Metamorphic rocks can be formed from any pre-existing rock type (igneous, sedimentary, or other metamorphic rocks) that undergoes intense heat, pressure, or chemical changes without melting. This process causes the minerals in the rock to recrystallize and reorganize, resulting in a new metamorphic rock with different properties.
== == Metamorphic rocks can be found at great depths within the Earth's crust, at the base of mountains, or in contact zones where plutonic intrusions have metamorphosed the host rock via high temperatures. Metamorphic rocks can indeed be found at great depths within the crust, but for a rockhound, finding them elsewhere is not a problem. Areas that have experienced previous glaciation (as far south as Central Illinois in the last period of glaciation) are full of metamorphic erratic rocks, transported and dropped by the ice. Visitors to Colorado can find an abundance of metamorphic rocks in the eroded Rocky Mountains, many dating to the Pre-Cambrian. Californians, too can collect meta's in eroded mountains and in formations such as the San Onofre Breccia. No glaciation? Look around eroded mountains.
Limestone is typically the product of accumulated decomposed marine life as it settles to the bottom of a body of water.This sedimentary rock, laid down in earlier geological ages, is the starting material for marble.When limestone is exposed to geological pressure and heat, it changes (metamorphosizes) into marble.The metamorphic stone known as marble is highly alkaline, like limestone, but is far less porous (permeable), and much denser and harder.Marble quarries are areas of the earth that were once sea bottoms, then were exposed, through tectonic plate activity, to great heat and pressure.
Igneous rocks formed from large masses of magma solidifying far below Earth's surface typically have a coarse-grained texture. This is because the slower cooling process allows larger mineral crystals to form within the rock.
Igneous rocks, such as granite or diorite, are formed when large masses of magma solidify far below Earth's surface. These rocks have a coarse texture due to the slow cooling process, allowing large mineral crystals to form.
Metamorphic rocks can be formed from any pre-existing rock type (igneous, sedimentary, or other metamorphic rocks) that undergoes intense heat, pressure, or chemical changes without melting. This process causes the minerals in the rock to recrystallize and reorganize, resulting in a new metamorphic rock with different properties.
Probably that they are sedimentary. =] They are made of sediments, and, unlike igneous and metamorphic rocks, are so far unaffected by magma/lava.
== == Metamorphic rocks can be found at great depths within the Earth's crust, at the base of mountains, or in contact zones where plutonic intrusions have metamorphosed the host rock via high temperatures. Metamorphic rocks can indeed be found at great depths within the crust, but for a rockhound, finding them elsewhere is not a problem. Areas that have experienced previous glaciation (as far south as Central Illinois in the last period of glaciation) are full of metamorphic erratic rocks, transported and dropped by the ice. Visitors to Colorado can find an abundance of metamorphic rocks in the eroded Rocky Mountains, many dating to the Pre-Cambrian. Californians, too can collect meta's in eroded mountains and in formations such as the San Onofre Breccia. No glaciation? Look around eroded mountains.
If any kind of rock-igneous or sedimentary- is far enough beneath the surface, the pressure can change it into a metamorphic rock. Also heat - the effects differ. It doesn't have to be ever so deeply buried, geologically, since metamorphism is usually a orogenic process in the affected sedimentary rock.
the earth's crust is 2100 ki. down the earth.
If any kind of rock-igneous or sedimentary- is far enough beneath the surface, the pressure can change it into a metamorphic rock. Also heat - the effects differ. It doesn't have to be ever so deeply buried, geologically, since metamorphism is usually a orogenic process in the affected sedimentary rock.
If any kind of rock-igneous or sedimentary- is far enough beneath the surface, the pressure can change it into a metamorphic rock. Also heat - the effects differ. It doesn't have to be ever so deeply buried, geologically, since metamorphism is usually a orogenic process in the affected sedimentary rock.
In some cracks in the rocks and in hydrothermal springs, yes. But not down to the point where magma is present as magma is far too hot to sustained any form of life on earth.
Because people have been far down and we have special tools to see down into the earth.
The origin of the heat that creates metamorphic rock can be from friction caused by colliding plates, but by far the vast majority of the heat has originated in Earth's interior, caused by radioactive decay, remnant heat from Earth's formation, and pressure. And butt trolol
Limestone is typically the product of accumulated decomposed marine life as it settles to the bottom of a body of water.This sedimentary rock, laid down in earlier geological ages, is the starting material for marble.When limestone is exposed to geological pressure and heat, it changes (metamorphosizes) into marble.The metamorphic stone known as marble is highly alkaline, like limestone, but is far less porous (permeable), and much denser and harder.Marble quarries are areas of the earth that were once sea bottoms, then were exposed, through tectonic plate activity, to great heat and pressure.
Because of the cascades there are a lot of igneous and metamorphic rocks. Oregon caves is a great example of metamorphic rocks. It is made from marble. I would expect mostly sedimentary and some metamorphic rocks near the ocean since it is fairly far from the cascade range. The volcanoes there are some of the most active. They are responsible for much mineralization due to heat, hydrothermal vents and lava flows. I don't know Oregon very well except the extreme southwest. You would probably do better in the geology section.