What factors influence 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).
How is the texture of igneous rocks?
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. The six main types of textures are phaneritic, aphanitic, porphyritic, glassy, pyroclastic, and pegmatitic.
What factors affect the kind of igneous rock?
The type of igneous rocks that form from magma is a function of three factors: the chemical composition of the magma; temperature of solidification; and the rate of cooling which influences the crystallization process.
What is the dominant factor that controls the texture of an igneous rock?
What is the main factor that determines the texture of an igneous rock? The cooling history is the main factor. A rock that cools slowly has time to build large crystals. A rock that cools quickly may form small crystals or even small glass.
What two factors affect the type of igneous rock that is formed?
The two major factors that influence the creation of igneous rocks are the original rock that was melted and the cooling history of the molten rocks.
Why do igneous rocks have different textures quizlet?
What affects the texture of an igneous rock? The texture of an igneous rock is determined by the cooling history of the magma from which it formed. Magmas that cool slowly form large crystals, and those that cool quickly form small crystals. Define phaneritic texture.
What are the factors explaining texture?
Explanation: The term texture is defined as the mutual relationship of different mineralogical constituents in a rock. It is determined by the size, shape and arrangement of these constituents within the body of the rock.
What are the textures and structures found in igneous rocks?
The rapid cooling of lava/melt molten rock on the surface of the Earth produces fine grained minerals or glass. The igneous rocks vary in grain size from very coarse, medium to fine grained or even glassy in hand specimen and under the microscope. Thus, igneous rocks display variety of textures.
What are the two major factors that influence the way an igneous rock will form?
The two major factors that influence the creation of igneous rocks are the original rock that was melted and the cooling history of the molten rocks. The original rock could be any initial rock.
What are the differences in the textures of igneous rocks?
Texture is comprised of grains, and there are a few main types of igneous rock grains: Equant grains are those with boundaries of equal lengths; rectangular tablet shapes are known as tabular grains; acicular grains are slender crystals; long fibers are known as fibrous grains, and a grain that is prismatic is one that …
Which are the 4 types of texture for igneous rocks?
Igneous Rock Textures
- COARSE GRAINED TEXTURE (PHANERITIC), mineral grains easily visible (grains several mm in size or larger)
- B) FINE GRAINED TEXTURE (APHANITIC), mineral grains smaller than 1mm (need hand lens or microscope to see minerals)
- C) PORPHYRITIC TEXTURE (MIXED FINE AND COARSE)
What are the two factors that help to identify igneous rocks?
What an igneous rock looks like is determined by two things. One is the composition of the magma. The other is how fast the magma cools. The rate of cooling determines the texture of the rock.
What are the 3 main characteristics of igneous rock?
Igneous rocks contain three essential sources of information: their minerals, their overall chemical composition, and their igneous texture. Igneous rock names are based on specific combinations of these features.
What feature of an igneous rock will tell you the texture quizlet?
The texture of an igneous rock is determined by the cooling history of the magma from which it formed. Magmas that cool slowly form large crystals, and those that cool quickly form small crystals.
What causes vesicular texture igneous rock?
Extrusive Igneous Rocks: Quick cooling means that mineral crystals don't have much time to grow, so these rocks have a very fine-grained or even glassy texture. Hot gas bubbles are often trapped in the quenched lava, forming a bubbly, vesicular texture.
What determines the texture of a rock?
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 are the structure and texture of igneous rock?
An igneous rock is any crystalline or glassy rock that forms from cooling of a magma. A magma consists mostly of liquid rock matter, but may contain crystals of various minerals, and may contain a gas phase that may be dissolved in the liquid or may be present as a separate gas phase.
What is the texture of an igneous rock formed from magma?
The magma, called lava when molten rock erupts on the surface, cools and solidifies almost instantly when it is exposed to the relatively cool temperature of the atmosphere. Quick cooling means that mineral crystals don't have much time to grow, so these rocks have a very fine-grained or even glassy texture.
What factors can affect the texture of a sedimentary rock?
Textures of Sedimentary Rocks
- The strength of the wind or water currents that carry and deposit the sediment. …
- The distance transported or time in the transportation process. …
- Biological activity with the sediment prior to diagenesis. …
- The chemical environment under which diagenesis occurs.
Apr 17, 2013
What factors affect the type of igneous rock that is formed from cooling magma?
The two major factors that influence the creation of igneous rocks are the original rock that was melted and the cooling history of the molten rocks.
What are the three igneous rock textures?
Igneous Rock Textures
- COARSE GRAINED TEXTURE (PHANERITIC), mineral grains easily visible (grains several mm in size or larger)
- B) FINE GRAINED TEXTURE (APHANITIC), mineral grains smaller than 1mm (need hand lens or microscope to see minerals)
- C) PORPHYRITIC TEXTURE (MIXED FINE AND COARSE)
How is the texture of an igneous rock related to the rate at which it cooled?
There are two fundamental properties of igneous rocks that are used to assign a name. Texture — the size of the crystals can be crudely related to the rate of cooling. The higher the rate of cooling the smaller the size of the crystals.
What two properties are used to characterize igneous rocks?
Two main characteristics are used to classify igneous rocks: 1) texture (the size of the mineral grains in the rock; and 2) composition (often determined by what the actual minerals are).
What are the four major characteristics of igneous rocks?
Answer
- Normally contains no fossils.
- Rarely reacts with acid.
- Usually has no layering.
- Usually made of two or more minerals.
- May be light or dark colored.
- Usually made of mineral crystals of different sizes.
- Sometimes has openings or glass fibers.
- May be fine-grained or glassy (extrusive)
Apr 26, 2018
Which of the following textures is characteristic of an intrusive igneous rock?
Intrusive rocks have a coarse grained texture. Extrusive Igneous Rocks: 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.
What environmental condition affects the texture of igneous rock?
Texture of igneous rocks defines the shape, size and mutual relationship of the constituent minerals. 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.
What factors influence the texture of sediments?
Textures of Sedimentary Rocks
- The strength of the wind or water currents that carry and deposit the sediment. …
- The distance transported or time in the transportation process. …
- Biological activity with the sediment prior to diagenesis. …
- The chemical environment under which diagenesis occurs.
Apr 17, 2013
How is a igneous rock formed?
Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.
What characteristics are used to identify igneous rocks?
Two main characteristics are used to classify igneous rocks: 1) texture (the size of the mineral grains in the rock; and 2) composition (often determined by what the actual minerals are).
What are the factors that you should consider when classifying igneous rocks?
Among them are:
- Minerals Present in the Rock (the mode). The minerals present in a rock and their relative proportions in the rock depend largely on the chemical composition of the magma. …
- Texture of the Rock. Rock texture depends to a large extent on cooling history of the magma. …
- Color. …
- Chemical Composition.
Jan 11, 2011