U-Pb ages of detrital-zircon grains from boreholes G2, G3, and CK3

Zircon grains were analyzed by laser-ablation inductively coupled plasma–mass spectrometer at the China University of Geosciences (Wuhan) and at the Tianjin Institute of Geology and Mineral Resources, following the analytical procedures of each laboratory. All the zircon grains were measured using a laser spot diameter of 32 μm. The ages reported here are 206Pb/238U ages for zircons younger than 1000 Ma and 207Pb/206Pb ages for older grains. Individual zircon with <90% concordance was rejected.

本数据集涉及的锆石颗粒分别于中国地质大学（武汉）及天津地质矿产研究所完成测试，测试采用激光剥蚀电感耦合等离子体质谱仪（laser-ablation inductively coupled plasma–mass spectrometer），严格遵循各实验室既定的分析流程。所有锆石颗粒均使用直径32 μm的激光斑进行测试。本文报道的年龄数据中，年龄小于1000 Ma的锆石采用206Pb/238U年龄值，年龄大于1000 Ma的锆石则采用207Pb/206Pb年龄值。谐和度低于90%的单颗锆石数据均被剔除。