5.11 Questions

Discontinuous reactions questions. If you did not complete the identifying reactions activity by pressing the "Test Yourself" button in the Recognizing Reactions section, press the button below to confirm that you know how to use ternary phase assemblage diagrams to identify possible discontinuous chemical reactions.



Continuous reactions questions. Use the interactive AFM diagram in Figure 24 to help you answer the following questions:

At 610°C, what is the Mg number (Mg# = Mg/(Mg+Fe)) at equilibrium for the biotite in the rock with the bulk composition identified by the red dot?

Between 560°C and 597°C, at equilibrium the rock with the bulk composition identified by the red dot consists of the minerals Qz, Mu, Bt, Grt, and Chl. As the temperature is raised from 560°C to 597°C, how do the the Mg numbers of the minerals change?

Pick one. Then press
Bi:    Bi Mg# decreses Bi Mg# stays the same Bi Mg# increases