What Does This Texture Indicate About The Formation Of This Rock??

What Does This Texture Indicate About The Formation Of This Rock??

The texture of an igneous rock is determined by the cooling history of the magma from which it formed. … Phaneritic texture describes coarse grained rocks. They are characteristic of intrusive (plutonic) rocks and have crystals that can be seen with the unaided eye. Indicates slow cooling history.

What does the texture of this rock indicate about its cooling history?

The texture of an igneous rock is determined by the cooling history of the magma from which it formed. … Phaneritic texture describes coarse grained rocks. They are characteristic of intrusive (plutonic) rocks and have crystals that can be seen with the unaided eye. Indicates slow cooling history.

Which of the following igneous rocks has a texture consistent with a magma that cooled and solidified slowly at first followed by more rapid cooling?

porphyritic texture

Other Igneous Rock Textures

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When magma cools slowly at first but then cools more rapidly as it nears Earth’s surface the igneous rock that forms may have large crystals embedded within a mass of smaller crystals. This texture is called porphyritic texture.

What does a finely crystalline or glassy igneous texture indicates?

When igneous rocks have a finely crystalline or glassy texture it indicates that they were formed by magma that cooled extremely quickly.

What rock is formed by cooling lava?

igneous rock
Extrusive or volcanic igneous rock is produced when magma exits and cools above (or very near) the Earth’s surface. These are the rocks that form at erupting volcanoes and oozing fissures.

How do cooling conditions affect texture and composition of igneous rocks quizlet?

Quickly cooling molten material will result in rocks with small mineral grains. Lava that is cools extremely rapidly will produce a glassy rock. Rocks that form as the result of different cooling rates will have both large and small mineral grains. … Igneous rocks with glassy textures form when lava cools very quickly.

What is meant by the texture of an igneous rock?

Igneous textures include the rock textures occurring in igneous rocks. Igneous textures are used by geologists in determining the mode of origin of igneous rocks and are used in rock classification. There are six main types of textures phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic.

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What texture best describes an igneous rock that formed deep underground?

Phaneritic texture is sometimes referred to as coarse-grained igneous texture. Granite the most well known example of an intrusive igneous rock has a phaneritic texture. Sometimes an intrusion of magma that is crystallizing slowly underground releases large amounts of hot water.

What is the texture of an igneous rock formed from magma?

Magmas and their resultant plutonic rock bodies cool and crystallize slowly and are characterized by coarse-grained texture in which the mineral crystals are visible to the unaided eye.

What does an igneous rock with a pyroclastic texture tell a geologist?

What does an igneous rock with a pyroclastic texture tell a geologist? The rock was likely formed by a violent volcanic eruption.

What does coarsely crystalline igneous textures indicate?

Question: QUESTION 18 Coarsely crystalline igneous textures indicate that there was a lot of gas in the magma.

What is felsic igneous rock?

In geology felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. … Felsic magma or lava is higher in viscosity than mafic magma/lava. Felsic rocks are usually light in color and have specific gravities less than 3. The most common felsic rock is granite.

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What type of rock is shown in this photograph?

45 Cards in this Set
Which of the following is NOT a mineral? All of these
Rocks are composed of: minerals
What type of rock is shown in this photograph? Crystalline rock
What type of rock is shown in this photograph? Clastic
What are the two main ways that minerals are put together in rocks? Crystalline and Clastic

How are rocks formed?

There are three main types of rocks: sedimentary igneous and metamorphic. Each of these rocks are formed by physical changes—such as melting cooling eroding compacting or deforming—that are part of the rock cycle. Sedimentary rocks are formed from pieces of other existing rock or organic material.

What is the texture of an igneous rock formed from magma that cooled slowly deep underground?

Phaneritic (phaner = visible) textures are typical of intrusive igneous rocks these rocks crystallized slowly below Earth’s surface. As magma cools slowly the minerals have time to grow and form large crystals.

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How does a vesicular texture in a volcanic rock develop?

A vesicular texture is caused when dissolved gases and other volatile components of a magma erupt from the liquid portion due to a decrease in pressure. This causes the magma to foam up and the resulting rock to be riddled with hole-like structures called vesicles.

What factor of formation most influence the texture of igneous rock?

The main factors that can affect the texture of an igneous rock are the location and cooling rate of the hot magma that forms the rock.

What factors can affect the texture of an igneous rock?

The texture in igneous rocks depends on the following four factors: i) Viscosity of magma ii) Rate of cooling iii) The order of crystallization of the constituent minerals. iv) The relative rates of growth of the constituent minerals.

What factors influences the texture of an igneous rock quizlet?

The three factors that influence the textures of igneous rocks are the speed of cooling the silicate content and the water content. The speed of cooling affects the texture because the faster the rate of cooling the smoother the rock will be (finer texture aphanitic).

What is texture in rocks?

In rock: Texture. The texture of a rock is the size shape and arrangement of the grains (for sedimentary rocks) or crystals (for igneous and metamorphic rocks). Also of importance are the rock’s extent of homogeneity (i.e. uniformity of composition throughout) and the degree of isotropy.

What is the texture of a rock quizlet?

What is a rock’s texture? It is the look and feel of the rock’s surface. Some rocks are smooth and glassy. Others are rough or chalky.

What is the meaning of texture?

Texture is the physical feel of something — smooth rough fuzzy slimy and lots of textures something in between. Sandpaper is very rough — it has a gritty rough texture. Other things like linoleum have a smooth texture. Texture has to do with how an object feels and it’s ingredients.

What process creates igneous rocks?

Igneous rocks form when magma (molten rock) cools and crystallizes either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. … When lava comes out of a volcano and solidifies into extrusive igneous rock also called volcanic the rock cools very quickly.

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Which statement best describes the formation of an intrusive igneous rock?

Which statement best describes the formation of an intrusive igneous rock? Magma solidifies slowly resulting in a coarse-grained texture.

Which statement about the formation of a rock is best supported by the Rock Cycle *?

Which statement about the formation of a rock is best supported by the rock cycle? Sediment must be compacted and cemented before it can change to sedimentary rock.

What is texture describe the Inequigranular texture of igneous rock in detail?

Inequigranular texture

(i) Porphyritic texture : When an igneous rock contains large crystals some minerals set in a matrix which is much finer grained or even glassy the texture is called “Porphyritic”. The large crystals are called “Phenocrysts” and fine grained material is called “groundmass”.

Why do igneous rocks have different textures?

Explanation: The faster the magma cools that smaller the crystals that are formed. Some magma from which the igneous rocks is form come from different combinations of remelted igneous rocks metamorphic rocks and sedimentary layers. … The different sources of the melted material affects the textures of the igneous rocks.

How do coarse grained igneous rocks form?

Intrusive igneous rock is formed when magma cools and solidifies within small pockets contained within the planet’s crust. As this rock is surrounded by pre-existing rock the magma cools slowly which results in it being coarse grained – i.e. mineral grains are big enough to be identifiable with the naked eye.

Why do igneous rocks develop interlocking texture?

Phaneritic – This texture describes a rock with large easily visible interlocking crystals of several minerals. … A phaneritic texture is developed by the slow cooling and crystallisation of magma trapped within the Earth’s crust and is characteristic of plutonic rocks.

Which igneous rocks has a pyroclastic texture?

Pyroclastic texture — rhyolite tuff: This is an extrusive rock formed by fragments of hot volcanic rock and crystals blasted out of a volcano and welded together by the heat after the particles came to rest.

Rock Textures

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