Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....11180q&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #11180
Astronomy and Astrophysics
Astronomy
Scientific paper
Paleomagnetic investigations conducted on lava sequences from La Palma (Canary Islands) yielded several independent records of the Matuyama-Brunhes transition (MBT). Seven K-Ar ages of flows sampled across the MBT suggest duration between 0 and 11 kyr, and provide a weighted mean age of 786+/-3 ka (analytical uncertainty only) for the transition. When the 1% uncertainty (1 sigma) on the calibration standard used in the present study is considered, our age for the transition recorded at La Palma becomes 786+/-8 ka. This value appears older than the previously admitted age of 779+/-2 ka (Singer and Pringle, 1996) derived from volcanic sequences. We have recalculated these 40Ar/39Ar determinations using recent revisited ages for 40Ar/39Ar standards (Renne et al., 1998) and obtained a significantly older age of 790+/-2 ka. With a standard uncertainty of 1%, this age becomes 790+/-8 ka. The global dataset of 23 K-Ar and revised 40Ar/39Ar determinations yields an age of 789+/-2 ka (analytical error only), or 789+/-8 ka (total error) for the MBT. Within this 8 kyr uncertainty, which could be considered as a minimum estimate, this age remains compatible with recent determinations made by the astronomical time scale. However, this study emphasizes the importance of considering all sources of error before a reliable absolute dating by K-Ar and/or 40Ar/39Ar can be proposed for calibration of the GPTS.
Carlut Julie
Gillot Pierre-Yves
Pierre Valet Jean
Quidelleur Xavier
Soler Vicente
No associations
LandOfFree
The age and duration of the Matuyama-Brunhes transition from new K-Ar data from La Palma (Canary Islands) and revisited Ar/Ar ages does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The age and duration of the Matuyama-Brunhes transition from new K-Ar data from La Palma (Canary Islands) and revisited Ar/Ar ages, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The age and duration of the Matuyama-Brunhes transition from new K-Ar data from La Palma (Canary Islands) and revisited Ar/Ar ages will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-844970