GEL 20 Lecture Notes - Lecture 5: East Pacific Rise, Mid-Ocean Ridge, Seafloor Spreading

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8 Feb 2017
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Topic 5: Extens ional Tectonics
Dive rgen t Plate Bou n da ries
- plate bounda ries whe re 2 plate s s pre a d a pa rt to cre a te ne w lithos phere
Mid Oce anic Ridg e S ys te m
- the prima ry e xa mple of diverge nt pla te bounda rie s
- unde r wa te r mounta in chain
Mid Atlan tic Ridg e
- mid oce a n ridge tha t runs up the middle of the Atlantic ocea n
Eas t Pa c ific Ris e
- mid oce a n ridge tha t runs through the Ea s t P a cific ocea n
Rift Valle y a t Cre s t o f Ridg e
- this is where the proce ss of unde rwate r volca nism occurs
- this rift va lle y is the bounda ry be twee n the 2 divergent pla te s
Pro c e s s of S ea floor S p re a ding , Ho w S e a flo o r is Forme d an d How
Ocean Ba s in s Grow
- Se a floor S prea ding: ocea n ba s ins progre ss ive ly wide n over time a nd ne w a re as of
oce anic crus t a re forme d which occurs through the upwelling of magma a t mid-oce an
ridge s
- the ma gma the n moves outwards to e ithe r s ide
- se a floor is forme d a s ma gma/la va flows through fracture s , it e ventua lly s olidifie s a nd
forms ne w se a floor
- oce an ba sins grow through s ea floor sprea ding
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