Re os age dating
When oil is formed from a source rock, a proportion of the Re and Os from the source rock is transferred to the oil, thus one can date the formation process using the Re - Os geochronometer.Furthermore, as Re and Os have been inherited from the source rocks, Os isotopes can be employed to correlate an oil with its source.Rhenium–osmium dating, method of determining the age of the important ore mineral molybdenite; the method is based upon the radioactive decay of rhenium-187 to osmium-187.The rhenium–osmium ratio in most minerals is too low to be of general use as a dating technique, but molybdenite (molybdenum disulfide, Mo S) has a very high ratio of rhenium to osmium; and workers have found that the osmium in molybdenite is practically pure radiogenic osmium-187.Notably, separating the lower and upper benches of the Matewan is a parting with very high sulfur content (28 wt.%), perhaps representing an early marine pulse prior to the full on transgression responsible for depositing the Betsie.Results from Re–Os geochronology date the base of the Betsie at 323 ± 7.8 Ma, consistent with previously determined age constraints as well as the palynoflora assemblage presented herein.Analytical and instrument developments over the past 25 years have improved the reliability and accuracy of the method such that precision now routinely approaches ~1% uncertainty.
The Re-Os geochronometer can aid in establishing a robust chronometric framework that is essential to fully understand the timing of events and processes through geologic time.
In general, between six and eight samples from the same stratigraphic interval are analysed to produce an isochron that provides a Re - Os age for the deposition of the shale with a typical uncertainty of between 1% and 5%.
The Os value calculated at the time of deposition (Osi) can also provide information on whether deposition occurred in a lacustrine or an open marine environment.
In addition to geochronology data, the Re-Os system yields a wealth of information on the weathering fluxes into a particular basin or ocean at a given time in Earth history.
The Osi data can be used in a complementary way to Sr isotopes (but with a shorter residence time: ~10 kyr vs.
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2 Myr) to provide high-resolution chemostratigraphy data that can reveal the effect of paleoenvironmental processes such as volcanism, tectonic reorganization, or extra-terrestrial impacts on geochemical and biological systems.