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Journal of the Geological Society

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Eocene initiation of Ross Sea dextral faulting and implications for East Antarctic neotectonics

¹ Dipartimento di Scienze Geologiche, Università Roma Tre, 00146 Roma, Italy (e-mail: rossetti@uniroma3.it)
² Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, 34010 Trieste, Italy
³ FB Geowissenschaften, Universität Bremen, 28334 Bremen, Germany
⁴ Istituto di Geoscienze e Georisorse–CNR, 56124 Pisa, Italy
⁵ Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hannover, Germany
⁶ Dipartimento di Scienze della Terra, Università di Pisa, 56126 Pisa, Italy

The Ross Sea region of the East Antarctic plate provides evidence for intraplate tectonic activity in Cenozoic times. Still unresolved are the cause, timing and kinematics of this intraplate tectonism. By integrating and discussing the different (kinematic and temporal) signals of Cenozoic tectonism, intraplate dextral shearing is recognized as the main tectonic regime controlling the structural architecture of the Ross Sea region from the Mid-Eocene (c. 40–50 Ma) onward. We speculate that propagation and persistence of this tectonic regime through time constitutes a feasible seismogenetic framework to explain past and current tectonism in the Ross Sea region.

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