Potassium-Argon Age Determinations of the Kirkpatrick Basalt, Mesa Range
- Edmund Stump
Published Online: 16 MAR 2013
Copyright 1986 by the American Geophysical Union.
Geological Investigations in Northern Victoria Land
How to Cite
Elliot, D. H. and Foland, K. A. (1986) Potassium-Argon Age Determinations of the Kirkpatrick Basalt, Mesa Range, in Geological Investigations in Northern Victoria Land (ed E. Stump), American Geophysical Union, Washington, D. C.. doi: 10.1002/9781118664957.ch13
- Published Online: 16 MAR 2013
- Published Print: 1 JAN 1986
Print ISBN: 9780875901978
Online ISBN: 9781118664957
- Geology—Antarctic regions—Victoria Land
New K-Ar analyses of whole-rock samples of lavas of the Kirkpatrick Basalt from the Mesa Range, north Victoria Land, give ages which range from 113 to 178 m.y. An age of 178 m.y. for the uppermost flow gives a minimum age for the lava pile and is consistent with previous estimates of the time of eruption of the lavas throughout the Transantarctic Mountains. The uppermost flow is of the high-Ti type in contrast with lower flows; thus this type of tholeiite in the Mesa Range is not appreciably younger than other Kirkpatrick Basalts. Different ages are obtained not only for rocks of the same flow but also for various size fractions of the same sample. Younger ages appear to be the result of variable 40Ar loss from poorly retentive phases, most likely in the mesostasis of the lavas. The actual timing and cause of 40Ar loss is uncertain.