Abstract
Basalts and peridotites dredged in the Diamantina, a zone stretching west from the Australian continental margin towards Broken Ridge, have been studied. The basalts with clearly alkaline features cannot be considered related to an oceanic spreading ridge. Furthermore, the presence of peridotites with compositions close to both primitive mantle and peridotites known from continental margins strengthens the interpretation of crustal thinning at the origin of this zone. The age of this continental rifling and thus the rupture between Australia and Antarctica could be close to 93 Ma, measured on one of the basalts.
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