Figure 13.

Integrated litho-, bio-, and chemo-stratigraphy of the Gaojiashan Member of the middle Dengying Formation at the Gaojiashan section. Geochemical profiles showing the data of carbonate contents (wt. %), carbonate carbon isotopes (δ¹³C_carb, ‰ V-PDB), carbonate oxygen isotopes (δ¹⁸O_carb, ‰ V-PDB), organic carbon isotopes (δ¹³C_org, ‰ V-PDB), nitrongen isotopes (δ¹⁵N, ‰ AIR), uranium isotopes (δ²³⁸U, ‰ CRM145), sulfur isotopes (δ³⁴S_TS, ‰ V-CDT) of total sulfur (TS, dominated by pyrite with trace amount of organic S) after a complete acidification of carbonates, carbonate associated sulfate (CAS) sulfur isotopes (δ³⁴S_CAS, ‰ V-CDT), Sr and Ca concentration (in ppm) ratios (Sr/Ca). Gray lines represent three-point running average of the chemostratigraphic data. ⁸⁷Sr/⁸⁶Sr values measured from limestone beds or limestone nodules in the Gaojiashan Member are also makred along the δ¹³C_carb profile. Data source: δ¹³C, δ¹⁸O, δ³⁴S, Sr/Ca data (Cui, 2015; Cui et al., 2016b), ⁸⁷Sr/⁸⁶Sr values (this study), δ¹⁵N data (Gamper, 2014), δ²³⁸U data (Zhang et al., 2018). Modified from (Cui et al., 2016b).