Sentences with phrase «noble gas isotopes»

Temperature Reconstruction at WAIS Divide for the Last 1000 years, from Noble Gas Isotopes and Borehole Temperature.

Professor Mukhopadhyay continued «The geochemistry indicates that there are differences between the noble gas isotope ratios in different parts of Earth, and these need to be explained.

(e.g., tritium, the radioactive isotope of hydrogen, and its decay product, the noble gas isotope 3He).

He has recently established a state - of - the art 40Ar / 39Ar age dating and noble gas isotope geochemistry laboratory at the museum, funded by the Villum Foundation.

Not exact matches

To determine its origin, scientists performed a range of tests on the tiny pebble, examining its mineralogy, bulk chemistry, carbon isotope, and noble gas content.

But isotopes of some noble gases in the stone are nothing like those found in other meteorites, which all came from asteroids that formed inside the orbit of Jupiter.

By measuring the abundance of an isotope of the noble gas argon in the rock or its crystals, Gazel and his colleague Michael Kunk of the U.S. Geological Survey found that the magma was much younger than the last known volcanic event on the East Coast — which occurred when the supercontinent of Pangaea slowly pulled apart into North America, Africa and South America some 200 million years ago, forming the Atlantic Ocean in the process.

Greg Holland, a postdoctoral researcher in isotope geochemistry at the University of Manchester in England, and his colleagues measured the amounts of various isotopes of noble gases in the Bravo Dome gas field in New Mexico, where magmatic gases — primarily carbon dioxide — that allow the mantle to be sampled are buried hundreds of meters below.

The prevalences and isotope ratios of the noble, or inert, gases, such as neon, argon, krypton and xenon, provide a valuable tracer of ancient processes, because they are chemically nonreactive and so do not change much over time.

The researchers know these particular Buckyballs are extraterrestrial because the noble gases trapped inside have an unusual ratio of isotopes, atoms whose nuclei have the same number of protons but different numbers of neutrons.

My research focuses on the application of noble gases and other isotopes to natural systems with emphasis on the oceans and groundwater.

«It is thought Dr Dennis, who is head of stable isotope and noble gas geochemistry laboratories, came to the attention of detectives after corresponding with climate change sceptic bloggers in North America, while he also refused to sign a petition in support of Prof Phil Jones, the man at the centre of the controversy.»