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However, there is still a way to extract a date from the rock.

In the reasoning that follows, the reader may recognize a sort of family resemblance to the reasoning behind step heating in the Ar-Ar method, although the two are not exactly alike. When an igneous rock is first formed, its minerals will contain varying concentrations of rubidium and strontium, with some minerals being high in rubidium and low in strontium, others being high in strontium and low in rubidium.

Because they are chemically indistinguishable, they will appear in the same ratio in every mineral at the time when it is formed: some minerals will have more strontium, some will have less, but all must necessarily have the same The initial state of the rock may therefore be schematically represented by the graph to the right, which shows the initial states of four minerals imaginatively named A, B, C, and D.

The rubidium-strontium (Rb–Sr) method is used to determine ages of geologic events, and it serves as a tracer of geochemical processes.

For example, an object with a quarter of its original amount (2x1/2) should be roughly 11,460 years old.

In all radiometric procedures there is a specific age range for when a technique can be used.

The isotope potassium-40 (k-40) decays into a fixed ratio of calcium and argon (88.8 percent calcium, 11.2 percent argon).

Since argon is a noble gas, it would have escaped the rock-formation process, and therefore any argon in a rock sample should have been formed as a result of k-40 decay.

rubidum strontium dating-71rubidum strontium dating-68

So we have every reason to think that rocks when they form do incorporate strontium, and Sr in particular.

Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678.

Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air.

Rb and Sr isotopes are analyzed by mass spectrometers that are specialized to provide accurate abundance data at high sensitivity.

Rubidium is a chemical element with symbol Rb and atomic number 37.

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