Table 1

Chemical composition of the Rainbow sediment studied in this work

Major elementsRainbow sediment, %Sediment along Rainbow plume, %*
SiO22.34
Al2O30.610.56/0.53/0.46/0.67
Fe2O34.461.47/1.53/1.52/1.94
MnO0.240.05/0.06/0.08/0.1 
MgO0.95
CaO31.30
Na2O1.17
K2O0.07
TiO20.050.05/0.05/0.05/0.06
P2O50.540.07/0.07/0.08/0.09
CO2 tot32.5682.9/86.2/83.4/86.7
C org0.140.39/nd/0.0/nd
S tot0.31
  • nd, not determined. 

  • * Values from four sediment cores (0.5 cm from surface) taken at 2, 5, 10, and 25 km (2,540, 2,322, 2,363, and 2,519 m deep, respectively) from the Rainbow site following the vent plume. Data are from ref. 14