Ross aged ductile shearing in the granitic rocks of the Wilson Terrane, Deep Freeze Range area, north Victoria Land (Antarctica)

• Main Authors: Federico Rossetti, Gianluca Vignaroli, Fabrizio Balsamo, Thomas Theye
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Deep Freeze Range; Victoria Land; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.4754; http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea001.pdf

this contribution we present a systematic study of the spatial distribution and of the kinematic and petrological characteristics of the major ductile shear zones that cross-cut the granitoid rocks of the Deep Freeze Range. The shear zones range in grade from greenschist to amphibolite facies and record compressional (?) transport directed towards the NE. Field relationships constrain the shearing event to the waning stage of the Ross-Delamerian Orogeny, due to the overprinting relationships with the emplacement of texturally-late leucocratic dykes in the region. We use these results to define the significance of these shear zones in the framework of the Ross orogenic cycle and to constrain the tectonic history of the region.