K 40 dating

The method relies on satisfying some important assumptions: Given careful work in the field and in the lab, these assumptions can be met.

The rock sample to be dated must be chosen very carefully.

If one of these protons is hit by a beta particle, it can be converted into a neutron.

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Since the rate at which this conversion occurs is known, it is possible to determine the elapsed time since the mineral formed by measuring the ratio of U, as the source of radiogenic heat.While the Indo-Eurasian–Laurentia tectonic analogy is incomplete, it is sufficiently compelling in explaining the electromagnetic and other data that it is a useful basis for understanding the Proterozoic assembly of Laurentia. Although carefully collected, accuracy cannot be guaranteed. Differing provisions from the publisher's actual policy or licence agreement may be applicable.The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas.The interpretations of the electromagnetic observations are analogous with the Tertiary to modern-day tectonic development of southeast Asia.The foreland basin succession would reflect the closing of the South China Sea and the deep-marine basin may be analogous to the Andaman Sea and North Sumatra basin.Electrical anisotropy may be indicative of the successive lateral accretion of oceanic crust beneath the continental shelf followed by shortening.

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