global tectonics 2016 17 chapter 9 .pdf

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Title: global tectonics 2016-17 chapter 9
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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


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