An in situ technique for (U-Th-Sm)/He and U-Pb double dating
MetadataShow full item record
We report on a new laser-based technique for rapid, quantitative and automated in situ double dating (U-Pb and (U-Th-Sm)/He) of minerals, for applications in geochronology, thermochronology and geochemistry. In situ laser microanalysis offers several advantages over conventional bulk crystal methods in terms of spatial resolution, productivity, and safety. This new approach/methodology utilizes an interoperable and integrated suite of analytical instruments including a 193 nm ArF excimer laser system, quadrupole ICP-MS, quadrupole helium mass spectrometry system and swappable flow-through and ultra-high vacuum analytical chambers. We describe the analytical protocols for zircon analysis including grain mounting in Teflon, parameters for parent and daughter isotopic measurement, and standard development, and provide a freeware application for determining (U-Th-Sm)/He 'pairwise' ages from analytical data. The in situ double dating method described is applied to the Ellendale lamproite pipe and country rocks, Western Australia and successfully replicates conventional U-Pb and (U-Th-Sm)/He age variations determined previously by conventional techniques.
Showing items related by title, author, creator and subject.
Assessment of wastewater and recycled water quality: A comparison of lines of evidence from in vitro, in vivo and chemical analysesLeusch, F.; Khan, S.; Gagnon, Marthe Monique; Quayle, P.; Trinh, T.; Coleman, H.; Rawson, Christopher; Chapman, H.; Blair, P.; Nice, H.; Reitsema, Tarren (2014)We investigated water quality at an advanced water reclamation plant and three conventional wastewater treatment plants using an “ecotoxicity toolbox” consisting of three complementary analyses (chemical analysis, in vitro ...
Hackett, Mark; Ashley Hollings; Caine, S.; Bewer, B.; Alaverdashvili, M.; Takechi, Ryu; Mamo, John; Jones, M.; de Jonge, M.; Paterson, P.; Pickering, I.; George, G. (2018)A unique combination of sensitivity, resolution, and penetration make X-ray fluorescence imaging (XFI) ideally suited to investigate trace elemental distributions in the biological context. XFI has gained widespread use ...
Thermochronological record of Middle–Late Jurassic magmatic reheating to Eocene rift-related rapid cooling in the SE South China BlockTao, N.; Li, Zheng-Xiang; Danisik, Martin; Evans, Noreen; Batt, G.; Li, W.; Pang, C.; Jourdan, Fred; Xu, Y.; Liu, L. (2017)We investigate the Mesozoic–Cenozoic thermal history of the Daxi region (central SE South China Block) to evaluate the influence of the subduction of the Paleo-Pacific oceanic plate beneath the SE South China Block along ...