Rb sr method of dating
Therefore, 20% of Sr in biomass is derived from the bedrock and 80% from atmospherically-transported dust (Graustein, 1989).
Estimates for the release of Ca by weathering can be estimated using strontium isotopes (Aberg et al., 1989). (1993) report that Sr can be used to separate the total cations exported from the catchment into the components derived from mineral weathering reactions and cation-exchange reactions in the soil.
Source of text: This review was assembled by Carol Kendall and Dan Snyder, primarily from Kendall et al. Please contact Carol Kendall ([email protected]) for questions and comments regarding this page.
Dating, in geology, determining a chronology or calendar of events in the history of Earth, using to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments.
Instead, the waters moving along specific flowpaths slowly react with the rocks and gradually approach chemical equilibrium over long time-periods.For waters developed in multi-mineralic rocks or soils, Sr in any water parcel usually represents a mixture of Sr from several sources, and thus the exact contributions from individual minerals are difficult to determine with the Sr isotopic data alone.However, when considered in conjunction with water chemistry, the Sr isotopes provide a powerful tool for distinguishing among solute sources.However, because Rb substitutes for K in minerals and these minerals have different K/Ca ratios, the minerals will have had different Rb/Sr ratios.During fractional crystallization, Sr tends to be come concentrated in plagioclase, leaving Rb in the liquid phase.