400 



200 





160 



O 



u 



< 

 I- 

 a 



100 



120 140 



Si. mM 



160 



Figure 6. Methane and Total CO2 versus Si relationships for 

 samples collected from Pele's Vent during the Alvin dive 

 expedition. The linear regression analyses were: 



CH y 



5.82 + 5.60Si and C0 2 = -23.95 + 0.252Si 



209 



