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Age relationships and tectonic implications of late Cenozoic basaltic volcanism in Northland, New Zealand

Journal Article:

Abstract

An episode of late Miocene-Recent essentially basaltic volcanism is the latest in a sequence of magmatic events recognised in the tectonically complex geological development of the Northland Peninsula. New K-Ar dates together with an extensive collection of new major and trace element chemical analyses prompt a reassessment of the significance of these late Cenozoic basalts. The main time/space groupings recognised are Tertiary volcanics in the Kaikohe-Bay of Islands, Puhipuhi, Ti Point, and Stony Batter areas and Quaternary basalts in the Kaikohe-Bay of Islands and Whangarei areas and at Tara. Basalts in the Kaikohe-Bay of Islands area are transitional to alkalic in character, while those in the south are transitional to tholeiitic, with the Ti Point and Stony Batter rocks being geochemically distinct. A consistent model for these observations is that the magmas originate from different levels of a layered mantle source in which the upper part carries a geochemical signature inherited from an earlier subduction event. (author). 27 refs., 7 figs., 1 tab.
Authors:
Smith, I E.M.; [1]  Okada, T; [2]  Itaya, T; [2]  Black, P M [1] 
  1. Department of Geology, Auckland University, Auckland (New Zealand)
  2. Okayama University of Science, Hiruzen Research Institute, Okayama (Japan)
Publication Date:
Jul 01, 1993
Product Type:
Journal Article
Resource Relation:
Journal Name: New Zealand Journal of Geology and Geophysics; Journal Volume: 36; Journal Issue: 3; Other Information: PBD: 1993
Subject:
58 GEOSCIENCES; AGE ESTIMATION; ARGON 40; CENOZOIC ERA; GEOCHEMISTRY; NEW ZEALAND; POTASSIUM; TECTONICS; VOLCANISM
OSTI ID:
20498263
Country of Origin:
New Zealand
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0028-8306; TRN: NZ0400063069622
Submitting Site:
INIS
Size:
page(s) 385-393
Announcement Date:

Journal Article:

Citation Formats

Smith, I E.M., Okada, T, Itaya, T, and Black, P M. Age relationships and tectonic implications of late Cenozoic basaltic volcanism in Northland, New Zealand. New Zealand: N. p., 1993. Web.
Smith, I E.M., Okada, T, Itaya, T, & Black, P M. Age relationships and tectonic implications of late Cenozoic basaltic volcanism in Northland, New Zealand. New Zealand.
Smith, I E.M., Okada, T, Itaya, T, and Black, P M. 1993. "Age relationships and tectonic implications of late Cenozoic basaltic volcanism in Northland, New Zealand." New Zealand.
@misc{etde_20498263,
title = {Age relationships and tectonic implications of late Cenozoic basaltic volcanism in Northland, New Zealand}
author = {Smith, I E.M., Okada, T, Itaya, T, and Black, P M}
abstractNote = {An episode of late Miocene-Recent essentially basaltic volcanism is the latest in a sequence of magmatic events recognised in the tectonically complex geological development of the Northland Peninsula. New K-Ar dates together with an extensive collection of new major and trace element chemical analyses prompt a reassessment of the significance of these late Cenozoic basalts. The main time/space groupings recognised are Tertiary volcanics in the Kaikohe-Bay of Islands, Puhipuhi, Ti Point, and Stony Batter areas and Quaternary basalts in the Kaikohe-Bay of Islands and Whangarei areas and at Tara. Basalts in the Kaikohe-Bay of Islands area are transitional to alkalic in character, while those in the south are transitional to tholeiitic, with the Ti Point and Stony Batter rocks being geochemically distinct. A consistent model for these observations is that the magmas originate from different levels of a layered mantle source in which the upper part carries a geochemical signature inherited from an earlier subduction event. (author). 27 refs., 7 figs., 1 tab.}
journal = {New Zealand Journal of Geology and Geophysics}
issue = {3}
volume = {36}
journal type = {AC}
place = {New Zealand}
year = {1993}
month = {Jul}
}