During Tertiary, the Palaeozoic crystalline basement and the Mesozoic-Lower Eocene cover of Eastern Sardinia, have been affected by a transcurrent tectonics, with contemporaneous development of both transpressive and transtensive structures. Recent geological survey carried in the Supramonte area and a more detailed structural analysis also supported by 3D geological modeling, allow us to recognise a more complicated architecture that involved both thrusts and related folds and strike-slip faults. At first the rigid basement blocks was displaced along planar, high angle reverse faults and the sedimentary Mesozoic cover was deformed as a forced-folding system. After that the sinistral strike-slip faults, and related structures, clearly post-date the thrust. Therefore, a two stage of evolution can be supposed, probably related to the same geodynamic evolution related to the deformation of a rigid crustal block with a sedimentary cover, bounded by E-W dextral transpressive strike-slip faults and NE-SW sinistral strike-slip faults, pushed-upward and toward the east.

Polyphasic deformation of the Mesozoic and tertiary succession in the Supramonte (Eastern Sardinia) / Buttau, C.; Funedda, A.; Pasci, S.; Carmignani, L.; Oggiano, G.; Sale, V.. - In: RENDICONTI ONLINE DELLA SOCIETÀ GEOLOGICA ITALIANA. - ISSN 2035-8008. - 1:1(2008), pp. 40-42.

Polyphasic deformation of the Mesozoic and tertiary succession in the Supramonte (Eastern Sardinia)

OGGIANO, Giacomo;
2008

Abstract

During Tertiary, the Palaeozoic crystalline basement and the Mesozoic-Lower Eocene cover of Eastern Sardinia, have been affected by a transcurrent tectonics, with contemporaneous development of both transpressive and transtensive structures. Recent geological survey carried in the Supramonte area and a more detailed structural analysis also supported by 3D geological modeling, allow us to recognise a more complicated architecture that involved both thrusts and related folds and strike-slip faults. At first the rigid basement blocks was displaced along planar, high angle reverse faults and the sedimentary Mesozoic cover was deformed as a forced-folding system. After that the sinistral strike-slip faults, and related structures, clearly post-date the thrust. Therefore, a two stage of evolution can be supposed, probably related to the same geodynamic evolution related to the deformation of a rigid crustal block with a sedimentary cover, bounded by E-W dextral transpressive strike-slip faults and NE-SW sinistral strike-slip faults, pushed-upward and toward the east.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/79488
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