Earth Planets Space, Vol. 59 (No. 7), pp. 841-851, 2007
Gillian M. Turner1, Daniel M. Michalk2, Hugh E. G. Morgans3, and Jan O. Walbrecker2
1School of Chemical and Physical Sciences, Victoria
University of Wellington, P.O. Box 600, Wellington, New Zealand
2School of Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
3GNS Science, P.O. Box 30368, Lower Hutt, New Zealand
(Received October 9, 2006; Revised February 12, 2007; Accepted February 13, 2007; Online published July 20, 2007)
We report palaeomagnetic results from a 26.5 m sequence of early Miocene sediments in NW Nelson, New Zealand. Analysis of the strong, stable characteristic component of natural remanent magnetization has yielded an important record of the part of Chron 5 from ca. 18.5 to 16.5 Ma, including positive identification of the cryptochron or "tiny wiggle" C5Dr-1, and a pole position (λp = 78.4° φp = 283.0° dp = 2.2° dm = 2.8°) for NW Nelson that is indistinguishable from the contemporaneous published pole for the Australian Plate. We infer that this portion of NW Nelson has undergone negligible rotation with respect to the main part of the Australian Plate over the past 17.5 Myr.
Key words: Palaeomagnetism, magnetostratigraphy, Miocene, cryptochron, palaeomagnetic pole position.