Sentences with phrase «zircons containing»
The scientists identified 656 zircons containing dark specks that could be revealing and closely analyzed 79 of them with Raman spectroscopy, a technique that shows the molecular and chemical structure of ancient microorganisms in three dimensions.
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The graphite is older than the zircon containing it, the researchers said.
Zircon contains radioactive elements that enable researchers to determine its age.
Zircon contains lead, and this element can be removed from the mineral as it is melted and re-shaped by impacts.
Not exact matches
A research team led by John Tarduno of the University of Rochester in New York went to Australia's Jack Hills and collected ancient samples of rock containing the crystallized mineral zircon.
They then applied a precise dating technique based on natural radioactive decay of uranium, as Urs Schaltegger added: «In the sedimentary cross-sections, we found layers of volcanic ash containing the mineral zircon which incorporates uranium.
A younger volcanic deposit lying in the rock above these fossils includes zircons, tiny bits of silicate mineral that often contain trace amounts of uranium.
The carbon contained in the zircon has a characteristic signature — a specific ratio of carbon - 12 to carbon - 13 — that indicates the presence of photosynthetic life.
But its beach sands contained not just fragments of eroded lava but also zircons, a mineral associated with continental crust.
The secret to Mars» climate lies in the fact that zircons (ZrSiO4) contain oxygen, an element with three isotopes.
zircon A gemstone that contains traces of the radioactive element uranium.