What are intrusive igneous rock bodies called?
A body of intrusive igneous rock which crystallizes from magma cooling underneath the surface of the Earth is called a pluton. If the pluton is large, it may be called a batholith or a stock depending on the area exposed at the surface. If it runs parallel to rock layers, it is called a sill.
What are igneous rocks bodies?
Bodies of igneous rock are referred to as extrusive when formed on the Earth’s surface, and intrusive when formed within the Earth. Intrusive bodies are further subdivided into plutonic – large intrusions formed at moderate to great depth, and hypabyssal – small intrusions formed near the Earth’s surface.
What is meant by intrusive rock bodies?
We can define intrusive igneous rocks as masses of rock formed when magma cools beneath the surface (generally called plutons). So basically these are igneous rock bodies where the magma has solidified before reaching the surface. Important intrusive rock bodies include stocks, batholiths, laccoliths, dikes and sills.
What are the types of intrusive igneous bodies?
FORMS OF INTRUSIVE IGNEOUS ROCKS. Commonly observed forms of Plutonic (intrusive) rocks observed in the field are: dykes, sills, laccoliths, bysmaliths, phacoliths, lopolith, volcanic necks, batholiths and chonoliths.
What is intrusive igneous rocks?
Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. 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.
Which of the following is a concordant intrusive body?
Laccoliths
Laccoliths: Laccoliths are concordant igneous bodies with their lower surface flat and upper surface arched in the form of dome (Fig. 8) such bodies are naturally formed due to the accumulation of viscous magma underneath the rocks occurring upon the surface. Laccoliths may have dykes or sill acting as their feeders.
What are intrusive igneous rocks quizlet?
Intrusive Rock. Intrusive rock is igneous rock, that is formed by the crystallized magma deep within the earth. They often haves large crystals interlocked together to form the rock mass. This intrusive cooling process occurs very slowly in comparison to extrusive rock.
What is an example of intrusive igneous rocks?
Intrusive igneous rocks are rocks that crystallize below the earth’s surface resulting in large crystals as the cooling takes place slowly. Diorite, granite, pegmatite are examples of intrusive igneous rocks.
What is an intrusive igneous rock?
What is the name of an intrusive igneous rock?
Laccoliths are like sills, except they have caused the overlying rocks to bulge upward. Pipes are cylindrical conduits. A body of intrusive igneous rock which crystallizes from magma cooling underneath the surface of the Earth is called a pluton.
What kind of rocks are formed in fissures?
Because their crystals are of the rough equal size, these rocks are said to be equigranular. Intrusive rocks formed at greater depths are called plutonic or abyssal. Some intrusive rocks solidified in fissures as dikes and intrusive sills at shallow depth and are called subvolcanic or hypabyssal.
How big is an intrusive igneous rock Dyke?
The dyke is about 25 cm across and the chilled margins are 2 cm wide. The diagram here is a cross-section through part of the crust showing a variety of intrusive igneous rocks. Except for the granite (a), all of these rocks are mafic in composition.
What kind of rock is melted by magma?
Melting the surrounding rock (called country rock) Pushing the rock aside (where the rock is hot enough and under enough pressure to deform without breaking) Breaking the rock. When magma forces itself into cracks, breaks off pieces of rock, and then envelops them, this is called stoping. The resulting fragments are called xenoliths.