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THE Rb-Sr METHOD Unlike argon, which escapes effortlessly and completely from most molten rocks, strontium exists as a trace aspect in many minerals once they form.

THE Rb-Sr METHOD Unlike argon, which escapes effortlessly and completely from most molten rocks, strontium exists as a trace aspect in many minerals once they form.

The method that is rb-Sr in line with the radioactivity of 87 Rb, which undergoes simple beta decay to 87 Sr with a half-life of 48.8 billion years. Rubidium is a constituent that is major of few minerals, nevertheless the chemistry of rubidium is comparable to compared to potassium and salt, each of which do form many typical minerals, and thus rubidium does occur being a trace aspect hotornot in many rocks. Due to the lengthy half-life of 87 Rb, Rb-Sr relationship can be used mostly on stones avove the age of about 50 to 100 million years. This process is extremely helpful on stones with complex records considering that the child product, strontium, will not getting away from minerals nearly therefore effortlessly as does argon.