What Are The Two Main Categories Of Metamorphic Texture?


What Are The Two Main Categories Of Metamorphic Texture??

TEXTURES Textures of metamorphic rocks fall into two broad groups FOLIATED and NON-FOLIATED.

What are the two main categories of metamorphic texture quizlet?

The two major types of texture in metamorphic rocks are foliated rocks which indicate an alignment of platy minerals and nonfoliated (granular) rocks which have no preferred alignment of minerals (may indicate a lack of platy minerals).

What are the categories of metamorphic rock?

Common metamorphic rocks include phyllite schist gneiss quartzite and marble. Foliated Metamorphic Rocks: Some kinds of metamorphic rocks — granite gneiss and biotite schist are two examples — are strongly banded or foliated.

What are the 2 characteristics that metamorphic rocks are classified by?

As with igneous and sedimentary rocks metamorphic rocks are classified on the basis of texture (grain size shape orientation) and mineral composition.

Is quartzite contact or regional metamorphism?

Metamorphic rocks produced by contact metamorphism are not foliated as the major factor here involves heat rather than pressure.
Summary Chart of Common Metamorphic Rocks Original Rocks sandstone
Metamorphic Equivalent quartzite
Foliated? no
Metamorphism regional & contact

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Which type of plate boundary most commonly produces metamorphism?

Contact metamorphism is common at both convergent and divergent plate boundaries in areas where molten rock is produced. Regional metamorphism largely occurs at convergent plate boundaries.

What two metamorphic rocks are composed predominantly of single minerals?

What two metamorphic rocks are composed predominantly of single minerals? Muscovite biotite and chlorite are common minerals found in phyllites and schists.

Which are the two agents that are necessary in the formation of metamorphic rocks?

heat and pressure are the two agents that are necessary in the formation of metamorphic rocks.

What two processes cause igneous rocks to change into metamorphic rocks?

Metamorphic rocks: form by recrystallization of either igneous or sedimentary rocks. This happens when the temperature pressure or fluid environment change and a rock changes its form (e.g. limestone turns to marble). The range of temperatures for metamophism is 150C up to the melting temperature.

What are the two primary metamorphic textures we use to classify metamorphic rocks?

TEXTURES Textures of metamorphic rocks fall into two broad groups FOLIATED and NON-FOLIATED. Foliation is produced in a rock by the parallel alignment of platy minerals (e.g. muscovite biotite chlorite) needle-like minerals (e.g. hornblende) or tabular minerals (e.g. feldspars).

How are metamorphic rocks classified identify the characteristics of each of these classifications?

Metamorphic rocks are classified as either foliated or non-foliated. Foliated rocks have layers of mineral grains. Non-foliated rocks have little or no layering. … One rock can become many different types of metamorphic rock depending on the heat temperature and fluid conditions during metamorphosis.

Which characteristic is one of the three main characteristics used to classify igneous rocks?

Igneous rocks are classified on the basis of texture and composition. Texture refers to the size shape and arrangement of the mineral grains or crystals of which the rock is composed.

What are the three types of metamorphism?

Three types of metamorphism exist: contact dynamic and regional. Metamorphism produced with increasing pressure and temperature conditions is known as prograde metamorphism.

What are the main factors of contact metamorphism?

Contact metamorphism occurs due to heating with or without burial of rocks that lie close to a magma intrusion. It is characterized by low P/T gradients as strong thermal gradients between an intruding magma and adjacent country rock are best established at shallow crustal levels.

Is Marble regional or contact metamorphism?

Type Metamorphic Rock
Metamorphic Type Regional or Contact
Metamorphic Grade Variable
Parent Rock Limestone or Dolostone
Metamorphic Environment Variable grade regional or contact metamorphism along a convergent plate boundary

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Which are the two most familiar and widely used metamorphic rocks?

The two most familiar and widely used metamorphic rocks are marble and slate.

Which type of plate boundary most commonly produces metamorphism quizlet?

