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.

https://science.sciencemag.org/content/sci/early/2019/10/02/science.aax5345.full.pdf

Mineralogical control on the fate of continentally derived organic matter in the ocean

Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2

This work is supported by the National Science Foundation of China (grants 91528304, 41576005, and 41530964). We thank J. Li, X. Lyu, P. Li, K. Duan, J. Ronan, Y. Wang, P. Ma, and Y. Li for cruise assistance; G. de Lange and J. Hinojosa for editing an early version of manuscript; and E. Pope and two anonymous reviewers for their reviews.

/pdf/long-term-in-situ-observations-on-typhoon-triggered-10730fqqz5.pdf

Long-term in situ observations on typhoon-triggered turbidity currents in the deep sea

/pdf/source-to-sink-research-economy-of-the-earth-s-surface-and-xy3ye3zvv9.pdf

Ziding He

Papers

Source-to-sink transport processes of fluvial sediments in the South China Sea