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Research on SHRIMP-RG

Possible analyses include U-Pb and Pb-Pb ages, U-Th ages, trace element concentration (Li, F, Sc, Ti, Y, Nb, REE, Hf, Pb, Th, U), and combined age with trace elements can be performed on zircon mounted in epoxy, indium, or in-situ on thin section pieces or rock chips.

Analyses of U-Pb, Th-Pb, and/or Pb-Pb ages of titanite can be performed on SHRIMP-RG, but precision is typically limited by U content. Trace element measurements are routine (e.g., Li, B, F, P, V, Sr, Y, Zr, Nb, Ba, REE, Hf, Ta, Th, U). Analyses can be performed on grains mounted in epoxy, or in-situ from thin section pieces or rock chips

Ti measurements in quartz can be made with high-precision on SHRIMP-RG.

We have performed numerous tests on magmatic, metamorphic, and hydrothermal quartz and can accurately measure Ti down to <0.2 ppm.

Analyses of U-Pb, Th-Pb, and/or Pb-Pb ages of monazite are routine on SHRIMP-RG. Trace element concentration (Li, F, P, Sc, V, Mn, Ge, As, Sr, Zr, Y, REE, Hf, Pb, Th, U) can also be measured from separately, or combined with analyses of ages. Analyses can be performed on grains mounted in epoxy, or in-situ from thin section pieces or rock chips.

The SHRIMP-RG is uniquely equipped to perform trace element analyses of glass or silicate mineral with high spatial resolution and analytical precision at the ppm or ppb level, for most elements. Due to the high mass resolving power (MRP) of the SHRIMP-RG, many interfering molecules can be fully resolved from the isotope of interest, particularly for elements like Sc, Ti, Nb, Sr, Rb, and REE. 

U-Pb analyses on SHRIMP-RG are complicated because the uranium concentrations are typically low (<15 ppm), common Pb contamination can be high, and there are well-documented orientation effects that can bias calculated age (which can correlate with the orientation of the crystal) (Taylor et al., 2012; Schmitt and Zack 2012). We implement several procedures that help combat these analytical issues.

In practice, any solid material can be measured on SHRIMP-RG for trace element or isotopic composition. The practicle limitations for obtaining quantitative compositional data are (1) standardization, (2) the abundance of the element(s) of interest, (3) possible isobaric interferences at the mass of interest, and (4) the precision required to answer your research questions. Because SIMS is a relative measurement approach, quantitative analyses require a matrix-matched standards that has been previously characterized for age, trace element and/or isotopic composition.