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The GSNZ President, Dr Nick Mortimer (GNS Science, Dunedin),
will touring the country from March through to June, 2008.An itinerary is given below.
A BLUFFER'S GUIDE TO CENOZOIC VOLCANIC ARCS AND BASINS OF THE SW PACIFIC
Abstract
The northern half of the continent of Zealandia is bordered by an array of volcanic arcs and deep basins that have formed over the last 85 million years. The best studied of these are the modern Taupo-Kermadec-Tonga volcanic arc and the associated active backarc Havre Trough and Lau Basin. This talk will summarise the present state of knowledge of the lesser-known ridges and basins to the west, especially the Norfolk and South Fiji Basins, the Three Kings and Colville Ridges and the Northland Plateau.
In the last 10 years, data from two ONSIDE (Offshore Northland SeismIc and Dredging Expedition) cruises has led to considerable progress in our understanding of the geology of these major bathymetric features. The interval 17-25 million years ago appears to have been a time of considerable tectonic change north of New Zealand. There is reasonable consensus on the tectonic development of the region north of New Zealand after 17 Ma and major (but ultimately very testable) differences on 85-25 Ma tectonic models.
A knowledge of the evolution of the whole Cretaceous-Recent SW Pacific arc-backarc system can help us understand the geotectonic processes that control the longevity of arcs and formation of backarc basins around the world.
At the beginning of the talk, Nick will talk a bit about his background, and say a few words about the Geological Society.
Itinerary
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BRANCH
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DATE
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CONTACT
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Auckland
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Tue 18 Mar
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Jan Lindsay (l.lindsay_at_auckland.ac.nz)
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Hamilton
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Wed 19 Mar
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Rochelle Hansen (rjhansen_at_waikato.ac.nz)
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Dunedin
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Wed 26 Mar
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Andrew Gorman (andrew.gorman_at_otago.ac.nz)
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Taranaki
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Mon 31 Mar
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Susan Burgess (susan_at_netmail.co.nz)
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Taupo
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Tue 1 Apr
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Paul White (p.white_at_gns.cri.nz)
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Palmerston North
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Wed 2 Apr
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Julie Palmer (J.A.Palmer_at_massey.ac.nz)
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Wellington
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Thu 3 Apr
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Alan Orpin (a.orpin_at_niwa.co.nz)
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Masterton
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Thu 12 Jun
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Val Lear (blueiris_at_slingshot.co.nz)
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Christchurch
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Tue 17 Jun
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Phil Tonkin (horowai_at_paradise.net.nz)
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Nelson
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Wed 18 Jun
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Peter Ballance (ballance_at_clear.net.nz)
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President's Lecture 2008