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  1. Basalt is an extrusive, mafic (contains a high amount of magnesium and iron) igneous rock.
  2. Basalt is an extrusive igneous rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium.
  3. Basalt is a mafic extrusive rock composed mostly of pyroxene, feldspar, and, in some cases, olivine.
  4. Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense.
  5. Basalt is a fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene.


  1. Use inert rocks such as sandstone, slate, granite and basalt for water conditions that are soft or low in p H.


  1. The parent rock is commonly siltstone or basalt, but may be other types of rock.
  2. Students should write the age of the volcanic ash beside the shale, siltstone and basalt on the list below the block diagram.


  1. Augite is often found as crystals in basalt.
  2. In contrast, fine-grained rocks, such as basalt, are igneous rocks that have crystals too fine to see with the naked eye.

Larger Crystals

  1. Rock having the same composition as basalt, but with larger crystals which are just visible to the unaided eye; also called traprock.


  1. The original rock prior to metamorphism could be shale, basalt, granite, sandstone, and tuff, to name a few.
  2. Most lode gold deposits sourced from metamorphic rocks because it is thought that the majority are formed by dehydration of basalt during metamorphism.


  1. It released the continents from the Earth's core and transformed them into icebergs of gneiss [granite] on a sea of basalt.
  2. A conclusion is that unlike the continents, oceanic crust is much less diverse, and basalt is the most common rock type.
  3. Granitic rock is typical of continents, while basalt predominates in ocean basins.


  1. It was early observed that although granite existed on continents, seafloor seemed to be composed of denser basalt.


  1. Chemically, gabbro is the same as basalt (gabbro forms when magma cools below the surface of the Earth, but basalt forms when the lava cools on the surface).
  2. Basalt originates from lava that has extruded onto the surface of the Earth.
  3. These sites usually produce basalt if the magma erupts at the surface, and gabbro if the material remains in the magma chamber.


  1. The molten magma extracted from harzburgite may then erupt on the surface as basalt.


  1. They were formed by lateritization (see laterite) of various silicate rocks such as granite, gneiss, basalt, syenite and shale.


  1. The honeycomb grid in the arms of Lelystad pictures the dykes, built with six-edged concrete or basalt blocks.
  2. The middle layer comprises basalt lava flows underlain by their frozen feeders, termed dykes.

Continental Rocks

  1. Basalt is similar in composition to mantle rocks, indicating that it came from the mantle and did not mix with continental rocks.

Low Viscosity

  1. In general, the basaltic magma of low viscosity can flow around the rekahannya, a basalt lava flows called basalt plateau.

Mafic Magma

  1. Being less dense than the basalt, the felsic magma tends to float on the mafic magma.


  1. When nepheline, the most common feldspathoid mineral in the world, also occurs in the rock, the basalt is described as a leucite nepheline tephrite.


  1. Basalt, alkali basalt, basanite, tephritic nephelinite, and nephelinite differ partly in the relative proportions of plagioclase and nepheline.
  2. A few igneous rock types with composition unlike basalt, such as nephelinite, do occur at the small basaltic cinder cones and flows but are extremely rare.
  3. Nephelinite is dark in color and may resemble basalt in hand specimen.

Gentle Slopes

  1. Volcanoes with broad, gentle slopes and built by the eruption of fluid basalt lava are called shield volcanoes.

Ocean Ridges

  1. The crustal portions of oceanic tectonic plates are composed predominantly of basalt, produced from upwelling mantle below ocean ridges.
  2. The oceanic crust displays an interesting pattern of parallel magnetic lines, parallel to the ocean ridges, frozen in the basalt.
  3. In contrast, alkali basalt is not typical at ocean ridges, but is erupted on some oceanic islands and on continents, as also is tholeiitic basalt.


  1. Lava flows have been erupted at many vents in the Cascade Range during Holocene time; their compositions range from basalt to rhyolite.
  2. Overall, 5 vents issued alkalic basalt lavas, with 2 of these vents producing flows that reached the sea.

Continental Crust

  1. Oceanic crust is made of basalt (the most common rock on earth), while Continental crust consists of lower density materials like granite.
  2. Continental Crust - the continents, made up of granitic rock, lighter than basalt so it floats on the oceanic crust.
  3. The continental crust is like the igneous rock granite, and the oceanic crust is like basalt, another igneous rock.

Granite Rocks

  1. This is because oceanic crust is made of basalt, which is denser (heavier) than the granite rocks that compose continental crust.
  2. The upper part mainly consists of granite rocks, while the lower part consists of basalt and diorite.
  3. The granite rocks are less dense as compared to basalt.


  1. The original source rock prior to metamorphism is basalt, gabbro, and other rocks with iron and magnesium.
  2. The field is characterized by basalt, which is a black to dark gray volcanic rock formed from lava rich in magnesium and iron.
  3. Volcanic rocks rich in magnesium may be produced by accumulation of olivine phenocrysts in basalt melts of normal chemistry: an example is picrite.

Mafic Rocks

  1. That magma crystallizes to mafic rocks such as gabbro and basalt.
  2. Basalt and gabbro are examples of mafic rocks.
  3. Though obsidian is dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic.

Dark Minerals

  1. Basalt is composed primarily of calcium-rich plagioclase feldspar (gray), olivine and various pyroxenes (dark minerals).
  2. Result? Mafic magmas produce dark colored rocks made of dark minerals (such as basalt), intermediate magmas intermediate colored rocks (e.g.

Basic Igneous Rocks

  1. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc.
  2. Anorthite is characeristic of the basic igneous rocks such as gabbro and basalt.
  3. A gray or black, weakly magnetic mineral found in basic igneous rocks, notably basalt, and metamorphic rocks.


