Enhanced trapping of molybdenum by sulfurized marine organic matter of marine origin in Mesozoic limestones and shales

Tribovillard, Nicolas; Riboulleau, Armelle; Lyons, Timothy W.; Baudin, François

doi:10.1016/j.chemgeo.2004.08.011

Cited by 306 publications

(129 citation statements)

References 83 publications

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“…Li et al (2011) found elevated concentrations of organic sulfur in suspended particles near the chemocline in the Cariaco Basin water column and proposed that this indicated early OM sulfurization. Rapid OM sulfurization in particles sinking through the water column was also proposed to explain the high S:C ratios in certain OM-rich rocks (van Dongen et al, 2006;Tribovillard et al, 2004). Support for the feasibility of more rapid OM sulfurization is also provided by laboratory experiments.…”

Section: Introductionmentioning

confidence: 91%

Rapid organic matter sulfurization in sinking particles from the Cariaco Basin water column

Raven

Sessions

Adkins

et al. 2016

Geochimica et Cosmochimica Acta

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Organic matter (OM) burial in marine sediments is a potentially important control on global climate and the long-term redox state of the earth's surface. Still, we have only a limited understanding of the processes that stabilize OM and facilitate its preservation in the geologic record. Abiotic reactions with (poly)sulfides can enhance the preservation potential of OM, but for this process to be significant it needs to compete with OM remineralization, the majority of which occurs before sinking particles reach the sea floor. Here we investigate whether OM sulfurization occurs within sinking particles in the Cariaco Basin, a modern sulfidic marine environment with high rates of OM burial.Proto-kerogen in sinking particles is frequently more sulfur-rich and 34 S-depleted than expectations for biomass, with a composition that is difficult to explain by mixing with resuspended or terrigenous material. Instead, it appears that sulfur is being incorporated into OM on a timescale of days in sinking particles. The flux of this abiogenic organic S from particles is equivalent to approximately two-thirds of the total amount of protokerogen S at 10 cm depth in underlying sediments (ODP Core 1002B); after 6000 years of more gradual sulfurization reactions, potential water column sources are still equivalent to nearly half of the total proto-kerogen S in Cariaco sediments. Water column sulfurization is most extensive during periods of upwelling and high primary productivity 2 and appears to involve elemental S, possibly via polysulfides. This process has the potential to deliver large amounts of OM to the sediments by making it less available for remineralization, generating OM-rich deposits. It represents a potentially dynamic sink in the global carbon cycle that can respond to changes in environmental conditions, including the size and intensity of O 2 -depleted environments. Water column OM sulfurization could also have played a more significant role in the carbon cycle during ocean anoxic events, for example during the Cretaceous.

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Section: Introductionmentioning

confidence: 91%

Rapid organic matter sulfurization in sinking particles from the Cariaco Basin water column

Raven

Sessions

Adkins

et al. 2016

Geochimica et Cosmochimica Acta

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“…Many researches indicated that the Mo in the water column could convert to thiomolybdates under the condition of high HS À activity, which then would be captured by iron sulfides and organic matter (Helz et al, 1996;Erickson and Helz, 2000;Tribovillard et al, 2004;Vorlicek et al, 2004). Generally, the concentration of Mo up to 20 mg/g in bulk sediments, accompanied with low Mn content indicates anoxic conditions and free hydrogen sulfide in the pore water.…”

Section: àmentioning

confidence: 99%

Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea

Niu

Dong

Chen

et al. 2016

Marine and Petroleum Geology

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“…In anoxic environments with minor amounts of dissolved sulfide, molybdate transported from the oxic environment is converted to a series of particle-reactive thiomolybdate (MoO x S 4−x 2− ) species (Helz et al, 1996). Furthermore, in euxinic seawater, in which aqueous hydrogen sulfide (H 2 S) exceeds a threshold concentration of about 11 mol, tetrathiomolybdate (MoS 4 2− ) forms and is rapidly scavenged by pyrite and organic matter, resulting in near-quantitative removal of Mo Erickson and Helz, 2000;Helz et al, 1996Helz et al, , 2011Huerta-Diaz and Morse, 1992;Tribovillard et al, 2004;Vorlicek and Helz, 2002;Vorlicek et al, 2004). This leads to significant Mo enrichment in the sediments as long as concentrations remain high in ambient seawater.…”

Section: Molybdenum Geochemistrymentioning

confidence: 99%

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Wang

Struck

Guo

et al. 2015

Precambrian Research

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Enhanced trapping of molybdenum by sulfurized marine organic matter of marine origin in Mesozoic limestones and shales

Cited by 306 publications

References 83 publications

Rapid organic matter sulfurization in sinking particles from the Cariaco Basin water column

Rapid organic matter sulfurization in sinking particles from the Cariaco Basin water column

Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

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