Author Question: What type of volcanic products (lava flows, lava domes, or pyroclastic material) and types of ... (Read 134 times)

cdr_15 · **on:** Jul 16, 2018

What type of volcanic products (lava flows, lava domes, or pyroclastic material) and types of volcanoes would you expect from an eruption of basalt? of andesite?

of dacite? of rhyolite? If there is more than one type of volcanic product, rank them from most abundant to least abundant.
What will be an ideal response?

Question 2

Write a paragraph explaining the processes that create the various igneous rock compositions on Earth.

What will be an ideal response?

kusterl · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

Basaltic magma:
Products: (most abundant) lava flows, pyroclastic material, lava domes (least abundant).
Volcano types: shield volcanoes, cinder cones
Andesitic magma:
Products: (most abundant) pyroclastic material, lava flows, lava domes (least abundant).
Volcano types: cinder cones, composite volcanoes
Dacitic magma
Products: (most abundant) pyroclastic material, lava domes, lava flows (least abundant).
Volcano types: composite volcanoes, dome complexes
Rhyolitic magma
Products: (most abundant) pyroclastic material, lava domes, lava flows (least abundant).
Volcano type: dome complexes

Answer to Question 2

Key concepts: Partial melting of the mantle produces mafic magma that crystallizes to form basalt or gabbro. Fractional crystallization of mafic magma can produce intermediate or felsic magma. Partial melting of different rock types produces different magma compositions. These magmas of different starting composition may mix with one another to produce still different compositions.