Andesitic Magma

"Andesitic Magma"

What is an Andesitic magma?

Andesitic magmas are generated at convergent plate boundaries where the oceanic lithosphere (the outer layer of the 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.

How does it formed?

Andesite is typically formed at convergent plate margins but may also occur in other tectonic settings. Intermediate volcanic rocks are created via several processes: Fractional crystallization of a mafic parent magma. Partial melting of crustal material.

What type of volcano has andesitic magma?

Shield volcanoes are formed by basaltic magma, typically above a mantle plume, whereas the stratovolcanoes (sometimes referred to as composite volcanoes) are formed by andesitic/rhyolitic magma. You will also come to understand the relationship between volcanic phenomena and plate tectonics.

What is andesitic lava flow?

ANDESITIC LAVA- These viscous lavas have relatively high aspect ratios (thickness/area), generally > 1/100, and some are thick enough to form as lavadomes. Andesite commonly erupts from stratovolcanoes, where they form small-volume flows that typically advance only short distances down the flanks of a volcano.

Thank You !!

References:

www.appstate.edu/~abbottrn/vlcns/

https://www.britannica.com/science/andesitic-magma

https://en.wikipedia.org/wiki/Andesite

www.geology.sdsu.edu/how_volcanoes_work/andesiterhyolite_lava.html