metamorphic rocks a classification and glossary of terms pdf

Metamorphic Rocks A Classification And Glossary Of Terms Pdf

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Metamorphic rock , any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in temperature , pressure , and mechanical stress , and the addition or subtraction of chemical components. The preexisting rocks may be igneous , sedimentary , or other metamorphic rocks. Metamorphism comprises changes both in mineralogy and in the fabric of the original rock.

Metamorphic rocks are broadly classified as foliated or non-foliated.

Rock (geology)

Metamorphic rocks arise from the transformation of existing rock to new types of rock, in a process called metamorphism. During this process, the rock remains mostly in the solid state, but gradually recrystallizes to a new texture or mineral composition. They may be formed simply by being deeply buried beneath the Earth's surface, where they are subject to high temperatures and the great pressure of the rock layers above. They can also form from tectonic processes such as continental collisions, which cause horizontal pressure, friction and distortion. Metamorphic rock can be formed locally when rock is heated 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 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.

Metamorphic rock

Home Alpha. Self Tests. First, the Problems. As with igneous and sedimentary rocks, metamorphic rocks are classified on the basis of texture grain size, shape, orientation and mineral composition. However, the classifiction of metamorphic rocks is more difficult to get into than with igneous and sedimentary rocks, for a couple of reasons. First, is the fact that metamorphism takes place through heat, pressure, and chemically active fluids, but there are many combinations of heat, pressure, and chemically active fluids and so there are many different responses.

A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition and the way in which it is formed. Rocks are usually grouped into three main groups: igneous rocks , sedimentary rocks and metamorphic rocks. Rocks form the Earth's outer solid layer, the crust , and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis or lithification of sediments , which in turn are formed by the weathering , transport, and deposition of existing rocks.

Lithostratigraphic units are bodies of rocks, bedded or unbedded, that are defined and characterized on the basis of their lithologic properties and their stratigraphic relations. Lithostratigraphic units are the basic units of geologic mapping. The relationship of lithostratigraphic units to other kinds of stratigraphic units is discussed in Chapter Lithostratigraphy The element of stratigraphy that deals with the description and nomenclature of the rocks of the Earth based on their lithology and their stratigraphic relations. Lithostratigraphic classification The organization of rock bodies into units on the basis of their lithologic properties and their stratigraphic relations. Lithostratigraphic unit A body of rocks that is defined and recognized on the basis of its lithologic properties or combination of lithologic properties and stratigraphic relations. A lithostratigraphic unit may consist of sedimentary, or igneous, or metamorphic rocks.

10.3 Classification of Metamorphic Rocks

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Тогда Стратмор понял, что Грег Хейл должен умереть. В ТРАНСТЕКСТЕ послышался треск, и Стратмор приступил к решению стоявшей перед ним задачи - вырубить электричество. Рубильник был расположен за фреоновыми насосами слева от тела Чатрукьяна, и Стратмор сразу же его. Ему нужно было повернуть рубильник, и тогда отключилось бы электропитание, еще остававшееся в шифровалке. Потом, всего через несколько секунд, он должен был включить основные генераторы, и сразу же восстановились бы все функции дверных электронных замков, заработали фреоновые охладители и ТРАНСТЕКСТ оказался бы в полной безопасности.

Нуматака выдержал паузу. - А если мистер Беккер найдет ключ. - Мой человек отнимет. - И что .

Metamorphic rock

Стратмор также понимал, что первым делом нужно разрядить ситуацию. Выдержав паузу, он как бы нехотя вздохнул: - Хорошо, Грег.

Metamorphic Rocks: A Classification and Glossary of Terms

 - Стратмор хмуро посмотрел на нее и двинулся к двери.  - Но будем надеяться, что он этого не узнает. ГЛАВА 76 У подъезда севильского аэропорта стояло такси с работающим на холостом ходу двигателем и включенным счетчиком. Пассажир в очках в тонкой металлической оправе, вглядевшись сквозь стеклянную стену аэровокзала, понял, что прибыл вовремя. Он увидел светловолосую девушку, помогающую Дэвиду Беккеру найти стул и сесть. Беккера, по-видимому, мучила боль. Он еще не знает, что такое настоящая боль, подумал человек в такси.

Он… он был?. - Да, убит. - Но… но это невозможно! - У немца перехватило дыхание.


Many common terms in metamorphic petrology vary in their usage and meaning between countries, and there is a range of specialized rock names that have.


Она оглянулась и застонала. У входа стоял криптограф Грег Хейл. Это был высокий мужчина крепкого сложения с густыми светлыми волосами и глубокой ямкой на подбородке. Он отличался громким голосом и безвкусно-крикливой манерой одеваться.

 Да. Взгляните. Офицер подошел к столу.

Metamorphic Rocks

3 comments

Jose L.

Next: Start your rock collection.

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Judy M.

To browse Academia.

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