An Essay on Radiometric Dating

The Radiometric Dating Game Radiometric dating methods estimate the age of rocks using calculations based on the decay rates of radioactive elements such as uranium, strontium, and potassium. On the surface, radiometric dating methods appear to give powerful support to the statement that life has existed on the earth for hundreds of millions, even billions, of years. We are told that these methods are accurate to a few percent, and that there are many different methods. We are told that of all the radiometric dates that are measured, only a few percent are anomalous. This gives us the impression that all but a small percentage of the dates computed by radiometric methods agree with the assumed ages of the rocks in which they are found, and that all of these various methods almost always give ages that agree with each other to within a few percentage points. Since there doesn’t seem to be any systematic error that could cause so many methods to agree with each other so often, it seems that there is no other rational conclusion than to accept these dates as accurate.

Geologic Age of the Earth

Are the results a confirmation of rapid formation of the geologic column as modern sedimentology studies have predicted? The discovery of collagen in a Tyrannosaurus-rex dinosaur femur bone was recently reported in the journal Science. Radiocarbon dating, dinosaur, bone collagen, organic carbon, bone bio-apatite, fossil wood, amber, megafauna Introduction Bone collagen and soft tissue were recently reported as having been discovered in a Tyrannosaurus dinosaur femur bone as well as other fossil bones from the Cretaceous period of the geologic column by Mary H.

dating methods (i.e., K-Ar and 40Ar/39Ar) have been historically successful in dating impact events, this study seeks to further develop the utility of (U-Th)/He.

Now it did yield the oldest K-Ar Isochron dates, but they were not old enough, since they should be several billion years. This one is better on the concordance of dates between different methods but only because Rb-Sr dates spans about million years, but internally the Rb-Sr dates are hardly concordant at all. In , a Nature paper was published that “corrected” time line, putting the Jurassic at Gradstein, [5] Most people will tell you that a measurement more than five years old is obsolete.

Such a selective nature of data casts doubt on the true nature of so-called “concordance”. Conclusion The real question is how likely is coincidental concordance of dates. This question was first dealt with in a study using completely random data, by John Woodmorappe. The study shows a high likelihood of fortunate concordance, mathematically explained by the birthday paradox.

Each trial consisted of strings of random numbers. In his book The Mythology of Modern Dating Methods , trying this little exercise produced the following results. First tried were concordant pairs which are at the same point in their respective lists occurred about 4. When the position on the lists were not important the odds of getting concordant pairs in random data were vary good.

A Reply to Dr. Henke and Others

Chronological Methods 9 – Potassium-Argon Dating Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials. Geologists have used this method to date rocks as much as 4 billion years old. It is based on the fact that some of the radioactive isotope of Potassium, Potassium K ,decays to the gas Argon as Argon Ar By comparing the proportion of K to Ar in a sample of volcanic rock, and knowing the decay rate of K , the date that the rock formed can be determined.

How Does the Reaction Work? Potassium K is one of the most abundant elements in the Earth’s crust 2.

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A Reply to Dr. Henke and Others A Reply to Dr. Henke and Others Dr. I initially responded to him by e-mail, and my responses are also recorded at that location. This article is a more extensive to reply to Dr. I may omit topics which are already adequately treated in my previous responses. I looked at the book by Dalrymple , as well as the article Dalrymple, G. I also read Woodmorappe’s new book. I plan to modify the Radiometric Dating Game article eventually.

Amino Acid Racemization Dating

What is an example of radiometric dating? Carbon 14 dating is the best known example of radiometric dating, but there are many others. Another example of radiometric dating is the dating of the age of geological formations on earth. The oldest known rocks on the earth that have been analyzed, have been dated back some 4.

The more sophisticated method Ar40/Ar39 using thermal neutron activation of K, in order to measure its amount, suffers from the same limitations, because of the need of neutron monitor samples of supposed known age (obtained by the standard K/Ar method).

Up to this time estimates of the age of the Earth had been based on assumptions about rates of evolution, rates of deposition, the thermal behaviour of the Earth and the Sun or interpretation of religious scriptures. Radiometric dating uses the decay of isotopes of elements present in minerals as a measure of the age of the rock: This dating method is principally used for determining the age of formation of igneous rocks, including volcanic units that occur within sedimentary strata.

