Annual Conference of the Geoscience Society of New Zealand Field Trip 1 Sunday 25th–Tuesday 27th November 2018 Subduction to subduction: 100 million years on the eastern margin of Zealandia Image: NASA, International Space Station, image iss042e178671_lrg Leaders: James S. Crampton1, 2, Ben Hines1 and Tim Little2 1GNS Science, Lower Hutt (
[email protected]); 2Victoria University of Wellington 1 Bibliographic reference: Crampton JS, Hines B, Little TA 2018. Subduction to subduction: 100 million years on the eastern margin of Zealandia. In: Sagar MW, Massiot C, Hopkins JL eds. Field Trip Guides: Geosciences 2018, Napier, New Zealand. Geoscience Society of New Zealand Miscellaneous Publication 151B, 48 p. Geoscience Society of New Zealand Miscellaneous Publication 151B ISBN: 978-0-473-45948-2 ISSN (online): 2230-4495 The image on the cover shows an oblique view of central New Zealand outlined in sunglint, viewed from the east and as seen from the International Space Station on January 24th, 2014. The view spans approximately 450 km south to north (left to right). The eastern margin of the North Island, closest to the viewer, was the site of prolonged, Permian to Cretaceous accretion above a subduction zone along the margin of Gondwana. Following opening of the Tasman Sea at ~83 Ma and the separation of Zealandia from Gondwana, the area developed as a passive margin until the propagation of the modern Pacific–Australia plate boundary through Zealandia, by Oligocene times. Since then, eastern North Island has been uplifted by accretion along the modern, active, Hikurangi subduction zone. 2 CONTENTS 1. IMPORTANT HEALTH AND SAFETY INFORMATION …………………………………………………………….