2017
DOI: 10.1038/s41467-017-00853-5
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Abstract: Authigenic clay minerals formed on or in the seafloor occur in every type of marine sediment. They are recognized to be a major sink of many elements in the ocean but are difficult to study directly due to dilution by detrital clay minerals. The extremely low dust fluxes and marine sedimentation rates in the South Pacific Gyre (SPG) provide a unique opportunity to examine relatively undiluted authigenic clay. Here, using Mg isotopes and element concentrations combined with multivariate statistical modeling, we… Show more

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Cited by 55 publications
(41 citation statements)
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“…Pore water evidence for the formation of authigenic Mg-clays is ubiquitous in the marine environment extending from the continental shelves to the abyssal ocean. The diagenetic processes lead to disseminated authigenic clay (mostly Al-silicate) with concentrations of a few wt.% of the bulk sediment so that authigenic clay deposits are rarely formed in those settings [73,74]. In contrast, physico-chemical conditions of some peri-marine regions favour their formation [75].…”
Section: Authigenic Mg-clay Minerals In Marine and Non-marine Modern mentioning
confidence: 99%
“…Pore water evidence for the formation of authigenic Mg-clays is ubiquitous in the marine environment extending from the continental shelves to the abyssal ocean. The diagenetic processes lead to disseminated authigenic clay (mostly Al-silicate) with concentrations of a few wt.% of the bulk sediment so that authigenic clay deposits are rarely formed in those settings [73,74]. In contrast, physico-chemical conditions of some peri-marine regions favour their formation [75].…”
Section: Authigenic Mg-clay Minerals In Marine and Non-marine Modern mentioning
confidence: 99%
“…Although in continental shelf and deep‐sea sediments, the bulk of the clay‐sized fraction is detrital (Kastner, ), the neoformation of authigenic clays in the marine realm can occur by low‐temperature interaction between amorphous hydr (oxides) (am‐ox fraction) and biogenic amorphous silica. Authigenic clay‐mineral formation requires sources of Al which is provided by the dissolution of unstable, amorphous Al (hydr‐)oxides or other highly weathered aluminosilicates (e.g., Mackenzie & Garrels, ) or volcanic ashes (Dunlea et al, ) and Si derived from biogenic opaline silica (e.g., Ehlert et al, ; Rahman et al, ). Mackenzie and Garrels () first suggested a general chemical reaction of the form amorphous0.25emAlsilicate and reactive0.25emAl0.25emOH3+HCO3+SiO2+cations=cation0.25emAlsilicate+CO2+H2normalO. …”
Section: Discussionmentioning
confidence: 99%
“…Recent studies have shown that reverse weathering reactions majorly affect the clay composition of sediments along continental margins (Baldermann et al, ; Dunlea et al, ; Ehlert et al, ; Rahman et al, ; Santiago Ramos et al, ; Wallmann et al, ). Moreover, Tosca et al () demonstrated that authigenic clays can form from dissolved constituents, not requiring Al or precursor phases.…”
Section: Discussionmentioning
confidence: 99%
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