Geology Reference
In-Depth Information
Fig. 6.37
Reconstruction at 57 Ma (C25 - Thanetian),
illustrating the acceleration field of Eurasia (
red arrows
)
and the global plate velocities (
black arrows
).
P
EUR
is
the pole of acceleration of Eurasia.
Black
areas are LIPS.
Coastlines are overlaid for reference
Fig. 6.38
Reconstruction at 39 Ma (C18 - Bartonian),
illustrating the acceleration field of Nazca (
red arrows
)
and the global plate velocities (
black arrows
).
P
NAZ
is
the pole of acceleration of Nazca.
Black
areas are LIPS.
Coastlines are overlaid for reference
The next episode of traction occurred between
C18 (
39 Ma - Bartonian) and C13 (
33 Ma -
early Rupelian) and affected the Nazca plate
(Fig.
6.32
). It consisted into an eastward acceler-
ation (Fig.
6.38
), accompanied by a remarkable
change of the stage pole. At the end of this stage,
the Pacific plate probably started a phase of
westward acceleration and increased spreading
rate along the EPR, which lasted at C6 (
20 Ma -
Burdigalian) (Figs.
6.35
and
6.39
). The last rec-
ognized episode of traction occurred once again
in the Pacific area and consisted into a southward
