General Geology please short answer Compare and contrast layering in sedimentary

Question

General Geology

please short answer

Compare and contrast layering in sedimentary and metamorphic rocks. Discuss both what they look like and how they form. Explain how the growth of crystals during metamorphism occurs. How is this process different from (a) growth of crystals during the cooling of magma and (b) the growth of crystals during the deposition of chemical sediment. For each of the metamorphic rocks listed below, state the "parent rock" (i.e. what kind of rock was it before it underwent metamorphism?) quartzite marble schist phyllite

Explanation / Answer

2) layering in sedimentary and metamorphic rocks is different . the layering in sedimentary rocks is due to the deposition of sediments in layers where as the layering in metamorphic rocks is due to the parllel or linear allignment of minerals that are present in rocks due to the affect of pressure.

3) neocrystallization is the process of formation of new crystals in rocks during the process of metamorphism due to the increased temperatures.

crystal growth in metamorphic rocks is different from igneous crystal formation and deposition of chemical sediment , because in igneous rocks crystals were formed from cooling of magma. where as in metamorphic rocks the crystals grow by the alteration of the preexisting minerals.

4) for quartzite - sandstone

marble - limestone

for schist and phyllite - shale is the parent rock

with incresed grade in metamorphism, shale will turn into slate, slate will turn into phullite, and phyllite will turn into schist

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