Passage V

The mineral sets (groups of two or more minerals) in a rock can provide clues to the pressure and temperature conditions under which the rock was formed. The figure shows the pressure, in kilobars (kb), and temperature relationships of six minerals (A, B, C, D, E, and F). As temperature and/or pressure changes, one mineral may react to form another. A given mineral is present only along its respective line and in the field on one side of the line.

27. Starting from Point Z on the figure (200°C and 2.5 kb), if the temperature were slowly raised by 200°C, and then the pressure slowly raised by 1 kb, the mineral set that is present would change from:

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

Note that in the title, first raise the temperature and regenerate the high pressure. According to the data sequence, find out that the trajectory of the Z movement has passed through the ACE, ADE, and ADF areas.