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Isotopic and geochemical characteristics of mid- to-late-Miocene continental and oceanic arc volcanic and intrusive rocks, central North Island and offshore, New Zealand

Authors: Brian L. Cousens; Christian Timm; Ashley Abraham; Matthew Trenkler; Michael M. Boame; Euri Papanicolaou; Joey Spencer; +2 Authors

Isotopic and geochemical characteristics of mid- to-late-Miocene continental and oceanic arc volcanic and intrusive rocks, central North Island and offshore, New Zealand

Abstract

Abstract Mid- to late-Miocene continental arc volcanism on the North Island of New Zealand is found in the Coromandel Peninsula, the Kiwitahi volcanic chain and the Taranaki Basin (Kora Volcano) offshore the western margin of the North Island. Coeval oceanic arc volcanism is also found along the offshore Colville Ridge/Kermadec Ridge north of New Zealand. This Pb–Sr–Nd–Hf isotopic study aims to evaluate mantle sources and potential crustal contaminants along these sections of the Miocene arc system. The Colville/Kermadec Ridge and Kora lavas have the lowest Sr (0.7029–0.7045) and highest Nd (0.51305–0.51292) ratios; the Coromandel and Kiwitahi lavas overlap (Sr = 0.704–0.706; Nd = 0.51268–0.51296). The Colville/Kermadec Ridge, Kora, and Coromandel/Kiwitahi rocks form three distinct arrays on Pb–Pb plots, all above the Northern Hemisphere Reference Line, but none trend towards local Mesozoic basement greywackes. Isotopic and trace element ratio variations suggest that subducted sediments are a component in Coromandel/Kiwitahi mafic lava sources. The younger, southern Kiwitahi lavas have a more depleted mantle source than that for the older, northern Kiwitahi chain. Evolved lavas commonly have interacted with Waipapa basement rocks. Kora rocks have compositions similar to those of back-arc lavas and have been emplaced as sills in a rift environment above a distinct subduction-modified mantle.

Country
Germany
Keywords

Geology, Ocean Engineering, Water Science and Technology

Banfield, J.F. and Eggleton, R.A. 1989. Apatite replacement and rare earth mobilization, fractionation, and fixation during weathering. Clays and Clay Minerals, 37, 113-127, https://doi.org/10.1346/CCMN.1989.0370202.

Black, P., Briggs, R.M. et al. 1992. K-Ar age data and geochemistry of the Kiwitahi Volcanics, western Hauraki Rift, North Island, New Zealand. New Zealand Journal of Geology and Geophysics, 35, 403-413.

Booden, M.A., Smith, I.E.M., Mauk, J.L. and Black, P.M. 2010. Evolving volcanism at the tip of a propagating arc: The earliest high-Mg andesites in northern New Zealand. Journal of Volcanology and Geothermal Research, 195, 83-96.

Emon, Q. 2020. Causes of rare earth element mobility in volcanic rocks: An example from the Kiwitahi Volcanic Chain, North Island, New Zealand. B.Sc. thesis, Carleton University.

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    0
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    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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NSERC
Project
  • Funder: Natural Sciences and Engineering Research Council of Canada (NSERC)
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