, U. Tsunogai, S. Kawagucci, T. Gamo, T. Shibuya, T. Sawaguchi, N. Neo, M. Joshima, T. Sato, K. Takai

Research output: Contribution to journalArticle

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Abstract

Hydrogen-rich hydrothermal areas, such as those in the Indian Ocean, may have had an influence on early evolution of life on Earth and thus have attracted interest because they may be a proxy for ancient ecosystems. The Kairei and Edmond hydrothermal fields in the Indian Ocean are separated by 160 km, but exhibit distinct fluid chemistry: Kairei fluids are hydrogen-rich; Edmond fluids are hydrogen-poor. At this region, the Central Indian Ridge shows an intermediate spreading rate, 48 mm year-1 as full rate, where the hydrothemal fields occur. Kairei field vent fluids show persistently high concentrations of H2. The Kairei field seems to be unique among hydrogen-enriched hydrothermal regions: most similar hydrogen-rich hydrothermal activity occurs along slowly spreading ridge, <40 mm year-1. The geological and tectonic aspects of the Kairei and Edmond hydrothermal fields were studied to try to elucidate geological constraints on hydrogen production. Visual observations of the seafloor near Kairei from a submersible revealed olivine-rich plutonic rocks with olivine gabbro-troctolite-dunite assemblages exposed within 15 km of the vent field, with serpentinized ultramafic mantle rocks on the Oceanic Core Complex (OCC). The OCC area might be a recharge zone of Kairei hydrothermal activity producing H2-rich vent fluids. The chaotic seafloor within 30 km of the Kairei field reflects a magma-starved condition persisting there for 1 Myr. Asymmetric geomagnetic and gravity anomalies near the Kairei field can be used to infer that patchy olivine-rich intrusions are scattered within mantle ultramafics, where infiltrated seawater reacts with magma and ultramafic rocks or olivine-rich rocks. The heterogeneous uppermost lithosphere containing shallow olivine-rich rock facies surrounding the Kairei field provides abundant H2 into the vent fluid through serpentinization. The hydrogen-rich Kairei field is hosted by basalt, with mafic-ultramafic olivine-rich lithology; the ordinary, hydrogen-poor Edmond field is hosted by a normal basaltic lithology. The contrasting geochemical signatures of the two fields reported here can also be found in ancient rocks from a juvenile Earth. This suggests that lithology-controlled generation of hydrogen may have operated for a long time and be relevant to the origin of life on Earth.

Original languageEnglish
Pages (from-to)239-251
Number of pages13
JournalGeofluids
Volume8
Issue number4
DOIs
Publication statusPublished - Dec 8 2008

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hydrogen
fluid
olivine
lithology
hydrothermal activity
rock
seafloor
magma
mantle
origin of life
serpentinization
dunite
plutonic rock
submersible
ultramafic rock
gravity anomaly
gabbro
recharge
lithosphere
basalt

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge : Implications of their vent fluids'distinct chemistry. / Kumagai, Hidenori; Nakamura, K.; Toki, T.; Morishita, T.; Okino, K.; Ishibashi, J. I.; Tsunogai, U.; Kawagucci, S.; Gamo, T.; Shibuya, T.; Sawaguchi, T.; Neo, N.; Joshima, M.; Sato, T.; Takai, K.

In: Geofluids, Vol. 8, No. 4, 08.12.2008, p. 239-251.

Research output: Contribution to journalArticle

Kumagai, H, Nakamura, K, Toki, T, Morishita, T, Okino, K, Ishibashi, JI, Tsunogai, U, Kawagucci, S, Gamo, T, Shibuya, T, Sawaguchi, T, Neo, N, Joshima, M, Sato, T & Takai, K 2008, 'Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge: Implications of their vent fluids'distinct chemistry', Geofluids, vol. 8, no. 4, pp. 239-251. https://doi.org/10.1111/j.1468-8123.2008.00223.x
Kumagai, Hidenori ; Nakamura, K. ; Toki, T. ; Morishita, T. ; Okino, K. ; Ishibashi, J. I. ; Tsunogai, U. ; Kawagucci, S. ; Gamo, T. ; Shibuya, T. ; Sawaguchi, T. ; Neo, N. ; Joshima, M. ; Sato, T. ; Takai, K. / Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge : Implications of their vent fluids'distinct chemistry. In: Geofluids. 2008 ; Vol. 8, No. 4. pp. 239-251.
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N2 - Hydrogen-rich hydrothermal areas, such as those in the Indian Ocean, may have had an influence on early evolution of life on Earth and thus have attracted interest because they may be a proxy for ancient ecosystems. The Kairei and Edmond hydrothermal fields in the Indian Ocean are separated by 160 km, but exhibit distinct fluid chemistry: Kairei fluids are hydrogen-rich; Edmond fluids are hydrogen-poor. At this region, the Central Indian Ridge shows an intermediate spreading rate, 48 mm year-1 as full rate, where the hydrothemal fields occur. Kairei field vent fluids show persistently high concentrations of H2. The Kairei field seems to be unique among hydrogen-enriched hydrothermal regions: most similar hydrogen-rich hydrothermal activity occurs along slowly spreading ridge, <40 mm year-1. The geological and tectonic aspects of the Kairei and Edmond hydrothermal fields were studied to try to elucidate geological constraints on hydrogen production. Visual observations of the seafloor near Kairei from a submersible revealed olivine-rich plutonic rocks with olivine gabbro-troctolite-dunite assemblages exposed within 15 km of the vent field, with serpentinized ultramafic mantle rocks on the Oceanic Core Complex (OCC). The OCC area might be a recharge zone of Kairei hydrothermal activity producing H2-rich vent fluids. The chaotic seafloor within 30 km of the Kairei field reflects a magma-starved condition persisting there for 1 Myr. Asymmetric geomagnetic and gravity anomalies near the Kairei field can be used to infer that patchy olivine-rich intrusions are scattered within mantle ultramafics, where infiltrated seawater reacts with magma and ultramafic rocks or olivine-rich rocks. The heterogeneous uppermost lithosphere containing shallow olivine-rich rock facies surrounding the Kairei field provides abundant H2 into the vent fluid through serpentinization. The hydrogen-rich Kairei field is hosted by basalt, with mafic-ultramafic olivine-rich lithology; the ordinary, hydrogen-poor Edmond field is hosted by a normal basaltic lithology. The contrasting geochemical signatures of the two fields reported here can also be found in ancient rocks from a juvenile Earth. This suggests that lithology-controlled generation of hydrogen may have operated for a long time and be relevant to the origin of life on Earth.

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