Page 13 - Carbonate Platforms Facies, Sequences, and Evolution

Sardinia
Sardinia
tinguished:
is
Mb
the
Mb
Iglesiente-Sulcis
PUNTA
MANNA
MATOPPA
CEROI DE
two
segment
GEOLOGICAL
of
the
zoic sequence in Italy is exposed.
sedimentary
-
to the Axial Zone (Carmignani et al.,
SARDINIA
SETTING
1-
_l
0
cycle�
w
0
<(
are
1986b).
The Iglesiente­
Hercynian chain where the most complete Palaeo­
dis­
Meso-European
Sulcis region in southwestern Sardinia corresponds
Lower Cambrian to Lower Ordovician
to the External Zone of the Hercynian chain, Central
Sardinia to the Nappe Zone and northern Sardinia
In
--------
EARLY
OPEN
-CLIMATIC
are
LIMESTONE
thrusts,
MARINE
DOLOMIT E
produced
CHANGE-
'
...
so
1-
<(
a:
missing,
_l
o
LL
0...
...
'
that
and
Cambrian-Lower
the
the
Carbonate deposition during early rifting, Italy
oblique transform rifting
Fig. 2. Stratigraphic columns of Lower Palaeozoic in Sardinia and Lower Mesozoic in Tuscany.
TUSCANY
present
Ordovician
(Vai
sequence
gentle E-W trending
&
deposits (Carmignani et al. , 1986b).
folds.
tectonic
basinal
consists of
Cocozza,
pattern
rise to tighter N-S trending folds and local over­
In southwestern Sardinia, the Sardic phase, inter­
and Upper Ordovician to Lower Carboniferous sep­
1986),
During the
preted as a transpressional episode of a Caledonian
of
Hercynian orogeny, three deformational phases gave
age. In Central Sardinia, early Cambrian carbonates
arated by the Sardic angular unconformity of Arenig
siliciclastic
Middle
11