作者: Chiara Frassi , Rodolfo Carosi , Chiara Montomoli , Richard D. Law
DOI: 10.1016/J.JSG.2009.10.001
关键词: Vorticity 、 Sinistral and dextral 、 Transpression 、 Shear zone 、 Seismology 、 Orogeny 、 Geology 、 Simple shear 、 Shear (geology) 、 Metamorphic rock
摘要: Abstract Quartz c-axis fabrics, vorticity of flow and deformation temperatures were analyzed in samples collected the central sector Variscan inner zone Sardinia (Italy). In order to constrain kinematics exhumation medium- high-grade metamorphic rocks during D2 post-collisional deformation, we investigated two shear belts with opposing senses. These are developed parallel trend which marks boundary between complexes. Our data suggest that sinistral belt initiated early stage a simple-shear-dominated regime, whereas dextral later pure-shear-dominated regime. We document general non-coaxial regime contemporaneous pure simple components. Geometrical relationships reveal operation oblique extrusion compressive where coaxial component acted sub-horizontal orthogonal axial zone. Changes kinematics, strain geometry occurred may be related orogen-parallel displacement caught up orogeny.