Mantle plumes and Antarctica-New Zealand rifting: Evidence from mid-Cretaceous mafic dykes

Journal of the Geological Society | July 1, 1999| | Copyright

Abstract: Ocean floor magnetic anomalies show that New Zealand was the last continental fragment to separate from Antarctica during Gondwana break-up, drifting from Marie Byrd Land, West Antarctica, about 84 Ma ago. Prior to continental drift, a voluminous suite of mafic dykes (dated by Ar-Ar laser stepped heating at 107 +/- 5 Ma) and anorogenic silicic rocks, including syenites and peralkaline granitoids (95-102 Ma), were emplaced in Marie Byrd Land during a rifting event. The mafic dyke suite includes both high- and low-Ti basalts. Trace element and Sr and Nd isotope compositions of the ...

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