Abstract
The age, petrography, chemical composition, and structure of the Antipodes Islands volcanics are established as important criteria in deciding the nature of the Antipodes fracture zone, which delineates the eastern margin of the New Zealand plateau, and which separates it from the Southwestern Pacific basin. Reasons are given for preferring tear-faulting to rifting as the dominant movement along the fracture zone: an important issue in determining the direction of migration of sialic crustal blocks in the southwest Pacific during Cenozoic times.
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