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Through time crustal rocks will have more radiogenic 87Sr relative to mantle rocks.

The production of radiogenic Sr can be expressed with respect to a reference isotope is the y-intercept ( which corresponds to Basalitc Achondrite Best Initial (or BABI) value for achondrite meteorites which gives an estimate of the initial Sr isotopic composition of the earth when it formed out of the solar nebula) and the slope of this line is proportional to the amount of time the rock has remained in a closed system with respect to Rb and Sr.

Furthermore, even this “gold standard” has unresolved uncertainties due to the U decay constants being imprecisely known, and to measured variations of the U ratio in terrestrial rocks and minerals and in meteorites.

Mafic rocks and associated suites of more differentiated rocks can be dated by whole-rock or internal mineral isochrons.These Sm-Nd dates are less susceptible to metamorphic alteration than Rb-Sr dates.The concentration of Nd in natural waters is extremely low because the natural abundance of Nd is very small, and Nd is non-hydrophilic in low temperature environments.And because of their similar geochemical behavior, Sm and Nd are not fractionated from one another as severely as Rb and Sr.This fact, combined with the very long half-life of Please contact Carol Kendall ([email protected]) for questions and comments regarding this page.

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