Thursday, 30 August 2007
4.PS-113

The eclogite facies rocks from Antarctica and Tasmania: different geodynamic settings within the Cambro-Ordovician Ross/Delamerian Orogen

Rosaria Palmeri1, R. Chmielowski2, Sonia Sandroni3, Franco Talarico4, and Carlo Alberto Ricci4. (1) Sezione Scienze della Terra, Museo Nazionale dell'Antartide, Via del Laterino 8, Siena, 53100, Italy, (2) Centre for Ore deposit Research, University of Tasmania, Private Bag 79, Hobart, Australia, (3) Dipartimento di Scienze della Terra, Università di Siena, Laterino, 8, Siena, 53100, Italy, (4) Dipartimento di Scienze della Terra, University of Siena, via Laterina 8, Siena, Italy

Eclogite facies rocks have been described from northern Victoria Land, Antarctica  and from NW Tasmania as part of the Cambro-Ordovician Ross-Delamerian orogen. New petrological data yield lower P and T (625-750 °C; 1.3-1.7 GPa) and lower dP/dT of Tasmanian eclogites compared with the UHP mafic, ultramafic and felsic rocks of the Lanterman Range (764-820 °C; 3.2-3.3 GPa). The different P-T conditions and regimes suggest different tectono-metamorphic evolution of the two complexes possibly reflecting different geodynamic settings along the same convergent belt developed at the paleo-Pacific margin of Gondwana.

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