Lithium and its isotopes in major world rivers: implications for weathering and the oceanic budget

Huh, Youngsook; Chan, Lui-Heung; Zhang, Libo; Edmond, John M.

doi:10.1016/s0016-7037(98)00126-4

Cited by 388 publications

(320 citation statements)

References 46 publications

Supporting

Mentioning

294

Contrasting

Unclassified

Order By: Relevance

“…enhanced secondary mineral formation should decrease [Li] and increase  7 Li), during fluvial transport Li may also be desorbed/dissolved from previously formed secondary minerals. In this study we consider riverine [Li] and its isotopic ratio as independent parameters: an approach that is in agreement with studies on modern river catchments (Bouchez et al, 2013;Dellinger et al, 2015;Huh et al, 1998;Li & West 2014, supplementary material;Liu et al, 2015;Millot et al, 2010;Pogge von Strandmann & Henderson, 2015;Wanner et al, 2014) that do not show any, or at least a non-linear, relationship between [Li] and  7 Li. This independence of riverine [Li] and its isotopic ratio is probably caused by the varied combination of processes acting on the course of the river in different parts of the catchment, where different weathering regimes prevail.…”

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

confidence: 62%

“…R sink is defined by ∆ sink = R sink − R SW with ∆ 7 Li sink = 15 − 16‰ (Chan et al, 1993;Huh et al, 1998;Misra & Froelich, 2012). The calculation of the sink of Li is based on the assumption that partitioning of…”

Section: Methods and Experimental Set-upmentioning

confidence: 99%

“…During the weathering processes, clay minerals are formed that preferentially incorporate the light 6 Li, leaving an isotopically heavy solution behind (e.g. Dellinger et al, 2015;Huh et al, 2001Huh et al, , 1998Kisakürek et al, 2005;Pogge von Strandmann et al, 2010, 2006Vigier et al, 2009). As a result, the riverine lithium isotopic ratio carries the combined signal of secondary mineral formation, which contributes solutions with relatively high  7 Li and low [Li] (incongruent weathering), and primary silicate dissolution, which contributes solutions with a relatively low  7 Li and high [Li] (congruent weathering, where river  7 Li equals rock  7 Li).…”

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

confidence: 99%

“…Hence, the  7 Li of rivers is controlled by the ratio of primary mineral dissolution to secondary mineral formation, which can be defined as the weathering congruency or intensity (Dellinger et al, 2015;Kisakürek et al, 2005;Liu et al, 2015;Misra & Froelich, 2012;Pogge von Strandmann et al, 2013. The global mean riverine  7 Li today is about 23‰ (Huh et al, 1998) with values extending between 1.2 and 43% (Dellinger et al, 2015;Huh et al, 2001;Kisakurek et al, 2005;Lemarchand et al, 2010;Liu et al, 2015;Pogge von Strandmann & Henderson, 2015;Pogge von Strandmann et al, 2010, 2006Vigier et al, 2009).…”

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

confidence: 99%

“…Dellinger Huh et al, 1998;Millot et al, 2010), and suggested for some case histories from the geological record (Li & West, 2014;Wanner et al, 2014), makes it possible to model the observed features, whereas changing the residence times of Os, Sr and Ca do not change the main signal (Fig. 6).…”

mentioning

confidence: 98%

See 4 more Smart Citations

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

113

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 62%

Section: Methods and Experimental Set-upmentioning

confidence: 99%

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

confidence: 99%

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

confidence: 99%

mentioning

confidence: 98%

See 3 more Smart Citations

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

113

View full text Add to dashboard Cite

show abstract

Tracking the weathering of basalts on Mars using lithium isotope fractionation models

Fairén

Losa-Adams

Gil-Lozano

et al. 2015

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Lithium (Li), the lightest of the alkali elements, has geochemical properties that include high aqueous solubility (Li is the most fluid mobile element) and high relative abundance in basalt‐forming minerals (values ranking between 0.2 and 12 ppm). Li isotopes are particularly subject to fractionation because the two stable isotopes of lithium—7Li and 6Li—have a large relative mass difference (∼15%) that results in significant fractionation between water and solid phases. The extent of Li isotope fractionation during aqueous alteration of basalt depends on the dissolution rate of primary minerals—the source of Li—and on the precipitation kinetics, leading to formation of secondary phases. Consequently, a detailed analysis of Li isotopic ratios in both solution and secondary mineral lattices could provide clues about past Martian weathering conditions, including weathering extent, temperature, pH, supersaturation, and evaporation rate of the initial solutions in contact with basalt rocks. In this paper, we discuss ways in which Martian aqueous processes could have lead to Li isotope fractionation. We show that Li isotopic data obtained by future exploration of Mars could be relevant to highlighting different processes of Li isotopic fractionation in the past, and therefore to understanding basalt weathering and environmental conditions early in the planet's history.

show abstract

Lithium isotopic systematics of submarine vent fluids from arc and back‐arc hydrothermal systems in the western Pacific

Araoka

Nishio

Gamo

et al. 2016

Geochem Geophys Geosyst

View full text Add to dashboard Cite

The Li concentration and isotopic composition (d 7 Li) in submarine vent fluids are important for oceanic Li budget and potentially useful for investigating hydrothermal systems deep under the seafloor because hydrothermal vent fluids are highly enriched in Li relative to seawater. Although Li isotopic geochemistry has been studied at mid-ocean-ridge (MOR) hydrothermal sites, in arc and back-arc settings Li isotopic composition has not been systematically investigated. Here we determined the d 7 Li and 87 Sr/ 86 Sr values of 11 end-member fluids from 5 arc and back-arc hydrothermal systems in the western Pacific and examined Li behavior during high-temperature water-rock interactions in different geological settings. In sediment-starved hydrothermal systems (Manus Basin, Izu-Bonin Arc, Mariana Trough, and North Fiji Basin), the Li concentrations (0.23-1.30 mmol/kg) and d 7 Li values (14.3& to 17.2&) of the end-member fluids are explained mainly by dissolution-precipitation model during high-temperature seawater-rock interactions at steady state. Low Li concentrations are attributable to temperature-related apportioning of Li in rock into the fluid phase and phase separation process. Small variation in Li among MOR sites is probably caused by low-temperature alteration process by diffusive hydrothermal fluids under the seafloor. In contrast, the highest Li concentrations (3.40-5.98 mmol/kg) and lowest d 7 Li values (11.6& to 12.4&) of end-member fluids from the Okinawa Trough demonstrate that the Li is predominantly derived from marine sediments. The variation of Li in sediment-hosted sites can be explained by the differences in degree of hydrothermal fluid-sediment interactions associated with the thickness of the marine sediment overlying these hydrothermal sites. Key Points:First Li isotopic report on submarine vent fluids from arc and back-arc hydrothermal systems Li in vent fluids can be explained mainly by dissolution-precipitation model during seawater-rock and seawater-sediment interactions Variation in Li due to diffusive hydrothermal fluid and the degree of hydrothermal fluid-sediment interaction

show abstract

Lithium and its isotopes in major world rivers: implications for weathering and the oceanic budget

Cited by 388 publications

References 46 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)

Tracking the weathering of basalts on Mars using lithium isotope fractionation models

Lithium isotopic systematics of submarine vent fluids from arc and back‐arc hydrothermal systems in the western Pacific

Contact Info

Product

Resources

About