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Magmatism during Gondwana break-up: new geochronological data from Westland, New Zealand

Van der Meer, Q. H. A. ; Scott, J. M. ; Waight, T. E. ; Sudo, M. ; Scherstén, Anders LU ; Cooper, A. F. and Spell, T. L. (2013) In New Zealand Journal of Geology and Geophysics 56(4). p.229-242
Abstract
Newly determined Late Cretaceous Ar-40/Ar-39 ages on megacrystic kaersutite from four lamprophyre dikes, and a U-Pb zircon age on a trachyte, from central and north Westland (New Zealand) are presented. These ages suggest that the intrusion of mafic dikes (88-86 and 69 Ma) was not necessarily restricted to the previously established narrow age range of 80-92 Ma. The younger lamprophyre and trachyte dikes (c. 68-70 Ma) imply that tensional stresses in the Western Province were either renewed at this time, or that extension and related magmatism continued during opening of the Tasman Sea. Extension-related magmatism in the region not only preceded Tasman seafloor spreading initiation (starting at c. 83 Ma, lasting to c. 53 Ma), but may have... (More)
Newly determined Late Cretaceous Ar-40/Ar-39 ages on megacrystic kaersutite from four lamprophyre dikes, and a U-Pb zircon age on a trachyte, from central and north Westland (New Zealand) are presented. These ages suggest that the intrusion of mafic dikes (88-86 and 69 Ma) was not necessarily restricted to the previously established narrow age range of 80-92 Ma. The younger lamprophyre and trachyte dikes (c. 68-70 Ma) imply that tensional stresses in the Western Province were either renewed at this time, or that extension and related magmatism continued during opening of the Tasman Sea. Extension-related magmatism in the region not only preceded Tasman seafloor spreading initiation (starting at c. 83 Ma, lasting to c. 53 Ma), but may have sporadically continued for up to 15 Ma after continental break-up. (Less)
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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Gondwana break-up, geochronology, lamprophyre, central Westland, Fraser, Complex
in
New Zealand Journal of Geology and Geophysics
volume
56
issue
4
pages
229 - 242
publisher
Royal Society of New Zealand
external identifiers
  • wos:000326867800005
  • scopus:84888637727
ISSN
0028-8306
DOI
10.1080/00288306.2013.826699
language
English
LU publication?
yes
id
d8b0c1fa-bffc-4c8d-b04a-5ef83c11aeff (old id 4197971)
date added to LUP
2016-04-01 13:15:27
date last changed
2022-01-27 18:13:10
@article{d8b0c1fa-bffc-4c8d-b04a-5ef83c11aeff,
  abstract     = {{Newly determined Late Cretaceous Ar-40/Ar-39 ages on megacrystic kaersutite from four lamprophyre dikes, and a U-Pb zircon age on a trachyte, from central and north Westland (New Zealand) are presented. These ages suggest that the intrusion of mafic dikes (88-86 and 69 Ma) was not necessarily restricted to the previously established narrow age range of 80-92 Ma. The younger lamprophyre and trachyte dikes (c. 68-70 Ma) imply that tensional stresses in the Western Province were either renewed at this time, or that extension and related magmatism continued during opening of the Tasman Sea. Extension-related magmatism in the region not only preceded Tasman seafloor spreading initiation (starting at c. 83 Ma, lasting to c. 53 Ma), but may have sporadically continued for up to 15 Ma after continental break-up.}},
  author       = {{Van der Meer, Q. H. A. and Scott, J. M. and Waight, T. E. and Sudo, M. and Scherstén, Anders and Cooper, A. F. and Spell, T. L.}},
  issn         = {{0028-8306}},
  keywords     = {{Gondwana break-up; geochronology; lamprophyre; central Westland; Fraser; Complex}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{229--242}},
  publisher    = {{Royal Society of New Zealand}},
  series       = {{New Zealand Journal of Geology and Geophysics}},
  title        = {{Magmatism during Gondwana break-up: new geochronological data from Westland, New Zealand}},
  url          = {{http://dx.doi.org/10.1080/00288306.2013.826699}},
  doi          = {{10.1080/00288306.2013.826699}},
  volume       = {{56}},
  year         = {{2013}},
}