To the Point Classification of Igneous Rocks

To the Point Classification of Igneous Rocks
 https://naturealscience.blogspot.com/2020/02/Classification-of-Igneous-Rocks.html

Igneous Rock Definition

The Rocks which are formed due to the Cooling action, and solidification of molten magma, and lava called Igneous Rocks.

Characteristics of Igneous Rocks

  • Igneous rocks are considered the world’s oldest rocks and are also known as primary rocks.
  • Igneous Rocks are crystalline because they are formed from the cooling of molten magma.
  • Igneous Rocks are not made of Rounded Particles (Textures).
  • Igneous Rocks are made of texture having various shapes and sizes.
  • Igneous Rocks do not contain any fossil content.
  • Igneous Rocks are compact; therefore, they are too hard to be eroded easily.therefore,
  • Igneous Rocks contain a large variety of minerals in bulk quantity.
  • Igneous Rocks are Non-porous, thus, water cannot percolate in them.
  • Igneous Rocks are not formed in layers.
  • Igneous Rocks show a lot of variations in their Chemical, Mineralogical composition and textural Characteristics. 
-----------------------------------------------------------------------------------------------

Classification of Igneous Rocks 

Igneous Rocks are classified in three different ways

    01.   According to the Situation

    02.  According to Mineral composition 

    03.   According to Formation


    01. According to the Situation

According to the situation, igneous rocks are classified into two types:

Intrusive Igneous Rock (Plutonic Rock): formed inside the surface.

Extrusive Igneous Rock (Volcanic Rock):  formed outside surface.


----------------------------------------------------------------------------------------------

02. According to minerals Composition

According to minerals, igneous rocks are classified in to

  i.     Acid Igneous Rock             
 ii.    Basic Igneous Rock 

i. Acid Igneous Rock Properties:
  • Acid igneous rocks about 80% composed of acid-forming radical silicon.
  • Acid igneous rock is light in colour.
  • It cools fast, therefore; it does not flow or spread away.
  • High mountains formed from Acid igneous rock.
  • Acid Igneous Rocke belongs to the portion of Earth Called Sill.
ii. Basic Igneous Rock Properties
  • Basic Igneous Rocks contains 40% silicon, they contain 40% magnesium and rest 20% iron.
  • Basic igneous rock cools slowly because it contains too low silicon percentage.
  • Basalt and Dole site are main examples of basic igneous rock.
  • Basic Igneous Rock Belongs to Portions of Earth Called 'Sima'.
-----------------------------------------------------------------------------------------------

03. According to the Formation 

According to the formation, igneous rocks are classified into six types:

    a.     Sill
    b.     Dyke
    c.      Laccolith
    d.     Lapolith
    e.      Phacolith
    f.       Batholith

    a. Sill Igneous Rocks

When an intrusion occurs like a thin sheet of a horizontal position, parallel to the existing rock called sill igneous rock.

    b. Dyke Igneous Rock

  • When vertical layers of intrusive igneous rocks are formed in already existing sedimentary rock are called dyke igneous. rock.
  • Dykes are semi-crystalline rocks formed along the beds or layers of sedimentary rocks.

    c. Laccolith Igneous Rock

A laccolith is a dome-shaped large blister of igneous rock that appears on the upper Earth Surface.

    d. Phacolith Igneous Rock

Phacolith is a lense-shaped, wavelike a mass of igneous rock that occupies the crest of anticline and bottom of the syncline, it is fed by the Conduit (volcanic pipe) from the bottom.

e. Batholith Igneous rock

The Batholith is a large body of intrusive igneous rock; it is also called Plutonic rock. it is formed deep inside and mostly covers a larger than 100 sq km area.
-----------------------------------------------------------------------------------------------


You Can Read Our More Articles  





Comments

Follow us



 Twitter Instagram











Popular posts from this blog

Top 03 Biggest websites to download free PDF Books

Top 03 Completely free Online Tuition and Coaching Sites in The Urdu and English Languages.

Download Past Papers of Shaheed Benazir Bhutto University Nawabshah

Download Latest CSS Syllabus and Original Past Papers in PDF

Non Material Pollution

Contact Form

Name

Email *

Message *