Rhenium osmium dating
The image on the left is the thallus or body of the algae. The bottom one contains some asexual spores, but sexual spores have also been found.(Nick Butterfield/University of Cambridge) "It confirms that this fossil is really special," said Gibson, an earth sciences Ph D student at Mc Gill.They'll only improve when more very ancient fossils are found.A few years ago, Roger notes that he and some colleagues did their own molecular clock analysis that suggested plants emerged earlier than Gibson and his colleagues calculated."So it looks like there will be more debates about these things in the future! Gibson and Halverson's study was coauthored by researchers from Lawerence Berkeley National Laboratory in Berkeley, Calif., the California Institute of Technology, the University of Alberta, and the Geological Survey of Canada.It was funded by the Agouron Institute, the Natural Sciences and Engineering Research Council of Canada, the Polar Continental Shelf Program, the Geological Association of Canada and the Geological Society of America.A Canadian-led study aims to settle the controversy over extraordinary Arctic fossils that represent the oldest known sexually reproducing organism and the oldest multicellular organism that used photosynthesis.The fossil organism identified as a red algae called But the fact that its age could have been anywhere in a 500-million year span led to some controversy.
Calculations of density from the X-ray diffraction data may produce the most reliable data for these elements, giving a value of 22.587 ± 0.009 g/cm 3 for osmium, slightly denser than the 22.562 ± 0.009 g/cm 3 of iridium; both metals are nearly 23 times Using Rhenium and Osmium in tank penetrators would mean using metals two to five times more precious than gold as tank ammunition.
Os ratio, have been used extensively in dating terrestrial as well as meteoric rocks.
It has also been used to measure the intensity of continental weathering over geologic time and to fix minimum ages for stabilization of the mantle roots of continental cratons.
Now researchers from Mc Gill University, using a relatively new radiochemical dating technique, have estimated that the fossils are between 1.03 billion and 1.06 billion years old.
The fact that they're significantly less than 1.2 billion years old will likely reassure biologists who were previously skeptical of the fossil, said Timothy Gibson, lead author of the new study published earlier in December in the journal Geology.