A lithium-isotope perspective on the evolution of carbon and silicon cycles

Kalderon-Asael, Boriana; Katchinoff, Joachim; Planavsky, Noah J.; Hood, Ashleigh v.S.; Dellinger, Mathieu; Bellefroid, Éric; Jones, David S.; Hofmann, Axel; Ossa, Frantz Ossa; Macdonald, Francis A.; Wang, Chun‐Jiang; Isson, Terry T.; Murphy, Jack G.; Higgins, John A.; West, A. Joshua; Wallace, Malcolm W.; Asael, Dan; Strandmann, Philip A.E. Pogge von

doi:10.1038/s41586-021-03612-1

Cited by 65 publications

(43 citation statements)

References 49 publications

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“…The dataset includes δ 7 Li of speleothem records from two Israeli caves during the last glacial cycle (from the present to 200 ka) 53 , δ 7 Li of foraminifera samples from 8 ocean drill sites during the Cenozoic (60 Ma) 6 , δ 7 Li of 3 marine carbonate sections at the Eastbourne and South Ferriby, UK, and Raia del Pedale, southern Italy recording the Ocean Anoxic Event 2 (OAE2, ~93.5 Ma) 5 , δ 7 Li of 4 marine carbonate sections recording the Early Aptian OAE1a (~120 Ma) 63 , and the δ 7 Li of bulk carbonates and brachiopods from Anticosti Island, Canada (Pointe Laframboise) recording the Late Ordovician Hirnantian glaciation (~445 Ma) 68 . Carbonate-based Li isotope records spanning the past 3 billion years indicate that bulk carbonates can be used to faithfully reconstruct seawater Li isotope values in the deeper past 25 .…”

Section: Methodsmentioning

confidence: 99%

“…Past records of the seawater δ 7 Li are characterized by large excursions (by up to 15‰) over 10 6 year timescales 25 as well as gradual changes over 10 7 years 25 , such as occurred during the Cenozoic when δ 7 Li increased by ~9‰ 6 . Different interpretations exist for the Cenozoic δ 7 Li increase 6 , 24 , 26 , 27 , but most studies have interpreted it as reflecting a shift from more congruent continental weathering ~60 million years ago (typical of flat lowland settings) to more incongruent weathering in the present-day (typical of mountains), as a result of increased global denudation.…”

Section: Introductionmentioning

confidence: 99%

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Hydrological control of river and seawater lithium isotopes

et al. 2022

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Seawater lithium isotopes (δ7Li) record changes over Earth history, including a ∼9‰ increase during the Cenozoic interpreted as reflecting either a change in continental silicate weathering rate or weathering feedback strength, associated with tectonic uplift. However, mechanisms controlling the dissolved δ7Li remain debated. Here we report time-series δ7Li measurements from Tibetan and Pamir rivers, and combine them with published seasonal data, covering small (<102 km2) to large rivers (>106 km2). We find seasonal changes in δ7Li across all latitudes: dry seasons consistently have higher δ7Li than wet seasons, by −0.3‰ to 16.4‰ (mean 5.0 ± 2.5‰). A globally negative correlation between δ7Li and annual runoff reflects the hydrological intensity operating in catchments, regulating water residence time and δ7Li values. This hydrological control on δ7Li is consistent across climate events back to ~445 Ma. We propose that hydrological changes result in shifts in river δ7Li and urge reconsideration of its use to examine past weathering intensity and flux, opening a new window to reconstruct hydrological conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrological control of river and seawater lithium isotopes

et al. 2022

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“…Implications in geoscience can be developed as well. Indeed, 6 Li + enrichments (low δ 7 Li values) have been observed in marine biogenic carbonates, especially over the last 70 Ma period, and during short-term climatic or mass extinction events (Hathorne and James, 2006; Kalderon-Asael et al, 2021; Misra and Froelich, 2012; Pogge von Strandmann et al, 2019; Pogge von Strandmann et al, 2020; Washington et al, 2020). In vivo, CaCO 3 mineral precipitation in cells produces large amounts of H + ions that are eliminated in part by NHEs, which in turn enrich the precipitate in 6 Li + .…”

