Synchronizing Rock Clocks of Earth History

Details Synchronizing Rock Clocks of Earth History Synchronizing Rock Clocks of Earth History

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sci...320..500k&link_type=abstract

Science, Volume 320, Issue 5875, pp. 500- (2008).

Mathematics

Logic

73

Scientific paper

Calibration of the geological time scale is achieved by independent radioisotopic and astronomical dating, but these techniques yield discrepancies of ~1.0% or more, limiting our ability to reconstruct Earth history. To overcome this fundamental setback, we compared astronomical and 40Ar/39Ar ages of tephras in marine deposits in Morocco to calibrate the age of Fish Canyon sanidine, the most widely used standard in 40Ar/39Ar geochronology. This calibration results in a more precise older age of 28.201 ± 0.046 million years ago (Ma) and reduces the 40Ar/39Ar method’s absolute uncertainty from ~2.5 to 0.25%. In addition, this calibration provides tight constraints for the astronomical tuning of pre-Neogene successions, resulting in a mutually consistent age of ~65.95 Ma for the Cretaceous/Tertiary boundary.

Affiliated with

Also associated with

No associations

Rating

Synchronizing Rock Clocks of Earth History 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 Synchronizing Rock Clocks of Earth History, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronizing Rock Clocks of Earth History will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1698383