Mass balance of dissolved lithium in the oceans

Stoffyn-Egli, Patricia; Mackenzie, Fred T.

doi:10.1016/0016-7037(84)90107-8

Cited by 117 publications

(66 citation statements)

References 49 publications

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“…In modern oceans, Li has a residence time of about 1 Myr and the principal input fluxes are continental weathering and hydrothermal activity, which are roughly equivalent (Hathorne & James, 2006;Misra & Froelich, 2012). The main sinks are secondary mineral formation during alteration of the oceanic crust and the incorporation of Li into marine sediments (Chan & Edmond, 1988;Chan et al, 2006;1992;Hathorne & James, 2006;Stoffyn-Egli & MacKenzie, 1984). The isotopic ratio of Li in modern oceans is ~31‰ (Tomascak et al, 1999).…”

Section: Weathering and The Li-isotope Composition Of The Oceansmentioning

confidence: 99%

“…Local effects like upwelling/downwelling and/or submarine groundwater discharge, which have been proposed as influences on Ca isotopes (Holmden et al, 2012), might have affected the local Li-isotope record. However, modern oceans are considered to be isotopically homogenous with respect to lithium (Chan & Edmond, 1988;Stoffyn-Egli & MacKenzie, 1984). influenced absolute values.…”

Section: Smaller Variations In Li-isotope Values During the Event Likmentioning

confidence: 99%

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Lithium-isotope evidence for enhanced silicate weathering during OAE 1a (Early Aptian Selli event)

Lechler

Strandmann

Jenkyns

et al. 2015

Earth and Planetary Science Letters

106

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An abrupt rise in temperature, forced by a massive input of CO 2 into the atmosphere, is commonly invoked as the main trigger for Oceanic Anoxic Events (OAEs). Global warming initiated a cascade of palaeoenvironmental perturbations starting with increased continental weathering and an accelerated hydrological cycle that delivered higher loads of nutrients to coastal areas, stimulating biological productivity.The end-result was widespread anoxia and deposition of black shales: the hallmarks of OAEs. In order to assess the role of weathering as both an OAE initiator and terminator (via CO 2 sequestration) during the Early Aptian OAE 1a (Selli Event, ~120 Ma) the isotopic ratio of lithium isotopes was analysed in three sections of shallowmarine carbonates from the Pacific and Tethyan realm and one basinal pelagic section from the Tethyan domain. Because the isotopic composition of lithium in seawater is largely controlled by continental silicate weathering and high-and lowtemperature alteration of basaltic material, a shift to lighter  7 Li values is expected to characterize OAEs. The studied sections illustrate this phenomenon:  7 Li values decrease to a minimum coincident with the negative carbon-isotope excursion that effectively records the onset of OAE 1a. A second negative  7 Li excursion occurs coeval with the minimum in strontium isotopes after the event. The striking similarity to the strontium-isotope record argues for a common driver. The formation and destruction (weathering) of an oceanic LIP could account for the parallel trend in both isotope systems. The double-spike in lithium isotopes is probably related to a change in weathering congruencies. Such a chemostratigraphy is consistent with the hypothesis that an increase in silicate weathering, in conjunction with organic-carbon burial, led to drawdown of atmospheric CO 2 during the early Aptian OAE 1a.

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Section: Weathering and The Li-isotope Composition Of The Oceansmentioning

confidence: 99%

Section: Smaller Variations In Li-isotope Values During the Event Likmentioning

confidence: 99%

Lithium-isotope evidence for enhanced silicate weathering during OAE 1a (Early Aptian Selli event)

Lechler

Strandmann

Jenkyns

et al. 2015

Earth and Planetary Science Letters

106

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“…Li is supplied to the oceans from rivers and from high-temperature hydrothermal circulation at ridge crests; it is removed from the oceans by incorporation in marine sediments enriched in Li relative to continental precursors and by low-temperature basalt alteration [Holland, 1978[Holland, , p. 200, 1984Edmond et al, 1979;Stoffyn-Egli and Mackenzie, 1984;Von Damm et al, 1985;Chan and Edmond, 1988]. Li is essentially conservative in seawater, with no significant involvement in biological activity or scavenging by particles [Stoffyn-Egli and Mackenzie, 1984}. Quantitative estimates of global fluxes are not well constrained, but hydrothermal input of Li is at least equal to the river flux at present and may be as much as a factor of 10 greater.…”

