Page 111 - Carbonate Platforms Facies, Sequences, and Evolution

late
ment
nized
(prior
(1985).
Viking
Keuper
to
deposition
faults
and
Graben.
facies).
(the
throughout
within
The
during
Permian-Scythian
the
the thickness variations in the
western
provided by the considerable
Fig. 22. Schematic stratigraphy of
the Catalan Basin Triassic showing
evidence
and Keuper. From Marzo & Calvet
Buntsandstein, Middle Muschelkalk
Catalan
Buntsandstein)
extension
deposition
for
Europe
of
B
K
Basin
with
phase
and
the
rifting
sw
is
Bai x
is
in
resulted
["
thickness (see Figs 22 & 23}. Movements on base­
recog­
the
best
Muschelkalk} and Carnian (during deposition of the
sequences
changes in sediment
northern North Sea resulted in the formation of the
in
Middle
great thickness variations, especially in clastic and
changes are even more marked (Jurado, 1989}. The
This rifting initiated coarse clastic
evaporite units. In the Ebro Basin, lateral thickness
structures. The cessation of this extension is marked
reaching several kilometre thickness in some graben
50Km
in
I
close
times
the
A
-
to
in
-
00 0
A A
· :-:-: · ·:··:
:::rr:r::
:z=z
""""
case
I
Ebre- Prioratl Prades 1
I
I
Extension
the
in
Reel
sea-level,
of the
Middle Triassic carbonate ramp systems, Spain
Catalan
Dolom ites
Gaia
Evapo rites
and
Limestones
AAA
AAA
AAA
Sa ndstones
Middle
postrift sediments above.
Sh ales /M arls
St rom atolites
Lower
Co nglomerates
the
complexes
Basin
\
\
was
Garral
Muschelkalk
differential
Muschelkalk
and
the
I
I
·. ·.·.
I
I
accompanied
NE
Montseny
B
overlain by marls and then the Rot Halite. This un­
much more uniform across the Catalan Basin, and
conformity separates synrift sediments below from
Ebre-Priorat Domain for example, Fig. 22; Marzo
101
extrusion of basaltic lavas. Sedimentation took place
by the Hardegsen Unconformity, prominent in the
by
Keuper
& Calvet, 1985). By way of contrast, thicknesses of
controlled by basement faults led to thick sequences
of evaporites in the sub-basin centres (as in the Baix
the Lower Muschelkalk and Upper Muschelkalk are
subsidence
facies
southern North Sea and German Basin, and this is