Carbon dating exam questions

06 Mar

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.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.

carbon dating exam questions-27

Further, the silicon content of the melt becomes enriched toward the latter stages of crystallization.

On the upper left branch of this reaction series, olivine, the first mineral to form, Ml] react with the remaining melt to become pyroxene.

This reaction will continue until the last mineral in the series, biotite mica, is formed.

During the last stage of crystallization, after most of the magma has solidified, the remaining melt will form the minerals quartz, muscovite mica, and potassium feldspar.

Although these minerals crystallize in the order shown, this sequence is not a true reaction series.