METMORPHIC ROCKS

STRUCTURESTEXTURES

MINERALOGY

«ANTICLINALES Y SINCLINALES» EN ROCAS METAMORFICAS

DETALLES DEL METAMORFISMO

ESQUISTO:con biotita y estaurolita

SERPENTINITA

GNEISS

MILONITA

METAESQUISTO

• A low-grade metamorphic rock that frequently contains green minerals such as chlorite, epidote and talc.

ROCAS METAMORFICAS: intrusivo abajo derecha,

FACIES METAMORFICA

HORNFELS IS A FINE-GRAINED NONFOLIATED METAMORPHIC ROCK WITH NO SPECIFIC COMPOSITION. IT IS PRODUCED BY CONTACT METAMORPHISM. HORNFELS IS A ROCK THAT WAS "BAKED" WHILE NEAR A HEAT SOURCE SUCH AS A MAGMA CHAMBER, SILL OR DIKE.

Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or mudstone by low-grade regional

metamorphism. The specimen shown above is about two inches (five centimeters) across.

Phyllite is a foliate metamorphic rock that is made up mainly of very fine-grained mica. The surface of phyllite is typically lustrous and sometimes

wrinkled. It is intermediate in grade between slate and schist. The specimen shown above is about two inches (five centimeters) across.

Schist is metamorphic rock with well developed foliation. It often contains significant amounts of mica which allow the rock to split into thin pieces. It is a rock of intermediate metamorphic grade between phyllite and gneiss. The specimen shown above is a "chlorite schist" because it contains a significant

amount of chlorite. It is about two inches (five centimeters) across.

Foliated metamorphic rock: gneiss

NO FOLIATED ROCK: MARBLE

ROCAS METAMORFICAS:procedencias