It is also possible to use it on authigenic minerals, such as glauconite, in some sedimentary rocks. Radiometric dating of minerals in metamorphic rocks usually indicates the age of the metamorphism. Radioactive decay series A number of elements have isotopes forms of the element that have different atomic masses that are unstable and change by radioactive decay to the isotope of a different element. Each radioactive decay series takes a characteristic length of time known as the radioactive half-life, which is the time taken for half of the original parent isotope to decay to the new daughter isotope.

The decay series of most interest to geologists are those with half-lives of tens, hundreds or thousands of millions of years. If the proportions of parent and daughter isotopes of these decay series can be measured, periods of geological time in millions to thousands of millions of years can be calculated. To calculate the age of a rock it is necessary to know the half-life of the radioactive decay series, the amount of the parent and daughter isotopes present in the rock when it formed, and the present proportions of these isotopes.

It must also be assumed that all the daughter isotope measured in the rock today formed as a result of decay of the parent.

Systematic Sampling

What is an example of radiometric dating? Carbon 14 dating is the best known example of radiometric dating, but there are many others. Another example of radiometric dating is the dating of the age of geological formations on earth. The oldest known rocks on the earth that have been analyzed, have been dated back some 4. What is radiometric dating?

Fig. 2. 40Ar/39Ar age and 37Ar Ca/ 39Ar K ratio spectra obtained on plagioclase bulk samples and whole rocks from a section of the basal part of the Deccan traps in the Western Ghats (Igatpuri, see Fig. 1). Uncertainties on apparent ages are given at the 1c level, whereas plateau ages are given at the 2c level for comparison with other data.

Messenger Radiocarbon dating has transformed our understanding of the past 50, years. Professor Willard Libby produced the first radiocarbon dates in and was later awarded the Nobel Prize for his efforts. Radiocarbon dating works by comparing the three different isotopes of carbon. Isotopes of a particular element have the same number of protons in their nucleus, but different numbers of neutrons. This means that although they are very similar chemically, they have different masses.

The total mass of the isotope is indicated by the numerical superscript. While the lighter isotopes 12C and 13C are stable, the heaviest isotope 14C radiocarbon is radioactive. This means its nucleus is so large that it is unstable. Over time 14C decays to nitrogen 14N. Most 14C is produced in the upper atmosphere where neutrons, which are produced by cosmic rays , react with 14N atoms.

I really need help, What are some examples of Relative dating and Absolute dating

Slowly and painstakingly, geologists have assembled this record into the generalized geologic time scale shown in Figure 1. This was done by observing the relative age sequence of rock units in a given area and determining, from stratigraphic relations, which rock units are younger, which are older, and what assemblages of fossils are contained in each unit. Using fossils to correlate from area to area, geologists have been able to work out a relative worldwide order of rock formations and to divide the rock record and geologic time into the eras, periods, and epochs shown in Figure 1.

The last modification to the geologic time scale of Figure 1 was in the s, before radiometric dating was fully developed, when the Oligocene Epoch was inserted between the Eocene and the Miocene. Although early stratigraphers could determine the relative order of rock units and fossils, they could only estimate the lengths of time involved by observing the rates of present geologic processes and comparing the rocks produced by those processes with those preserved in the stratigraphic record.

Nov 13,  · Carbon dating is the standard method used by scientists fact, changing the environments surrounding the samples can alter was furious she loved her 2CV , and Anathoth, carbon 14 dating formula calculator and Alameth.I will give you some time to think about have not known the LORD.

Everything Worth Knowing About Scientific Dating Methods This dating scene is dead. The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results. Sometimes only one method is possible, reducing the confidence researchers have in the results. Methods fall into one of two categories: These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating.

One of the first and most basic scientific dating methods is also one of the easiest to understand. Paleontologists still commonly use biostratigraphy to date fossils, often in combination with paleomagnetism and tephrochronology. A submethod within biostratigraphy is faunal association: Sometimes researchers can determine a rough age for a fossil based on established ages of other fauna from the same layer — especially microfauna, which evolve faster, creating shorter spans in the fossil record for each species.

The polarity is recorded by the orientation of magnetic crystals in specific kinds of rock, and researchers have established a timeline of normal and reversed periods of polarity. Paleomagnetism is often used as a rough check of results from another dating method. Within hours or days of a volcanic eruption, tephra — fragments of rock and other material hurled into the atmosphere by the event — is deposited in a single layer with a unique geochemical fingerprint.


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Radioactive dating Radioactive dating is a method of dating rocks and minerals using radioactive isotopes. This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks.

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Potassium-argon (K-Ar) dating