Yet the earth would still have had an initial (created) Pb isotopic endowment.
Once radioactive decay of U and Th started after creation, daughter Pb isotopes were added inside the earth.
Many in both the scientific community and the general public around the world thus remain convinced of the earth’s claimed great antiquity.
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Subsequently new crustal rocks formed via partial melts from the mantle.
U decay in those rocks added daughter Pb isotopes to the common or initial Pb isotopes in them, inherited from the rock’s sources.
A variety of analytical instruments have also now been developed using different micro-sampling techniques coupled with mass spectrometers, thus enabling wide usage of U-Pb radioisotope dating.
However, problems remain in the interpretation of the measured Pb isotopic ratios to transform them into ages.
Nevertheless, the ultimate foundation of this U-Pb dating methodology is the assumption that the earth formed from the solar nebula.
However, from a biblical perspective the earth was created by God on Day 1 of the Creation Week before the sun and the rest of the solar system were created on Day 4, all only about 6000 or so years ago.
There is much evidence that these events are historically accurate. Historical evidence routinely includes ancient literature, business records, and government documents, analyzed in conjunction with linguistics, geography, and archaeological analysis of physical objects (pottery, coins, remains of buildings, etc.), using forensic science techniques.
After many millions of man-hours of research and evidence analysis, archaeology has repeatedly confirmed the reliability of the Bible.
Thus, without being able to unequivocally distinguish the daughter Pb atoms produced by in situ U and Th decay from the initial Pb atoms in a mineral or rock, it is impossible to determine their absolute U-Pb ages.
All the unprovable assumptions ultimately depend on an assumed deep time history.
The Bible has proven to be more historically and archaeologically accurate than any other ancient book.