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Uranium–lead dating
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Uranium–lead dating, abbreviated U–Pb dating, is one of the oldest and most refined of the radiometric dating schemes. It can be used to date rocks that formed and crystallised from about 1 million ye
Figure 1: Concordia diagram for data published by Mattinson for zircon samples from Klamath Mountains in Northern California. Ages for the concordia i
Figure 1: Concordia diagram for data published by Mattinson for zircon samples from Klamath Mountains in Northern California. Ages for the concordia increase in increments of 100 million years.
Zircon
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Zircon is a mineral belonging to the group of nesosilicates and is a source of the metal zirconium. Its chemical name is zirconium silicate, and its corresponding chemical formula is ZrSiO4. An empiri
Uranium–lead dating
…crystallised from about 1 million years to over 4.5 billion years ago with routine precisions in the 0.1–1 percent range. The method is usually applied to zircon. This mineral incorporates uranium and thorium atoms into its crystal structure, but strongly rejects lead when forming. As a result, newly-formed…
Zircon
A lustrous crystal of zircon perched on a tan matrix of calcite from the Gilgit District of Pakistan
A lustrous crystal of zircon perched on a tan matrix of calcite from the Gilgit District of Pakistan
Optical microscope photograph; the length of the crystal is about 250 μm
Optical microscope photograph; the length of the crystal is about 250 μm
Sand-sized grains of zircon
Sand-sized grains of zircon
A pale blue zircon gemstone weighing 3.36 carats
A pale blue zircon gemstone weighing 3.36 carats