Lava dating info

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The mineral makeup of an igneous rock is ultimately determined by the chemical composition of the magma from which it crystallized.

Such a large variety of igneous rocks exists that it is logical to assume an equally large variety of magmas must also exist.

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The determination of the age of such a material would give an old age, and thus account for the anomalies found.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.Of course, there are many problems with such dating methods, such as parent or daughter substances entering or leaving the rock, as well as daughter product being present at the beginning.In order to establish this dating method in this application an attempt has been made to trace the sources of the anomalies.To illustrate these efforts, dating results from a rhyodacite of Mauna Kuwale, Oahu, Hawaii, are reported.

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