“…Therefore, the Re concentration and TOC are correlated in reduced sediments. Many previous studies have documented that both Re and Mo, and PGE as well, are mainly stored in pyrite in organic-rich sediments (Brumsack, 2006;Colodner, 1991;Gadd et al, 2019;Pašava et al, 2019;Rosenthal et al, 1995;Sundby et al, 2004;Wanty and Goldhaber, 1992;Zheng et al, 2000). For example, Gadd et al (2019) analyzed sulfide minerals in reduced sediments and the bulk sediments, using LA-ICP-MS, and found that the Re concentration in pyrite is as high as 500 ppm.…”