Section: Discussionmentioning

confidence: 99%

Biological fractionation of lithium isotopes by cellular Na⁺/H⁺ exchangers unravels fundamental transport mechanisms

Poët

Vigier

Bouret

et al. 2022

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Lithium (Li) has a wide range of uses in science, medicine and industry but its isotopy is underexplored, except in nuclear science and in geoscience. 6Li and 7Li isotopic ratio exhibits the second largest variation on Earth surface and constitutes a widely used tool for reconstructing past oceans and climates. As large variations have been measured in mammalian organs, plants or marine species, and as 6Li elicits stronger effects than natural Li (~95% 7Li) a central issue is the identification and quantification of biological influence of Li isotopes distribution. We show here that membrane ion channels and Na+-Li+/H+ exchangers (NHEs), strongly fractionate Li isotopes. This systematic 6Li enrichment is driven by membrane potential for channels, and by intracellular pH for NHEs, where it displays cooperativity, a hallmark of dimeric transport. Evidencing that transport proteins discriminate between isotopes differing by one neutron, opens new avenues for transport mechanisms, Li physiology, and paleoenvironments.

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“…Similarly, carb-out, carb-in, and sil-in represent dolomitization, carbonate weathering, and silicate weathering, respectively. By assuming that the Mg cycle is at a steady-state (such treatment had been universally applied in relevant studies such as Li 5,47 , Mg 8,13,48 , K 49,50 , Mo [51][52][53] , U [54][55][56][57] , we have:…”

Section: Sr Isotope Analysesmentioning

confidence: 99%

“…δ sili-out = δ sw + ∆ sil-out (5) With the equations 3, 4, and 5, we build a model that calculates how the Mg cycle evolves with the record of the Mg isotopic composition of seawater.…”

Section: Sr Isotope Analysesmentioning

confidence: 99%

The evolution of Earth’s surficial Mg cycle over the past 2 billion years

Xia

et al. 2022

Preprint

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The surficial cycling of Mg is directly coupled with the global carbon cycle, a predominant control of Earth’s climate. However, how Earth’s surficial Mg cycle evolved with time had been elusive. Magnesium isotope signatures of seawater (δ26Mgsw) track the surficial Mg cycle, which could provide crucial information on the carbon cycle in Earth’s history. Here, we present a reconstruction of δ26Mgsw evolution over the last 2 billion years using marine halite fluid inclusions and sedimentary dolostones. The two independent archives yield consistent evolutionary trends of δ26Mgsw for the past 430 million years, and the dolostone records extend the δ26Mgsw curve to 2 billion years ago. Modeling results of the net CO2 sequestration efficiency (EMg−CO2) by the surficial Mg cycle based on the δ26Mgsw record reveal a secular decline EMg−CO2 during the past 2 billion years, with the periods of low EMg−CO2 coinciding with ice ages in the Phanerozoic. Our work underlines a previously under-appreciated, but indispensable role of dolostones in regulating Earth’s climate on geologic time scales.

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A lithium-isotope perspective on the evolution of carbon and silicon cycles

Abstract: The evolution of the global carbon and silicon cycles are thought to have contributed to the long-term stability of the Earth's climate [1][2][3] . Many questions remain, however,

Cited by 65 publications

References 49 publications

Hydrological control of river and seawater lithium isotopes

Hydrological control of river and seawater lithium isotopes

Biological fractionation of lithium isotopes by cellular Na⁺/H⁺ exchangers unravels fundamental transport mechanisms

The evolution of Earth’s surficial Mg cycle over the past 2 billion years

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A lithium-isotope perspective on the evolution of carbon and silicon cycles

Abstract: The evolution of the global carbon and silicon cycles are thought to have contributed to the long-term stability of the Earth's climate [1][2][3] . Many questions remain, however,

Cited by 65 publications

References 49 publications

Hydrological control of river and seawater lithium isotopes

Hydrological control of river and seawater lithium isotopes

Biological fractionation of lithium isotopes by cellular Na+/H+ exchangers unravels fundamental transport mechanisms

The evolution of Earth’s surficial Mg cycle over the past 2 billion years

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Product

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About

Biological fractionation of lithium isotopes by cellular Na⁺/H⁺ exchangers unravels fundamental transport mechanisms