Magmatism during Gondwana break-up: new geochronological data from Westland, New Zealand
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4197971
- author
- Van der Meer, Q. H. A. ; Scott, J. M. ; Waight, T. E. ; Sudo, M. ; Scherstén, Anders LU ; Cooper, A. F. and Spell, T. L.
- organization
- publishing date
- 2013
- 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}}, }