Colville III '16 (TAN1611) cruise report Wellington-Auckland, September 26-October 16, 2016

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Timm, C.; Caratori Tontini, F.; Kane, T.; Woelz, S.; Stewart, T.J.; Barrett, R.; Whattam, J. 2017 Colville III '16 (TAN1611) cruise report Wellington-Auckland, September 26-October 16, 2016. Lower Hutt, N.Z.: GNS Science. GNS Science report 2017/06 25 p.; doi: 10.21420/G2B59B


Abstract: This research voyage successfully acquired geophysical data and rock samples from the northern part of the Colville Ridge, within New Zealand’s Exclusive Economic Zone (EEZ). The main output of this voyage is providing data and fundamental base maps for future regional prospectivity surveys, tectonic plate reconstructions, and general understanding of the architecture of the Kermadec backarc. The Colville III ‘16 voyage builds on two previous voyages to the southern and mid Colville ridge in 2013 and 2015 respectively and completes a comprehensive and dataset that extends unbroken for over 1000 km along the Colville Ridge. In 2013 and 2015 voyages acquired a suite of geophysical (gravity, magnetic, bathymetry and backscatter) data and rock samples (de Ronde et al 2016a & de Ronde et al 2016b). The 21 day Colville III ’16 cruise was successful in acquiring gravity and magnetic measurements, along with bathymetry and backscatter data, during 18 days of surveying, over an area of ~21,815 km2. Dredge sites were selected from features and anomalies shown in the newly acquired geophysical data, 47 rock samples were obtained from 11 successful dredge deployments. Combined with Colville I and Colville II voyage data, the data collected from Colville III ’16 are crucial for our ability to understand the evolution of New Zealand’s on and offshore territory. These data are required to identify prospective sites to carry out more focused, follow-up surveys by AUVs, ROVs, and possibly manned submersibles along the Colville Ridge. The results from this survey will be published as maps and papers in international journals and will become publicly accessible online at GNS. (auth)