Response of Mg isotopes to dolomitization during fluctuations in sea level: Constraints on the hydrological conditions of massive dolomitization systems

Hu, Zhongya; Bialik, Or M.; Hohl, Simon V.; Xia, Zhiguang; Waldmann, Nicolás; Liu, Chuan; Li, Weiqiang

doi:10.1016/j.sedgeo.2021.105922

Cited by 10 publications

(3 citation statements)

References 95 publications

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“…These values agree with previously published values (ImmenhauserTeng, 2017;Teng et al, 2015). For further details regarding the Mg isotope analysis, the reader is referred toImmenhauser et al (2010) andRiechelmann et al (2018).…”

supporting

confidence: 90%

“…Moreover, Mg is important in biological and hydrological systems given that it is a common element in plant material, seawater, groundwater, as well as dust and aerosols (Appelo & Postma, 2005; Black et al, 2008; Bolou‐Bi et al, 2010; Négrel & Roy, 1998; Sigg & Stumm, 2011). As a consequence, the number of studies focussing on the magnesium isotope composition (δ 26 Mg) of carbonate and silicate rocks, plants, river water, groundwater, seawater and biogenic shell material has rapidly increased over the last decades (Black et al, 2008; Geske et al, 2015; Hu et al, 2021; Kimmig et al, 2018; Li et al, 2019; Murray et al, 2021; Novak et al, 2020; Pogge von Strandmann et al, 2008; Riechelmann et al, 2012, 2016, 2018; Rollion‐Bard et al, 2016; Teng et al, 2010; Teng, 2017 and references therein; Tipper et al, 2006a; Wombacher et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Time series of δ²⁶Mg variability in precipitation of north‐west Germany

Riechelmann

Spötl

Immenhauser

2021

The Depositional Record

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supporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Time series of δ²⁶Mg variability in precipitation of north‐west Germany

Riechelmann

Spötl

Immenhauser

2021

The Depositional Record

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“…Land, 1998) represent the crux of the so‐called ‘dolomite problem’. This century‐old problem has manifested itself in the wide disagreement as to the timing, mechanisms, processes, environments and conditions involved in dolomite formation (Van Tuyl, 1916; Land, 1985, 1998; Sass & Bein, 1988; Sun, 1994; Budd, 1997; Arvidson & Mackenzie, 1999; Holland & Zimmermann, 2000; Warren, 2000; Machel, 2004; Hood et al ., 2011; Gregg et al ., 2015; Kaczmarek et al ., 2017; Petrash et al ., 2017; Chang et al ., 2020; Hu et al ., 2021; Li et al ., 2021; Manche & Kaczmarek, 2021; McCormick et al ., 2021; Fang & Xu, 2022).…”

Section: Introductionmentioning

confidence: 99%

Effects of sodium and potassium concentrations on dolomite formation rate, stoichiometry and crystallographic characteristics

et al. 2023

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This study uses high temperature (215°C) dolomitization experiments to explore the effects of sodium (Na) and potassium (K), two common constituents of natural fluids, on dolomite formation rate, stoichiometry and crystallographic characteristics. In these experiments, aragonite ooids were dolomitized in Mg–Ca–Cl solutions with either no additional salt, or in solutions containing NaCl or KCl at different concentrations. Results show that Na solutions, and to a lesser extent K solutions, correlate with faster reaction rates and that Na at hypersaline fluid concentrations produces dolomites with higher stoichiometry, higher micro‐strain and lower cation ordering. Potassium has a different effect on the dolomite than Na at similar concentrations. Unlike Na, K does not cause micro‐strain but leads to dolomite with smaller unit cell parameters. It is proposed that Na and K catalyse dolomite precipitation and increase stoichiometry by weakening Mg hydration bonds which consequently facilitates Mg incorporation into dolomite. The decrease in dolomite cation ordering at higher Na concentrations may stem from the incorporation of Na into dolomite which strains the crystal lattice and reduces cation order. On the basis that high‐temperature experiments are applicable to natural dolomites, several implications pertinent to natural dolomites are drawn from the results. Firstly, the data suggest that the higher concentrations of Na and K in evaporative fluids (i.e. higher salinity) can explain why dolomite is generally more abundant and more stoichiometric in evaporative settings. Secondly, the results challenge a key prediction of the mixing zone dolomitization model by showing that higher Na and K concentrations increase, rather than decrease, both dolomitization rate and stoichiometry. Thirdly, the observed decrease in dolomite cation ordering with increasing Na and K concentrations implies that evaporative fluids would produce less stable dolomite that may be more prone to subsequent recrystallization and thus resetting of primary geochemical signatures.

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Facies-dependent early diagenesis and hydrothermal reworking in dolostones: a case study on upper Permian and lower Triassic in northeast Sichuan Basin

Liao

et al. 2021

Carbonates Evaporites

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Response of Mg isotopes to dolomitization during fluctuations in sea level: Constraints on the hydrological conditions of massive dolomitization systems

Cited by 10 publications

References 95 publications

Time series of δ²⁶Mg variability in precipitation of north‐west Germany

Time series of δ²⁶Mg variability in precipitation of north‐west Germany

Effects of sodium and potassium concentrations on dolomite formation rate, stoichiometry and crystallographic characteristics

Facies-dependent early diagenesis and hydrothermal reworking in dolostones: a case study on upper Permian and lower Triassic in northeast Sichuan Basin

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Response of Mg isotopes to dolomitization during fluctuations in sea level: Constraints on the hydrological conditions of massive dolomitization systems

Cited by 10 publications

References 95 publications

Time series of δ26Mg variability in precipitation of north‐west Germany

Time series of δ26Mg variability in precipitation of north‐west Germany

Effects of sodium and potassium concentrations on dolomite formation rate, stoichiometry and crystallographic characteristics

Facies-dependent early diagenesis and hydrothermal reworking in dolostones: a case study on upper Permian and lower Triassic in northeast Sichuan Basin

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Time series of δ²⁶Mg variability in precipitation of north‐west Germany

Time series of δ²⁶Mg variability in precipitation of north‐west Germany