Höhn et al. (2021) proposed that the giant Gamsberg Zn deposit, South Africa, initially formed as a sedimentary exhalative (SEDEX) deposit during the Mesoproterozoic and was subsequently oxidized near surface. The oxidized ore was then supposedly sulfidized by sulfur-rich metamorphic fluids during and after upper amphibolite facies metamorphism. We view this model as untenable for various reasons and suggest that the Gamsberg deposit and others in the Aggeneys-Gamsberg district (Swartberg, Broken Hill-Deeps, Big Syncline) are metamorphosed clastic SEDEX deposits rather than having formed by synmetamorphic sulfidation processes.

霍恩等人。(2021) 提出南非巨型 Gamsberg 锌矿床最初在中元古代形成为沉积喷流 (SEDEX) 矿床，随后在地表附近被氧化。据推测，在上部角闪岩相变质过程中和之后，氧化矿石被富含硫的变质流体硫化。由于各种原因，我们认为这种模型是站不住脚的，并认为 Gamsberg 矿床和 Aggeneys-Gamsberg 地区的其他矿床（Swartberg、Broken Hill-Deeps、Big Syncline）是变质碎屑 SEDEX 矿床，而不是由同变质硫化过程形成的。