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Lecture 3

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Environmental Science
Lisa Tutty

Jan 21, 2013 EESA06 Lecture 3 Notes Lecture 2 cntd.  You can get earthquake activity in the middle of a plate but it is not as common; most action happens at boundaries  If we didn’t have plate tectonics, the world would be covered by water because erosion would wear everything down  The south American plate is bigger than just the continent  Some plates are almost entirely oceanic crust  In divergent boundaries, magma comes up and forms new oceanic rock  Two plates come together at convergent boundaries  In transform plate boundaries, two plates slide past one another  You cant recycle continental crust, you can only make the oceanic crust sink  Mantle plume is breaking up the crust by causing it to thin out and cracks  When blocks of crust fall down, they form faults  And ocean has a mid-oceanic ridges, and seas do not  The Atlantic ocean is getting wider; keeps growing  In Iceland, parts of the mid-oceanic ridge is on land right now  Magma in MOR is ‘mafic’; means rich in iron and magnesium  Oceanic rift magma is rich in lighter stuff such as silica  Crust break up in ‘t-junction’s; one branch fails and the other 2 succeed to form a new ocean  Red sea has very little oceanic crust at bottom because it is such a new ocean  Flood basalts-> in some cracks in the earth, magma just flows out; enormous volumes just flowing out for a long time  Delta is formed when river cant hold sediments and drops them  Volcanoes show convergent boundaries  When an oceanic crust is subducted underneath a continental crust, the subducted plate is melted and forms magma  No other type of plate boundary other than convergent boundaries have deep earthquakes  Continental crust is older because it can’t be recycled  Oceanic crust will never be older than 180 million years old  On the west coast of Canada we have an ‘active’ margin where there is lots of activity; the East coast is a passive margin  As oceanic
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