Crustal and mantle influences and U-Th-Ra disequilibrium in andesitic lavas of Ngauruhoe volcano, New Zealand
Richard C Price, Simon Turner, Craig Cook, Barbara Hobden, Ian EM Smith, John A Gamble, Heather Handley, Roland Maas, Anja Moebis
Chemical Geology | ELSEVIER | Published : 2010
The andesitic volcano Ngauruhoe, which is located within the Tongariro Volcanic Complex at the southern end of the Taupo Volcanic Zone in North Island, New Zealand, has been constructed over the past 5. ka and last erupted in 1975. Nearby Ruapehu volcano has a much longer eruptive history extending back beyond 230. ka. B.P. The magmas erupted at both volcanoes have been predominantly medium-K basaltic andesites and andesites, which evolved through polybaric crystal fractionation and assimilation processes that took place within complex, dispersed magmatic storage systems. Despite their close spatial proximity, the two volcanoes show geochemical contrasts suggesting that in each case both the..View full abstract
Awarded by Marsden Fund
Awarded by Foundation for Research, Science and Technology of New Zealand
Awarded by Australian Research Council
This research builds on earlier U-series work on Ruapehu volcano involving Rhiannon George, Chris Hawkesworth, and Rob Hughes and on Barbara Hobden's PhD work, which was carried out at the University of Canterbury under the supervision of Steve Weaver, Bruce Houghton and David Shelley and with the support of Ian Nairn. It has been funded by the Marsden Fund (contract number UOW106), which is managed by the Royal Society of New Zealand and the Foundation for Research, Science and Technology of New Zealand (contract MAUX0401). Simon Turner was supported by an Australian Research Council Professorial Fellowship DP0988658.The instrumentation used is funded by ARC LIEF and DEST Systemic Infrastructure Grants, Macquarie University and Industry. The manuscript benefited from a thorough and helpful review by Georg Zellmer. We thank Christoph Beier for assisting with the U-Th analyses and Shane. Isabella and Marcel Cronin for their assistance in the field.