Page 264 - Carbonate Platforms Facies, Sequences, and Evolution

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248
11).
This
high
most
faulted
e=2j
F - - J
which
uplift,
Tavitas-Galvan
carbonate
&
trends
originated in early
PLATFORM
age on the west side
ridge,
BASIN FACIES
easterly of these,
formed
along
exist under the platform;
a
and
FACIES
the
grew westward and southward.
Cretaceous
the
Solano-Maya
barrier
time
present
west
(1984)
along
front
underlying
of
a
of
block­
The Miquihuana high ridge and its southern pro­
Aptian-Barremian evaporites were deposited (Fig.
also seen on outcrops to the north at Miquihuana.
northeast of Jalpan, Queretaro (Suter, 1984, 1987).
caused formation of some
folded in the Tertiary. The N -S Tanchipa ridge, the
N -S
the
The following is evidence that the Valles platform
three possible Jurassic basement ridges which might
pre-Cambrian gneiss and Palaeozoic schist basement
rocks are known in outcrops of Neocomian-Aptian
indicated
these are now anticlines
line on what is now its eastern margin and in time
of the platform in Sierra de
Alvarez, northeast side in the arc of Nahola, and
which
jection along the Tanchipa block correspond with a
Aptian-Barremian dolomite and limestone which is
0
3
2
-""
the
J.L. Wilson
�
arch.
<ll
water
+
El
/
50km
known.
Q
induced
0
subaerial
Guaxcama
Cretaceous
The base
Abra
and
carbonate,
Likewise,
evaporite
exposure
cut
the
carbonate
remained
off
until
a
of the El Abra
high
Agua Nueva
deposition,
and
basin
or
development
to
west, according to Suter (1984, 1987).
was
Sierra Madre Oriental (Lopez-Ramos,
the
post-Turonian.
block on the north. From
whether
1972).
It
of San Andres Formation and
Poza Rica district of Petroleos
west
west during the late Cretaceous (Smith, 1987).
encircled
Gonzales-Garcia (1969, fig. 6).
basinal Taman facies developed
south and Tuxpan-Golden Lane
between the Tezuitlan massif on
subjected
Mexicanos showing platform facies
buried only in Campanian-Maastrichtian. Presum­
Fig. 6. Upper Jurassic facies in the
It is unclear whether the early Cretaceous shallow­
Lower
across the platform is
Barremian to the north and Albian to the south and
Cretaceous evaporites thickened by diapirism (Fig.
wells contain Lower
lies west of the Triassic granite of the Tamaulipas
to
was
ably, the block was progressively down-tilted to the
and
This
At the eastern margin of the platform the top of
11; Carillo-Bravo, 1971). The age of the inception of
early Cretaceous history of
the smaller platforms, El Doctor and Toliman, is not
the
present position of the Valles platform and formed
an atoll whose centre was filled with evaporites. The