Geological Institute, ETH Zurich, Zurich, Switzerland.
State Key Laboratory of Marine Geology, Tongji University, Shanghai, China.
Science. 2019 Nov 8;366(6466):742-745. doi: 10.1126/science.aax5345. Epub 2019 Oct 3.
First-order relationships between organic matter content and mineral surface area have been widely reported and are implicated in stabilization and long-term preservation of organic matter. However, the nature and stability of organomineral interactions and their connection with mineralogical composition have remained uncertain. In this study, we find that continentally derived organic matter of pedogenic origin is stripped from smectite mineral surfaces upon discharge, dispersal, and sedimentation in distal ocean settings. In contrast, organic matter sourced from ancient rocks that is tightly associated with mica and chlorite endures in the marine realm. These results imply that the persistence of continentally derived organic matter in ocean sediments is controlled to a first order by phyllosilicate mineralogy.
有机物质含量与矿物表面积之间的一级关系已被广泛报道，并与有机物质的稳定和长期保存有关。然而，有机-矿物相互作用的性质和稳定性及其与矿物成分的关系仍不确定。在这项研究中，我们发现在大陆起源的土壤有机物质在远海环境中的排放、分散和沉积过程中，从蒙脱石矿物表面被剥离。相比之下，与云母和绿泥石紧密相关的古老岩石中的有机物质在海洋环境中得以持久存在。这些结果表明，大陆起源的有机物质在海洋沉积物中的持久性在很大程度上受到层状硅酸盐矿物学的控制。
