Answer:
Rocks containing specific minerals on the chart can be associated with specific tectonic situations, times, and places in the geological history of the area.
Explanation:
Metamorphic facies are arrangements or groups of metamorphic minerals that are formed under the same pressure and temperature. The arrangement has specific conditions according to the area with a certain temperature and pressure. The boundaries between facies (and the corresponding areas on the temperature vs pressure graph) are very broad because they are approximate and gradational boundaries. The areas on the chart with the lowest temperature and pressure values are in the range of sedimentary rock formations, and as opposed to metamorphic rocks, in a process called diagenesis.
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