Metamorphic Rocks A metamorphic rock is…. Formation of Metamorphic Rocks Metamorphism – or the process of making metamorphic rock – takes place within.

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Metamorphic Rocks How a little bit of heat & pressure transform rocks!

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Presentation transcript:

Metamorphic Rocks A metamorphic rock is…

Formation of Metamorphic Rocks Metamorphism – or the process of making metamorphic rock – takes place within the lithosphere. Contact Metamorphism – The metamorphism of rock that… Regional Metamorphism - The metamorphism of rock that is associated with…

Contact Metamorphis m Contact Metamorphism will occur in rock that… The rock that the magma or lava flows across will be changed due to an increase in temperature and its reactions with the liquified minerals in the magma/lava. Zone of contact metamorphism A gabbro (igneous) intrusion can be seen above (black-colored rock). The surrounding gray rock is limestone. A thin layer of marble (white-colored rock) can be found between the two types of rocks. The marble formed as a result of contact metamorphism.

Regional Metamorphis m The Himalayan Mountains were created through motions within the Earth’s lithosphere. These motions created a great deal of heat and pressure in the rock transforming the rock through regional metamorphism. Regional Metamorphism will occur in rock that is subjected to the intense…

Types of Metamorphic Rocks Foliated Metamorphic Rock Foliated metamorphic rock contains layers of minerals that have recrystallized due to exposure to high heat and high pressure. Foliated rocks are… These layers of recrystallized minerals can be seen as bands. Most foliated metamorphic rocks are made up of several minerals. SLATE: fine-grained crystalsSCHIST: medium-grained crystals GNEISS: coarse-grained crystals The more heat and pressure associated with regional metamorphism, the more minerals will recrystallize and realign into bands within a metamorphic rock.

Types of Metamorphic Rocks Nonfoliated Metamorphic Rock Nonfoliated metamorphic rocks do not contain layers of minerals. Minerals within these rocks are interconnected due to exposure to high heat but not as high pressure. Nonfoliated rocks are… Bands are NOT present in nonfoliated metamorphic rock. Nonfoliated metamorphic rocks can be made up of one mineral or several minerals. The high heat and pressure have caused the pebbles in this METACONGLOMERATE to “stretch”. The QUARTZITE and MARBLE lack bands associated with foliated rocks. Both metamorphic rocks formed from one mineral (quartz) or a monomineralic rock (limestone).

Identification of Metamorphic Rocks RT = Pg. 7 “Which metamorphic rock would react with hydrochloric acid?” “Which foliated, metamorphic rock is medium grained and contains platy mica crystals?”