  1. Pahoehoe is a highly fluid, hot form of basalt which tends to form thin aprons of molten lava which fill up hollows and sometimes forms lava lakes.
  2. Most basalt lavas are of a'a or "pahoehoe" types, rather than block lavas.

Lava Tubes

  1. The caves along Cave Loop Drive are located in lava tubes that transported basalt of Mammoth Crater to the east, to Craig Cave and beyond.


  1. The rock is derived from basalt, gabbro or similar rocks containing sodium -rich plagioclase feldspar, chlorite, epidote and quartz.
  2. If the vesicles become subsequently filled with secondary minerals, e.g., quartz or calcite, the rock is called amygdaloidal basalt.
  3. Tridymite or quartz may be present in the fine-grained groundmass of tholeiitic basalt, and feldspathoids are absent.

Fine Grained

  1. Basalt is fine grained because it cools very rapidly, whereas gabbro and granite are coarse grained because they have cooled slowly.


  1. Much of the crust is probably composed of a volcanic rock called basalt (buh SAWLT). Basalt is also common in the crusts of Earth and the moon.
  2. This chart is an example how minerals are used to interpret the metamorphism of basalt, the rock that makes up the crust of the world's ocean basin.
  3. Excluding the rocks between my ears, I'd have to say that basalt and granite have the honor of being the most important rocks in the crust.

Partial Melting

  1. Basalt magmas have formed by decompression melting of the Earth's mantle and by partial melting of rock in the interiors of Mars and the Earth's moon.
  2. The similarity to REE patterns produced by the partial melting of an alkali basalt has been noted above.

Rapid Cooling

  1. When basalt erupts underwater, the rapid cooling causes it to form a characteristic texture known as pillow basalt.
  2. This "glass" is formed naturally by the rapid cooling of molten basalt.

Small Crystals

  1. These rocks have small crystals with a fine-grained texture (e.g., basalt, the most common rock of the seafloor).
  2. Basalt has small crystals while gabbro has large crystals.

Mafic Minerals

  1. It's even heavier than the basalt, has an even higher percentage of the mafic minerals, and really doesn't want to be anywhere near the surface.


  1. Basalt, on the other hand, is mafic in composition -- meaning it is rich in pyroxene and, in some cases, olivine, both of which are Mg-Fe rich minerals.

Mafic Igneous Rock

  1. Anorthite is characeristic of the mafic igneous rock s such as gabbro and basalt.

Mafic Igneous Rocks

  1. Anorthite is characeristic of the mafic igneous rocks such as gabbro and basalt.
  2. For example, the mafic minerals pyroxene and plagioclase feldspar make up the mafic igneous rocks, basalt and gabbro.
  3. For example, the mafic minerals pyroxene and calcium-rich plagioclase feldspar make up the mafic igneous rocks, basalt and gabbro.


  1. Pyroxene and feldspar are the major minerals in basalt and gabbro.
  2. Basalt. Consist of feldspar and a high proportion of dark coloured minerals such as olivine and pyroxene which the rock a dark appearance.
  3. Gabbro & Basalt have black or dark green color, which consists of feldspar (bytownite).


  1. The feldspars are essential constituents of nearly all crystalline rocks, such as Granite, gneiss, mica, slate, most kinds of basalt and trachyte, etc.
  2. Trachybasalt: An extrusive rock intermediate in composition between trachyte and basalt.


  1. Pyroxenites that occur as xenoliths in basalt and in kimberlite have been interpreted as fragments of such layers.
  2. Among the rocks that commonly include peridotite xenoliths are basalt and kimberlite.


  1. The crustal portions of oceanic tectonic plates are comprised predominantly of basalt, produced from upwelling peridotite in the mantle below ocean ridges.
  2. It is an important mineral in the Earth 's mantle and is common in peridotite xenoliths erupted in kimberlite and alkali basalt.
  3. On Earth, most basalt magmas have formed by decompression melting of the mantle.


  1. Basalt - Basalts may vary greatly in composition and form.
  2. Layers of Basalt.jpg Layer upon layer of basalts that form the Columbia Plateau region of the northwestern United States.
  3. These minerals occur both in the matrix of, and as amygdules in the porous roofs of basalt flows, and in veinlets within the basalts.

Extrusive Igneous Rocks

  1. Extrusive igneous rocks Basalt (an extrusive igneous rock in this case); light colored tracks show the direction of lava flow.
  2. Extrusive igneous rocks Basalt (an extrusive igneous rock in this case); light coloured tracks show the direction of lava flow.
  3. Some examples of extrusive igneous rocks are Basalt, Gabbro, and obsidian.


  1. There were two primary volcanic associations: the tholeiitic basalt - komatiite and the tholeiitic to calc-alkaline bimodal basalt - rhyolite.
  2. March 24 Flood basalt, komatiite, continental rifts pp.


  1. Basalt can be formed by partial melting of this pyrolite, which drives off the enriched basalt magma, leaving behind the depleted dunite.

Shield Volcano

  1. Olympus Mons is a shield volcano that extrudes Basalt, this means it dosnt explode at all, lava runs down the sides which makes it the gradual sloping shape.
  2. A shield volcano has a gently sloping cone due to the low viscosity of the emitted material, primarily basalt.
  3. Crater Peak is a shield volcano primarily made of andesite and basalt lava flows topped by andesitic and dacite tephra.


  1. Lava
  2. Igneous Rock
  3. Granite
  4. Magma
  5. Events > Earthquakes > Plate Tectonics > Oceanic Crust

Related Keywords

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  Originally created: August 01, 2010.
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