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Evidence of the extinct nuclide 146Sm in ‘Juvinas’ achondrite.

The isotopic abundance of 142Nd in the Juvinas meteorite. Possible effects of 39Ar recoil in 40Ar/39Ar dating. Additionally, this technique could sometimes give spurious results if zircons with a complex crystallisation history (ie zoned zircons) were not identified and removed from the sample set. Comments about other messages: Jon F, in message 3, just overwhelmed me. Obviously collecting enough zircon from mafic materials was often very difficult. All hail the mighty SHRIMP (Sensitive High Resolution Ion Microprobe).The first Sm)Nd dating study was performed by Notsu et al. (1973) on the achondrite Juvinas, but with low analytical precision. (1975) obtained much more precise results on minerals from the same meteorite (Fig. Numerous other basaltic achondrites have been dated by Sm–Nd, and with the exception of Stannern (Lugmair and Scheinin, 1975), all yield ages in the range 4550 ) 4600 Myr.

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