High-pressure experimental and thermodynamic constraints on the solubility of carbonates in subduction zone fluids

Lan, Chunyuan; Tao, Renbiao; Huang, Fang; Jiang, Runze; Zhang, Lifei

doi:10.1016/j.epsl.2023.117989

Cited by 18 publications

(7 citation statements)

References 45 publications

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“…Lan et al. (2023) suggested that 90%–96% of carbon can be recycled into the deep mantle through different decarbonation processes in subduction zones. The decoupling of Zn with O isotopes of carbonatites in the Wajilitag complex is consistent with the model of the deep subduction to the lower mantle with a phase transition of carbonate from magnesite to MgO/MgSiO 3 + C. This implies that at least part of the carbonates did enter the lower mantle, which were captured by the subsequent mantle plume and carried to the shallow mantle.…”

Section: Discussionmentioning

confidence: 99%

“…Dasgupta and Hirschmann (2010) suggested that ∼90% of Earth's carbon is stored in the deep mantle, with considerable volumes of previously released carbon returning to the mantle through deep subduction. However, models on the deep mantle carbon cycle remain contentious (Dasgupta & Hirschmann, 2007, 2010; Kelemen & Manning, 2015; Lan et al., 2023), including whether carbon can pass through the mantle transition zone and enter the lower mantle, the state of carbon in the deep mantle, and how carbon entrainment affects mantle melting. Large Igneous Provinces (LIPs), which represent large‐scale magmatic events of large volumes during a short duration (Bryan & Ernst, 2008), can release voluminous CO 2 and might be linked with some of the major mass extinction events (Cui & Kump, 2015; Jones et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

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Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Wei,

Zhang,

Cheng

et al. 2024

Geochem Geophys Geosyst

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Sedimentary carbonates are known to be carried into the deep mantle by subducted slabs, and studies on mantle‐derived magmas have attempted to trace the recycled carbonate in their mantle source. However, the final depth of storage of recycled carbonate and the role of recycled carbonate in the partial melting of mantle remain controversial. Peralkaline‐carbonatite suites are considered to have been derived from a carbonated mantle source and are windows to evaluate carbon in the mantle. In this study, we report the Zn isotopic compositions of a peralkaline‐carbonatite suite from the Tarim Large Igneous Province (Tarim LIP). The peralkaline‐carbonatite suite has heavier δ66Zn than normal mantle with δ66Zn of 0.34–0.40 ‰ for nephelinite, 0.35–0.47 ‰ for aillikite, 0.51–0.55 ‰ for nepheline syenite, 0.58–0.67 ‰ for calciocarbonatite and 0.38–0.56 ‰ for magnesiocarbonatite. The heavy Zn isotopic compositions of the peralkaline‐carbonatite suite in the Wajilitag complex suggest the incorporation of recycled carbonate‐bearing materials into the deep mantle. We infer that the calciocarbonatite was produced by the initial partial melting of subducted MgSiO3/MgO + C‐bearing carbonated eclogite, whereas the magnesiocarbonatite, aillikite, and nephelinite are considered as reacted melts between carbonated eclogite‐derived melts and peridotite. The heavy Zn isotopic compositions of the nepheline syenite are attributed to fractional crystallization from nephelinite magma in the magma reservoir. Our study highlights the incorporation of carbonated eclogite as an important agent of recycled carbon in the deep mantle and interactions between carbonated eclogite‐derived melts and peridotite lead to the complex lithological heterogeneities in the peralkaline‐carbonatite suite in Tarim LIP.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Wei,

