The chemical abrasion mineral dissolution and

The chemical abrasion, mineral-dissolution and isotope dilution technique, also termed “conventional”, which requires a high degree of control on many parameters to ensure highest data quality (Schaltegger et al., 2015). A multi-step procedure described as follows were performed at the State Key Laboratory of Isotope Geochemistry (SKLIG), GIGCAS.
Results
Conclusions and future work Minimization of laboratory blanks ensures high-precision U–Pb zircon analysis at GIGCAS. The total procedural blanks calcium ionophore maintained at ∼ 1 pg in the Guangzhou laboratory, suitable for the CA-ID-TIMS pretreatment and operation. The 206Pb/238U dates obtain at GIGCAS for standard zircons (R33) and 500 Ma solution are 419.88 ± 0.94 Ma (n = 7; MSWD = 6.8) and 500.50 ± 0.19 Ma (n = 9; MSWD = 0.84), respectively, in excellent agreement with the recommended values. Thus we are now able to measure the zircon standards and reference solution within 0.5% precision. Comprehensive procedures of CA-ID-TIMS technique therefore have been established at GIGCAS.
Acknowledgements Xin Li and Wen Zeng are thanked for their assistance in the clean laboratory. We gratefully acknowledge an anonymous reviewer for the constructive comments which helped to improve the manuscript. This research was supported by CAS technique R&D program and State Key Laboratory of Isotope Geochemistry (SKLIG-JY-14-03) to YTZ, and CAS Strategic Priority Research Program B (XDB18000000) to YGX. RM\'s visit to GIGCAS was supported by the CAS visiting professorship (2013T1Z0005). This is Paranemic joint contribution no. IS-2370 from GIGCAS.