Geology Reference
In-Depth Information
Fig. 18.1
Structural map of the Aragonese-Catalan Pyrenees
(modifi ed after Capote et al.
2002
) . The present-day Tremp-
Graus and Ager Basins are located south of the axial zone in
the central and eastern Pyrenees and south of a structural diver-
gence axis in the west-central Pyrenees. The eastern boundary
of the Central Pyrenees is formed by the NE-SW oriented
oblique Segre transfer zone and the western boundary is formed
by the NW-SE oriented oblique Boltaña anticline. The southern
margin is formed by the E-W oriented frontal thrust of the
Sierras Marginales (SM). B Bóixols thrust sheet, C Cadi thrust
sheet, M Montsec thrust sheet, P Pedraforca thrust sheet,
SM Sierras Marginales thrust sheet, AB present-day Ainsa Basin,
AgB present-day Ager Basin, JB Jaca Basin, TGB present-day
Tremp-Graus Basin. Inset 1: geological map of Fig.
18.10
; inset 2:
geological map of Fig.
18.11b
Fig. 18.2
(
a
) Partially restored cross-section of the crust
through the central Pyrenees at the location of the ECORS pro-
fi le (Choukroune et al.
1989,
1990
) illustrating the tectonic
style and the three main imbricated thrust sheets (Bóixols,
European Plate and
arrows
indicate estimated total conver-
gence.
NPF
North Pyrenean Fault (Modifi ed after Beaumont
et al. (
2000
) ). (
b
) Enlargement of the
boxed area
in
a
illu-
strating the position of the present-day Ager and Tremp-Graus
Basins
