Review and updating of the Moscovian to Artinskian marine rocks in peninsular Italy

5 Pages·1997·1.3 MB·English

by  Gian Battista Vai

Review and updating of the Moscovian to
Artinskian marine rocks in peninsular Italy
Mario PASINI
Dipartimento Scienze délia Terra,
Via La Pira, 1-50121 Firenze (Italy)
Gian Battista VAI
Dipartimento Scienze Geologiche,
Via Zamboni 67, 1-40127 Bologna (Italy)
KEYWORDS
Pasinj M. & Val G. B. 1997. — Review and updating of the Moscovian to Artinskian marine
Bashkirian,
rocks in peninsular Italy, in Crasquin-Soleau S. & De Wever P. (eds), Peri-Tethys: stratigra¬
Vereyan, phie corrélations, Geodiversitas 19 (2) : 187-191.
Kashirian.
Podolskian,
Bolorian, ABSTRACT
Kubergandian, New and previous data on the niainly marine Carboniferous to Permian
fusulinids,
sequence of the Apennine Chain and its foreland in Italy (especially Tuscany
conodonts,
corals, plus Lucania and Apulia) are summarized. Of spécial interesi is the restored
Tuscany, corrélation between a shallow-water carbonate platform and the related basin
Lucania,
with turbidites and olistostromes, pointing to the Hcrcynian outer foredeep
Apulia,
Apennincs. tectofacies.
MOTS CLÉS
Bashkirien,
Vareyen,
Kashirien, RÉSUMÉ
Podolskien,
Nous résumons ici les données, nouvelles et anciennes, qui concernent des
Bolorien,
Kubergandicn, dépôts, principalement marins, du Carbonifère au Permieades Appennins et
fusulines,
de son avant-pays italien (particulièrement la Toscane, la Lucanie et
conodontes,
coraux, LApulie), On notera tout spécialement rétablissement dhme corrélation
Toscane, entre des carbonates de plate-forme peu profonde et les turbidites et olisto-
Lucanie,
stromes liées au bassin adjacent, qui illustrent la tectonofaciès de l’avant-fosse
Apulie,
Apennins. hercynienne externe.
GEODIVERSITAS • 1997 • 19(2) 187
Pasini M. & Vai G. B.
Moscovian and Arcinskian units are emphasized Bashkiriaii'late Moscovian (Podolskian to
here within the frame of Carboniferous to Mjackovian substages) by Ferrari et al (1977)
Permian sequence of rocks. and Pasini (1978, 1980a). More prccisely, Ferrari
et ai (1977) reported two different foraminiferal
faunas from the limestone olistostrome.^j and
MOSCOVIAN (Fig. 1) from a loosc dark limestone houlder: rhe First
onc, with Profusulinella and Pseudostajfèlla, was
Fossiliferoiis marine sedimentary rocks datable to assigned to the zone 22 (or slightly younger) of
the Moscovian outcrop only in a narrow area of Marner, which is late Bashkirian to early
the northern Apennines, becween Siena and Moscovian; the second one was tematively assi¬
Grosseto (Monticiano-Roccastrada area, gned to the late Moscovian: Corals [Spirophyllum
Tuscany). Two main sequences hâve been sépara- rntiltilamellatum de Groot) and conodonts
ted (Cocozza et ai 1987); a northern onc along (Idiognathodus delicatia Gunnell) yicldcd in the
the Farma river and a scrnthern one in the San sajnc houlder were assigned an early Moscovian
Antonio mine area. and a late Moscovian âge respectively.
Limcstonc.s from the upper part of the
The Farma river sequence, becween Contrada Formation show Pustella praetypica Safonova of
Carpineca and 170 ra a.s.l., near Ie.sa (43°5’N - the Podolskian substage (late Moscovian). The
11°16’E) includes: (1) rhe Risanguigno forma¬ Farma formation is more than 500 m thîck
tion containing Devonian silidfied limestone (Conû et ai 1991).
(Bagnoli & ’Fongiorgi 1980); (2) a chert forma¬
tion (lyditic radiolarites) of possible Dinantian The San Antonio mine sequence is located near
3geî (3) the Carpineia formation (Cocozza et ai Casai di Pari (Grosseto) (43"3’N - 1 riTE) and
1974) of late Visean to Moscovian âge; and (4) include. (1) the Carpineta formation (lacking
the Farma formation (Cocozza et ai 1974) of olistolichic inclusions herc); (2) the San Antonio
late Bashkirian to late Moscovian âge. This limestone formation, 200 m rhick, of late
sequence, severely tecronized and largely ovcrtur- Bashkirian to early Moscovian âge; (3) lhe paleo-
ned, is uncontormably overlain by the Permo- sol horizon with bauxite; and (4) rhe Spirifer
Triassic Verrucano Group (Cocozza et al. 1974; shales (Cocozza 1965) of late Moscovian
Conti et al. 1991). Of major interest are the (Mjackovian) lo early Cantabrian âge, which are
Carpineta and Farma formations. exposed for 2 m only,
