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Precise two chronometer dating of Pleistocene travertine: The. 230 must have remained almost uniform in all limestone over a period of at least 7000 yr, i.e. 4–5 half-lives of 226Ra. 0:444 В 10А3=y (or T1=2 ¼ 1560yr), indicating the con-.
Reviews in Mineralogy and Geochemistry . Systems are simply ordered by closure temperature on the Y-axis. With the .. To the extent that the parent abundance within a rock is not uniform, e.g., because distinct crystals are present, spatial