Encyclopedia of Scientific Dating Methods

Living Edition
| Editors: W. Jack Rink, Jeroen Thompson

Uranium Series, Opal

  • James B. Paces
Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-6326-5_230-1

Synonyms

Definition

Uranium series dating. A geochronological method that uses intermediate decay products in the 238U or 235U radioactive decay chains to measure the length of time required to reach the current state of radioactive disequilibrium from an initial condition.

Opal. Amorphous or only partially crystalline hydrated silicon dioxide (SiO2nH2O) precipitated from aqueous solutions in near-Earth-surface environments.

Mineralogy and Geochemistry of Opal

Opal is a common mineraloid found near the surface of the Earth that consists of silica containing nonstructural water (SiO2nH2O). Opal typically forms by precipitation of colloidal silica from silica-saturated aqueous solutions in response to decreases in temperature, neutralization of alkaline solutions, increases in salinity, or evaporative concentration. Sedimentation of colloidal microspheres (<500 nm) results in deposits of amorphous silica gel. Subsequent dewatering...

Keywords

Thermal Ionization Mass Spectrometry Laser Ablation Inductively Couple Plasma Mass Spectrometry Thermal Ionization Mass Spectrometer Opal Hemisphere Isotope Dilution Thermal Ionization Mass Spectrometry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science Business Media Dordrecht (outside the USA) 2014

Authors and Affiliations

  1. 1.Geosciences and Environmental Change Science CenterU.S. Geological Survey, Denver Federal CenterDenverUSA