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Lecture 4

Lecture 4 In Class Notes

3 Pages
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Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles

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-As the oceanic crust moves away from the ridge, it expands and is thicker due to
the cooling process
oThis leads to the ocean floor to start to subduct
-The history of the earth is controlled by the ocean history
-Ophiolites are ancient pieces of oceanic crust that gets pushed up on land
instead of being subducting under the continental crust. Fossil ocean crust
preserved on land
oThese are rich in minerals
-Jokulhlaups: is volcanic activity beneath glaciers (word means to leap from the
mountains)
oCauses flash floods
-Fractures: are cracks in the ridges, they enable ocean floor spreading on the
curved floor of the earth
-Dikes: are the result of hot magma intruding into older rock along fractures,
thus causing the rock to push apart
-Gabbro: is the equivalent of basalt but has much bigger crystals because it cools
at the depths around the magma
-Sheared Peridotite: is what the mantle is made out of
omade of the mineral olivine (pieces of olivine used for jewelry is referred to
as Peridot [green gemstone, very soft])
-Plumes feed the whole process of going up the through the sheeted dikes and
over to the pillow basalt that slowly spreads evenly on both sides of the magma
chamber
-basalt, gabbro are distilled from hot mantle plumes
-the widening of the ridge through time is called ridge push as dikes intruded
-slab pull is the end of the ocean floor that sinks under its own weight
-continental crust is the product of the melting of ocean crust plus sea water
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Description
- As the oceanic crust moves away from the ridge, it expands and is thicker due to the cooling process o This leads to the ocean floor to start to subduct - The history of the earth is controlled by the ocean history - Ophiolites are ancient pieces of oceanic crust that gets pushed up on land instead of being subducting under the continental crust. Fossil ocean crust preserved on land o These are rich in minerals - Jokulhlaups: is volcanic activity beneath glaciers (word means to leap from the mountains) o Causes flash floods - Fractures: are cracks in the ridges, they enable ocean floor spreading on the curved floor of the earth - Dikes: are the result of hot magma intruding into older rock along fractures, thus causing the rock to push apart - Gabbro: is the
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