Question

The origin of basic and acidic igneous rock???

Answer 1

Answer:

Acidic (silicic) igneous rocks. Appearance: Light coloured, medium- to coarse-grained intrusive igneous rocks with more than 20% of quartz. Within feldspars, the Na-rich plagioclase prevails over K-feldspar (orthoclase). The mafic minerals are represented by amphibole, pyroxene and biotite.

Answer 2

Origin of acidic and basic igneous rock.

Explanation:

• The mineral composition of a rock is characterized by the chemical composition of the magma from which it is crystallized.
• There exists only two type of magma in nature:-

1. Acid magma
2. Basic magma

• Acid magma- The magma which is rich in Si, Na and K, and are poor in  Ca, Mg and Fe is called acid magma.These type of magma results in the formation of Acidic igneous rock like rhyolite, granite etc.

• Basic magma-The magma which is rich in  Ca , Mg and Fe and are poor in  Si, Na and K is called basic magma.These type of magma results in the formation of Basic igneous rock like gabbro,basalt,etc.