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Hydrothermal plumes over the Carlsberg Ridge, Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Hydrothermal plumes over the Carlsberg Ridge, Indian Ocean
 
Creator Ray, D.
KameshRaju, K.A.
Baker, E.T.
Rao, A.S.
Mudholkar, A.V.
Lupton, J.E.
SuryaPrakash, L.
Gawas, R.B.
VijayaKumar, T.
 
Subject hydrothermal activity
plumes
hydrothermal springs
water column
 
Description Water column surveys and sampling in 2007 and 2009 was conducted to search for hydrothermal plumes over a segment of the Carlsberg Ridge. An evidence for two separate vent fields, one near 3 degrees 42′N, 63 degrees 40′E and another near 3 degrees 41.5′N, 63 degrees 50′E, on a segment that is apparently sparsely magmatic is reported. Both sites appear to be located on off-axis highs at the top of the southern axial valley wall, at depths of approx 3600 m or shallower (approx 1000 m above the valley floor). At the 63 degrees 40′E site, plume sampling found local maxima in light scattering, temperature anomaly, oxidation-reduction potential (ORP), dissolved Mn, and 3He. No water samples are available from the 63 degrees 50′E site, but it showed robust light-scattering and ORP anomalies at multiple depths, implying multiple sources. ORP anomalies are very short-lived, so the strong signals at both sites suggest that fluid sources lie within a few kilometers or less from the plume sampling locations. Although ultramafic rocks have been recovered near these sites, the light-scattering and dissolved Mn anomalies imply that the plumes do not arise from a system driven solely by exothermic serpentinization (e.g., Lost City). Instead, the source fluids may be a product of both ultramafic and basaltic/gabbroic fluid-rock interaction, similar to the Rainbow and Logatchev fields on the Mid-Atlantic Ridge.
 
Date 2012-02-03T03:59:17Z
2012-02-03T03:59:17Z
2012
 
Type Journal Article
 
Identifier Geochemistry Geophysics Geosystems, vol.13; 2012; 15pp, Q01009, doi:10.1029/2011GC003888
no
http://drs.nio.org/drs/handle/2264/4007
 
Language en
 
Relation Geochem_Geophys_Geosyst_13_15.jpg
 
Rights An edited version of this paper was published by AGU. Copyright [2011] AGU. To view the published open abstract, go to http://dx.doi.org/10.1029/2011GC003888
 
Publisher American Geophysical Union