Metamorphic rocks formed near the surface and within an oceanic-continental convergent plate boundary zone result from low temperature and high pressure conditions. Higher temperatures and pressures existing at depth within such plate boundaries produce higher grades of metamorphism in a descending oceanic plate.

What is metamorphism mention the types of metamorphism?

New minerals grow but the rock does not appear to be metamorphosed. The main minerals produced are often the Zeolites. Burial metamorphism overlaps to some extent with diagenesis and grades into regional metamorphism as temperature and pressure increase. Shock Metamorphism (Impact Metamorphism)

What are the two most basic conditions to form metamorphic rocks?

The conditions required to form a metamorphic rock are very specific. The existing rock must be exposed to high heat high pressure or to a hot mineral-rich fluid. Usually all three of these circumstances are met.

Which of the following is an example of a metamorphic rock with a Nonfoliated texture?

Some examples of non-foliated metamorphic rocks are marble quartzite and hornfels. Marble is metamorphosed limestone. When it forms the calcite crystals tend to grow larger and any sedimentary textures and fossils that might have been present are destroyed.

Which of the following igneous rocks exhibit Aphanitic texture?

Basalt is the aphanitic or fine-grained equivalent of gabbro.

Which are the two agents that are necessary in the formation of metamorphic rocks quizlet?

Existing rocks are buried and forced toward the mantle increasing heat and pressure. This is the first step in the formation of metamorphic rocks. Magma pockets rise which increases heat and minerals change due to temperature and pressure.

Which is one of the main categories of sedimentary rocks?

There are three different types of sedimentary rocks: clastic organic (biological) and chemical. Clastic sedimentary rocks like sandstone form from clasts or pieces of other rock.

Which two processes causes sand particles to form sandstone?

The sandstone is formed by sedimentation compaction and cementation of 50-g of sand particles.

What is the difference between composition and texture?

Composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock (the two are obviously related). Texture refers to the size and arrangement of the minerals or grains that make up a rock.

What two processes can change sedimentary rock into metamorphic rock quizlet?

Through weathering and erosion. How does Sedimentary Rock become Igneous Rock? First it become Metamorphic Rock through heat and pressure. Then the Metamorphic Rock becomes Magma through melting.

How does metamorphic rock change into another type of metamorphic rock?

Metamorphic rocks are formed by tremendous heat great pressure and chemical reactions. To change it into another type of metamorphic rock you have to reheat it and bury it deeper again beneath the Earth’s surface.

How are metamorphic textures described?

Metamorphic texture is the description of the shape and orientation of mineral grains in a metamorphic rock. Metamorphic rock textures are foliated non-foliated or lineated are described below.

What is the basis for classifying minerals into two main groups?

All minerals however can be classified into two main groups—silicate minerals and nonsilicate minerals—based on the chemical compositions of the minerals.

How do Geologists classify metamorphic rocks?

How do geologists classify metamorphic rocks? … Extreme pressure squeezes rock so tightly that the mineral grains may line up in flat parallel layers. Geologists classify metamorphic rocks. according to the arrangement of the grains that make up the rocks.

How are metamorphic rocks classified quizlet?

How are metamorphic rocks classified? Metamorphic rock is classified by texture and composition. The texture can be foliated or nonfoliated.

What are the characteristics of metamorphic rocks?

Metamorphic rocks were once igneous or sedimentary rocks but have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth’s crust. They are crystalline and often have a “squashed” (foliated or banded) texture.

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What characteristics of a metamorphic rock is determined primarily by its parent rock?

What characteristic of a metamorphic rock is determined primarily by its parent rock? overall chemical composition. The metamorphic rock texture in which mineral grains are arranged in planes or bands.

What are two properties that igneous rocks are classified by?

Texture and composition are two characteristics used to classify igneous rocks. Texture describes the appearance based on its size shape and the arrangement of its interlocking crystals. The composition classes of igneous rocks are based on the proportions of light and dark minerals in the rock.

Metamorphism – 2 | Metamorphic Textures | Geology Concepts

Metamorphic Textures

metamorphic texture and classification

30 Metamorphic Textures part I

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