Section: Introductionmentioning

confidence: 99%

Lithium‐to‐calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells

Delaney¹,

Popp²,

Lepzelter³

et al. 1989

Paleoceanography

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Abstract.Li/Ca ratios in modern brachiopod shells generally correlate inversely with growth temperature, ranging from -20 pmol/mol at 30°C to -50 ~moljmol at ooc with no apparent interspecific have Li/Ca ratios around 70% of the modern average. These Li/Ca ratios can be explained by either somewhat higher temperature with constant seawater Li/Ca, somewhat lower seawater Li/Ca at constant temperature, or a combination of slightly elevated temperature and slightly lower seawater Li/Ca.

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“…The geochemical cycles of B and Li appear to be strongly influenced by both low-temperature diagenesis and the hydrothermal alteration of basalt (Edmond et al, 1979;Thompson, 1983;Seyfried et al, 1984;Stoffyn-Egli and Mackenzie, 1984). B and Li are conspicuously enriched in basalt altered by seawater at relatively low temperatures (Thompson, 1983;Donnelly, Pritchard, et al, 1980) but are leached from basalt during hightemperature hydrothermal alteration (Edmond et al, 1979;Edmond et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

“…Recent estimates of the magnitude of B and Li removal from seawater during low-temperature basalt-seawater interaction range up to 40% and 78% of the river flux of these species, respectively (Seyfried et al, 1984;Stoffyn-Egli and Mackenzie, 1984). However, the accuracy of these estimates is critically dependent on the actual abundances of B and Li concentrations in discrete alteration phases of basalt and vein minerals.…”

Section: Introductionmentioning

confidence: 99%

B, Li, and Associated Trace Element Chemistry of Alteration Minerals, Holes 597B and 597C

Berndt¹,

Seyfried²

1986

Initial Reports of the Deep Sea Drilling Project

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B, Li, and other trace elements were analyzed in samples from 12 celadonite and smectite-rich veins from oxidative and non-oxidative alteration zones in basalts from Holes 597B and 597C. The oxidative alteration zones are characterized by celadonite and Fe-oxyhydroxide and conspicuously high K, Rb, and B concentrations. In contrast, the non-oxidative alteration zones are characterized by Mg-rich smectite (saponite), talc, and calcite and high Li concentrations. Neither B nor Li reaches high concentrations in high-Al high-Ti veins that appear to have formed by replacement of basalt. B, Li, and Rb enrichments in vein assemblages of low-temperature origin reflect an important removal mechanism from seawater for these species.The alteration zones characterized by Mg-smectite and talc are strikingly enriched in Ni. There is a correlation between the Ni-enriched smectite and the presence of olivine in the host basalt; the correlation indicates that olivine alteration may be the source of the Ni. Other transition elements, including Cr, Mn, Co, Cu, and Zn, are often found in significant concentrations in the celadonite and high-Mg smectite veins, but their enrichments are neither as large nor as consistent as the enrichment of Ni in the Mg-smectite veins.Two high-Al, high-Ti vein assemblages of smectite and noncrystalline phases have transition element abundances similar to those of the host basalts but are relatively depleted in Cu and Cr. The material in these veins may have formed by replacement with concomitant release of Cu and Cr to circulating aqueous fluids.

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Mass balance of dissolved lithium in the oceans

Cited by 117 publications

References 49 publications

Lithium-isotope evidence for enhanced silicate weathering during OAE 1a (Early Aptian Selli event)

Lithium-isotope evidence for enhanced silicate weathering during OAE 1a (Early Aptian Selli event)

Lithium‐to‐calcium ratios in Modern, Cenozoic, and Paleozoic articulate brachiopod shells

B, Li, and Associated Trace Element Chemistry of Alteration Minerals, Holes 597B and 597C

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