Testing the accuracy of the geomagnetic polarity time-scale (GPTS) at 2-5 Ma, utilizing 40Ar/39Ar incremental heating data on whole-rock basalts

Details Testing the accuracy of the geomagnetic polarity time-scale (GPTS) at 2-5 Ma, utilizing 40Ar/39Ar incremental heating data on whole-rock basalts Testing the accuracy of the geomagnetic polarity time-scale (GPTS) at 2-5 Ma, utilizing 40Ar/39Ar incremental heating data on whole-rock basalts

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.118..135b&link_type=abstract

Earth and Planetary Science Letters, Volume 118, Issue 1-4, p. 135-144.

Mathematics

Logic

24

Scientific paper

Recent 40Ar/39Ar dating and astrochronologic calculations indicate that the K-Ar derived GPTS underestimates the ages of geomagnetic field reversals in the interval ~ 2-0 Ma. We report tests to check the accuracy of K-Ar data utilized to date the Reunion Event (~ 2.1 Ma) and part of the early Pliocene portion (~ 4.6 Ma) of the GPTS. 40Ar/39Ar incremental heating studies on whole-rock basalts from the island of Reunion yield an age of 2.14 +/- 0.03 Ma for the Reunion Event, somewhat older than the earlier K-Ar value of 2.07 +/- 0.02 Ma on the same set of lava flows. Study of a single specimen from the Newer Volcanics, Australia, indicates that the earlier K-Ar date was accurate; but the new 40Ar/39Ar results yield a plateau age (4.56 Ma) with a standard error of ~ 0.6%, as compared to the K-Ar value ~ 3%. The improved precision and accuracy resulting from such 40Ar/39Ar incremental heating studies will play a key role in calibrating more precisely the GPTS for the interval 10-0 Ma.

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