Results 71 to 72 of about 5,062,375 (72)

U-Pb SHRIMP dating of uraniferous opals

, 2005
U-Pb and U-series analyses of four U-rich opal samples using sensitive high-resolution ion microprobe (SHRIMP) demonstrate the potential of this technique for the dating of opals with ages ranging from several tens of thousand years to millions of years.
Alexander Nemchin (23302264), L. Neymark (23550148), S. Simons (7652579)   +2 more
core  

Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples

, 2017
© 2017 Elsevier Ltd Pb-Pb isochron ages of ca. 3.92 Ga for three K-feldspar-rich clasts from Apollo 14 breccias 14303 and 14083 were determined using Secondary Ion Mass Spectrometry (SIMS).
Alexander Nemchin (23287132), J. Bellucci (23302432), Nicholas Eric Timms (23302267), M. Kilburn (23304802), H. Jeon (7929593), M. Whitehouse (23302435), J. Snape (23302438)   +6 more
core