Page 106 - Carbonate Platforms Facies, Sequences, and Evolution

96
The
Unit
In
shallow
is
oncolitic
the
Santisteban
breccias ( sp).
Rojals
ramp
&
Baix
lagoonal-marsh
centimetre-scale
to
Sedimentary model
oolitic
interpreted
(lagoonal-marsh-mud
the Prades Mountains.
deposits)
as
Taberner
fiat
and
Ebre-Priorat
hypersaline
evaporite mold
grainstone-packstone.
(1987)
agitated
the
F.
deposits)
resent a general regressive sequence.
casts;
Domain
These
studied
limestone-dolomite
supratidal
shoal
mentary sequences in the Various domains.
the
Capafons
the
together
facies
(sb), intertidal planar stromatolites (i) and supratidal
facies
Calvet, M.E.
of the Upper Muschelkalk composed of subtidal shales
with chert and celestine nodules; and (9) bioclastic­
rep­
may have led to the development of different sedi­
developed in the three domains and together rep­
sedi­
deposits.
interpreted as a high-energy tidal deposit, and the
deposited on a shallow ramp. These two units are
resent a general transgressive cycle. However, after
is
transgressive sequence continued with the Rasquera
Unit in deep ramp facies. The Tivissa Unit (deep to
mentology and diagenetic processes of this unit in
the deposition of the Benifallet Unit, some control
Benifallet Unit consists of a lagoonal deposit in the
lower part and shoal sequences in the upper part,
are
initial
through
and locally some thinning-upward sequences (tidal
channel deposits) are present. Broadly, the Capafons
Fig. 17. Shallowing-upward sequence in the Capafons Unit
(8) breccias
ordered into shallowing-up sequences (Figs 13 & 17)
Unit
the
and
level
Orti,
Basin
tracts
posed
Rojals
started
years).
proach
sitional
ficulties
quences
followed
then
timescale
Capafons
inter-reef
Peninsula
for
1979) and
homoclinal
and
lapping the
represented
of sea-level
in
IN
1987).
for
with
there
the
In this paper,
(second-
the
Unit.
(e.g.
following
areas,
the
the
transgressive
Marzo
has
ramp,
philosophy
reefs.
Tucker and J.M. Henton
THE
sequences
In
by the
regressive sequence
and
of several
and Capafons Units.
&
Esteban
the
in
can
Benifallet
is
Alcover
the
DEPOSITIONAL
The
to
been
&
Alcover
Catalan
CAT
interpreting
be
the
Rojals
sequence
sitional systems respond to
onlapping
Mid-Triassic
Calvet
Unit
regional tectonic effects, the
Units,
much
is
Unit
two depositional
several
Robles
barrier-bank
Garrido-Megias
Basin
and
ALAN
was
third-order,
regressive
applied
strata
and
Triassic
depositional
&
(in
represented
tens
SYSTEMS
by the La Riba reef Unit.
type
into a homoclinal ramp with buildups.
of
to
of
the
sedimentary
emphasis
Gaia-Montseny
continues
the
and
and Benifallet
BASIN
depositional
the
by the
represented
according
deposited
Anadon
sequence
on
systems
operating
These
eventually
Villena,
by
to
into
in
(1985) established
of millions
Units
TRACTS
on
se­
over­
major changes in sea­
Several attempts have been made to define depo­
eustatic changes of sea-level as a fundamental con­
reflection profiles and a consideration of how depo­
Although with the seismic stratigraphic ap­
sequences are pro­
Tucker (1985). The model proposed started with a
which
complexes were terminated by subaerial exposure,
the
sedimentary model of Ahr (1973), Read (1985) and
reefal
the
change remains one of the major dif­
In the Prades Domain the transgressive sequence
Domains,
1977;
depositional sequence concept of Vail et al. (1977).
succeeding
tracts
sequences
Iberian
of global eustatic from regional tectonic mechanisms
is
sequences regardless of how the relative rises and
the
evolved
Catalan
Querol
a
the
Overall these Upper Muschelkalk carbonates, like
those of the Lower Muschelkalk, belong to the ramp
global
Bally (1987) and papers in Wilgus et al. (1988). This
has been derived largely from the study of seismic
et al.,
philosophy of Haq et al. (1987), Vail et al. (1987),
of
trol, with little attention, at least in the early days, to
sedimentary
systems
falls of sea-level were brought about. The separation