I was wondering how ice cores are dated accurately. I know Carbon 14 is one method, but some ice cores go back hundreds of thousands of years. Would other isotopes with longer half-lives be more accurate? Also, how much does it cost to date the core? How are samples acquired without destroying the ice? I imagine keeping the ice intact as much as possible would be extremely valuable.
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210Pb dating of marine sedimentary cores
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USGS Scientific Investigations Report
The apparent agreement between seemingly independent dating methods is seen as a powerful argument for millions of years. But closer inspection reveals that these methods are not truly independent, and the agreement between them is the result of circular reasoning. Since they also think some organisms lived only during certain periods of Earth history, they conclude that these fossils can be used to date different rock layers. For instance, suppose one particular organism has so far been found only in rocks thought to be between and million years old. In other words, the fossils found in rocks are used to date other rocks. But how does one determine an age for the initial set of rocks? One might assume those ages are obtained either directly or indirectly from radioactive dating techniques.
Lead isotope dating of marine sedimentary cores
Laboratories from 14 countries with different levels of experience in radiometric measurement of radionuclides in environmental samples and in the application of the Pb dating method participated in an interlaboratory comparison ILC exercise related to the application of the Pb sediment dating technique. The exercise was conducted in the framework of a research project coordinated by the IAEA. The participating laboratories were given aliquots from various strata of a marine sedimentary core collected from a bay near Sao Paulo, Brazil, and were asked to provide the mass activities of various radionuclides in each core stratum and an age vs. The results of this exercise show that the participating laboratories are highly skilled in the process of radiometric determinations, while, on the other hand, the dating results were not as successful, in part because the participating laboratories have widely varying experience with dating.
The mystery begins at drilling site U in the Gulf of Alaska on June 4, Get ready, you are about to embark on a scientific adventure! Source: IODP. The black and white sections represent different types of sediment layers. Make a prediction of the types of sediments you might encounter on the seafloor at site U
