GHF HIGHLIGHTED PUBLICATIONS
June 17th, 2015
In situ U-Pb geochronology and thermochronology
Automated ablation of large numbers of samples (up to 750 unknowns in one day)
Trace element characterization and 2-D trace element/age mapping
High-spatial resolution (4 um) linear or curvilnear linescans (rotating slit)
Flexible mounting capability (thin section, epoxy rounds or irregular shapes)
Offline point location and ablation sequencing
Software coordination and overlay of optical, SEM, CL images
Direct ablation of targets identified by TIMA analysis
Import and registration of X-Y coordinates from external sources
The LA-ICPMS comprises a Resonetics S-155-LR 193nm excimer laser ablation system coupled to an Agilent 7700x quadrupole ICPMS. The Excimer laser is also coupled to a RESOchron helium analysis line for in situ (U-Th-Sm)/He, U-Pb and trace element analysis of single crystals.
We also have a separate Alphachron helium line with a diode laser and furnace in order to facilitate conventional (U-Th)/He dating on single mineral crystals and larger samples.
To be installed in late 2015
LA-ICPMS is commonly applied to: the determination of the trace element composition of solid materials (rock forming minerals, fused rock powder, glasses, fluid inclusions, archaeological artefacts, ceramics, plastics, and biological materials like otoliths, teeth, bones, shells), the in situ dating of a variety of minerals, isotopic analysis, 2D elemental mapping, and the determination of mineral-melt partition coefficients.
Thermochronology can be used to determine: thermal histories for tectonic and landscape evolution studies, the age of young volcanic rocks, the thermal evolution of hydrocarbon source rocks in sedimentary basins, orogenic uplift/denudation rates in metallogenic regions (landscape evolution), palaeoclimate conditions at the time of channel iron deposit genesis, relative fault displacement (i.e., to find offset ore deposits), the parameters required for inverse modeling of the thermal history of hydrothermal ore deposits, the prospectivity of a potential geothermal reservoirs, the thermal fluid flow history of prospective nuclear repository sites and as a new tool for diamond explorers.
1. Kirkland, C.L., Smithies, H., Taylor, R., Evans, N.J., McDonald, B. 2015. Zircon Th/U ratios in magmatic environs. Lithos 212-215, 397-414.
2. Taylor, R., Clark, C., Fitzsimons, I.C.W., Santosh, M., Hand, M., Evans, N.J. and McDonald, B. 2014. Post-peak, fluid-mediated modification of granulite facies zircon and monazite: an example from the Trivandrum Block, southern India. Contributions to Mineralogy and Petrology, DOI 10.1007/s00410-014-1044-0.
3. Doubliera, M.P., Thébaud, N., Wingate, M.T.D., Romano, S.S., Kirkland, C.L., Gessner, K., Moleb D.R., Evans N.J. 2014. Structural constraints on Neoarchean gold mineralization in the Southern Cross district (Yilgarn Craton, Western Australia) reveal leading role of late magmatic intrusions. Journal of Structural Geology, doi:10.1016/j.jsg.2014.02.009.
4. Marillo-Sialer, E., Woodhead, J.D., Hergt, J., Greig, A. Guillong, M., Gleadow, A., Evans, N.J., Paton, C. 2014. The zircon ‘matrix effect’: evidence for an ablation rate control on the accuracy of U-Pb age determinations by LA-ICP-MS. Journal of Analytical Atomic Spectrometry, 29, 981-989. doi:10.1039/c4ja00008k.
5. Evans, N.J., McInnes, B.I.A., McDonald, B.J., Danišík, M., Jourdan, F., Mayers, C., Thern, E. and Corbett, D. 2013. Emplacement age and thermal footprint of the diamondiferous Ellendale E9 lamproite pipe, Western Australia. Mineralium Deposita, 48, 413-421.
6. Danišík, M., Ramanaidou, E.R., Evans, N.J., McDonald, B.J., Mayers, C. and McInnes, B.I.A. 2013. (U-Th)/He chronology of the Robe River channel iron deposits, Hamersley Province, Western Australia. Chemical Geology, 354, 150-162.
7. Danišík, M., Shane, P., Schmitt, A.K., Hogg, A., Santos, G.M., Evans, N.J., Storm, S., Fifield, K., Alloway, B. and Lindsay, J., 2012. Re-anchoring the late Pleistocene tephrochronology of New Zealand based on concordant radiocarbon ages and combined 238U/230Th disequilibrium and (U-Th)/He zircon ages. Earth and Planetary Science Letters, 349-350. 240-250.
8. Schmitt, A.K., Danišík, M., Evans, N.J., Seibel, W., Kiemele, E., Aydin, F. and Harvey, J.C. 2011. Acigöl rhyolite field, Central Anatolia (Part 1): High-resolution dating of pre-eruptive zircon residence and rhyolite eruption episodes. Contributions to Mineralogy and Petrology, 62 (6) 1215-1231.
9. Danišík, M., Pfaff, K., Evans, N.J., Manoloukos, C., Staude, S., McDonald, B.J., Markl, G. 2010. Tectonothermal history of the Schwarzwald Ore District (Germany): An apatite triple dating approach. Chemical Geology, 278 (1-2), 58-69.
10. McInnes, B.I.A., Evans, N.J, McDonald, B.J., Kinny, P. and Jakimowicz, J. 2009. Zircon U-Th-Pb-He double dating of the Merlin kimberlite field, Northern Territory, Australia. Lithos, 112S, 592-599.
11. McInnes, B.I.A., Evans, N.J., Fu, F.Q. and Garwin, S. 2005. Application of thermochronology to hydrothermal ore deposits. Reviews in Mineralogy and Geochemistry 57 (13), 3149-3158.
12. Evans, N.J., Byrne, J.P., Keegan, J.T. and Dotter, L.E. 2005.Determination of uranium and thorium in zircon, apatite and fluorite: Application to laser (U-Th)/He Thermochronology. Journal of Analytical Chemistry, v. 60/12, p. 1159-1165.