Igneous Rocks Granite To Gabbro

Gabbro is a coarse grained and usually dark colored igneous rock it is an intrusive rock.

Igneous rocks granite to gabbro.

Gabbro has a variety of uses in the construction industry. Determines the color of the rock. The central cores of major mountain ranges consist of intrusive igneous rocks usually granite. Igneous rocks are formed from the solidification of molten rock material.

There is a gabbro intermediate or low silica content and rarely contains quartz. Gabbro ˈ ɡ æ b r oʊ is a phaneritic coarse grained mafic intrusive igneous rock formed from the slow cooling of magnesium rich and iron rich magma into a holocrystalline mass deep beneath the earth s surface. Igneous rocks with similar composition are basalt extrusive equivalent of gabbro and diabase the same rock type could be named dolerite or microgabbro instead. Examples of intrusive rocks are granite and gabbro.

Slow cooling coarse grained gabbro is chemically equivalent to rapid cooling fine grained basalt much of the earth s oceanic crust is made of gabbro formed at mid ocean. Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. Gabbro is a dark colored igneous rock that is considered to be the plutonic equivalent of basalt. What are igneous rocks.

There are two basic types. Unlike granite gabbro is low in silica and has no quartz. Gabbro is a coarse grained dark colored intrusive igneous rock. Granite is made from three commonplace minerals quartz mica and feldspar and when viewed from a distance appear tan pinkish or gray relying at the concentrations and grain sizes of the 3 minerals.

It means that it formed as magma cooled slowly in the crust. Granite is a medium tocoarse grained acid igneous rock with essential quartz 20 and feldspar where alkali feldspar constitutes between 100 and 35 of the feldspars and minor mafic minerals. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Gabbro with large augite phenocrysts embedded in white plagioclase.

Gabbro is a dark medium to coarse grained intrusive igneous rock composed of calcium plagioclase pyroxene and minor olivine but no quartz. Is controlled by the composition of magma. Also gabbro has no alkali feldspar only plagioclase feldspar with a high calcium content. Records the rock s cooling history.

The texture of an igneous rock. By the weathering of pre existing rocks. When exposed by erosion these cores called batholiths may occupy huge areas of the earth s surface. It is the most abundant rock in the deep oceanic crust.

Igneous rock is formed. Is caused by leaching. Trapped deep within the earth magma is authorized to cool slowly.