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Lecture 7

Lecture 7

3 Pages
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Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles

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EESA06 Lecture 7
Iceland is basalt volcano
Ecuador- Pyroclastic volcano
oExample of hot spot
Naz ca plate moving to the east- volcano being carried away from hot spots and they erode and
create hot spot trails
oThey have flat tops
oBecome guyots- flat topped dead volcano as part of a hot spot trail
About 40 hot spot and most of them in oceanic plates
Why do we get islands in the middle of the ocean
oGeology of the islands and found 2 things:
The age of the rocks on hot spot island compared to surround ocean floor is much
younger, because volcano burning their way through the plates
When looked at relative ages of islands, found that the youngest island is right above
hot spot due to ongoing volcanic activity
Hot spots trail gives direction of plate movement
Cocos plate rights through Costa Rica
Marine iguanas live in water
Shield volcanoes , the younger rocks (volcanic activity) occurred towards northwest
Bathymetric- map that shows water depths
Oldest islands about 3 million years old
Shield volcanoes have low profiles- have fluid basalt coming out
oStreams of lava
oBumps are result of magma hitting water called phreatomagmatic
Water will go down and hit magma and get a release of steam
No vegetation- very young landscape, still actively evolving
Distinct layers in rock- pyroclastic ash
Cyndercone- ash being blown out and accumulating around rim
oSometimes called scoria- larger pieces of ash
Trace fossil- track of an organism
Predation- to eat something
oGiant cactus need to grow along stem because they are eaten by giant tortoises
oTortoises live to about 100
19th century used as sources of meat by ship crews
Livestock being introduced, eaten by goats
Feral cats- wild cats
Punk sea bird- aka Blue footed booby
oHave special peaks, its nostrils are below its eyes because it dives in water to get fish
Darwin published the origins of species in 1859
Beaches had been raised up over the years
Rocks and Minerals
The Rock Cycle
Magma- brand new rocks called igneous rocks, there are intrusive igneous rocks that will cooled at
depth
oExtrusive rocks are cooled at surface
Sediments get deposited in layers and overtime get cemented- sedimentary rocks
oMight formed in many km thick
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Description
EESA06 Lecture 7 Iceland is basalt volcano Ecuador- Pyroclastic volcano o Example of hot spot Naz ca plate moving to the east- volcano being carried away from hot spots and they erode and create hot spot trails o They have flat tops o Become guyots- flat topped dead volcano as part of a hot spot trail About 40 hot spot and most of them in oceanic plates Why do we get islands in the middle of the ocean o Geology of the islands and found 2 things: The age of the rocks on hot spot island compared to surround ocean floor is much younger, because volcano burning their way through the plates When looked at relative ages of islands, found that the youngest island is right above hot spot due to ongoing volcanic activity Hot spots trail gives direction of plate movement Cocos plate rights through Costa Rica Marine iguanas live in water Shield volcanoes , the younger rocks (volcanic activity) occurred towards northwest Bathymetric- map that shows water depths Oldest islands about 3 million years old Shield volcanoes have low profiles- have fluid basalt coming out o Streams of lava o Bumps are result of magma hitting water cal
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