How can a sedimentary rock become an igneous rock and also a metamorphic rock?

Question

describe the process

Answer 1

a metamorphic rock is a rock that has been changed chemically or recrystallised by great heat , pressure or chemical action inside the Earth. some are formed when hot magma comes into contact with existing rocks.

heat and pressure can turn limestone into marble and sandstone into quartzite

Answer 2

Simply put:

As a sedimentary rock is buried deeper, it is exposed

to more heat and pressure.

If it melts partially and fuses it becomes metamorphic rock.

If it melts completely, and then cools, (by rising),

it is now igneous rock.

Answer 3

A sedimentary rock cannot become an igneous rock.  A sedimentary rock is formed by fine particles of sand being pressed into rock by great pressure.

Igneous rock is formed when molten rock cools. Basalt is one example where crystallization didn't occur.  Granite is an example of crystallization.  

Metamorphic rock is formed when rocks are subjected to great heat and pressure which changes their basic structure, generally the individual particles of a sedimentary rock are fused in such a way that the individual particles cannot easily be determined.

Answer 4

If a sedimentary rock is heated until it begins to partially melt, you will get a migmatite which is a mixture of high grade metamorphic rock and plutonic igneous rock.

Answer 5

A sedimentary rock can become deeply buried due to tectonic processes.  At this deeper level, the rock becomes molten (magma) due to the higher heat.  It expands due to the heat, becomes less dense and then rises.  If it cools beneath the surface of the earth, it solidifies to form intrusive igneous rock.  If it breaks the surface of the earth as it does in volcanic eruptions, it solidifies to form extrusive igneous rock.

A sedimentary rock can be deeply buried and be subjected to extreme heat and pressure.  These rocks are physically deformed and chemically changed due to different temperatures and pressures. The elements in the minerals can actually "move" to form new minerals. The rock does not melt, or else it would be considered an igneous rock. A rock looks different after it has been metamorphosed. The rocks texture and overall appearance changes also.