Fig. 4: Model calculation of P_benf as a function of C_org/P_reac.

Four panels display calculated P_benf results at different mass accumulation rate. a 0.5 g cm⁻² kyr⁻¹, b 1.0 g cm⁻² kyr⁻¹, c 5.0 g cm⁻² kyr⁻¹, and d 10.0 g cm⁻² kyr⁻¹. Different colors of lines refer to the results of different TOC contents. The solid lines represent modeled results of 10% euxinic sediment, while the dashed lines indicate an increase and decrease of this value by a factor of 1.5. The filled circles in A indicate the modeled results for intervals A, B, and C.