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Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole?

(1) granite
(2) rhyolite
(3) gabbro
(4) basalt

Respuesta :

Answer:

(3) Gabbro

Explanation:

Gabbro is a  dark-colored, coarse-grained and intrusive igneous rock. Generally, this type of rock is having dark green or black color. The main composition of this type of rock is augite and plagioclase minerals.

The approximate composition of Gabbro rock given as

1 .25% plagioclase feldspar  

2.5% amphibole

3.10% olivine

5460% pyroxene

Therefore the answer will be (3).

(3) Gabbro

fichoh

Intrusive igneous rocks cools and solid below the surface, leading to the formation of coarse-grained minerals. Hence, the intrusive igneous rock composed of the listed chemical constituents is gabbro.

  • Rhyolite and Basalt are extrusive igneous rocks, hence, they form at the surface.

  • Gabbro are mafic rocks containing mainly of dark colored minerals and are composed mainly of plagioclase feldspar, pyroxene and olivine.

  • Granite on the other hand are also intrusive, they are mainly composed of light colored minerals such as Quartz, Feldspar and Mica.

Hence, the intrusive igneous rock is Gabbro.

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