Kinematics and vorticity of flow associated with post-collisional oblique transpression in the Variscan Inner Zone of northern Sardinia (Italy)

作者: Chiara Frassi , Rodolfo Carosi , Chiara Montomoli , Richard D. Law

DOI: 10.1016/J.JSG.2009.10.001

关键词: VorticitySinistral and dextralTranspressionShear zoneSeismologyOrogenyGeologySimple shearShear (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.

参考文章(89)
JAN TULLIS, JOHN M. CHRISTIE, DAVID T. GRIGGS, Microstructures and Preferred Orientations of Experimentally Deformed Quartzites Geological Society of America Bulletin. ,vol. 84, pp. 297- 314 ,(1973) , 10.1130/0016-7606(1973)84<297:MAPOOE>2.0.CO;2
Khalil Sarkarinejad, Ali Faghih, Bernhard Grasemann, Transpressional deformations within the Sanandaj Sirjan metamorphic belt (Zagros Mountains, Iran) Journal of Structural Geology. ,vol. 30, pp. 818- 826 ,(2008) , 10.1016/J.JSG.2008.03.003
C. W. Passchier, Analysis of deformation paths in shear zones International Journal of Earth Sciences. ,vol. 77, pp. 309- 318 ,(1988) , 10.1007/BF01848692
R. Carosi, A. Di Pisa, D. Iacopini, C. Montomoli, G. Oggiano, The structural evolution of the Asinara Island (NW Sardinia, Italy) Geodinamica Acta. ,vol. 17, pp. 309- 329 ,(2004) , 10.3166/GA.17.309-329
E. Druguet, C.W. Passchier, J. Carreras, P. Victor, S. den Brok, Analysis of a complex high-strain zone at Cap de Creus, Spain Tectonophysics. ,vol. 280, pp. 31- 45 ,(1997) , 10.1016/S0040-1951(97)00137-6
W.A. Sullivan, R.D. Law, Deformation path partitioning within the transpressional White Mountain shear zone, California and Nevada Journal of Structural Geology. ,vol. 29, pp. 583- 599 ,(2007) , 10.1016/J.JSG.2006.11.001
Shoufa Lin, Dazhi Jiang, Paul F. Williams, Transpression (or transtension) zones of triclinic symmetry: natural example and theoretical modelling Geological Society, London, Special Publications. ,vol. 135, pp. 41- 57 ,(1998) , 10.1144/GSL.SP.1998.135.01.04