Dating uranium 238

All minerals and raw materials contain radionuclides of natural origin.

dating uranium 238-13dating uranium 238-33

While these values do not compute an age for the Earth, they do establish a lower limit (the Earth must be at least as old as any formation on it).

This lower limit is at least concordant with the independently derived figure of 4.55 billion years for the Earth's actual age.

Unfortunately, the age cannot be computed directly from material that is solely from the Earth.

There is evidence that energy from the Earth's accumulation caused the surface to be molten.

Some of these rocks are sedimentary, and include minerals which are themselves as old as 4.1 to 4.2 billion years.

Rocks of this age are relatively rare, however rocks that are at least 3.5 billion years in age have been found on North America, Greenland, Australia, Africa, and Asia.

he generally accepted age for the Earth and the rest of the solar system is about 4.55 billion years (plus or minus about 1%).

This value is derived from several different lines of evidence.

As we pointed out in these two articles, radiometric dates are based on known rates of radioactivity, a phenomenon that is rooted in fundamental laws of physics and follows simple mathematical formulas.

Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.

Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.

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