Rocas Metamórficas.  The process in which an existing rock is changed by heat or pressure—or both— is called metamorphism.  El proceso en el cual una.

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Transcripción de la presentación:

Rocas Metamórficas

 The process in which an existing rock is changed by heat or pressure—or both— is called metamorphism.  El proceso en el cual una roca existente es cambiada por el calor o presión-o ambo-se llama metamorfismo.

 The original sedimentary or igneous rock is called the parent rock.  La roca sedimentaria o ígnea original se llama la roca de padre.  The resulting rock is a metamorphic rock.  La roca resultante es una roca metamórfica.

 Even a metamorphic rock can be a parent rock for another type of metamorphic rock.  Incluso una roca metamórfica puede ser una roca de padre para otro tipo de roca metamórfica.

 Limestone is the parent rock of marble.  La piedra caliza es la roca de padre del mármol.

 Shale can be the parent rock of schist.  La pizarra puede ser la roca de padre del esquisto. Shale

 One type of change occurs when pressure causes a rock’s minerals to flatten out in one direction.  Un tipo de cambio ocurre cuando la presión hace los minerales de una roca aplanar hacia fuera en una dirección.

 Heat and pressure can break the bonds that join atoms in minerals. Then the atoms can join together differently as new bonds form.  El calor y la presión pueden romper los enlaces que ensamblan los átomos en minerales. Entonces los átomos pueden ensamblar juntos diferentemente como nueva forma de los enlaces.

 Individual mineral crystals can grow larger as more atoms join their crystal structures.  Los cristales minerales individuales pueden crecer más grandes mientras que más átomos ensamblan sus estructuras cristalinas.

 Atoms can combine in different ways, and new minerals can form in place of older ones.  Los átomos pueden combinar en maneras diferentes, y los nuevos minerales pueden formar en lugar los más viejos. Garnet forms from Shale

 The types of metamorphic changes that occur depend on the types of parent rocks and the conditions of temperature and pressure.  Los tipos de cambios metamórficos que ocurran dependen de los tipos de rocas de padre y de las condiciones de la temperatura y de la presión.

 When both high temperature and high pressure are present, metamorphic changes can occur over very large areas. When only one of these conditions is present, changes tend to occur over smaller areas.  Cuando la temperatura alta y la alta presión están presentes, los cambios metamórficos pueden ocurrir sobre mismo áreas extensas. Cuando solamente uno de estas condiciones está presente, los cambios tienden a ocurrir sobre áreas más pequeñas.

 Generally, the deeper below the surface the rocks are, the greater the metamorphic changes that occur in them.  Generalmente, el más profundos debajo de la superficie las rocas son, mayores son los cambios metamórficos que ocurren en ellos.

 Magma or lava heats the rock it is in contact with, causing recrystallization.  El magma o la lava calienta la roca que está en contacto con, causando la recristalización.  Recrystallization animation Recrystallization animation

 A common property of metamorphic rocks is Foliation, an arrangement of minerals in flat or wavy parallel bands.  Una característica común de rocas metamórficas es la foliación, un arreglo de minerales en vendas paralelas planas u onduladas.

Slate Gneiss

 Nonfoliated rocks - a metamorphic rock may not display foliation if it is made up mainly of one type of mineral.  Nonfoliated oscila - una roca metamórfica puede no exhibir la foliación si se compone principalmente de un tipo de mineral.

MarbleQuartzite

 Another reason that a metamorphic rock may lack foliation is that it has not been subjected to high pressure.  Otra razón que una roca metamórfica puede carecer la foliación es que no se ha sujetado a la alta presión.

 Hornfels often forms when magma or lava touches other rock, is nonfoliated.  Hornfels forma a menudo cuando el magma o la lava toca la otra roca, nonfoliated.