We analysed six Last Interglacial and one Holocene coral of the genus Porites collected near the northern end of the Gulf of Aqaba (northern Red Sea) together with three recent corals from this location as a modern reference.While the values measured on the recent samples show no deviation from expected values, the Holocene and Last Interglacial corals display highly elevated ( U) plot and predicts that the true age of the coral can be calculated by intersecting this isochron with the seawater evolution curve.
Ages between 1000 and 300,000 years have been reported.
Uranium/Thorium dating of ferricretes from mid- to late Pleistocene glacial sediments, western Tasmania, Australia.
U) activity ratios higher than those expected from closed system evolution of seawater are an outstanding problem in U-series dating of fossil reef corals.
The increased activity ratios are ascribed to post-depositional diagenesis.
500 ka precipitation record from southeastern Australia: evidence for interglacial relative aridity.
The elevation and ages of the fossil terraces are consistent with existing sea level reconstructions from the Red Sea.
U at the time of sample formation must be known or calculated.
With time, Thorium 230 accumulates in the sample through radiometric decay.
The sample age is based on the difference between the initial ratio of U with the environment (i.e., that it is a closed system.) The method is used for samples that can retain Uranium and Thorium, such as carbonate sediments, bones and teeth.