Geoscience Reference
In-Depth Information
Figure 8.9.
Subduction
zones are identifiable as
areas of high density
within the mantle, shown
here for the present day
and 56 Ma ago. Locations
of density anomalies were
calculated by mapping
subduction zones in the
hotspot reference frame
and allowing slabs to sink
into the mantle, taking
into account the major
increase in viscosity at the
670-km boundary.
(Lithgow-Bertollini and
Richards, The dynamics of
Cenozoic and Mesozoic
plate motions,
Rev.
Geophys.
,
36
, 27-78,
1998. Copyright 1998
American Geophysical
Union. Reprinted by
permission of American
Geophysical Union.)
