The utility of the rubidium-strontium isotope system results from the fact that Sr with a half life of 48.8 billion years.
In addition, Rb is a highly incompatible element that, during partial melting of the mantle, prefers to join the magmatic melt rather than remain in mantle minerals. The radiogenic daughter, Sr, is produced in this decay process and was produced in rounds of stellar nucleosynthesis predating the creation of the Solar System.
During fractional crystallization, Sr tends to become concentrated in plagioclase, leaving Rb in the liquid phase.
Hence, the Rb/Sr ratio in residual magma may increase over time, resulting in rocks with increasing Rb/Sr ratios with increasing differentiation. Typically, Rb/Sr increases in the order plagioclase, hornblende, K-feldspar, biotite, muscovite.
Therefore, given sufficient time for significant production (ingrowth) of radiogenic For example, consider the case of an igneous rock such as a granite that contains several major Sr-bearing minerals including plagioclase feldspar, K-feldspar, hornblende, biotite, and muscovite.
The energies involved are so large, and the nucleus is so small that physical conditions in the Earth (i.e. The rate of decay or rate of change of the number N of particles is proportional to the number present at any time, i.e.MAC ADDRESS Vendor Lookup ABB INDUSTRIAL SYSTEMS ABMAC ADDRESS Vendor Lookup Olicom MAC ADDRESS Vendor Lookup RAMTEK CORP. MAC ADDRESS Vendor Lookup JAPAN RADIO COMPANYMAC ADDRESS Vendor Lookup PRODIGY SYSTEMS CORPORATIONMAC ADDRESS Vendor Lookup IMC NETWORKS CORP.MAC ADDRESS Vendor Lookup :2A TRW - SEDD/INPMAC ADDRESS Vendor Lookup :2B CRISP AUTOMATION, INCMAC ADDRESS Vendor Lookup :2C AUTOTOTE LIMITEDMAC ADDRESS Vendor Lookup :2D CHROMATICS INCMAC ADDRESS Vendor Lookup :2E SOCIETE EVIRAMAC ADDRESS Vendor Lookup :2F TIMEPLEX INC.This activity was selected for the On the Cutting Edge Reviewed Teaching Collection This activity has received positive reviews in a peer review process involving five review categories. As rubidium easily substitutes chemically for potassium, it can be found doing so in small quantities in potassium-containing minerals such as biotite, potassium feldspar, and hornblende.