Is potassium argon dating reliable


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They sent these rocks to 2 labs and had them dated by potassium-argon dating to be between , and 1 million years old. Since the real age of the rocks was around 50 years, does this demonstrate that K-Ar dating is inaccurate? I can think of several possibilities in response to this question:. I haven't heard of this being done, however if you have some evidence to this effect please share it.

A-Z of Archaeology: 'K - K-Ar Dating' (Potassium - Argon Dating)

The answer to 1 may be what I'm after. I have very little knowledge in the field of radioactive dating, and I'm not even sure if 1 is a true statement. However if it is, then wouldnt this invalidate any results made using K-Ar dating? Please respond with and flaws in my reasoning or any additional reasons why the experiment was flawed. They sent these rocks to 2 labs and had them dated by potassium-argon dating to be either less than , years or up to 3. Statistically significant disparity in measured ages is inconsistent with the assumptions required to make radiometric dating predictions. Therefore no prediction of the theory has been contradicted.

Igneous rock often forms under conditions that favor 1.

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But not always -- contamination of both types is common. To falsify K-Ar dating, as the claim is attempting to do, one must not only show that the predictions of K-Ar measurements lead to incorrect years, but that both assumptions 1 and 2 hold. The claim shows one sample that dated to 3. While other answers are correct that the half-life of Potassium is very large, the 0. The claim "the real ratio of elements would indicate a 50 year old sample" lies more than 17 standard deviations away from the mean measurement, so it is very unlikely that the sample matched that prediction.

Creation Science Rebuttals, Potassium-Argon Dating of Volcanics

But here's a problem. The same flow yielded samples that dated to 1. These are also significant numbers. One sample also dated to less than , years ago, which appears to be the minimum measurable value, so is not a significant aberration. Radiometric dating would predict that, if the assumptions 1 and 2 hold, samples from the same flow would have the same age. Therefore, radiometric dating does not predict that the rocks would date accurately. Therefore this data cannot be used to falsify K-Ar dating, because it does not violate a prediction of radiometric dating.

Other methods, such as Isochron dating could potentially be used to show that the data are still consistent with current geological theory. This answer has been completely rewritten. I wrote the first draft thinking the entire range of reported dates represented the error bars on one sample, implying that the perceived dating error was not statistically significant.

I later realized that this was not the case.

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The hydration level of the basalt. There might also be a case for ' Argon inheritance '. The rock that came out of the volcano isn't magically reformed into brand new material: A Reply to "Scientific" Creationism by G. Geological Survey Open file report Your exact question is on page These flawed studies cite examples of "anomalous" ages from specific lava floes:.

Excess argon produced apparent ages ranging from million to 2. These authors cite a study by Funkhouser and Naughton on xenolithic inclusions in the flow from Hualalei Volcano on the Island of Hawaii. The flow is an unusual flow because it carries very abundant inclusions of rocks foreign to the lava. These inclusions, called xenoliths meaning foreign rocks , consist primarily of olivine, a pale-green, iron-magnesium silicate mineral.

They come from deep within the mantle and were carried upward to the surface by the lava. In the field, they look like large raisins in a pudding, and even occur in beds piled one on top of the other, glued together by the lava. 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 β€” fragments of rock and other material hurled into the atmosphere by the event β€” is deposited in a single layer with a unique geochemical fingerprint. Researchers can first apply an absolute dating method to the layer.


They then use that absolute date to establish a relative age for fossils and artifacts in relation to that layer. Anything below the Taupo tephra is earlier than ; anything above it is later. Generally speaking, the more complex a poem or piece of pottery is, the more advanced it is and the later it falls in the chronology. Egyptologists, for example, created a relative chronology of pre-pharaonic Egypt based on increasing complexity in ceramics found at burial sites.

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Sometimes called carbon dating, this method works on organic material. Both plants and animals exchange carbon with their environment until they die. Afterward, the amount of the radioactive isotope carbon in their remains decreases. Measuring carbon in bones or a piece of wood provides an accurate date, but only within a limited range. It would be like having a watch that told you day and night. Also called single crystal argon or argon-argon Ar-Ar dating, this method is a refinement of an older approach known as potassium-argon K-Ar dating, which is still sometimes used.

Both methods date rock instead of organic material. As potassium decays, it turns into argon. But unlike radiocarbon dating, the older the sample, the more accurate the dating β€” researchers typically use these methods on finds at least , years old.

Potassium-argon dating

While K-Ar dating requires destroying large samples to measure potassium and argon levels separately, Ar-Ar dating can analyze both at once with a single, smaller sample. The uranium-thorium method is often helpful for dating finds in the 40, to ,year-old range, too old for radiocarbon but too young for K-Ar or Ar-Ar. Commonly the ages of minerals from rather old rocks dated by the potassium-argon method are lower than the ages obtained by either the rubidium-strontium and uranium-lead dating.

Moreover, many studies have demonstrated that argon escapes readily during metamorphic events when rocks become heated and partially crystallized. This sample had not been exposed to the argon in the air over the 10 years since it was formed. Mineral Sample 40 K. Therefore any 40 Ar measured was not radiogenic argon.

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K-Ar Radiometric dating does not yield accurate ages under test conditions.