Zircon Dating Problems

Zircon Dating Problems




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Problems with U-Pb Radioisotope Dating Methodsβ€”2 . U & Pb . . .
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Another significant problem for zircon U-Pb dating is that zircon crystals in some metamorphic and granitic rocks yield much older ages than the accepted ages of the rocks . During episodes of crustal anatexis, radiogenic isotopes and other trace elements contained within the mineral phases comprising the source rock are redistributed .
Since igneous rocks have no fossils, this makes zircon valuable in dating them . Zircon also concentrates Uranium (You) and (although less so) Thorium (Th) and excludes lead (Pb), which means it has a very high U/Pb ratio . This means that any lead found in zircon minerals was made by radioactive decay, after the formation of the mineral .
That common or initial Pb is still a major problem for U-Pb dating , even after the establishment of these protocols and statistical "manipulations," is demonstrated by the most recent work by Tera (2017a, b) .
Finally, there is the problem of dating metamorphic zircons that may contain cores or fragments of inherited material . Fig . 6e illustrates an example of one of the Indian charnockites where near-spherical, multifaceted zircon of metamorphic origin include fragments of older, igneous grains . Since the depth of such inclusions is not known it is possible that laser ablation will sample such material and thus produce an age that will be too old .
While recognizing potential problems owing to the mobility of lead atoms within the zircon grain, they are completely blind to the many other unverifiable, worldview-based assumptions that govern their interpretation of their entire radiometric dating methodology .
The Concordia is particularly useful in dating of the mineral Zircon (ZrSiO 4) . Zircon has a high hardness (7 .5) which makes it resistant to mechanical weathering, and it is also very resistant to chemical weathering . . . . Some of the problems associated with K-Ar dating are Excess argon . This is only a problem when dating very young rocks or in . . .
It can be experimentally confirmed that molten Zircon rejects lead . This is highly significant, as it means that the initial conditions are known to a high level of confidence . The other point that Justin made was that the dating for Uranium/Lead can be derived from 3 sources: U238 decay, U235 decay and the lead isotope ratio .
Geologists are aware of the problem of initial concentration of daughter elements, and attempt to take it into account . U-Pb dating attempts to get around the lack of information about initial daughter concentrations by the choice of minerals that are dated . For example, zircons are thought to accept little lead but much uranium .
One of the (many) assumptions in radiometric dating , and specifically for U-Pb dating , is that most of the three lead (Pb) isotopes we see on earth (206 Pb, 207 Pb and 208 Pb)β€”which today are produced by radiometric decay of Uranium (U), Thorium (Th), Actinium (Ac) and several other elements with radioactive isotopesβ€”were derived in the past only from radiometric decay of these elements . This is a completely arbitrary and unprovable assumption presupposing a naturalistic evolutionary . . .
One of Zircon's long-time consultants, Kurt Stauss works with the pros who need and use Zircon tools on the job . A seasoned tool and industry expert, Kurt travels across the globe to demonstrate how Zircon tools is the solution to everyday problems . More posts by this author
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Zircon Dating Problems
















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