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U-Pb radioisotope dating is now the absolute dating method of first choice among geochronologists, especially using the mineral zircon.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.These new rocks rapidly accumulated more Pb isotopes due to the concurrent accelerated radioactive decay of U and Th in them during the Flood.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.There is also primordial Pb that the earth acquired when it formed, its isotopic composition determined as that of troilite in the Canyon Diablo iron meteorite.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.

(1969), have not been accompanied by any comparable improvement in the accuracy of the decay constants (Begemann et al.

Various methods have been devised to determine this initial or common Pb, but all involve making unprovable assumptions.

Zircon does incorporate initial Pb when it crystallizes. It cannot be proven that the Pb in apparently cogenetic U- or Th-free minerals is only initial Pb, and that it is identical to the initial Pb in the mineral being dated.

Once radioactive decay of U and Th started after creation, daughter Pb isotopes were added inside the earth.

Then catastrophic plate tectonics during the Flood stirred the mantle and via partial melting added new rocks to the crust.




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