Potassium-Argon Age Determinations of the Kirkpatrick Basalt, Mesa Range

  1. Edmund Stump
  1. D. H. Elliot1 and
  2. K. A. Foland2

Published Online: 16 MAR 2013

DOI: 10.1002/9781118664957.ch13

Geological Investigations in Northern Victoria Land

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

Author Information

  1. 1

    Institute of Polar Studies and Department of Geology and Mineralogy, the Ohio State University, Columbus, Ohio 43210

  2. 2

    Department of Geology and Mineralogy, the Ohio State University, Columbus, Ohio 43210

Publication History

  1. Published Online: 16 MAR 2013
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780875901978

Online ISBN: 9781118664957

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Keywords:

  • Geology—Antarctic regions—Victoria Land

Summary

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.