Fig. 7From: Authigenic carbonate precipitation at the end-Guadalupian (Middle Permian) in China: Implications for the carbon cycle in ancient anoxic oceansRelationship between the δ13CDIC value and calcite saturation index (Ω) of the waters generated by mixing of the initial seawater (SW i ) with the seawaters in which sulfate reduction occurred (SW1, SW2, SW3) (Fig. 6). The mixing ratios of SW x to SW i (x = 1, 2, 3) are 0 to 0.5, and the tick marks on each curve represent the ratios; 0.1, 0.2, 0.3, 0.4, and 0.5 from right to left on each curve. The arrows represent the main ranges of δ13Ccarb values of randomly oriented and bundled calcites (right) and of packed calcites (left)Back to article page