Granite Basalt 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.

Granite basalt gabbro. All rocks of igneous origin consist of magma or molten earth that finds its way up to. It means that it formed as magma cooled slowly in the crust. Gabbro is a coarse grained and usually dark colored igneous rock it is an intrusive rock. Basalt and gabbro are both mafic igneous rocks having same mineralogy.

Gabbro with large augite phenocrysts embedded in white plagioclase. Diabase ˈ d aɪ. 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.

The main difference between them is the process through which it formed and texture. Gabbro definition a dark granular igneous rock composed essentially of labradorite and augite. ə b eɪ s or dolerite or microgabbro is a mafic holocrystalline subvolcanic rock equivalent to volcanic basalt or plutonic gabbro diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite dark mafic glass. Diabase is the preferred name in north america while dolerite is.