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The closure temperature for moderate cooling rates is about 350Ar laser probe geochronology are selected on the basis of suitability of location, structural relations and mineralogy.

The selected samples are crushed, sieved and washed before mineral separation. Magnetic mineral separation is done with a Carpco roll magnet, which separates minerals on the basis of magnetic susceptibility.

Ar is constant: 5) The sample must have remained a closed system since the event being dated (Mc Dougall and Harrison, 1999).

The step-heating degassing experiments are carried out as described by Wijbrans (1995).

Radiation from the sun strikes the atmosphere of the earth all day long.

This energy converts about 21 pounds of nitrogen into radioactive carbon 14.

Most fresh biotites have potassium contents in the range of 7 to 8%.

In rapidly cooled igneous rocks the age of the biotite closely approximates the age of formation of the rock.

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