A. F. Cooper, B. A. Barreiro, D.L. Kimbrough, J. M. Mattinson; Lamprophyre dike intrusion and the age of the Alpine fault, New Zealand. Geology ; 15 (10): 941–944. doi: https://doi.org/10.1130/0091-7613(1987)15<941:LDIATA>2.0.CO;2
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The orientations of intrusive rocks from a carbonatitic lamprophyre dike swarm and the history of emplacement relative to country-rock schist structures are compatible with intrusion into tension fractures and Riedel shears formed during initiation of the dextral wrench system of the Alpine fault. New U-Pb and Rb-Sr dates indicate a late Oligocene-early Miocene time of intrusion which, in turn, suggests a mid-Tertiary history for propagation of the Alpine fault plate boundary through South Island, New Zealand.