Zircon dating definition

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Fission track dating is a radiometric dating technique based on analyses of the damage trails, or tracks, left by fission fragments in certain uranium -bearing minerals and glasses. The method involves using the number of fission events produced from the spontaneous decay of uranium in common accessory minerals to date the time of rock cooling below closure temperature. Fission tracks are sensitive to heat, and therefore the technique is useful at unraveling the thermal evolution of rocks and minerals. Most current research using fission tracks is aimed at: a understanding the evolution of mountain belts; b determining the source or provenance of sediments; c studying the thermal evolution of basins ; d determining the age of poorly dated strata ; and e dating and provenance determination of archeological artifacts.
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Trias (Geologie)

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CLM - What does CLM stand for? The Free Dictionary

How old are you? How old are your grandparents? Do you know how old Canada is? Or the pyramids in Egypt? Do you know how old Earth is?
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5.3: Sedimentary Rocks

A brown to colorless mineral, ZrSiO 4 , which is heated, cut, and polished to form a brilliant blue-white gem. All rights reserved. It occurs principally in igneous rocks and is an important source of zirconium, zirconia, and hafnia: it is used as a gemstone and a refractory. Formula: ZrSiO4. Copyright , , by Random House, Inc.
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For its extraction from zircon the mineral is heated and quenched in water to render it brittle, and then reduced to a fine powder, which is fused with three to four parts of acid potassium fluoride in a platinum crucible. Zircon , tourmaline, garnet and other precious stones of little commercial value are found throughout Australia. Other minerals present include diopside, pargasite, spinel, phlogopite, apatite, graphite, pyrrhotite and zircon Davidson Home Dictionary Meanings Zircon. A brown to colorless mineral, ZrSiO 4 , which is heated, cut, and polished to form a brilliant blue-white gem.
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