2000- 



«? 



in 



o 



E 



3. 



1000- 





+ 



o o ++ 

 o 00 



+ 



+ 



$ o 



10 



T 



A 



20 30 



Mg mmoles/kg 



<y> <** 



40 



50 



2000 



o 



E 



CJ 



1000- 



400 



Temperature (°C) 



Figure 5. Iron vs. magnesium (top), and iron vs. temperature (bottom) for 



samples collected at the East Pacific Rise, 21 *N in 1981. SW, NGS, OBS, 

 and HG are different vent fields at the 21 'N site. Data from Von Damm 

 (1983) and replotted here courtesy of Karen Von Damm. 



45 



