The following quote from The Earth: An Introduction to Physical Geology by Tarbuck & Lutgens, pp.

55-57, (1987), gives us an idea of the tremendous complexity of the processes that occur when magma solidifies.

Lava erupting earlier would come from the top of the magma chamber, and lava erupting later would come from lower down.

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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 age is computed under the assumption that the parent substance (say, uranium) gradually decays to the daughter substance (say, lead), so the higher the ratio of lead to uranium, the older the rock must be.

Lava (properly called magma before it erupts) fills large underground chambers called magma chambers.

Most people are not aware of the many processes that take place in lava before it erupts and as it solidifies, processes that can have a tremendous influence on daughter to parent ratios.

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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.