New Zealand Journal of Geology and Geophysics abstracts

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Triassic radiolarians from the ocean-floor sequence of the Waipapa Terrane at Arrow Rocks, Northland, New Zealand

Atsushi Takemura¹
Yoshiaki Aita²
Rie S. Hori³
Yasushi Higuchi³
K. Bernhard Spörli⁴
Hamish J. Campbell⁵
Kazuto Kodama⁶
Toyosaburo Sakai²

¹Geoscience Institute
Hyogo University of Teacher Education
Yashiro-cho, Kato-gun
Hyogo 673-1494, Japan,
email: takemura@sci.hyogo-u.ac.jp

²Department of Geology
Faculty of Agriculture
Utsunomiya University
Utsunomiya 321-8505, Japan

³Department of Earth Sciences
Faculty of Science
Ehime University
Matsuyama 790-8577, Japan

⁴Department of Geology
University of Auckland
Private Bag 92 019
Auckland, New Zealand

⁵Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand

⁶Department of Geology
Faculty of Science
Kochi University
Kochi 780, Japan

Abstract   Triassic radiolarians are reported from two horizons in Waipapa Terrane at Arrow Rocks, Whangaroa area, Northland. This relatively undisturbed succession represents an ocean-floor sequence, consisting (in ascending order) of basalt with limestone layers, bedded chert, black shale, and red, maroon and green siliceous mudstone. The age of the lower part of the section is Middle-Late Permian. The radiolarian assemblages reported here indicate Early or Middle Triassic and Middle Triassic (Anisian) ages for maroon siliceous mudstones in the upper part of the section. Between strata of known Permian and Triassic age there is a thin potential Permian/Triassic boundary interval consisting of alternating black shale and grey chert. Radiolarian paleogeography indicates that the Arrow Rocks sequence experienced long distance plate tectonic displacement from a position of relatively low latitude in the Middle Permian and to a high latitude in mid-Triassic time.

Keywords   New Zealand; Waipapa Terrane; Northland; Arrow Rocks; Radiolaria; Permian; Triassic; Permian/Triassic boundary; chert; siliceous mudstone; ocean-floor sequence

G00071 Received 21 December 2000; accepted 29 April 2002; published 27 September 2002
New Zealand Journal of Geology & Geophysics, 2002, Vol. 45: 289-296
0028-8306/02/4503-0289 $7.00/0 © The Royal Society of New Zealand 2002

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