isotopic geochronology
1Elbrous — Elbrouz Elbrouz Le mont Elbrouz vu depuis le nord. Géographie Altitude 5 642 m, Sommet occidental …
2Elbrouz —  Ne doit pas être confondu avec Elbourz. Elbrouz Le mont Elbrouz vu depuis le nord. Géograph …
3Mont Elbrouz — Elbrouz Elbrouz Le mont Elbrouz vu depuis le nord. Géographie Altitude 5 642 m, Sommet occidental …
4helium dating — Method of dating that depends on the production of helium during the decay of radioactive isotopes of uranium and thorium. Because of this decay, the helium content of any mineral or rock capable of retaining helium will increase during the… …
5dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …
6Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
7Thomas Edvard Krogh — Thomas Edvard Tom Krogh, FRSC (1936 ndash; April 29, 2008) was a geochronologist and a former curator for the Royal Ontario Museum. He revolutionized the technique of radiometric uranium lead dating with the development of new laboratory… …
8Radiometric dating — (often called radioactive dating) is a technique used to date materials such as rocks, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.[1]… …
9Sensitive high resolution ion microprobe — The sensitive high resolution ion microprobe (SHRIMP) is a large diameter, double focusing secondary ion mass spectrometer (SIMS). The SHRIMP is primarily used for geological and geochemical applications. It can rapidly measure the isotopic and… …
10Age of the Earth — This article is about scientific estimates of the age of the Earth. For religious and other non scientific estimates, see Dating Creation. Earth as seen from Apollo 17 The age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%) …
