Question 9 (10 points) Why can rocks that contain platy minerals produce foliate

Question

Question 9 (10 points) Why can rocks that contain platy minerals produce foliated textures when they metamorphose? Platy minerals are more sensitive to directed pressure than nonplaty minerals and therefore align at specific angles to applied pressure. Platy minerals dissolve under high pressure and temperature and therefore are able to re-form to produce foliations. a) b) Platy minerals are less reactive than nonplaty minerals and therefore resist changing their orientation under pressure. Platy minerals melt at low temperatures and therefore are more likely to be found in low-grade metamorphic rocks. d) Save Question 10(10 points) Partial melting is an important process in the formation of migmatites. True False Save

Explanation / Answer

9) platy minerals are more sensitive to directed pressure than nonplaty minerals therefore align at specific angles to applied pressure is the reason that contain platy minerals produced floated textures when they metamorphosed. Foliation is described as the existence or appearance of layers. Foliated textures result from a parallel arrangement of flat, platy minerals. This is usually a result of mineral recrystallization in the presence of a directed pressure. Under this condition, the mineral grains will grow in an orientation that best distributes the force of the pressure. Typically, mineral grains will grow perpendicular to the force being enacted on them.

10) yes it is true that partial melting is an important process in the formation of miniatures. It is created when a metamorphic rock such as gneiss partially melts, and then that melt recrystallizes into an igneous rock, creating a mixture of the unmelted metamorphic part with the recrystallized igneous part. They can also be known as diatexite.

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