Articles | Volume 6, issue 2
06 Dec 2017
 | 06 Dec 2017

Extreme isotopologue disequilibrium in molecular SIMS species during SHRIMP geochronology

Charles W. Magee Jr., Martin Danišík, and Terry Mernagh

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Cited articles

Aleinikoff, J. N., Schenck, W. S., Plank, M. O., Srogi, L., Fanning, C. M., Kamo, S. L., and Bosbyshell, H.: Deciphering igneous and metamorphic events in high-grade rocks of the Wilmington Complex, Delaware: Morphology, cathodoluminescence and backscattered electron zoning, and SHRIMP U–Pb geochronology of zircon and monazite, Geol. Soc. Am. Bull., 118, 39–64, 2006.
Black, L. P., Kamo, S. L., Allen, C. M., Davis, D. W., Aleinikoff, J. N., Valley, J. W., Mundil, R., Campbell, I. H., Korsch, R. J., Williams, I. S., and Foudoulis, C.: Improved 206Pb/238U microprobe geochronology by the monitoring of a trace-element-related matrix effect; SHRIMP, ID–TIMS, ELA–ICP–MS and oxygen isotope documentation for a series of zircon standards, Chem. Geol., 205, 115–140, 2004.
Carson, C. J., Worden, K. E., Scrimgeour, I. R., and Stern, R. A.: The Palaeoproterozoic evolution of the Litchfield Province, western Pine Creek Orogen, northern Australia: Insight from SHRIMP U–Pb zircon and in situ monazite geochronology, Precambrian Res., 166, 145–167, 2008.
Chamberlain, K. J., Wilson, C. J. N., Wooden, J. L., Charlier, B. L. A., and Ireland, T. R.: New Perspectives on the Bishop Tuff from Zircon Textures, Ages and Trace Elements, J. Petrol., 55, 395–426, 2014.
Claoué-Long, J., Compston, W., Roberts, J., and Fanning, C. M.: Two Carboniferous ages: a comparison of SHRIMP zircon dating with conventional zircon ages and 40Ar/39Ar analysis, in: Geochronology Time Scales and Global Stratigraphic Correlation, edited by: Berggren, W. A., Kent, D. V., Aubrey, M. P., and Hardenbol, J., Society for Sedimentary Geology, SEPM Special Publication No. 54, 3–21, 1995.
Short summary
The paper demonstrates that isotopologue disequilibrium can be created in the SIMS ionization process, and that the specific conditions under which it is created during the oxygen bombardment of geological materials are consistent with known conditions where traditional interrelationships between ion abundances break down. Further study to determine the degree of radiation dosage at which extreme disequilibrium appears involved Raman and helium dating on a variety of well-characterized zircons.