Riverine particulate material dissolution as a significant flux of strontium to the oceans

Jones, Morgan T.; Pearce, Christopher R.; Jeandel, Catherine; Gíslason, Sigurður R.; Eiríksdóttir, Eydís Salome; Mavromatis, Vasileios; Oelkers, Eric H.

doi:10.1016/j.epsl.2012.08.040

Cited by 75 publications

(68 citation statements)

References 62 publications

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“…The first field evidence that this mechanism occurs in coastal areas and could account for 6-45% of the marine Sr budget imbalance was recently published [31]. These results confirmed earlier batch experiments that consisted of putting in contact basaltic river particles and seawater and allowed estimating that 2-10% of the Sr originally contained in the particulates was released to seawater during the four months of experiment [30].…”

Section: Competitors For Land-ocean Transferssupporting

confidence: 77%

“…Batch experiments or sequential leaching slightly illuminated the processes by confirming that a fraction of the lithogenic material can be dissolved, releasing some of the elements it contains and contributing to balance their isotopic composition [29][30][31][32]51]. These experiments also showed that secondary phases are rapidly formed, scavenging a large part of most of the released species.…”

Section: (D) What Do the Models Tell Us?mentioning

confidence: 70%

“…However, because seawater is close to saturated or supersaturated with respect to many mineral phases, much of the chemical input into seawater from atmospheric or riverine transported particulate material dissolution should be readily precipitated as secondary mineral, consistent with the 'Boundary Exchange' hypothesis. This could affect the net element input flux, but not so clearly its isotopic composition and the impact of this composition on the local seawater [29][30][31][32]. Precise flux estimates will depend on a comprehensive understanding of processes governing particle-solution exchanges, opening a large field for further researches.…”

Section: Introductionmentioning

confidence: 99%

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Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

Jeandel¹

2016

Phil. Trans. R. Soc. A.

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Section: Competitors For Land-ocean Transferssupporting

confidence: 77%

Section: (D) What Do the Models Tell Us?mentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

Jeandel¹

2016

Phil. Trans. R. Soc. A.

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“…Enhancement of weathering rates after deglaciations and tectonic uplifts (Hodell et al, 1989;Krabbenhöft et al, 2010;Porder et al, 2007;Stoll and Schrag, 1998;Taylor and Blum, 1995;Vance et al, 2009) and associated incongruent weathering of silicates (Blum and Erel, 1997), the ease of weathering of island arcs (Allègre et al, 2010), the release of Sr from riverine particulate matter (Jones et al, 2013), and uncertain estimates of the lowtemperature alteration of the oceanic crust (Butterfield et al, 2001;Derry, 2009) and groundwater discharge (Basu et al, 2001) all contribute to the divergence of modeling and observations. Furthermore, while the radiogenic Sr isotope system can provide information about the Sr input fluxes to the ocean it is not suitable for quantification of Sr output fluxes.…”

Section: Introductionmentioning

confidence: 99%

The Phanerozoic δ88/86Sr record of seawater: New constraints on past changes in oceanic carbonate fluxes

Vollstaedt

Eisenhauer

Wallmann

et al. 2014

Geochimica et Cosmochimica Acta

107

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The isotopic composition of Phanerozoic marine sediments provides important information about changes in seawater chemistry. In particular, the radiogenic strontium isotope ( 87 Sr/ 86 Sr) system is a powerful tool for constraining plate tectonic processes and their influence on atmospheric CO 2 concentrations. However, the 87 Sr/ 86 Sr isotope ratio of seawater is not sensitive to temporal changes in the marine strontium (Sr) output flux, which is primarily controlled by the burial of calcium carbonate (CaCO 3 ) at the ocean floor. The Sr budget of the Phanerozoic ocean, including the associated changes in the amount of CaCO 3 burial, is therefore only poorly constrained. Here, we present the first stable isotope record of Sr for Phanerozoic skeletal carbonates, and by inference for Phanerozoic seawater (δ 88/86 Sr sw ), which we find to be sensitive to imbalances in the Sr input and output fluxes. This δ 88/86 Sr sw record varies from ~0.25‰ to ~0.60‰ (vs. SRM987) with a mean of ~0.37‰. The fractionation factor between modern seawater and skeletal The oceanic net carbonate flux of Sr (F(Sr) carb ) varied between an output of -4.7x10 10 mol/Myr and an input of +2.3x10 10 mol/Myr with a mean of -1.6x10 10 mol/Myr.On time scales in excess of 100Myrs the F(Sr) carb is proposed to have been controlled by the relative importance of calcium carbonate precipitates during the "aragonite" and "calcite" sea episodes. On time scales less than 20Myrs the F(Sr) carb seems to be controlled by variable combinations of carbonate burial rate, shelf carbonate weathering and recrystallization, ocean acidification, and ocean anoxia. In particular, the Permian/Triassic transition is marked by a prominent positive δ 88/86 Sr sw -peak that reflects a significantly enhanced burial flux of Sr and carbonate, likely driven by bacterial sulfate reduction (BSR) and the related alkalinity production in deeper anoxic waters. We also argue that the residence time of Sr in the Phanerozoic ocean ranged from ~1Myrs to ~20Myrs.

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“…Like many of the other coupled processes in the water-soil-gas-biota system, a strong link couples physical erosion to the weathering of silicate minerals (Millot et al, 2002;West et al, 2005). Efficient dissolution of silicate mineral particles in seawater may be further evidence of the important link between physical erosion and chemical weathering ( Jeandel et al, 2011;Jones et al, 2013). The significance of this link has been explored from a theoretical point of view within the framework of the geological evolution of the Earth surface (Gabet and Mudd, 2009;West, 2012).…”

Section: Erosionmentioning

confidence: 99%

Earthcasting the future Critical Zone

Goddéris

Brantley

2013

Elementa: Science of the Anthropocene

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As humans continue to impact the Critical Zone, we need to project how our environment will evolve into the future. To model such change requires the ability to simulate interactions among the lithosphere, pedosphere, hydrosphere, biosphere, and atmosphere -including the activities of humans. Such projections, which some have called earthcasts, must be made with mechanistic models that capture the important phenomena, as well as scenarios of human behavior. As an example, we present earthcasts of future weathering in the midcontinent of the USA into the next century of projected warming. Rates of sequestration of CO 2 from the atmosphere due to weathering will change in the future as carbonate and silicate minerals are dissolved or precipitated in soil. The downward or upward advance of the carbonate reaction front in the soil is an analogue of the oceanic lysocline. Like the movement of the oceanic lysocline in response to oceanic acidification, this terrestrial lysocline will likely move due to fluxes of CO 2 driven by human activity. Understanding this and other responses to perturbations will best be achieved using multiple models for earthcasting.

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Riverine particulate material dissolution as a significant flux of strontium to the oceans

Cited by 75 publications

References 62 publications

Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

The Phanerozoic δ88/86Sr record of seawater: New constraints on past changes in oceanic carbonate fluxes

Earthcasting the future Critical Zone

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