Magmatism during Gondwana breakup: new geochronological data from Westland, New Zealand
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Magmatism during Gondwana breakup : new geochronological data from Westland, New Zealand. / van der Meer, Quinten; Scott, J.M.; Waight, Tod Earle; Sudo, M.; Schersten, A.; Cooper, A.F.; Spell, T.L.
I: New Zealand Journal of Geology and Geophysics, Bind 56, Nr. 4, 2013, s. 229-242.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
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
Y1 - 2013
N2 - Newly determined mid-late Cretaceous 40Ar/39Ar ages on megacrystic kaersutite from lamprophyre dikes in central and north Westland (New Zealand) are presented. These ages (88 Ma, 86 Ma and 68 Ma) indicate that the intrusion of mafic dikes was not necessarily restricted to the previously established narrow age range of 80-92 Ma. The younger (~68-70 Ma) lamprophyre and trachyte dikes imply that tensional stresses in the Western Province were either renewed at this time, or that extension and related magmatism was continuous during opening of the Tasman Sea. Extension-related magmatism in the region did not only precede Tasman Sea initiation (starting at ~83 Ma, lasting to ~53 Ma) but may have sporadically continued for up to 15 Myr after continental breakup.
AB - Newly determined mid-late Cretaceous 40Ar/39Ar ages on megacrystic kaersutite from lamprophyre dikes in central and north Westland (New Zealand) are presented. These ages (88 Ma, 86 Ma and 68 Ma) indicate that the intrusion of mafic dikes was not necessarily restricted to the previously established narrow age range of 80-92 Ma. The younger (~68-70 Ma) lamprophyre and trachyte dikes imply that tensional stresses in the Western Province were either renewed at this time, or that extension and related magmatism was continuous during opening of the Tasman Sea. Extension-related magmatism in the region did not only precede Tasman Sea initiation (starting at ~83 Ma, lasting to ~53 Ma) but may have sporadically continued for up to 15 Myr after continental breakup.
U2 - 10.1080/00288306.2013.826699
DO - 10.1080/00288306.2013.826699
M3 - Journal article
VL - 56
SP - 229
EP - 242
JO - New Zealand Journal of Geology, and Geophysics
JF - New Zealand Journal of Geology, and Geophysics
SN - 0028-8306
IS - 4
ER -
ID: 45455739