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The Sardinia–Corsica microplate and its role in the Northern Apennine Geodynamics: new insights from the Tertiary intraplate strike-slip tectonics of Sardinia

Oggiano, Giacomo and Funedda, Antonio and Carmignani, L. and Pasciu, S (2009) The Sardinia–Corsica microplate and its role in the Northern Apennine Geodynamics: new insights from the Tertiary intraplate strike-slip tectonics of Sardinia. Italian Journal of Geosciences, Vol. 128 (2), p. 527-539. eISSN 2038-1727. Article.

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DOI: 10.3301/IJG.2009.128.2.527

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Abstract

The behaviour of Sardinia and Corsica within the Alpine-Apennine orogenic events is not considered in univocal way; different hypotheses have been proposed, disregarding any eventual effect on the internal structuration of this piece of European crust.Identifying the mechanism and age of the prominent strike–slip tec-tonics in Sardinia and Corsica allows us to bear new insights on the relationships between the south European crust and Adria plate. Syntectonic Oligocene-Aquitanian deposits fi ll some intracratonic basins in Sardinia. They developed in correspondence with releasing bends that affect the sinistral strike-slip faults, confi ning the time span during which this tectonics was active.Thrusts and folds involving the Mesozoic and Lower Cainozoic cover are not ubiquitous in Sardinia, they are mainly localised along de-formed corridors in the NE part of the Island where deeply shortened Cainozoic conglomerates were involved in the wrench-thrust faults which, in some case, led the basement to override the Mesozoic cover. The association of these structures to restraining bends is documented, so that they are the coeval transpressive counterparts of the strike-slip basins.Confi ning within an Oligocene-Aquitanian time interval most of the Tertiary strike-slip tectonics of Sardinia and Southern Corsica involves the following consequences:i) no E-W extension, leading to a N-S trending rift (in present-day coordinates), was active in Sardinia and Corsica during Oligocene-Aquitanian times;ii) the so-called Sardinia Rift is an assemblage of shallow asymmetric basins, trending N150, which developed during the late Burdigalian-Langhian, i.e. contemporary to the onset of the collapse of the North Apennine and Alpine Corsica orogenic wedge and to the opening of the North Tyrrhenian Sea;iii) the Oligocene-Aquitanian strike-slip tectonics in Sardinia is con-sistent with the deformation of an hinterland involved in collision; this was the collision between Adria and Europe that led to the building of North Apennine;iv) the collisional event predates the drifting of the Sardinia-Corsica crust and the opening of the Gulf of Lion-Liguro-Provençal.

Item Type:Article
ID Code:4772
Status:Published
Refereed:Yes
Uncontrolled Keywords:Sardinia, North Apennine, strike-slip tectonics, Oligocene-Aquitanian, Central-western Mediterranean
Subjects:Area 04 - Scienze della terra > GEO/03 Geologia strutturale
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:Società geologica italiana
eISSN:2038-1727
Deposited On:05 Nov 2010 13:02

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