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Where is andesite produced?

Andesite is an extrusive rock intermediate in composition between rhyolite and basalt. Andesite lava is of moderate viscosity and forms thick lava flows and domes. The word andesite is derived from the Andes Mountains in South America, where andesite is common. Andesite is the volcanic equivalent of diorite.

How is andesite is formed?

How was it formed? Andesite is a volcanic rock. It is fine-grained because it forms by the rapid cooling of magmas usually when it erupts onto the Earth’s surface and forms lava flows. Andesite forms from magma that contains less quartz (silica) than rhyolite but more than basalt.

Where does andesitic magma originate?

Granitic, or rhyolitic, magmas and andesitic magmas are generated at convergent plate boundaries where the oceanic lithosphere (the outer layer of Earth composed of the crust and upper mantle) is subducted so that its edge is positioned below the edge of the continental plate or another oceanic plate.

In which tectonic environment is andesite most common?

Andesite is typically formed at convergent plate margins but may also occur in other tectonic settings. Magmatism in island arc regions comes from the interplay of the subducting plate and the mantle wedge, the wedge-shaped region between the subducting and overriding plates.

What minerals does diorite contain?

Diorite, medium- to coarse-grained intrusive igneous rock that commonly is composed of about two-thirds plagioclase feldspar and one-third dark-coloured minerals, such as hornblende or biotite.

What is the intrusive form of andesite?

Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene. It corresponds to the volcanic rock type andesite formed when the same magma erupts to the surface and cools quickly.

Where is Dunite found?

Dunite is rarely found within continental rocks, but where it is found, it typically occurs at the base of ophiolite sequences where slabs of mantle rock from a subduction zone have been thrust onto continental crust by obduction during continental or island arc collisions (orogeny).

Where can I get diorite?

The last member of a rocky trinity that also includes granite and andesite, diorite generates naturally in large seams anywhere that you’d normally find stone. You’ll regularly see it exposed to the surface, particularly in hilly or mountainous areas. Or you can craft it by combining cobblestone with nether quartz.