The Carpineta formation, mainly shaly and silty The San Antonio limestone formation is a dark
with brachiopods, bivalves and plant débris, to black, shallow-water, bioclasric limestone,
contains olistolitfoc intercalations ai limestone partiy dolomitized, It contains algae and forami-
rich in erînoids, algae and loraminifera. nifera with fusulinids {Ozawaiaella ex gr.
Brachiopods suggest a late Viséan to early O. ginndis Putrja)) of early Moscovian (Vereyan
Namurian âge (Pasini & Winkler-Prins 1981) as to Kashirian) âge.
well as the Archaediscidae found in the sandy- The Spirifer shales contain Pseudostajfella cf.
silty layers (Pasini 198()b), Fîowever, the forami- sphueroideu (Hhr.) and brachiopods of latest
nifera Irom the limcstones suggest a late Moscovian-earliest Cantabrian âge (Pasini
Bashkirian to early Moscovian âge (Pasini 1978, 1980a).
1980a).
The Farma sequence is entirely basinal and
The Farma formation is a thin bedded silîcoclas- shows a systematic deepening of the sedimentary
tic turbiditc with few interposcd limestone olis- environment. The San Antonio sequence sug-
tostromes and olistoHths. Limestones contained gests an almost steady outer shelf environment
in the lower part ot the formation and probably with a short émersion disconformity in the late
identical to the San Ajitonio limestone formation Moscovian. Large parts of the cwo sequences are
(see below) hâve been dated to the late cime overlapping- Both contain the
188 GEODIVERSITAS « 1997 • 19(2)
Moscovian to Artinskian marine rocks in Italy
Pseudoendothym-Pseudostajfella association which ;tnd Eopolydiexodina sp.; therefore it was referred
supports a close relationship aiso suggested by to the P lîii-iigini Zone ot the Artinskian. Higher
olistostromes and olîsroliths supplied from the éléments of the cote, however, yielded fusulinids
shclf to the basin. assigned to the généra Cancellina, Yangkieniu and
Pseiidodolwliria, which hâve been referred to the
Kubergandian.
ARTINSKIAN (Fig. 1) The cored interval thus seems to represent a
condensed Artinsldan to Kubergimdian sequence
Clear fossil evidence of marine Artinskian rocks (Pandeli & Pasini 1990). Fhe lack of fossils
in peninsular Italy was only found in the well within the drilled deeper levels prevent an assess-
PC/33b (42“50'5n"N - ir4r30"E) drilled by ment of the total thickness ol the Artinskian
ENEL Co* on the Mt. Amiata (southern sédiments.
Tuscany). This well cored fossiliferous carbonate The Palacozoic sequence found in the well
layers, containing fusulinids from — 3Ô24.40 to PC/33b is composcd by the “A”, “B” and “C”
— 3028.40 m beneaih the surface. ’Fhe cote was formations (Fig. 1), among which the “B” for¬
made up of fivc cléments, the deeper of which mation is viewed as a tectonic wedge of pre-
included Praeparafusidina cf. lutugini (Schellw.) Viséan âge within the “A” formation. This
Fig. 1. — Mid to late Carboniferous. mainiy Moscovian, stratigraphie sections in Southern Tuscany and their interprétation (left); late
early Permian stratigraphie section from the Southern Tuscany subsurface and their interprétation (right). See Vai & Venturini {this
volume) for legend; F. fault.
GEODIVERSITAS • 1997 • 19 (2) 189
Pasini M. & Vai G. B.
sequence îs unconformably overlain by the (?) Permian âge (équivalent to the Southalpine Val
Triassic Verrucano Group, and was inrerpreted as Gardena Formation) containing some Coastal
a reverse-recumbent fold or a complex pile of lagoonal carbonate deposits in the latest Permian
Alpine cecronic wedges (Conti et al. 1991). was drilled hy Agip in the Puglia 1 well
(4P3’30"N- 16'’5*30”E).
The dan discussed siiggesr a coherenr picture of
RELICS OF THE MARINE PERMIAN a mainly marine foredeep to foreland deposits
punctuaring the Carboniferous to Permian inter-
This is a revicw of subsurface, poorly exposed, or val in rhe wide palinspastic space hidden in the
indirect évidences of Permian marine rocks in présent Italian peninsular area.
peninsular Italy.
Poorly exposed marine sedimenrs of probable
Artinskian âge are represented by small carbonate
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Moscovian to Artinskian marine rocks in Italy
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Submitted for publication on 5 April Î996\
accepted on 11 October 1996.
GEODIVERSITAS • 1997 • 19(2) 191