Assetto strutturale, petrografia e geofisica della Bahía Ushuaia – Argentina

MENICHETTI, M.; TASSONE, A.; PERONI, J.I.; GONZÁLEZ GUILLOT, M. Y CERREDO, M.E.

Rendiconti della Società Geologica Italiana

Año: 2007 p. 259 - 262

In the Bahía Ushuaia outcrops dark schists and sedimentaryrocks pertaining to the Yaghán Fm of the Lower Cretaceous, arestrongly deformed by Andean compresional tectonics of the UpperCretaceous. At least two tectonic phases with isoclinal folds andslaty cleavage, deformed by mesoscopic folds and a crenulationcleavage affect the rocks. This unit hosts an alkaline pluton, composedof basic to acid terms, dominated by monzonite-syenite rocksenclosing ultrabasic enclaves. The aereomagnetic survey and magneticmeasurements integrated with the geological information permittedto modelled a N-S cross section through the area.