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29 March 2024
 
  » arxiv » 1109.4805

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Shorter 146Sm half-life and revised 146Sm-142Nd ages of planetary mantle differentiation
N. Kinoshita ; M. Paul ; Y. Kashiv ; P. Collon ; C.M. Deibel ; B. DiGiovine ; J.P. Greene ; D.J. Henderson ; C.L. Jiang ; S.T. Marley ; T. Nakanishi ; R.C. Pardo ; K.E. Rehm ; D. Robertson ; R. Scott ; C. Schmitt ; X.D. Tang ; R. Vondrasek ; A. Yokoyama ;
Date 22 Sep 2011
AbstractThe extinct short-lived nuclide 146Sm, synthesized in stellar events by the p-process, serves as both an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its alpha-decay daughter 142Nd. Evidence of live 146Sm, quantitatively established for the early Solar System, constrains the time between p-process nucleosynthesis and condensation of the first solid materials. Samarium-146 is used also to date silicate mantle differentiation events in a number of planetary bodies, including Earth. We performed a new measurement of the 146Sm half-life and our result, t = 68pm7 (1sigma) million year (Ma), is significantly shorter than the value currently used for 146Sm-142Nd chronology (103pm5 Ma). We show here that the shorter 146Sm half-life value implies a higher initial Solar System ratio, (146Sm/144Sm)_0 = 0.0094pm0.0005 (2sigma), than the recently derived value 0.0085pm0.0007, or that used in most studies 0.008pm0.001. Planetary differentiation processes dated by 146Sm-142Nd converge to a shorter time span, due to the combined effect of the new 146Sm half-life and (146Sm/144Sm)_0 values. The revised 142Nd age of the recently dated Lunar ferroan anorthosite (FAN) 60025, is in agreement with its 147Sm-143Nd age; their weighted average, 196pm11 (2sigma) Ma after Solar System birth, is consistent with the 208.8pm2.4 Ma Pb-Pb age and with the age derived here (170pm15 Ma) from an isochron of Lunar rocks.
Source arXiv, 1109.4805
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