The SX 100 “Ultrachron” project: an EPMA fully optimized for geochronology, achieving unprecedented precision in the timing of geological events.
In 2003 CAMECAlaunched the “Ultrachron” project with theUniversity of Massachusetts and the National Science
Foundation (USA) for the development of an EPMA fully
optimized for geochronology. • Ultrachron spectrometers with extra large PET crystal (VLPET) • Maximum collection area allows the highest intensity onPbM α , UM β without sacrificing energy resolution
PbM α
• BSE shield protects diodes during high-current mapping.
UM β Measured X-ray line intensity (a.u.) Size of PET Crystal (a.u.)
Selected references
Mahan, K.H., Goncalves, P., Williams, M.L., and Jercinovic, M.J. (2006) Dating metamorphic reactions and fluid flow: Application to exhumationof high-P granulites in a crustal-scale shear zone, western Canadian Shield. Journal of Metamorphic Geology 24, 193-217.Jercinovic, M.J., and Williams, M.L. (2005) Analytical perils (and progress) in electron microprobe trace element analysis applied to geochronology:Background acquisition, interferences, and beam irradiation effects. American Mineralogist 90, 526-546.Dahl, P.S., Terry, M.P., Jercinovic, M.J., Williams, M.L., Hamilton, M.A., Foland, K.A., Clement, S.M., and Friberg, L.M. (2005) Electron probe(Ultrachron) microchronometry of metamorphic monazite: Unraveling the timing of polyphase thermotectonism in the easternmost Wyoming Craton(Black Hills, South Dakota). American Mineralogist 90, 1712-1728.Goncalves, P., Williams, M.L., and Jercinovic, M.J. (2005) Electron microprobe age mapping. American Mineralogist 90 , 578-585.Williams, M.L., and Jercinovic, M.J. (2002) Microprobe monazite geochronology: Putting absolute time into microstructural analysis. Journal ofStructural Geology 24, 1013-1028.Janak, M., Konecny, P., Siman, P., and Holicky, I. (2004) Metamorphic history from electron microprobe dating of monazite: Variscan evolution ofThe Tatra Mountains. Geolines 17, 47-48.Sergio de Souza, Z., Montel, J.M. et al. (2006) Electron microprobe dating of monazite from high-T shear zones in the São José de CampestreMassif, NE Brazil, Gondwana Research, Volume 9, Issue 4, 441-455. CAMECA is the reference in micro- and nano-analysis, providing cutting-edge science and metrology solutions with unequaled customer support through a worldwide network of subsidiaries and agents. Corporate headquarters:CAMECA • 29 Quai des Grésillons • 92622 Gennevilliers Cedex • FRANCETel : +33 (0)1 43 34 62 00 • Fax : +33 (0)1 43 34 63 50 • gennev@cameca.com Subsidiaries:CAMECAGermany • sales.germany@cameca.com CAMECAInstruments Inc., USA • sales.usa@cameca.com CAMECAInstruments Japan KK • sales.japan@cameca.com CAMECAKorea Co. Ltd. • sales.korea@cameca.com CAMECATaiwan Corp. Ltd. • sales.taiwan@cameca.com
www.cameca.com
Application note
SX100
