Magmatism during Gondwana breakup: new geochronological data from Westland, New Zealand

Quinten van der Meer; J.M. Scott; Tod Earle Waight; M. Sudo; A. Schersten; A.F. Cooper; T.L. Spell

doi:10.1080/00288306.2013.826699

Magmatism during Gondwana breakup: new geochronological data from Westland, New Zealand

Quinten van der Meer, J.M. Scott, Tod Earle Waight, M. Sudo, A. Schersten, A.F. Cooper, T.L. Spell

Geology

26 Citations (Scopus)

Abstract

Newly determined Late Cretaceous ⁴⁰Ar/³⁹Ar 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.

Original language	English
Journal	New Zealand Journal of Geology and Geophysics
Volume	56
Issue number	4
Pages (from-to)	229-242
Number of pages	14
ISSN	0028-8306
DOIs	https://doi.org/10.1080/00288306.2013.826699
Publication status	Published - 1 Dec 2013

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title = "Magmatism during Gondwana breakup: new geochronological data from Westland, New Zealand",

abstract = "Newly determined Late Cretaceous 40Ar/39Ar 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.",

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T1 - Magmatism during Gondwana breakup

T2 - new geochronological data from Westland, New Zealand

AU - van der Meer, Quinten

AU - Scott, J.M.

AU - Waight, Tod Earle

AU - Sudo, M.

AU - Schersten, A.

AU - Cooper, A.F.

AU - Spell, T.L.

PY - 2013/12/1

Y1 - 2013/12/1

N2 - Newly determined Late Cretaceous 40Ar/39Ar 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.

AB - Newly determined Late Cretaceous 40Ar/39Ar 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.

U2 - 10.1080/00288306.2013.826699

DO - 10.1080/00288306.2013.826699

M3 - Journal article

SN - 0028-8306

VL - 56

SP - 229

EP - 242

JO - New Zealand Journal of Geology and Geophysics

JF - New Zealand Journal of Geology and Geophysics

IS - 4

ER -

Magmatism during Gondwana breakup: new geochronological data from Westland, New Zealand

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