Link between SSZ ophiolite formation, emplacement and arc inception, Northland, New Zealand: U-Pb SHRIMP constraints; Cenozoic SW Pacific tectonic implications

@inproceedings{Whattam2006LinkBS,
  title={Link between SSZ ophiolite formation, emplacement and arc inception, Northland, New Zealand: U-Pb SHRIMP constraints; Cenozoic SW Pacific tectonic implications},
  author={Scott A Whattam and John Malpas and Ian E. M. Smith and Jason Richard Ali},
  year={2006}
}
Abstract New U–Pb age-data from zircons separated from a Northland ophiolite gabbro yield a mean 206 Pb/ 238 U age of 31.6 ± 0.2 Ma, providing support for a recently determined 28.3 ± 0.2 Ma SHRIMP age of an associated plagiogranite and ∼ 29–26 Ma 40 Ar/ 39 Ar ages ( n  = 9) of basalts of the ophiolite. Elsewhere, Miocene arc-related calc-alkaline andesite dikes which intrude the ophiolitic rocks contain zircons which yield mean 206 Pb/ 238 U ages of 20.1 ± 0.2 and 19.8 ± 0.2 Ma. The ophiolite… CONTINUE READING

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