Sentences with phrase «isotope hafnium»
Dr. Hoffmann: «The isotope Hafnium 176 in contrast to its counterpart Neodymium 143 was transported by means of weathering into the oceans and became part of iron - rich sediments on the sea floor 2,700 million years ago.»
https://www.sciencedaily.com/
During their investigations, the research team came to the surprising result that has been published in the journal Geology: 2.7 billion years ago, seawater contained an unusually high abundance of the radioactive isotope Hafnium 176 but a comparably low abundance of the radioactive isotope Neodymium 143, similar to what can be observed in present day seawater.
Not exact matches
The problem had been that the hafnium - tungsten dating technique depends not only on measuring the relevant isotopes in meteorites long ago blasted off Mars but also on knowing the relative proportion of hafnium and tungsten in the deep martian mantle.
A Cologne working group involving Prof. Carsten Münker and Dr. Elis Hoffmann and their student Sebastian Viehmann (working with Prof. Michael Bau from the Jacobs University Bremen) have managed for the first time to determine the isotope composition of the rare trace elements Hafnium and Neodymium in 2.7 - billion - year - old seawater by using high purity chemical sediments from Temagami Banded Iron Formation (Canada) as an archive.
Tungsten contains one isotope of mass 182 that is created when an isotope of the element hafnium undergoes radioactive decay, meaning its elemental composition changes as it gives off radiation.