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By the late 18th century, some naturalists had begun to look closely at the ancient rocks of the Earth.They observed that every rock formation, no matter how ancient, appeared to be formed from still older rocks.
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It has also been extensively applied to date extraterrestrial, early solar system events.
The accuracy of Rb–Sr ages, however, strongly depends on the accuracy of the U by comparing Rb–Sr ages of minerals with U–Pb ages obtained from the same intrusion.
If Rb-Sr ‘isochrons’ are actually the result of mixing lines, the collinear relationship between different isotopic compositions to begin with.
In proper usage, the phrase ‘isotope fractionation’ refers exclusively to the physical separation of one isotope of an element from another isotope of the same element.
It has been known for several decades that the lighter elements (notably carbon, oxygen, hydrogen and sulphur) undergo isotopic fractionation under the influence of their physical and chemical environment, and much research has been conducted to understand this behaviour.
‘Actually, the question of whether Sr isotopes can be fractionated by nature or not is irrelevant, because all Sr isotope analysis are routinely corrected for all isotopic fractionation effects, be they natural or laboratory-induced.Authigenic minerals are deposited directly from seawater and hence display good initial Sr isotope homogeneity.However, they are highly susceptible to recrystallisation after burial and do not necessarily remain closed systems.Comparing these rocks with the products of present erosion, sedimentation, and earth movements, these earliest geologists soon concluded that the time required to form and sculpt the present Earth was immeasurably longer than had previously been thought.James Hutton, a physician-farmer and one of the founders of the science of geology, wrote in 1788, “The result, therefore, of our present inquiry is, that we find no vestige of a beginning, — no prospect of an end.” Although this may now sound like an overstatement, it nicely expresses the tremendous intellectual leap required when geologic time was finally and forever severed from the artificial limits imposed by the length of the human lifetime.This content is available through Read Online (Free) program, which relies on page scans.