A new calibration point for the late Miocene section of the geomagnetic polarity time scale - Ar-40/Ar-39 dating of lava flows from Akaroa Volcano, New Zealand

Mathematics – Logic

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Chronology, Geomagnetism, Lava, Magnetic Field Inversions, Argon, Basalt, Data Processing, Mass Spectrometers, Radioactive Age Determination

Scientific paper

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 an Ar-40/Ar-39 incremental heating study of two geomagnetic field reversals trapped in lavas on Akaroa Volcano, New Zealand, which demonstrates that the K-Ar derived ages for field reversals at 10-9 Ma are too young by about 7 percent. 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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