Island-arc orogeny

Date: 2015-10-07; view: 587.

Describe the mountain building process, using the following information and the diagrams in R.P 8.2.7, 8.2.8, 8.2.9

Fig. 49 Continent-continent collision

Fig. 48 Ocean-continent boundary

Fig. 47 Ocean-ocean subduction zone

2. Oceanic plate subduction beneath a continent– involving island-arc collision, this process helped produce the Andes.

3. Double continent collision – the way in which the Alps and Himalayas formed.

a. subducted oceanic crust

b. low outer island-arc of sediments squeezed by subducting oceanic crust

c. inner island-arc of mountainous volcanoes produced by the “bobbing up“ of light, subducted, melted oceanic crust and sediments.