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Geotektonik – Global Tectonics
CHAPTER 9
convergent plate boundaries
arc magmatism
the magmatic arc is located about 100 to
150 km above the Benioff zone; the width
of the arc-trench gap thus depends on the
inclination of the subducted slab
2 HFU
1
0
1 HFU (heat flow unit) = 41.9 mW/m²
2 HFU
1
0
1 HFU (heat flow unit) = 41.9 mW/m²
asthenospheric
wedge
evolution
in time
composition as a
function of depth
of source region
evolution
in time
composition as a
function of depth
of source region
composition of
near-solidus
mantle melts
dependent on
source region
and volatiles
arc volcanism is characterized by
-
intermediate to silicic magma (e.g.
andesites and dacites) in addition to basalt
-
explosive Plinian eruptions
-
stratovolcanoes (composite or complex
volcanoes) with a spacing between
50 and 100 km
global tectonics 2016-17 chapter 9.pdf (PDF, 4.12 MB)
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