New Zealand Journal of Geology & Geophysics abstracts
LA-ICP-MS U-Pb zircon ages from Mesozoic plutonic rocks in eastern
Fiordland, New Zealand
J. M. Scott
J. M. Palin
Geology Department
University of Otago
PO Box 56
Dunedin 9054, New Zealand
scoja310@student.otago.ac.nz
michael.palin@otago.ac.nz
Abstract Laser ablation inductively coupled plasma
mass-spectrometry (LA-ICP-MS) 206Pb-238U zircon
dates are reported for eight plutonic rocks from eastern Fiordland. The
oldest samples are Jurassic (granodiorite, 160.6 ± 1.4 Ma;
quartz diorite, 153.0 ± 0.8 Ma; granodiorite, 152.5 ± 0.7
Ma; errors at 2 s) and collectively belong to the Hunter Intrusives
member of the Darran/Median Suite. The LA-ICP-MS age for the younger
granodiorite agrees with a concordant multigrain TIMS U-Pb zircon age
previously obtained from the same sample. Xenoliths of Hunter
Intrusives occur within the Early Cretaceous (127.9 ± 1.1 Ma)
granitic Fowler Pluton, also of the Darran/Median Suite. There was a
short lull in plutonism until emplacement of leucogranite dikes (123.5
± 1.2 Ma) and granitoids of the Refrigerator Orthogneiss (120.7
± 1.1 Ma), Puteketeke Pluton (120.8 ± 0.9 Ma), and West
Arm Leucogranite (116.3 ± 1.2 Ma), all of which are members of
the Separation Point Suite.
Keywords LA-ICP-MS; zircon; U-Pb;
Fiordland; Darran Suite;
Median Suite; Separation Point Suite
G07031; Online publication date 29 April 2008; Received 12 December
2007; accepted 31 March 2008
New Zealand Journal of Geology & Geophysics, 2008, Vol. 51:
105–113
0028–8306/08/5102–0105 © The Royal Society of New Zealand 2008
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