Abstract
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.
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