Some speculation that life originated in similar environments Also lead to formation of massive sulfide ore deposits Gold, copper, zinc Zones of Convergence Subduction zones where crustal rocks are consumed Good example: Pacific &quot;Ring of Fire&quot; Chains of active earthquakes/volcanoes around the Pacific Ocean Relatively narrow, linear zones of activity Zone of collision between two plates - results in crustal shortening Reverse faulting Three possible situations 1) Continental vs. oceanic plates Oceanic plate is subducted due to density differences Location of many shallow to deep focus quakes Extend to depth beneath the overriding plate A deep trench commonly occurs where the subducting plate plunges beneath the overriding plate Collects sediments which are also subducted Remelting generates magma which forces its way to the surface Volcanic arc chains on-shore EXAMPLE: Andes, Cascades 2) Oceanic vs. oceanic collision Same basic idea as above Also results in subduction Volcanic chain usually off-shore EXAMPLE: Japanese Islands, Aleutian Islands 3) Continent vs. continent collisions Massive slabs of granitic crust collide No subduction possible so some major mountains are pushed up EXAMPLE: Himalaya Mountains;
(life; originated; L:in similar environments) (Collects sediments; Remelting; ) (Collects sediments; are also subducted; ) (magma; forces; its way to the surface Volcanic arc chains) (A deep trench; commonly occurs; L:where the subducting plate plunges beneath the overriding plate Collects sediments) (the subducting plate; plunges; L:beneath the overriding plate) (linear zones of activity Zone of collision between two plates - results in crustal shortening Reverse faulting Three possible situations 1) Continental vs. oceanic plates Oceanic plate; is subducted; due to density differences; L:Chains of active earthquakes/volcanoes around the Pacific Ocean Relatively narrow) Context(linear zones of activity Zone of collision between two plates - results in crustal shortening Reverse faulting Three possible situations 1 ) Continental vs. oceanic plates Oceanic plate is subducted,List([337, 534))):(Some speculation that life originated in similar environments; lead; to formation of massive sulfide ore deposits)
linear zones of activity Zone of collision between two plates - results in crustal shortening Reverse faulting Three possible situations 1 ) Continental vs. oceanic plates Oceanic plate is subducted,List([337, 534))
life Collects sediments Collects sediments magma A deep trench the subducting plate linear zones of activity Zone of collision between two plates - results in crustal shortening Reverse faulting Three possible situations 1) Continental vs. oceanic plates Oceanic plate Some speculation that life originated in similar environments
originated Remelting are also subducted forces commonly occurs plunges is subducted lead
L:in similar environments
its way to the surface Volcanic arc chains
L:where the subducting plate plunges beneath the overriding plate Collects sediments
L:beneath the overriding plate
due to density differences L:Chains of active earthquakes/volcanoes around the Pacific Ocean Relatively narrow
to formation of massive sulfide ore deposits