Page 96 - Carbonate Platforms Facies, Sequences, and Evolution

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contrast
and
sequence above
typically massive
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BAIX
Hutcheon (1987).
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ll
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it.
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variety
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Vilella Baixa Unit.
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Olesa
of
(Fig.
shallow
occur at some horizons
v
Silberling
and
8),
Similar
dolomite only replaces the
Pauls Guiamets
nodules
El
with the white
burial,
(1980)
EBRE-PRIORAT
carbonate
Upper
and
Brull
and
r------- �
8 aix a Pratdip
l
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relationships
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1
facies,
DOM AIN
Units
top few metres
dolomites by
I'--
resulted
3m in
I
are
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some
Theriault
I
I
which have a normal marine fauna. The grey dolo­
within the grey dolomites.
being
to that of
size)
with euhedral to subhedral crystals, 30-200f.Lm in
partial dolomitization and a variable degree of fabric
the grey and white dolomites have been described
diameter. The style of dolomitization is much more
&
Thus the grey dolomites have
variable than the white dolomites with locally only
affected, whereas in the Baix Ebre-Priorat Domain
of the
relating to the sequence boundary at the
dark grey dolosparites,
The white and grey dolomites formed during early
all
top of the Lower Muschelkalk and/or the regressive
from
of
I
WHITE
I
IAiforja
GREY
DISCON TINUITY I/
l/
I
DOM AIN
PRADES
1/
I
La Riba1
lutite-carbonate-evaporite
(
1 Cabra
unit
I
Pontons
I
I
Lower Muschelkalk.
- K
DOLOMITES
Segues
DOLOMITES
Middle Triassic carbonate ramp systems, Spain
________..
Corbera
GAIA-M ONTSENY
v
Palle ja
LIMESTONES
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Ole& a
DOM AIN
:!: 50km
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overlain by bedded, cyctic Vilella Baixa Units,
}/
1'-
Puig Gracias
E
"
H
II
If
l{)"
NE
Fig. 7. Distribution of dolomite types in the Lower Muschelkalk with respect to the regional stratigraphy and facies.
Centelles
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Fig. 8. Massive aspect of 'grey dolomites' of Olesa Unit,
87