In the past the use of fluid inclusions in minerals as a geothermometer has been confined to the direct observation of the disappearance of the gas phase by means of a microscope and heating stage. More recently the breaking out of the inclusions as the mineral is heated, has served to indicate the temperature of complete filling of the inclusions by the liquid phase. Apparatus is described for recording the rate of break out and the interpretation of the recorded curves is discussed.

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