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Baksi et al. 1993

Baksi, A.K., Hoffman, K.A. and Farrar, E. (1993). A new calibration point for the Late Miocene section of the geomagnetic polarity time scale: ⁴⁰Ar/³⁹Ar dating of lava flows from Akaroa Volcano, New Zealand. Geophysical Research Letters 20: doi: 10.1029/93GL00332. issn: 0094-8276.

Recent dating of geomagnetic field reversals over the past 2 Ma, by both the radiometric and astrochronologic techniques, indicates that the K-Ar derived ages for these reversals are too young. We report herein on 40Ar/39Ar incremental heating study of two geomagnetic field reversals trapped in lavas on Akaroa Volcano, New Zealand, that demonstrate that the K-Ar derived ages for field reversals at 10--9 Ma are too young by about 7%. The new age for the termination of chron 5, a critical tie point on the geomagnetic polarity time-scale for late Miocene time, is 9.67¿0.11 Ma. ¿ American Geophysical Union 1993

BACKGROUND DATA FILES

	Abstract

Keywords
Geomagnetism and Paleomagnetism, Reversals (process, time scale, magnetostratigraphy), Information Related to Geographic Region, Australia, Information Related to Geologic Time, Cenozoic

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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