RbSr isotopic ages of Precambrian intrusives from Queen Maud Land, Antarctica

Mesoproterozoic subduction under the eastern edge of the Kalahari-Grunehogna Craton preceding Rodinia assembly: The Ritscherflya detrital zircon record, Ahlmannryggen (Dronning Maud Land, Antarctica)

“…The Ritscherflya Supergroup is a Mesoproterozoic clastic to volcaniclastic sedimentary rock sequence interbedded with volcanic sequences and intruded by syn-sedimentary to syn-diagenetic mafic sills (Roots, 1953;Allsopp & Neethling, 1970;Wolmarans & Kent, 1982;Moyes et al, 1995;Basson et al, 2004). It is located on the eastern margin of the Archaean Grunehogna craton in western DML of East Antarctica (Fig.…”

The Scotia Arc and Antarctic Margin

“…Younger cross-cutting syenitic Jörgen intrusions have a Rb-Sr age of 1030 ± 70 m.y. (Allsopp and Neethling, 1970), and volcanic rocks of the Straumsnutane Formation a Rb-Sr age of 848 ± 28 m.y. .…”