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238 U, 226 Ra and 210 Pb in some vent waters of the Galapagos Spreading Center
Author(s) -
Krishnaswami S.,
Turekian K. K.
Publication year - 1982
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl009i008p00827
Subject(s) - mussel , hydrothermal vent , seawater , basalt , center (category theory) , hydrothermal circulation , oceanography , mineralogy , geology , environmental science , chemistry , geochemistry , biology , ecology , seismology , crystallography
The concentrations of 226 Ra, 238 U and 210 Pb have been measured in waters from the Mussel Bed and the Rose Garden thermal fields at the Galapagos spreading center over a temperature range of ∼2.5‐16°C. The 226 Ra‐T plots yield slopes of 0.112 and 0.036 dpm/kg°C for the Mussel Bed and the Rose Garden respectively yielding a global hydrothermal 226 Ra flux less than 5% of that required to sustain the oceanic inventory. 238 U concentration in waters <9°C is the same as that in ambient sea water whereas water hotter than ∼9°C shows a decreasing trend with temperature to zero 238 U at ∼29°C. 210 Pb concentration in Mussel Bed increases with temperature, and extrapolated to ∼350°C yields a 210 Pb concentration considerably less than that expected from 222 Rn decay and basalt alteration.