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Different minerals in a given geologic setting can acquire distinctly different ratios of radiogenic strontium-87 to naturally occurring strontium-86 (Sr as the parent melt.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.Rubidium substitutes for potassium within the lattice of minerals at a rate proportional to its concentration within the melt.Our editor's unanimous pick for #1 is favored by our visitors for its fun layout, attractive members, & friendly community.
It can be difficult to meet other single seniors with whom you share common interests, goals, and backgrounds within your geographical area. The e Harmony membership pool is an ethnically, racially, and religiously diverse group of quality individuals of all ages, residing in all 50 states and more than 200 countries.The only problem is that we only know the number of daughter atoms now present, and some of those may have been present prior to the start of our clock. The reason for this is that Rb has become distributed unequally through the Earth over time.We can see how do deal with this if we take a particular case. For example the amount of Rb in mantle rocks is generally low, i.e. The mantle thus has a low If these two independent dates are the same, we say they are concordant.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.Each of these minerals has a different initial rubidium/strontium ratio dependent on their potassium content, the concentration of Rb and K in the melt and the temperature at which the minerals formed.
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