Strain variations within a major carbonate thrust sheet of the Apennine collisional belt, northern Calabria, southern Italy
Published:January 01, 2007
S. Vitale, A. Iannace, S. Mazzoli, 2007. "Strain variations within a major carbonate thrust sheet of the Apennine collisional belt, northern Calabria, southern Italy", Deformation of the Continental Crust: The Legacy of Mike Coward, A. C. Ries, R. W. H. Butler, R. H. Graham
Download citation file:
Mike Coward’s seminal work on strain within thrust sheets clearly showed how understanding crustal scale deformation associated with orogenesis requires a knowledge of both: (1) deformation associated with major thrusts and/or high-strain shear zones, and (2) finite strain states within the (usually large) surrounding rock volumes. In this study, the strain variations within a major, far-travelled thrust sheet internally deformed at very low-temperature, sub-metamorphic conditions, are analysed. The studied rocks belong to the thick carbonate succession of the Apennine Platform, which constitutes a major tectonostratigraphic unit of the southern Apennines. Finite strain analysis, besides quantifying the relative importance of different deformation mechanisms and the role of matrix and object strain, points to the existence of both vertical and horizontal strain gradients. These are probably controlled by both heterogeneous shear deformation associated with NE-directed tectonic transport and sedimentary carbonate facies distribution. The relative position with respect to the main overlying tectonic contact and the occurrence of a barrier to fluid flow, represented by siliciclastic beds located at the top of the carbonate succession, are also likely to have played an important role in the development of the observed regional strain gradients. On the metre scale, deformation appears to be partitioned into domains of quasi-coaxial and dominantly non-coaxial strain, controlled by different degrees of strain localization in texturally different stratigraphic layers.
Figures & Tables
Deformation of the Continental Crust: The Legacy of Mike Coward
This Special Publication, in memory and celebration of the work of Professor Mike Coward, is about the deformation of the continental lithosphere. The collected papers discuss geometry, structural principles, processes and problems in a wide range of tectonic settings and thereby reflect the breadth of Coward's interests. They encompass the evolution of Precambrian basement gneiss terrains, the geometry and evolution of thrust systems, basement involvement and structural inheritance in basins, syn-orogenic extension, salt tectonics, the implication of structural evolution on hydrocarbon prospectivity and structural controls on mineralization. Examples are drawn from the Lewisian and Moine Thrust Belt of NW Scotland, the Italian Apennines, NW Himalayas, the Cyclades, Oman, Zagros Mountains, Colombian Cordillera, Carpathians, North Sea, offshore Brazil, regional studies of the Irumide Belt (central Africa), Taurus Mountains (Turkey), greater South America, and from the Witwatersrand Basin of South Africa and the Antler Orogeny of SW USA.