Fig. 5

PAAS-normalized rare earth element patterns of Wudaoliang stromatolites and reference samples. a PAAS-normalized REE patterns of samples WDL-13-A (ablation spot mode), WDL-13-D-1, WDL-13-D-2, WDL-10-C-1 and WDL-10-C-2 (line scan mode); b PAAS-normalized REE patterns of samples WDL-Carbonate, WDL-Shale, and WDL-Stromatolite. WDL-Carbonate and WDL-Shale were referred to the average REE composition of carbonate and shale of the Wudaoliang Group (Yi et al. 2008), WDL-Stromatolite was referred to the average REE composition of stromatolites in this study; c PAAS-normalized REE patterns of individually analysed laminae in sample WDL-13-A; d PAAS-normalized REE patterns of Wudaoliang stromatolites and reference samples. Banza aragonite (sample TGR21-I 1) was from Lake Tanganyika, East Africa (Barrat et al. 2000); Erbisberg travertine (Erb 1) and Wallerstein spring mound carbonate (Wa 98/8) were from Nördlinger Ries, western Bavaria, Germany (Arp et al. 2013); GRF stromatolite was from the Eocene Green River Formation, Wyoming, USA (Bolhar and Van Kranendonk 2007)