Tom aka "proudest member of the I.M.C.A." wrote: > Is there any one on the list who can > tell me how old G.B. meteorites are?
Hello Tom and List, KRING D.A. et al. (2001) Gold Basin Meteorite Strewn Field, Mojave Desert, Northwestern Arizona: Relict of a Small Late Pleistocene Impact Event (MAPS 36-8, 2001, pp. 1057-1066): "Cosmogenic nuclide studies indicate the meteorite has a terrestrial age of 15,000 � 600 years, corresponding to the Late Pinedale portion of the Wisconsin Glaciation." > And how they came up with the age? Dr Kring et al. have studied the 14C composition of several samples and found a distinct range of 14C contents. They then used the mean ratio of 14C/10Be (10Be is used as a shielding correction for 14C) to derive the terrestrial age with the help of mathematical formulae (see H.Y. McSween Jr. Meteorites and Their Parent Planets, pp. 40-44 and pp. 248-250) that compare initial values of 14C and 10Be versus current amounts. The dacay constants for the two radionuclides play an important role here. Best regards, Bernd ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
