Potassium-argon dating - Conservapedia
Request PDF on ResearchGate | K-Ar evidence for the Post-Paleozoic migration The igneous rocks, the majority dated by K/Ar mineral techniques, range in age from Delimitation of a cryptic Eocene tectono-thermal domain in the Eastern. The K Ar isotope systems of late Mesozoic horn-blende, muscovite, biotite and as reflected in three systematic variations: (1) a regional decrease in40Ar/39Ar dates with and isotopic mineral age relations of a contact zone in the Front Range . McBride S.L., Clark A.H., Farrar E., Archibald moadarticle.infotation of a cryptic. discordance between biotite and muscovite K-Ar dates, each decreasing consistently from SW to NE . biotite isograd defines the outer limit of the high T- low P.
In the case of a volcanic mineral, this means rapid cooling. Likewise, potassium has not been gained or lost.
K-Ar dating calculation (video) | Khan Academy
The decay constants of 40K are accurately known. Argon loss and excess argon are two common problems that may cause erroneous ages to be determined.
Excess argon may be derived from the mantle, as bubbles trapped in a melt, in the case of a magma. Both techniques rely on the measurement of a daughter isotope 40Ar and a parent isotope. Because the relative abundances of the potassium isotopes are known, the 39ArK produced from 39K by a fast neutron reaction can be used as a proxy for potassium.
Instead, the ratios of the different argon isotopes are measured, yielding more precise and accurate results. The amount of 39ArK produced in any given irradiation will be dependant on the amount of 39K present initially, the length of the irradiation, the neutron flux density and the neutron capture cross section for 39K.
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However, because each of these parameters is difficult to determine independantly, a mineral standard, or monitor, of known age is irradiated with the samples of unknown age.
The monitor flux can then be extrapolated to the samples, thereby determining their flux. This flux is known as the 'J' and can be determined by the following equation: In addition to 39Ar production from 39K, several other 'interference' reactions occur during irradiation of the samples.
Other isotopes of argon are produced from potassium, calcium, argon and chlorine.
As the table above illustrates, several "undesirable" reactions occur on isotopes present within every geologic sample. These reactor produced isotopes of argon must be corrected for in order to determine an accurate age.
Lies of Evolution: K-Ar Dating
The monitoring of the interfering reactions is performed through the use of laboratory salts and glasses. For example, to determine the amount of reactor produced 40Ar from 40K, potassium-rich glass is irradiated with the samples.
The desirable production of 38Ar from 37Cl allows us to determine how much chlorine is present in our samples. Multiple argon extractions can be performed on a sample in several ways.
Step-heating is the most common way and involves either a furnace or a laser to uniformily heat the sample to evolve argon. The individual ages from each heating step are then graphically plotted on an age spectrum or an isochron. Mechanical crushing is also a technique capable of releasing argon from a single sample in multiple steps.
Laser probes also allow multiple ages to be determined on a single sample aliquot, but do so using accurate and precise spatial control. For example, laser spot sizes of microns or less allow a user to extract multiple argon samples from across a small mica or feldspar grain.
Evolutionists are dating objects based on the imaginary geologic column, not by any scientific method.
K-Ar dating calculation
After finding this skull that upset their geologic column, the evolutionists took ten more samples, despite the fact that it was already dated MANY times. Lubenow, Bones of Contention, p.
They call this science? I'm amazed at the extraordinary faith so many evolutionists have to trust in the assumptions of a few men running around claiming they know the age of the earth based on the scientific method -- this is a joke, and a slap in the face, to those who do real scientific research. These same problems appear in all dating methods across the board. We cannot tell if samples have been contaminated, we cannot tell if the decay rates have always been the same, and when testing samples of known age, the process doesn't work.
So why is radiometric dating still being used? When talking about radiometric dating, it can best be compared to a magician using his cape to conceal his illusion. The average person can see a serious problem with the circular reasoning and the non-existance the geologic column is built on, so to hide the obvious, evolutionists throw a cloth over it called radiometric dating, claiming it is using the scientific method to get ages of billions of years, but it is nothing more than slight-of-hand falsely called science.
O Timothy, keep that which is committed to thy trust, avoiding profane and vain babblings, and oppositions of science falsely so called: Which some professing have erred concerning the faith.
That's exactly the case we have with radiometric dating.