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Topic: Radiometric dating


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  Radiometric Dating and the Geological Time Scale
Radiometric dating provides numerical values for the age of an appropriate rock, usually expressed in millions of years.
Skeptics of radiometric dating procedures sometimes claim these techniques should not work reliably, or only infrequently, but clearly the results are similar: for intervals that should be about 70-80 million years old, radiometric dates do not yield (for example) 100 or 30 million years, let alone 1000 years, 100 000 years or 1 billion.
The other dates are completely consistent with a lower boundary for the Campanian of 83±1 million years ago, as suggested by Harland et al.
www.talkorigins.org /faqs/dating.html   (5229 words)

  
  Radiometric dating - Wikipedia, the free encyclopedia
Radiometric dating is a technique used to date materials based on a knowledge of the decay rates of naturally occurring isotopes, and the current abundances.
Radiometric dating can be performed on samples as small as a billionth of a gram using a mass spectrometer.
The uranium-lead radiometric dating scheme is one of the oldest available, as well as one of the most highly respected.
en.wikipedia.org /wiki/Radiometric_dating   (2394 words)

  
 Evolution Happens Radiometric Dating Page
Radiometric dating is based on index fossils whose dates were assigned long before radioactivity was discovered.
Radiometric dating is based on the half-lives of the radioactive isotopes.
Be assured that multiple dating methods used together on igneous rocks are almost always correct unless the sample is too difficult to date due to factors such as metamorphism or a large fraction of xenoliths.
www.evolutionhappens.net /radiometric.htm   (2246 words)

  
 A Radiometric Dating Resource List
Radiometric dating actually allows the measurement of absolute ages, and so it is deadly to the argument that the earth cannot be more than 10,000 years old.
It is a "handout" for the Astronomy 100 course taught by Skrutskie at the University of Massachusetts, Amherst.
C dating will be performed at the Vienna Environmental Research Accelerator (VERA), a new centre for AMS at the Institut for Radiumforschung und Kernphysik of the University of Vienna, which came into operation in 1996.
www.tim-thompson.com /radiometric.html   (3518 words)

  
 More Bad News for Radiometric Dating
Geologists assert that older dates are found deeper down in the geologic column, which they take as evidence that radiometric dating is giving true ages, since it is apparent that rocks that are deeper must be older.
But even if it is true that older radiometric dates are found lower down in the geologic column, which is open to question, this can potentially be explained by processes occurring in magma chambers which cause the lava erupting earlier to appear older than the lava erupting later.
For our topic on radiometric dating and fractional crystallization, there is nothing that would prevent uranium and thorium ores from crystallizing within the upper, lighter portion of the magma chamber and descending to the lower boundaries of the sialic portion.
www.cs.unc.edu /~plaisted/ce/dating2.html   (11376 words)

  
 Age of the Earth
The concerns about these dating methods were exactly the same that creationists continue to raise - presence of the daughter element at the time the rock was formed and possible loss / gain of either the parent or daughter element at some point in the history of the rock.
The other problem to avoid when dating rocks is the possibility that changes to the rock have caused loss or gain of either the parent or daughter element - this would lead to a false date (too old if parent element were lost, too young if daughter element were lost).
Scientists have no reason to claim an age of the earth of 4.5 billion years except for the results of decades of research and thousands of tests by independent researchers indicating the effectiveness of radiometric dating and that 4.5 billion years is the correct age of the earth.
www.gate.net /~rwms/AgeEarth.html   (2489 words)

  
 Unreliability of Radiometric Dating and Old Age of the Earth
Radiometric dating methods estimate the age of rocks using calculations based on the decay rates of radioactive elements such as uranium, strontium, and potassium.
The uncertainties inherent in radiometric dating are disturbing to geologists and evolutionists...
Radiometric dating is predicated on the assumption that throughout the earth's history radioactive decay rates of the various elements have remained constant.
www.bible.ca /tracks/dating-radiometric.htm   (20799 words)

  
 - Radiometric Dating Game -
Radiometric dating is commonly used on igneous rocks (lava), and on some sedimentary minerals.
Radiometric dating is predicated on the assumption that throughout the earth’s history radioactive decay rates of the various elements have remained constant.
This is taken as a confirmation of radiometric dating, since the earth’s rotation should be gradually slowing down due to the effect of the moon and tides.
www.trueorigin.org /dating.asp   (20920 words)

