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A second advantage of the isochron method is that it contains internal checks on reliability.Look again at the isochron for the meteorite Juvinas Figure 3.Certainly this is not produced by an influx from outer space.Thus it would seem that a large amount of Ar40 was present in the beginning.These inclusions, called xenoliths meaning foreign rocksconsist primarily of olivine, a pale-green iron-magnesium silicate mineral.

Quite simply, xenoliths are one of the types of rocks that cannot be dated by the K-Ar technique.

Two studies independently discovered that the glassy margins of submarine pillow basalts, so named because lava extruded under water forms globular shapes resembling pillows, trap 40Ar dissolved in the melt before it can escape 36 This effect is most serious in the rims of the pillows and increases in severity with water depth.

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