TY - RPRT TI - Improved calibration procedures and new standards for U - Pb and Th - Pb dating of Phanerozoic xenotime by ion microprobe AU - I.R. Fletcher AU - N.J. McNaughton AU - J.A. Aleinikoff AU - B. Rasmussen AU - S.L. Kamo PY - 2004 DO - 10.1016/j.chemgeo.2004.06.015 UR - https://pubs.usgs.gov/publication/70026592 ID - 70026592 ER -