Page 110 - Carbonate Platforms Facies, Sequences, and Evolution

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Age
compare
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(1987)
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clastics
depositional
carbonates,
Unit
marine
DEPOSITIONAL
of middle
VERSUS
and/or
deposited
which
scribed in this paper from
and southern North
depositional
sequences,
aggradational-progradational
CATALAN BASIN
the
pass
Sea.
Triassic
transgression
CYCLES:
F.
each
up
systems
evaporites,
EUSTASY
into
LST
into
the
tracts
carbonates.
beginning
'
of
sedimentation
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Calvet, M.E.
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TECTONIC S
lutite-carbonate­
de­
broadly transgressive sequence of onlapping shallow­
overlain by a
with
(see Fig. 21), which is derived from
This
pattern is similar to that in the Triassic of the German
It is instructive to
highstand
the
data from Svalbard, the Dolomites of Italy and the
fluvial Buntsandstein, but cycle 1.5 could correspond
1.3 and 1.4 of Haq et al. cannot be recognized in the
Catalan
evaporite unit in the upper part of the Buntsandstein
Salt Range of Pakistan. The third-order cycles 1.2,
Catalan Basin with the global sea-level curve of Haq
the Catalan Basin is of
3. 1
1.4
1.5
,1 .2
1.3
2.2
2.1
1. In
The
major
extent
LST-2,
HAO,
positional
fact,
tinguished:
succeeding
and
Relative change of
TST-2
this
Tucker and J.M. Henton
underlying
Middle
and
sequence
transgression
1
HARDENBOL
Depositional sequence
and
237
232
242
245
significance.
&
in
control
which
HST-2,
the
on
Cycle
Upper
Muschelkalk, that is the TST-1
VAIL,
would
2.1
TR
HS
19 87
deposited
Catalan
of
base-level
the
evaporitic unit corresponds
and HST-1
Haq
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Muschelkalk,
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Basin.
to
et
correspond
Chronostrat.
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early Triassic (prior to and during de­
third-order cycle 2.2, although there is a small dif­
ference in age with respect to the upper boundary.
Basin, three phases of crustal extension can be dis­
of de­
Fig. 21. Comparison between the Triassic of the Catalan Basin and the proposed sequence stratigraphy of Haq et al. (1987).
the
within the Catalan Basin is of considerable interest
changes
in view of the discussions of eustatic versus tectonic
(1987; Fig. 21) would appear to correspond to the
and marked the beginning of Depositional sequence
controls on relative sea-level changes. In the Catalan
position of the Buntsandstein), Anisian-Ladinian
1 is thus at least of regional
North Sea, which was deposited following the first
to
Soiling-Rot Halite of the German Basin -southern
The
with
Lower
transgression from Tethys. The lower boundary of
al.