  
 Radiometric Dating
Radiometric dating is the primary dating scheme employed by scientists to determine the age of the earth.
Radiometric dating techniques take advantage of the natural decay of radioisotopes.
Many of the ages derived by radiometric dating techniques are highly publicized.
www.allaboutcreation.org /radiometric-dating.htm   (748 words)

  
 Radioactive 'dating' in conflict!
Potassium-argon (K-Ar) ‘dating’ was performed on the two outcrop samples by the AMDEL laboratory in Adelaide (Australia), while one of the two outcrop samples and two drill core samples, one being in contact with the fossil wood, were ‘dated’ by Geochron Laboratories.
While the quality and accuracy of the analytical work undertaken by all the laboratories involved is unquestionably respected, all the calculated ‘ages’ are mere interpretations based on unproven assumptions about constancy of radioactive decay rates, and on the geochemical behaviour of these elements (and their isotopes) in the unobservable past.
Yet here these radioactive ‘dating’ methods are again demonstrated to be unreliable and clearly useless at determining the true age of the wood and basalt.
www.answersingenesis.org /docs/382.asp   (1718 words)

  
 Assumptions of Radiometric Dating
Sedimentary rocks normally cannot be dated with radiometric methods (there are a few exceptions) because they do not have crystals that were consolidated at the time the rock was formed.
Therefore, since sedimentary rock is the only kind of rock that bears fossils, a relative date is estimated by the position of a sedimentary rock in relation to an igneous outflow.
We believe that since evolutionists expect certain rocks to yield dates that agree with their theory, no laboratory will publish dates that are wildly out of whack, or they wouldn't get paid for producing a result that would be hotly contested as experimental error.
www.rae.org /radiodat.html   (668 words)

  
 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.
The uncertainties inherent in radiometric dating are disturbing to geologists and evolutionists...
If in a few instances creationist discussion of anomalies in radiometric dating is based on a misunderstanding of the literature, there are plenty of other acknowledged anomalies that they could have used just as well.
www.cs.unc.edu /~plaisted/ce/dating.html   (22012 words)

  
 Earlham College - Geology 211 - Radiometric Dating
Dr. Willard F. Libby (1908-1980) and a team of students at the Institute for Nuclear Studies applied their knowledge of the isotope Carbon-14 (an unstable isotope found in organic material) to measure the age of objects that had known historical ages, such as artifacts from ancient Egypt.
Though radioactive materials had been used as early as 1907 (uranium-lead methods) to determine approximate ages, this was the first study to use known dates to prove their findings correct.
By successfully matching historical ages with measured radioactive decay, Libby opened the door to other types of radiometric dating, which would contribute to more specific dates on the vast geologic time scale.
www.earlham.edu /~smithal/radiometric-origins.htm   (287 words)

  
 Radiometric Dating
If the sedimentary rock were dated, the age date would be the time of cooling of the magma that formed the igneous rock.
To date a sedimentary rock, it is necessary to isolate a few unusual minerals (if present) which formed on the seafloor as the rock was cemented.
At death, Carbon 14 exchange ceases and any Carbon 14 in the tissues of the organism begins to decay to Nitrogen 14, and is not replenished by new C-14.
www.gpc.edu /~pgore/geology/geo102/radio.htm   (857 words)

  
 Radiometric Dating
The time it takes for the half of the material made up of the "parent element" to decay into the "daughter element" is different for different isotopes.
A mass spectrometer is used to measure the Parent/daughter ratio, which can be used to calculate how long the rock has been around.
Igneous Rocks and Radiometric Dating Determining the 'time' in the geologic timescale.
library.thinkquest.org /C0110291/basic/earth/radiometric.php   (149 words)

  
 - The True.Origin Archive -
The Dating Game (David Plaisted)—examines the facts behind radiometric (& other) dating methods cited by evolutionists to “prove” their million-year scenarios.
Bibliographies of selected non-evolutionist print publications dealing with origins-related matters for those interested in further reading off-line.
-->John Woodmorappe answers Glenn R. Morton’s persistent misuse of Woodmorappe’s list of discrepant isotopic dates.
www.trueorigin.org   (2711 words)

  
 Welcome to Virtual Age - Dating   (Site not responding. Last check: 2007-09-21)
Click on the "System and technical requirements" link if you need to get the new Flash 7 Player.
Virtual Dating contains two options as well as a demonstration version.
Virtual Dating Demo If you just want to do a quick run-through of the activity, try the "Demo" version-- answer checking and other feedbacks are not implemented.
www.sciencecourseware.org /VirtualDating   (131 words)

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