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Metamorphic rock is the result of the transformation of an existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat and pressure (temperatures greater than 150 to 200 °C and pressures of 1500 bars) causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies). They may be formed simply by being deep beneath the Earth's surface, subjected to high temperatures and the great pressure of the rock layers above it. They can form from tectonic processes such as continental collisions, which cause horizontal pressure, friction and distortion. They are also formed when rock is heated up by the intrusion of hot molten rock called magma from the Earth's interior. The study of metamorphic rocks (now exposed at the Earth's surface following erosion and uplift) provides us with very valuable information about the temperatures and pressures that occur at great depths within the Earth's crust. Some examples of metamorphic rocks are gneiss, slate, marble, schist, and quartzite. From Wikipedia under the
GNU Free Documentation License New Ask-a-Geologist Question: Metamorphic Foliation | Mini Me ...
tracyb ue, 25 Aug 2009 12:56:16 GM Question: What term is used for . metamorphic. rock with banded texture? AFL Pinnacle Sigs
metamorphic Mac Fri, 14 Aug 2009 14:40:23 GM Got a few bits of mail over the last 2 weeks: Attached Thumbnails. Click image for larger version Name: sigs.jpg Views: N/A Size Click image for larger version Name: sigs back.jpg Views: N/A. metamorphic petrology.
Mandy Wed, 29 Jul 2009 16:17:00 GM mineralogy pleochroism igneous rocks alkali feldspar phenocrysts reading the whole practical book for labs tomorrow, forty pages of unknown terms like above makes me go dumb dumb. & i'll wake up later on not remembering a single word. ... From Google Blog Search: "Metamorphic" What are two factors that can produce metamorphic rocks? Q. What are two factors that can produce metamorphic rocks? Asked by imsexxxy - Tue Sep 23 21:03:20 2008 - - 3 Answers - 0 Comments A. To answer your question, the word metamorphic pertains to rock that has gone under metamorphosis. Now just click on the dictionary and you'll find out what metamorphosis means! Answered by Curiously, really? - Tue Sep 23 21:14:35 2008 How can all 3 rock types, igneous, sedimentary and metamorphic rocks all be found on 1 mountain? ? Q. How can all the 3 basic rock types, igneous, sedimentary and metamorphic rocks all be found on 1 mountain? Asked by unknownspy.uk33 - Mon Jan 19 11:30:12 2009 - - 5 Answers - 0 Comments Metamorphic rocks and where they come from?
Q. Where do metamorphic rocks originate? How are they formed? What are the two categories of metamorphic rocks? What are the distinguishing characteristics between the two categories of rocks? Asked by lilbits - Fri Sep 26 16:29:58 2008 - - 1 Answers - 0 Comments A. A metamorphic could be from any type of rock, including another metamorphic rock. They generally form extreme and pressure. There are foliated and unfoliated. Foliation is the property a rock has if its minerals are banded. If the minerals are not banded, they are foliated. Example of a foliated rock: Gneiss Answered by theARTSlover003 - Fri Sep 26 16:40:57 2008 From Yahoo Answer Search: "Metamorphic" |


