How accurate is radioactive dating of materials
As the crystallization process continues, the composition of the melt (liquid portion of a magma, excluding any solid material continually changes.For example, at the stage when about 50 percent of the magma has solidified, the melt will be greatly depleted in iron, magnesium, and calcium, because these elements are found in the earliest formed minerals.These long time periods are computed by measuring the ratio of daughter to parent substance in a rock and inferring an age based on this ratio.
This calls the whole radiometric dating scheme into serious question.
The general idea is that many different minerals are formed, which differ from one another in composition, even though they come from the same magma.
The mineral makeup of an igneous rock is ultimately determined by the chemical composition of the magma from which it crystallized.
Most scientists today believe that life has existed on the earth for billions of years.
This belief in long ages for the earth and the existence of life is derived largely from radiometric dating.
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C and counting the amount of each) allows one to date the death of the once-living things.