Hydrothermal He-3 and manganese plumes at 19 deg 29 min S on the Central Indian Ridge

The discovery of a hydrothermal helium-3 plume north of the Indian Triple Junction, on the Central Indian Ridge at 19 deg 29 min S is reported. Water column delta (He-3) anomalies show a spike of 33.8 percent at 2460 meter depth, i.e., the highest delta He-3 anomaly recorded so far in the Indian oce...

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Published inGeophysical research letters Vol. 19; no. 17; pp. 1787 - 1790
Main Authors Jean-Baptiste, Philippe, MANTISI, FREDERICK, PAUWELLS, HELENE, Grimaud, Daniel, Patriat, Philippe
Format Journal Article
LanguageEnglish
Published 04.09.1992
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Summary:The discovery of a hydrothermal helium-3 plume north of the Indian Triple Junction, on the Central Indian Ridge at 19 deg 29 min S is reported. Water column delta (He-3) anomalies show a spike of 33.8 percent at 2460 meter depth, i.e., the highest delta He-3 anomaly recorded so far in the Indian ocean. The helium-3 data are correlated with manganese, giving a Mn/He-3 ratio of 700 mol/cu cm. The CH4/He-3 ratio deduced from available CH4/Mn data in the same area is around 7 x 10 exp 6. These values are close to what is observed on water column plumes on the East Pacific Rise. On a regional scale, the He-3 distribution over the Indian Triple Junction exhibits a strong delta He-3 increase at the Ridge crest, which appears to spread eastwards through the deep Indian ocean. (Author)
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ISSN:0094-8276