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Explain the importance of the following dating methods: (a) radio carbon dating, (b) potassium argon dating, (c) seriation, (d) stratigraphy.
Ar) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy.
The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. The sample is then degassed in a high-vacuum mass spectrometer via a laser or resistance furnace.
This essay shall focus on the importance of radio carbon dating, potassium argon dating, seriation and stratigraphy to the archaeological study.
Accurate dating has always been of importance to scientist and archaeologist alike.
This is why most people say carbon dating is only good for objects less than 40,000 years old.
Nothing on earth carbon dates in the millions of years, because the scope of carbon dating only extends a few thousand years.
However, in a metamorphic rock that has not exceeded its closure temperature the age likely dates the crystallization of the mineral.
This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.
From what i have read, The accuracy of carbon-14 dating is very controversial. it is also based upon decaying potassium into argon gas and the rate of decay. Interestingly, dating a substance with both K-AR and C-14 sometimes produces dates that are a hundred million years apart.
Dating of movement on fault systems is also possible with the Ar method.
Different minerals have different closure temperatures; biotite is ~300°C, muscovite is about 400°C and hornblende has a closure temperature of ~550°C.