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global tectonics 2016 17 chapter 2(1) .pdf



Original filename: global tectonics 2016-17 chapter 2(1).pdf
Title: global tectonics 2016-17 chapter 2
Author: stoecheb

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Geotektonik – Global Tectonics

CHAPTER 2

Plate motion and plate
boundaries

relative plate motion
V1/2

v

V1/2

relative plate motion
V1/2

v
V1/2 ??

V1/2

relative plate motion
V1/2

v

V1/2

V1/2 ??

Seafloor spreading is approximately symmetric in
many cases, but lithospheric growth along divergent
plate boundaries can be slightly asymmetric

„absolute“ plate motion

u

„absolute“ plate motion

u

Presumption is a global „hot spot reference
frame“ – but this concept is obsolete. Hot spots
move relative to each other…. (not unexpected)

two approaches to relative plate motion
(1) age distribution of oceanic lithosphere
(2) high resolution geodetic methods


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