Basaltic

Basaltic tuff Most of the moais in Easter Island are carved out of tholeiite basalt tuff Basaltic tuffs are also of widespread occurrence both in districts where volcanoes are now active and in lands where eruptions have long since ended.

Observations, however, suggest that 99 percent of the predicted basaltic material is missing. citation Until 2001, most basaltic bodies discovered in the asteroid belt were believed to originate from the asteroid Vesta (hence their name V-type).

Using the decay rate of radioactive minerals found in the basaltic rocks, the researchers dated 25 drill cores recovered from the plateau.

However, scientists for the Lunar and Planetary Institute (LPI) have found that the lava flow on the Venusian Ovda Regio highlands plateau is composed of basaltic lava.

At Kīlauea, this was the largest summit collapse since at least the year 1800, and it included the strongest summit explosions since three comparable events have occurred at basaltic volcanoes worldwide in the past 50 years.

The reddish-brown rock inside the cone is the result of oxidation; the interaction of heated rock and gases causes black basaltic cinders to change color, similar to rust forming on metal.

Although usually characterized as "dark", basaltic rocks exhibit a wide range of shading due to regional geochemical processes.

An estimated convert of basaltic lava was poured out during the eruption.

As a result of remelting of basaltic oceanic crust due to subduction, the cores of the first continents grew large enough to withstand crustal recycling processes.

Basaltic tuff or pyroclastic rocks are rare but not unknown.

Dorsum or agger viae: the elliptical surface or crown of the road (media stratae eminentia) made of polygonal blocks of silex (basaltic lava) or rectangular blocks of saxum qitadratum (travertine, peperino, or other stone of the country).

Evidence near the summit shows light coloured granite (which had cooled in subterranean chambers several kilometres beneath the surface) lies among dark basaltic lavas (that only form on the surface).

Here basaltic lavas gently flow out of rifts to build huge dome-shaped volcanic mountains whose eroded summits form island arcs, chains, and clusters.

However, the discovery of the asteroid 1459 Magnya revealed a slightly different chemical composition from the other basaltic asteroids discovered until then, suggesting a different origin.

In the central and western part of the island is the Troodos Massif, a mountain range whose surface layer is mostly basaltic lava rock, and whose maximum elevation is convert.

Lava tubes and basaltic caves are important astrobiological targets on Earth and Mars (see also Martian lava tube ).

Like the basalt volcanoes on Earth, Martian basaltic volcanoes are capable of erupting enormous quantities of ash.

Massive basaltic eruptions took place generally at the base of large impact craters.

Petrology Photomicrograph of a volcanic (basaltic) sand grain ; upper picture is plane-polarized light, bottom picture is cross-polarized light, scale box at left-center is 0.25 millimeter.

The dark component is probably due to the infall of carbonaceous material, whereas the bright component is the original Vesta basaltic soil.