《Table 2 Stable carbon and oxygen isotope results of Wudaoliang stromatolites》

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《"Palaeoenvironmental setting of lacustrine stromatolites in the Miocene Wudaoliang Group, northern Tibetan Plateau"》

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The ablation spot measurements of laser ablation inductive coupled plasma-mass spectrometer were heterogeneous，possibly due to the low REE concentrations in carbonate minerals.To deduce this effect，we calculated the mean REE value of ablation spots in each lamina（Fig.5）.The very similar shale normalized REE patterns of laminae indicated that the heterogeneous signals could be eliminated by overlapping signals of the individual points.Similar integrations were made on the line-scan mode data.The results of stromatolite samples analysed by LA-ICP-MS were shown in Tables 3，4，5 and 6.TheΣREE of the stromatolites ranged from 3392 ppb to 5746 ppb（Table 3）.Nine dense laminae of the sample WDL-13-A had a meanΣREE concentration of 6286 ppb，whereas the eight porous laminae in this sample yielded a meanΣREE concentration of 4479 ppb（Table 5）.REE data of Wudaoliang stromatolites and reference samples in Table 3 were also presented in Fig.5，normalized by the Post-Archean Australian Shale（PAAS）.