Ar-40/Ar-39 dating of the Brunhes-Matuyama geomagnetic field reversal

Details Ar-40/Ar-39 dating of the Brunhes-Matuyama geomagnetic field reversal Ar-40/Ar-39 dating of the Brunhes-Matuyama geomagnetic field reversal

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...256..356b&link_type=abstract

Science (ISSN 0036-8075), vol. 256, no. 5055, April 17, 1992, p. 356, 357. Research supported by NSF and NSERC.

Astronomy and Astrophysics

Astronomy

31

Geomagnetism, Magnetic Field Inversions, Paleomagnetism, Radioactive Age Determination, Argon Isotopes, Lava, Magnetization

Scientific paper

Magnetostratigraphic studies are used in conjunction with the geomagnetic polarity time scale (GPTS) to date events in the range 0 to 5 million years ago, particularly the potassium-argon age of the most recent (Brunhes-Matuyama) geomagnetic field reversal. Results from Ar-40/Ar-39 incremental heating studies on a series of lavas from Maui that straddle the Brunhes-Matuyama reversal give an age of 783 +/- 11 ka, in agreement with the astronomically derived value. The astronomically based technique appears to be a viable tool for dating young sedimentary sequences.

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