Gabbro - Wikipedia
Gabbro (/ ˈ ɡ æ b r oʊ / GAB-roh) is a phaneritic (coarse-grained and magnesium- and iron-rich), mafic intrusive igneous rock formed from the slow cooling magma into a holocrystalline mass deep beneath the Earth's surface.
Igneous textures - Wikipedia
The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye. Examples of phaneritic igneous rocks are gabbro, diorite, and granite. Porphyritic textures develop when conditions during the cooling of magma change relatively quickly.
4.1: Classification of Igneous Rocks - Geosciences LibreTexts
Gabbro is a coarse-grained mafic igneous rock, made with mainly mafic minerals like pyroxene and only minor plagioclase. Because mafic lava is more mobile, it is less common than basalt. Gabbro is a major component of the lower oceanic crust.
Gabbro: A Coarse-grained, Dark-Colored Plutonic Rock
2023年7月21日 · Gabbro is a dense, phaneritic, mostly plutonic mafic rock. It is dominated by calcium-rich plagioclase and pyroxene but has smaller amounts of other minerals.
Gabbro | Properties, Formation, Composition, Uses - Geology …
2023年9月4日 · Gabbro is a type of intrusive igneous rock that is coarse-grained and dark-colored, typically composed of calcium-rich plagioclase feldspar, pyroxene, and sometimes olivine. It is similar in composition to basalt, which is its extrusive equivalent.
Gabbro | Geology 1501 | ECU
Lower part of continental crust and intruded into batholiths above subduction zones during Archean and Proterozoic Eons. East Carolina University. Department of Geological Sciences. East 5th Street Greenville, NC 27858-4353 USA. 252-328-6360 | Contact Us.
19 How Are Igneous Rocks Classified? - City University of New York
The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye. Examples of phaneritic igneous rocks are gabbro, diorite and granite, all intrusive rocks. Phaneritic texture is sometimes referred to as coarse-grained igneous texture.
Igneous Rock Textures - ThoughtCo
2019年11月5日 · There are nine main types of igneous rock textures: Phaneritic, vesicular, aphanitic, porphyritic, poikilitic, glassy, pyroclastic, equigranular, and spinifex. Each kind of texture has a variety of different characteristics that make them unique.
5.3: Igneous Rock Classification - Geosciences LibreTexts
2024年4月11日 · Gabbro and basalt are the intrusive and extrusive names for mafic igneous rock. Peridotite is ultramafic and intrusive and komatiite as the fine-grained extrusive equivalent. Komatiite has been a rare rock because for most of Earth history, volcanic material that comes directly from the mantle is not common.
The Textures of Igneous Rocks – Geology In
Rocks with a phaneritic texture (phaner mean visible) are typically intrusive igneous rocks, which means that they formed from magma that cooled underground. Examples of intrusive igneous rocks with a phaneritic texture include granite , diorite, and gabbro .