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Vocanic Activity in Ireland - Coggle Diagram
Vocanic Activity in Ireland
Antrim-Derry Plateau
basalt plateau
4,000 km2
rises above 350 m
result of volcanic activity that began 65 million years ago and lasted for 15 million years
Eurasian-American plate began to split (convergent plate boundaries)
fissures opened
lava flowed through fissures to form a flat landscape
not a violent eruption
flows varied in thickness
lava flows cooled to form the igneous rock basalt
original chalk landscape covered
as plates drifted apart new continental crust formed and Atlantic Ocean began to open
Volcanic activity moved and ceased in A-D P
Giants Causeway is most distinctive part
magam cooled very slowly after trapped in a river valley
as cooled contracted around regularly spaced centres causing the hexagon shaping
lower columns cooled slower forming a more destinct pattern
costal erosion exposed the lower columns
Leinster Batholith
Larges batholith in GB and Ireland
1,500 km2
includes the Dublin contains and Wicklow mountains an Blackstairs mountains
formed when molten magam forced up into the crust
pushed original sediment rock out of the way
created arched folds
magma cooled very slowly to form granite
as magma came into contact with the surrounding sedimentary rock the pressure and heat formed metamorphic rock
quartzite and schist
weathering and erosion have exposed the gentle slopes
some slopes are topped with tors
tors = large granite blocks with large joints enlarged by weathering
Lugnaquilla is the highest peak
Wicklow mountains
still has its capstone of resistant schist
protected the interlayer of granite from weathering and erosion
given it a steeper slope than surrounding landscape