Page 198 - Carbonate Platforms Facies, Sequences, and Evolution

#4
184
This
core
their
thick
1,
laceous
1870
1873
1868
1872
1867
186Q
1871
also
1864
1866
�
�
�
�
cap
well
bindstones.
Montejunto
into deeper
Barreiro #2
Tubiphytes-
CORE 1
which
occur
�RUDSTONE
above
is
PACKSTONE$
BOUNDSTONE
water,
MICROSOLENID
WACKESTONE$
1981
1985
1988
1984
1986
1989
1987
1983
1980
1982
incorporation
D LIME MUDSTONE
the
within
formation
encountered
along
CORE 2
into
progradation over basinal
this
composed
�
�
than
buildup.
in a deeper-water mud matrix.
the
half
facies.
well,
with in
breccia formed of shallow-marine
that
P.M.
the
�DOLOMITE
entirely
These
CORE 3
The
BOUNDSTONE
POROID HEADS
of
• BAROQUE DOLOMITE
occur
CORAL I STROMA TO -
[[[]] SPONGE-THROMBOLITE
suggesting
wackestones.
penetrated
thickness
2351
2350
2349
2348
2355
2356
2357
2354
2352
2353
Ellis, R. C.L.
.
�
�
�
EtJd.:;::i
c:r;::;l
mound stage is represented by light, fine­
initial argil­
argillaceous limestone breccias and packstones, re­
4) float within it, some of which were leached before
The
Barreiro #4. All three units described from Barreiro
within
situ thrombolitic
some
(largely fine-grained association 4, and some 6) set
of
limestone
limestone clasts
presenting the deposits of debris and turbidity flows
wackestones are overlain by a series of
by
Shales and allochthonous limestones form a 150m
grained bioclastic wackestones and lime mudstones
PORES
CORE 4
2364
2361
2358
2366
2359
2360
2365
#2,
2363
2362
junto
stones
,.-------A-----
(ARG. POOR LMSTS.)
SUTURED STYLOLITES
Barreiro
this
HORSETAIL STYLOLITES
Wilson and R.R.
(ARGILLACEOUS LMSTS.)
� ONCOLITIC WACKESTONE
contammg
mudstones
Barreiro #1
wackestones
#2
well
oil-impregnated
with
limestones
and
(cores
Leinfelder
diagenetic anhydrite.
are
numerous
#4.
contains
thrombolitic bindstones.
Fig. 12.
8-12).
more
numerous
thin-bedded
Only =
Dark,
siliceous
The
thin
carbonates
basinal
(core 6) are followed by light,
sponge
than
overlying
argillaceous
similar
taken from Barreiro #4. The
buildup are shown in Fig. 13.
packstones
to
Summary logs of cores
positions of the cores within the
those
50 m of the shallow­
have moderate vuggy porosity with numerous oxi­
Monte­
are formed of fossiliferous packstones and wacke­
wacke­
spicules,
the
fossiliferous
and
ostracod-charophyte
Caba¥OS formation at Montejunto. These consist of
wackestones with good vuggy porosity (cores 3-4),
Situated in a more basinal location than Barreiro
by deeper-water shales, limestone breccia beds and
dized oil shows. As in Barreiro #4, these are overlain
water carbonates occur in Barreiro #2 (core 7), and
stones with in situ heads of corals. The packstones
associated with argillaceous breccia beds and massive
in