12_marine_SFspread_09_post

12_marine_SFspread_09_post - 12 Marine Geology Seafloor...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
afloor Spreading: afloor Spreading: 1 12. Marine Geology & Seafloor Spreading
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
afloor Spreading: afloor Spreading: 2 Why this is important  The topographic features of the ocean basins are prime  evidence of plate tectonics.
Background image of page 2
afloor Spreading: afloor Spreading: 3 Continental margins  Portions of ocean floor extending from shoreline to landward edge of  abyssal plain Fig. 4.3 Continental shelf broad, very gently  sloping platform  underlain by marine  sediments (commonly  very thick) overlying  continental crust; may  be exposed during  glacial periods
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
afloor Spreading: afloor Spreading: 4 Continental shelf : broad, very gently sloping platform underlain by marine sediments  (commonly very thick) overlying continental crust; may be exposed during glacial  periods Continental slope : inclined at 2-4°; marine sediments overlie transitional crust Continental rise : more gently inclined region adjacent to the continental slope  overlying oceanic crust Fig. 18.5 Continental margins Rise
Background image of page 4
afloor Spreading: afloor Spreading: 5   Trench : large topographic depression, commonly partially filled with  sediments, adjacent to many continental margins Continental margins Fig. 18.5b
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
afloor Spreading: afloor Spreading: 6 Ocean basins   Abyssal plains relatively flat parts  of ocean floor  (between  continental margins  and mid-ocean  ridge system) Fig. 18.6c Fig. 3.7b
Background image of page 6
afloor Spreading: afloor Spreading: 7   Mid-ocean ridge : large-scale,  laterally continuous  positive topographic  feature, sometimes capped by an axial graben (depression), associated with  basaltic pillow lavas, normal faults, and black smokers Map by:  Marie  Bruce  Heezen Ocean basins
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
afloor Spreading: afloor Spreading: 8 Fig. 3.10 Ocean basins   Mid-ocean ridge : large-scale, laterally  continuous positive topographic feature,  sometimes capped by an  axial graben  (depression) , associated with basaltic  pillow lavas,  normal faults , and  black  smokers Fig. 3.9
Background image of page 8
afloor Spreading: afloor Spreading: 9 Fig. 4.10 Videos Videos Photo: D.B. Foster   Mid-ocean ridge : large-scale, laterally continuous positive topographic  feature, sometimes capped by an axial graben (depression), associated with  basaltic pillow lavas, normal faults, and  black smokers Ocean basins Black smokers eruptions of hot  water containing  abundant dissolved  minerals
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
afloor Spreading: afloor Spreading: 10 10     Seamounts Seamounts : positive topographic features underlain by volcanic rock; not laterally  : positive topographic features underlain by volcanic rock; not laterally  continuous. continuous.
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/25/2011 for the course GEOLOGY 100 taught by Professor Lepre during the Fall '11 term at Rutgers.

Page1 / 45

12_marine_SFspread_09_post - 12 Marine Geology Seafloor...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online