Page 3 - Abate_ali_2003

Sirilia11 jurassicphysiography 17
M Ac HRE8
VR se TP·SA HY
,\>llllm
Oogg"
"<' """" 1.:·_:'2;·:;
~ Low:. ltMid
UpperTRIAS
PELO R T
M.tlm
111 Uppc:r
<
::; Low. &Mid
UPf'"TRIAS
nodular ho lopdagic limestones or hemipelagic radiola·
rites and argiUites.
This paleoenvironmental mosaic was included
in differcnt paleogcographic frames by some Authors
(Scandone et al. 1977; Catalano & O'Argenio 1978;
1982; Montanari 1989, 2000; Abate et al. 1993, 1997,
2002; Vai 1992)
T he sedimentalogical difference between the
Maghrebian and tbe Peloritanian domains dccrcascd in
rhe Late Jurassic times (Calpionella-bearing limestones
in drowned zones) cven though exceptions may be found
in the Panormide domain (Ellipsactinia-bearing deposits)
and in Peloritani ("Novara succcssion" with Clypeina jll-
rassica-bearing carbooates). Since the Late Triassic large
amounu of allodapic and intrabasinal breccias dcposited
in the basi ns. ln ma.ny Maghrebian sectors (Fig. 3) pil-
low-lavas also occurred, suggesting an incipient rift, lat-
er abortcd.
Structures and paleophyslographlc analysis
!t is necessary to distinguish autochthonous and
allochthonous Jurassic rocks, either in deformed or un-
deformed sites. The srructural position needs to be veri-
fied, to discriminate wbethtr the rocks are true tcctonic
Klippen or cf are resedimemed exotic materials. For in-
stance,Jurassic neritic rocks from Vicari, Roccapalumba,
Pictrecadute in Western Sicily are remains of a Nappe
overthrus ting the Sicanian thrusts. [ns tead, lo the Sicanian
sequence, the megabreccia-swarrns with Liassic wb.ite ne-
ri tic limestones embedded in the white Cretaceous "Sca-
glia" (e.g. Adranone, near Sciacca and in the same Sica-
D Es Fig. 3 . Sc.hematic str.uigraphic col·
unms or the Jurnssic fac:ies
doma.ins. PP-TU • Pcepa·
normide·Tunis:i:an; PA = Pa-
normidc; 1M = Imer-ese; VR
• Vicar-ese: SC • Sic:anian,
TP-SA = Tnpl.neie-S:accerue:
NV = Nova.r.t Sicula; AL •
Ah; TA ~ T:tormina; GA =
GaJati; LG = l.oogi.
nian basin) are resedimented, Same resedirnentation of
J urassic rocks in siliciclasùc Miocene flysch occurs by
Case Tita near Mistretta.
In the Peloritani, near Rocca Novara and Forza
d'Agrò, Tithonian whire clasts were resedimented as a
breccia-like lo thc Oligocene varicoloured marls; many
blocks of condensed Rosso Ammonitico are included in
the "ScagGa" as well as in Miocene siliciclastic turbidites,
suggesting a repeated mass slide.
Here we deal with the Jurassic domains, from the
"internai" to "cxtcrnal" ones, according to t.he modero
structural organisation of the deformed rock assemblag·
es in a "cylindristic" framework of south-verging over-
thrusts, with a moderate transversal strike-sGp tecton_ics.
M a g h r c bi des
a) Prepanormide (PP)-A_e.gusean Tunisian (TU
eg.) ("Aeguseao" lmm.. ili!;. ançient Greek. generic Ae·
~ Co.t Egadi jslands) , T he name is an informai com-
promise. "Prepaoormide" was born as a nomen nudum
(Catalano & O'Argenio 1982) suggesting another palc-
odomain between an internai realm (probably the "oce·
anic" Sicilide of Ogniben 1960) and an external Maghre-
bian-Trapanese realm,
lts stratigraphy was later considered analogous to
that of the Tunisian realm (Catalano 1987). One of us
{Montanari 1989) suggested therefore to change "Prepa·
normide,. into •'Tunisian", because of:
- the new opinions and data about the belonging
of such domain to North-Africa, as Fabiani & Trevisan
(1940} and Ruggicri (1973) had already suggested;
- stratigraphic differences from the "true" Panor·
mide;