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Geotektonik – Global Tectonics
CHAPTER 4
Mid ocean ridges (MOR)
structure of normal oceanic crust
ophiolites
we have discussed submarine ridge
topography on various length scales….
slow
Topography of slowly spreading MOR
Example: Sounth-Indian Ridge
View towards the W at 116°E, ca. 80 km
from B. Haxby (1998) Geoph. Monogr. 106
Topography of fast spreading MOR
Example: East-Pacific rise (EPR) at 7°S
View towards South over ca. 160 km
from B. Haxby (1998) Geoph. Monogr. 106
fast
What a geologist can do
Dredging
Diving
Drilling
All other information comes from geophysics
(topography, seismology, magnetics …..)
Dredging
(images AGU)
DSV Alvin (Woods Hole; USA)
Deep Submergence Research Vehicle
maximum depth 4500 m
after reconstruction 6000 m
(expected for 2015)
(images AGU)
Diving
Remotely Operated Underwater Vehicle
ROV Hercules (NOAA)
(images AGU)
National Oceanic and Atmospheric Administration (USA)
Diving
Joides Resolution
(images AGU)
Drilling
global tectonics 2016-17 chapter 4.pdf (PDF, 11.59 MB)
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