Metamorphic textures are defined by the size and shape of the mineral grains tha
ID: 152416 • Letter: M
Question
Metamorphic textures are defined by the size and shape of the mineral grains that make up the rock as well as the spatial relationships between the grains.
The textures can be divided into rocks that are foliated and those that are nonfoliated.
Foliated metamorphic rocks show signs that their minerals have been reoriented into layers.
Minerals in nonfoliated metamorphic rocks have no orientation.
When a rock is metamorphosed and its initial textures remain visible, it is said to have undergone low-grade metamorphism.
Rocks whose layering and other characteristic textures have been obliterated have undergone high-grade metamorphism.
This Gigapan image shows a dark metamorphic rock in contact with a lighter igneous rock (granite). Review the statements below, and determine which are correct about the dark metamorphic rock on the left in the Gigapan image.
Select all that apply.
A.) The metamorphic rock has undergone high-grade metamorphism. B.) The metamorphic rock shows foliation. C.) The metamorphic rock shows no foliation. D.) The metamorphic rock has undergone low-grade metamorphism.Explanation / Answer
A) The metamorphic rock has undergone high-grade metamorphism
B) The metamorphic rock shows foliation
Explanation - High grade metamorphic rock appears very solid. All the minerals melted and compressed together. If we see the given image, this condition is true.