Diabase is an intrusive igneous rock with the same mineral composition as basalt. It cools under basaltic volcanoes, like those at mid-ocean ridges.

What is diabase igneous rock?

Diabase is a fine-grained igneous rock that would have formed when molten rock material cooled rapidly on or near the surface of the Earth.

What is a diabase intrusion?

What is Diabase? In the United States and Canada, the name "diabase" is used for a dark gray to black, fine-grained, intrusive igneous rock that has a composition similar to basalt and gabbro.

What is the characteristics of diabase?

diabase, also called Dolerite, fine- to medium-grained, dark gray to black intrusive igneous rock. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap.

What is diabase dike?

Diabase (/ˈdaɪ. ... 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).

Intrusive vs extrusive igneous rocks

45 related questions found

Is diabase a sedimentary rock?

Diabase in the map area was derived primarily from high-titanium, quartz-tholeiite magma. Sedimentary rocks within about 300 m (984 ft) above and 200 m (656 ft) below major diabase sheets are thermally metamorphosed.

Is granite intrusive or extrusive?

Granite is an intrusive igneous rock. Intrusive rocks form from molten material (magma) that flows and solidifies underground, where magma cools slowly.

What type of rock is a diabase?

Diabase is an intrusive igneous rock with the same mineral composition as basalt.

Is Slate non foliated or Nonfoliated?

Foliated (Latin for leaf) - grades from slate to phyllite to schist to gneiss. Produced by platy minerals growing in direction of least stress. Nonfoliated - typical when parent rock is sandstone or limestone. Also occurs in contact metamorphism and extreme metamorphism (granulite facies).

What is the difference between basalt and diabase?

Diabase is actually a variety of gabbro which consists mainly of labradorite feldspar, augite, magnetite, and olivine. ... Basalt is identical to diabase and gabbro, but is very fine-grained. Basalt is from a melt that cooled very rapidly- in other words, on the surface of the earth or in the ocean.

Which is an extrusive igneous rock?

Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.

Which other igneous rock is closest to diabase in mineral composition?

Diabase (dolerite) is a dark-colored igneous rock. It is compositionally equivalent to gabbro and basalt but texturally between them. Diabase is a common rock type. It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition.

How do you identify peridotite?

Classic peridotite is bright green with some specks of black, although most hand samples tend to be darker green. Peridotitic outcrops typically range from earthy bright yellow to dark green in color; this is because olivine is easily weathered to iddingsite.

Can granite be extrusive?

Granite. Granite, the equivalent of its extrusive (volcanic) rock type rhyolite, is a very common type of intrusive igneous rock. It contains more than 68% weight % of silica in composition and is granular and coarse-grained in texture. Its principal minerals are feldspars, quartz, and mica.

Why is granite extrusive?

Extrusive rocks are formed by the cooling of molten magma on the Earth's surface. This rock is also known as volcanic rock.

What is intrusive and extrusive?

The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

Is slate a rock?

slate, fine-grained, clayey metamorphic rock that cleaves, or splits, readily into thin slabs having great tensile strength and durability; some other rocks that occur in thin beds are improperly called slate because they can be used for roofing and similar purposes.

What type of rock has visible flat layers?

Sedimentary rocks generally have flat layers, made of clastic grains (gravel, sand, silt, clay, shells, plant fragments) or crystals of gypsum, halite or calcite. Metamorphic rocks layers are generally not flat-lying and foliated, they also can be folded.

Is slate porous or non porous?

Is Slate porous or nonporous? One of the primary benefits of slate is that it has very low porosity characteristics, hence its popularity for use on roof coverings and in wet areas. Thus slate is a very popular choice for use outdoors, from garden slabs , wall cappings and steps to barbecue kitchenss.

Is slate a foliated metamorphic rock?

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. ... The foliation in slate is called "slaty cleavage".

Is slate regional or contact metamorphism?

Most foliated metamorphic rocks—slate, phyllite, schist, and gneiss—are formed during regional metamorphism. As the rocks become heated at depth in the Earth during regional metamorphism they become ductile, which means they are relatively soft even though they are still solid.