Like all radiometric dating methods, if U-Pb gives a date concordant with the history on the creation/(geo)evolution debate in that area before. Uranium-Lead dating is a radiometric dating method that uses the decay . The common assumption evolutionary scientists use is that the. The billion-year radiometric 'age' of the earth is based on faulty for the first time that there is indeed a real problem in the uranium/lead evolution in.
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Otherwise your age determination would be faulty. Have the same process rate. Since the establishment of the system, the decay or process rate has remained stable and unchanged. If it were changed, then any calculation of the earth's age or the sample's age would be incorrect. To obtain a proper date, you would need to compensate for the fluctuating process rate.
The main and obvious problem with these assumptions is that they are not valid. Is there such a thing in nature as a closed system?
This is an ideal concept. But it is a non-existent ideal. The idea that a system in nature could remain closed that is, not influenced by any outside sources for millions or billions of years is absurd to the highest degree. Is it possible to know the original components of a system formed billions of years ago? According to evolutionists, there were no humans around during that time, so the notion that we can know the original components is once again absurd.
What process rate in an open system remains unchanged? Every process in nature operates at a rate influenced by many different factors. If one of the factors changes, the rate is altered. Any so called 'age determination' by a physical process is, once stripped down, only an educated guess, and is most likely entirely unrelated to the actual age. As we progress further in this evaluation, we will examine the actual processes by which these methods work, and carefully determine their validity and accuracy.
Despite the overwhelmingly dogmatic support from the textbook community, the methods are simply inconsistent in the answers they put forth. Of the dating methods that we will examine, the Uranium methods will be the first. The Uranium method is actually a compilation of a many methods. The function of this method is based on a chain of decay from Uranium and its sister element Thorium, into Lead and Helium.
This process is called "alpha decay". The positively charged atoms of helium gas, otherwise known as alpha particles, escape the nuclei of the parent atoms at rates which have been shown to be statistically constant.
There are three decay chains in the Uranium methods: To try to account for this, a radiometric dater will use many different samples and use the ones that fit the Concordia curve.
If they do not fit, it is assumed that it signifies a large geological event . History This method started to be used in . Uranium-lead dating is one of the first radiometric dating method that found the supposed age of the earth to be 4.
Detail of Process A zircon crystal in a rock The part of the rock a dater will use to date the rock is normally the zircon in the rock. It is assumed that when the rock cools to the point that it makes the zircon, all of the lead is excluded from the zircon.
If this is true, it makes the dating simple because if the half-lifes are correct, the dater only has to find the ratio of the amount of lead and uranium in the sample . The benefits of using zircon is that the trapping temperature is C.
This temperature makes the zircon hard to pull out substances out of it. From what has been observed, even small amounts of rock metamorphosis should not disturb the elements in the zircon. Another benefit is that zircon has been found in most igneous rocks. The last of the benefits is that the zircon, itself, is very hard. This fact helps with extracting the zircon out of the rock it was in .
Most radiometric daters prefer using zircon for these reasons, but it is not the only compound used for uranium-lead dating. Some other compounds used that have zirconium are zirconolite , and badeleyite. Other compounds that do not contain zirconium but are commonly used for this method are titanite , and monazite. Since most radiometric daters prefer using zircon for this process, geologists often call uranium-lead dating zircon dating .
Problems With all radiometric dating processes, the accuracy of uranium-lead dating is called into question. Though multi-stage lead samples cannot be used for generating isochrons, they can be used to produce valuable information through concordia-discordia plots. These plots are also self-checking and are useful for dating old rocks with complex histories. The plots can still produce valuable and accurate data using rocks that have been subjected to heating and metamorphic events Dalrymple This utility is due to the fact that the concordia-discordia method uses the simultaneous decay of U to Pb and U to Pb to tabulate age.
A sample concordia diagram from Dalrymple is shown in Figure 4. The change in ratios of parent to daughter isotopes over time is used to construct an age curve called a concordia. Since lead loss from a mineral does not fractionate the isotopes, the resulting change in parent to daughter isotope ratios will fall on a line called discordia, which connects the original age on concordia to the age on concordia of lead loss.
This method requires minerals that contain either no initial lead or negligible amounts of initial lead, but some such minerals can be found in igneous and metamorphic rocks Dalrymple As stated above, the Gerling-Holmes-Houtermans model requires that assumptions about the genetic relationship between the Earth and meteorites be made. Houtermans calculated the time required for lead composition of primordial lead samples to decay to the lead composition of young ores.
He used young terrestrial ores to obtain data for young ores and assumed the lead composition of the meteorite Canyon Diablo was representative of primordial lead. His result was 4. Houtermans did not provide a justification as to why the origins of the Earth and meteorites should be related, but Claire C. Patterson suggested that Earth lead would fall on the meteorite isochron if it had evolved in a closed system with the same initial lead composition as the meteorite over the past 4.
He supported this argument with lead measurements taken from deep ocean sediment. He later partnered with V. Murthy to strengthen the argument by showing that the meteoritic geochron and terrestrial geochron are nearly identical and probably evolved from the same uranium-lead system Dalrymple Some Creationist groups are attacking the reliability of radioisotope dating.
The RATE team cites isochrons obtained using Earth samples to claim that one of four types of discordance result when the mineral isochron method is applied as a test of the assumptions of radioisotope dating.
Since radioisotope data gathered by the RATE team demonstrates all four categories of isochron discordance, the team states that "the assumptions of radioisotope dating must be questioned" Austin Taylor, writing for the ChristianAnswers. Net website, also calls the assumptions of radioisotope dating into question. He cites the problem of initial amounts of daughter isotope and the assumption of closed systems in addition to other arguments Taylor
- Professor Timothy H. Heaton