A.  Write the balanced equations for the reactions listed below:

1. The formation of diopside in a siliceous dolomite.
 
 

2. The formation of diopside in the presence of Tremolite, calcite and quartz.
 
 

3. The reaction of chlorite plus k-feldspar to form biotite plus muscovite plus quartz.
 
 

4. The reaction of iron-rich chlorite to form almandine in the presence of quartz.  Use the formula (Fe,Mg)_4.5 Al₃ Si_2.5 (OH)₈   for chlorite.  This takes into account the paired substitution of AlAl for MgSi in the chlorite formula.  The 3 Al atoms are evenly split in the +2 and the +3 sites in hornblende.
 
 

5. The formation of staurolite and chlorite in the presence of muscovite and quartz to form kyanite plus biotite.
 
 
 

B.  Give an estimate of the temperature for each of the above reactions assuming a medium P/T gradient and/or a high P/T gradient.
 

C.  Will all reactions occur under conditions of both geothermal gradients?  Explain,