Date: Summarize the relationship between mineral alignment and type of metamorph

Question

Date: Summarize the relationship between mineral alignment and type of metamorphism by checking the appropriate box(es) in each row in the following table. (a) Texture Foliation Lineation Granoblastic with micas Type of metamorphism Contact Regional Dynamic Burial Can't tell from texture alone Granoblastic without micas Compositionally layered but not foliated Compositionally layered and foliated (b) Examine the metamorphic rocks in your study set. Which are foliated? Lineated? Granoblastic? Write your answers in the appropriate column of the study sheets at the end of the chapter. Suggest, wherever possible, the type of meta- morphism that produced each sample.

Explanation / Answer

Foliation : Regional and dynamic metamorphism(Foliation is common in rocks affected by the regional metamorphic compression typical of areas of mountain belt formation (orogenic belts)

Lineation: regional and dynamic both

granoblastic with mica: contact metamorphism

granoblastic without mica: contact metamorphism

compositionally layered but not folliated: burial metamorphism

compositionally layered but folliated:regional metamorphism

2.

foliated rocks : Slate, schist, and gneiss (due to regional and dynamic metamorphism)

lineated rocks  Slate, schist, and gneiss (but elongated minerals) (due to regional and dynamic metamorphism)

granoblastic: quartzite, marble and other non-foliatedmetamorphic rocks without porphyroblasts (due to contact metamorphism)

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