Disadvantages of rubidium strontium dating
It is also possible to use it on authigenic minerals, such as glauconite, in some sedimentary rocks.
Radiometric dating of minerals in metamorphic rocks usually indicates the age of the metamorphism.
The Rb–Sr decay system is one of the most widely used geochronometers for obtaining ages and cooling rates of terrestrial magmatic, metamorphic, and hydrothermal events.
It has also been extensively applied to date extraterrestrial, early solar system events.
Obviously, this works only for things which were once living.
Most scientists today believe that life has existed on the earth for billions of years.
Here I want to concentrate on another source of error, namely, processes that take place within magma chambers.
To me it has been a real eye opener to see all the processes that are taking place and their potential influence on radiometric dating.
Comparison of U–Pb emplacement ages with high-precision Rb–Sr mineral ages from three rapidly cooled igneous rocks covering an age range of ca.Radiometric dating uses the decay of isotopes of elements present in minerals as a measure of the age of the rock: to do this, the rate of decay must be known, the proportion of different isotopes present when the mineral formed has to be assumed, and the proportions of different isotopes present today must be measured.This dating method is principally used for determining the age of formation of igneous rocks, including volcanic units that occur within sedimentary strata.The discovery of radioactivity and the radiogenic decay of isotopes in the early part of the 20th century opened the way for dating rocks by an absolute, rather than relative, method.Up to this time estimates of the age of the Earth had been based on assumptions about rates of evolution, rates of deposition, the thermal behaviour of the Earth and the Sun or interpretation of religious scriptures.