Comment se forme l andésite?

Une roche volcanique est donc une roche issue du refroidissement d’un magma lorsque celui-ci s’est répandu à la surface de la Terre. Les laves fluides donneront une roche volcanique appelée basalte, et les laves visqueuses donneront une roche volcanique appelée andésite.

Comment se forme le volcanisme andésitique?

Comme ce sont des fonds océaniques, des sédiments gorgés d’eau sont entraînés avec la plaque plongeante. Vers 150 km de profondeur, ces sédiments entrent en fusion avec la partie supérieure de la plaque pour donner naissance à un magma andésitique.

What is texture describes an andesite?

Andesite: The specimen shown is about two inches (five centimeters) across and has a porphyritic texture . What is Andesite? Andesite is the name of a family of fine-grained, extrusive igneous rocks that are usually light to dark gray in color. They have a mineral composition that is intermediate between granite and basalt.

What is andesite used for?

Andesite is currently used only for decoration. It has the same blast resistance as stone, meaning it can be used as a substitute for stone when building. Andesite can be mined using any pickaxe. If mined without a pickaxe, it drops nothing. ↑ Times are for unenchanted tools in seconds. For more information, see Haste § Instant mining.

Is andesite an intrusive or extrusive igneous rock?

Andesite is a volcanic (=extrusive igneous) rock with an intermediate to high silica content. It is the eruptive equivalent of diorite,- the same magma that produces diorite as an intrusion will become andesite if erupted.

Is andesite mafic or felsic?

Felsic rocks are light in colour, while mafic rocks are darker, due to their content of dark minerals. felsic (or acid) rocks: high silica content, more than 63\% SiO2 (e.g. granite and rhyolite) intermediate rocks: 52 – 63\% SiO2 (e.g. andesite and dacite)