TEMORA 1: a new zircon standard for Phanerozoic U–Pb geochronology

The formation of Qulong adakites and their relationship with porphyry copper deposit: Geochemical constraints

“…ICPMSDataCal 8.3 was used to process the original test data was for isotope ratios and the content of trace elements (Liu et al, 2010b,c); Isoplot 3.23 (Ludwig, 2000) was used to calculate the U-Pb age and single spot data error is 1σ, weighted average 206 Pb/ 238 U age is 2σ. The obtained mean weighted 206 Pb/ 238 U age 416 ± 5.5 Ma (2σ, MSWD = 0.5) from all the TEMORA zircons was obtained, which is consistent with the recommended values 416.75 ± 0.24 (Black et al, 2003), indicating that the data quality is reliable. Representative CL images and U-Pb concordia diagrams for zircon from the rock samples included in this study are shown in Figs.…”

Zircon U-Pb geochronology and heavy mineral composition constraints on the provenance of the middle Miocene deep-water reservoir sedimentary rocks in the Yinggehai-Song Hong Basin, South China Sea

“…Element corrections were made for mass bias drift, which was evaluated by reference to standard glass NIST SRM 610. The Temora was used as the age standard ( 206 Pb/ 238 U ¼ 416.8 Ma) (Black et al, 2003). The details of analytical procedure, precision and accuracy are described by Jackson et al (2004), Yuan et al (2004), Liu et al (2010).…”

Petrogenesis of the Early Eocene adakitic rocks in the Napuri area, southern Lhasa: Partial melting of thickened lower crust during slab break-off and implications for crustal thickening in southern Tibet

“…U-Pb isotope compositions of zircon grains from two samples (D175 and D182) were analyzed using the SHRIMP at the John de Laeter Centre of Mass Spectrometry of Curtin University of Technology in Perth, Western Australia. Both unknown zircon grains and zircon standards, TEMORA (for calibrating the U-Th-Pb ratios; 206 Pb/ 238 U =0.0668, corresponding to 417 Ma;Black et al, 2003) and CZ3 (for calibrating absolute U abundances; U = 551 ppm; Pidgeon et al, 1994) were analyzed under the following conditions: cycles of 7 scans, primary O 2− beam of~2 nA, spot size of~25 μm with a mass resolution of about 5000. The data have been reduced following the procedure described by Williams (1998) using the software SQUID (Ludwig, 2001).…”