Disadvantages of relative dating in geology

Posted by / 20-Mar-2016 04:37

Disadvantages of relative dating in geology

Thus, water evaporating from the ocean it starts off H2(18O) poor.

The water molecules composed of H2(18O) evaporate less rapidly and condense more readily then water molecules composed of H2(16O).

Of the temperature dependent markers the most important is the ratio of 18O to 16O.

The major disadvantage of this dating method is that isotopes tend to diffuse as time proceeds.

For similar reasons the ratio of deuterium to hydrogen acts the same way.

9Be and 35Cl) one can determine the season of the year the precipitation occurred.

This depletion is a temperature dependent process so in winter the precipitation is more enriched in H2(16O) than is the case in the summer.

As the water vapor travels towards the poles it becomes increasingly poorer in H2(18O) since the heavier molecules tend to precipitate out first.

This process also depends on the relative temperatures of different years, which allows comparison with paleoclimatic data.

Thus, each annual layer starts 18O rich, becomes 18O poor, and ends up 18O rich.

Both of these isotopes are produced by cosmic rays and solar irradiation impinging on the upper atmosphere, and both are quickly washed from the atmosphere by precipitation.

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