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Ion microprobe U–Pb geochronology of xenotime in sandstones from the same succession produces three sets of radiometric data.Detrital xenotime grains yield ages between 31 Ma (consistent with the detrital zircon data; between 34 Ma), whereas compositionally distinct xenotime overgrowths yield a weighted mean age of 1800 ± 14 Ma for the oldest population and 1662 ± 15 Ma for a younger population.Together with stratigraphic principlesradiometric dating methods are used in geochronology to establish the geologic time scale.

This study uses new field observations and existing studies to shed new light on the origin and significance of two NW–SE striking orogens in NW and NE Vietnam.We conclude that the architecture of each belt is a stack of NE-directed nappes formed either under deep ductile synmetamorphic conditions, or under shallow depth in the SW and NE parts, respectively.Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbonin which trace radioactive impurities were selectively incorporated when they were formed.The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.And its mass resolution is 40,000, meaning that it can distinguish between atoms that differ in mass by as little as one part in 40,000.

That's analogous to discriminating between a 20-ton whale (that's 40,000 pounds) and a 20-ton whale who just ate a pound of plankton (that's 40,001 pounds).Radiometric dating is also used to date archaeological materials, including ancient radiometric dating example problems.Here I want to concentrate on another source of error, namely, processes that take place within magma chambers.The Song Ma zone and Song Chay ophiolitic melange represent two ophiolitic sutures.However, the Late Permian Song Da and Babu mafic rocks are not ophiolites but intraplate basalts related to the Emeishan plume.Plus, get practice tests, quizzes, and personalized coaching to help you succeed.