Analysis of a mesoscopic duplex in SW Tuscany, Italy: implications for thrust system development during positive tectonic inversion
Published:January 01, 2007
Giulio Casini, Francesco Antonio Decandia, Enrico Tavarnelli, 2007. "Analysis of a mesoscopic duplex in SW Tuscany, Italy: implications for thrust system development during positive tectonic inversion", Deformation of the Continental Crust: The Legacy of Mike Coward, A. C. Ries, R. W. H. Butler, R. H. Graham
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The advances in the field of inversion tectonics, pioneered by Mike Coward and co-workers, have shown that many thrust belts originated at the expense of pre-orogenic rift basins that originally had complex extensional architectures. These architectures are reflected by significant lateral thickness and facies changes within the deformed stratigraphic sequences. Although these changes are widely documented from the restoration of balanced sections across thrust fans, they are significantly less well documented from restoration of duplex structures. As a consequence, most available duplex models assume layer-cake stratigraphic sequences. In this contribution a peculiar mesoscopic duplex is described. This structure developed across a single irregular, previously extended quartzite layer of the Arenarie di Poggio al Carpino Formation (Upper Permian-Lower Triassic), during the Late Tertiary orogenic event that led to development of the Apennine chain. Through comparison of the analysed duplex with macroscopic analogues, it is proposed that similar structures may occur on a wide variety of scales, in the Apennines as well as in other orogenic belts.
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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.