Snapshot of the Matuyama-Brunhes reversal process recorded in 40Ar/39Ar-dated lavas from Guadeloupe, West Indies
Article first published online: 1 OCT 2013
©2013. American Geophysical Union. All Rights Reserved.
Geochemistry, Geophysics, Geosystems
Volume 14, Issue 10, pages 4341–4350, October 2013
How to Cite
2013), Snapshot of the Matuyama-Brunhes reversal process recorded in 40Ar/39Ar-dated lavas from Guadeloupe, West Indies, Geochem. Geophys. Geosyst., 14, 4341–4350, doi:10.1002/ggge.20263., , , and (
- Issue published online: 26 NOV 2013
- Article first published online: 1 OCT 2013
- Accepted manuscript online: 31 AUG 2013 12:00AM EST
- Manuscript Revised: 26 AUG 2013
- Manuscript Accepted: 26 AUG 2013
- Manuscript Received: 16 MAY 2013
- geomagnetic reversals;
- Ar/Ar geochronology
 We obtain new 40Ar/39Ar ages for three lavas that record part of the Matuyama-Brunhes geomagnetic field reversal process on Guadeloupe. These lavas record a reversed-transitional-reversed magnetostratigraphy and yield a weighted mean isochron age of 785.2 ± 5.2 ka (2σ analytical uncertainty) relative to an age for the Fish Canyon sanidine standard of 28.201 Ma. This age is of greater accuracy than ages obtained previously by K-Ar dating. These lavas may record directional fluctuations occurring between the Matuyama-Brunhes precursor and the final directional reversal. Such variations have been observed in some globally distributed coupled paleomagnetic and oxygen isotope marine sedimentary records of the Matuyama-Brunhes reversal. Previous paleointensity estimates from these lavas indicate reduced, but fluctuating field strength during this time.