Lead isotope geochemistry is useful for providing isotopic dates on a variety of materials.
2.
Isotopic dating of shale mylonite in Pennsylvania reveals a K-Ar age of 372 + /-8 Ma.
3.
The accumulation of dislocations generated by high energy cosmic ray particle impacts provides another confirmation of the isotopic dates.
4.
Furthermore, isotopic dating of the rock samples provided the first time scale of polarity epochs for the last 3.2 million years.
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A number of spots within an age domains are selected and further dated accurately with the measurement tools by isotopic dating method.
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Scruncheon Seamount in the middle of the chain has given an isotopic date of 97.7 ?1.5 million years for the Newfoundland Seamounts.
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Matching the isotopic date with the altitude of where the rock was found gives the researchers a gauge of how fast the ice is melting.
8.
Because of the harsh radiations, unusual starting compositions, and long delays between events sometimes experienced, isotopic dating techniques are of special importance in the study of extraterrestrial materials.
9.
With isotopic dates, it became possible to assign absolute ages to rock units, and these absolute dates could be applied to fossil sequences in which there was datable material, converting the old relative ages into new absolute ages.
10.
The basin was formed by the impact of a large asteroid 3.9 billion years ago; using isotopic dating techniques, the scientists showed that the meteorite, a rock called an impact melt breccia, was formed at the same time.
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