A long-held dream of seismologists -- to be able to predict earthquakes -- may be a bit closer to coming true, thanks to the work of Marek Zreda at The University of Arizona in Tucson. A new method of dating past earthquakes can provide information that may help predict future quakes on certain types of faults, according to a paper published today Nov. Noller of Vanderbilt University. Zreda, a cosmogenic isotope geochemist and assistant professor in the department of hydrology and water resources, and Noller, a seismologist, measured trace amounts of the chlorine isotope chlorine 36Cl on surfaces of bedrock exposed by faulting action at a site in Montana in order to date earthquake events there. The 36Cl results from chemical changes in surface elements that react with neutrons and muons produced by cosmic rays that enter the Earth's atmosphere. These cosmic rays, produced in deep space and deflected into Earth's atmosphere by its magnetic field, bombard our planet at a rate that is known and predictable, Zreda says, for any given site's latitude and altitude.
The accumulation of cosmogenic chlorine-36 in rocks: a method for surface exposure dating
Be10 Cosmogenic Dating - Cosmogenic nuclide dating
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The accumulation of cosmogenic chlorine-36 in rocks: a method for surface exposure dating.
No it is not volcanic ash. Is it a dusty bit of sarsen?? It might be calcareous. Brian The point is that all these dates are well after the , year old glaciation that your suggesting - if you are correct the dates would be K - K not 4. You have the lack of scatter plus Chlorine 36 dates against your hypothesis - what evidence do you have for your hypothesis that is more substantial than the evidence against?
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