Zhang,

Cheng

et al. 2024

Geochem Geophys Geosyst

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“…Carbonate dissolution in aqueous fluid was believed to be essential for the mobility of carbon (Ague & Nicolescu, 2014; Frezzotti et al., 2011; Kelemen & Manning, 2015), and experimental studies have shown the solubilities of CaCO 3 (e.g., calcite and aragonite) are greatly enhanced by pressure and dissolved NaCl (Facq et al., 2014, 2016; Newton & Manning, 2002). However, carbonate solubility in aqueous fluids decrease by more than two orders of magnitude as the carbonate minerals transform from Ca‐rich phases to Mg‐rich phases (Farsang et al., 2021; Lan et al., 2023). Decarbonation efficiency via carbonate dissolution is therefore significantly depressed at depths >60 km where dolomite and magnesite become stable (Molina & Poli, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…CaCO 3 (e.g., calcite and aragonite) are greatly enhanced by pressure and dissolved NaCl (Facq et al, 2014(Facq et al, , 2016Newton & Manning, 2002). However, carbonate solubility in aqueous fluids decrease by more than two orders of magnitude as the carbonate minerals transform from Ca-rich phases to Mg-rich phases (Farsang et al, 2021;Lan et al, 2023). Decarbonation efficiency via carbonate dissolution is therefore significantly depressed at depths >60 km where dolomite and magnesite become stable (Molina & Poli, 2000).…”

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confidence: 99%

Coupled Cycling of Carbon and Water in the Form of Hydrous Carbonatitic Liquids in the Subarc Region

Chen,

Keshav,

Peng

et al. 2023

JGR Solid Earth

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The melting behavior of subducted ophicarbonate is experimentally investigated under conditions relevant for slabs at subarc depths (2.5–6 GPa and 650–1000°C). Hydrous carbonatitic liquids appear between 900 and 950°C at 2.5 GPa, between 800 and 850°C at 4–5 GPa, and at ∼800°C over 6 GPa. Water significantly depresses the thermal stability of carbonate, which drives the formation of hydrous carbonatitic liquid at low temperatures realistic for most subduction zones. Ophicarbonate fully dehydrates prior to wet melting. From an experimental point of view, the melting of ophicarbonate is essentially equal to the fluid–present melting of magnesite–bearing wehrlite lithology (i.e., meta–ophicarbonate). In the natural subduction process, the melting of meta–ophicarbonate occurs only when external water is available assuming dehydration fluid by ophicarbonate has been efficiently expelled at shallower depths. In the framework of the previously constructed dehydration history of subducting slab, the flux melting of meta–ophicarbonate at the slab–mantle interface is examined to be feasible under majority of geothermal conditions, even in cold subduction zones. Thus, hydrous carbonatitic liquid acts as a pervasive agent to transfer carbon from the slab surface to the mantle wedge at shallow depths beneath arcs. In contrast, ophicarbonate within the slab–serpentinized mantle just undergoes dehydration, and the vast majority of carbon retained in these lithologies is likely transported deeper into the mantle.

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“…Prograde metamorphism of subducting slabs yields large quantities of H 2 O through a series of continuous or discontinuous dehydration reactions at forearc and subarc depths (Schmidt & Poli, 2014). The generated H 2 O, or aqueous fluids, may infiltrate into nearby carbonated rocks and induce CO 2 migration from carbonate minerals into mobile fluids or liquids through metamorphic decarbonation (Arzilli et al., 2023; Stewart & Ague, 2018, 2020), dissolution in fluids (Ague & Nicolescu, 2014; Brovarone et al., 2020; Farsang et al., 2021; Frezzotti et al., 2011; Gorman et al., 2006; Lan et al., 2023; Menzel et al., 2020; Tian et al., 2019; Tumiati et al., 2017), or partial melting (Eguchi & Dasgupta, 2022; Grassi & Schmidt, 2011; Martin & Hermann, 2018; Poli, 2015) under typical slab geotherms. Therefore, the involvement of H 2 O is essential for removing slab‐trapped carbon at forearc to subarc depths, where dehydration reactions are believed to be a primary source of water for mobilizing slab‐derived major and trace elements (e.g., Kessel et al., 2005; Plank et al., 2009; Schmidt & Poli, 2014).…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Released From Subducted Oceanic Crust by Hydrous Carbonatitic Liquids

Zhang,

Wang,

et al. 2023

Geophysical Research Letters

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Aqueous fluids are essential to extract slab‐trapped carbon at forearc to subarc depths and interpret the decarbonation efficiency of global subduction zones. A large amount of carbon survives beyond subarc depths. The behavior of such carbon, however, remains unclear owing to a lack of experimental studies. Here, we investigate the decarbonation behavior of carbonated oceanic crust containing different amounts of H2O at pressures from subarc depths to the top of the mantle transition zone. We find that calcium‐rich carbonatitic liquids can form at temperatures of ∼950–1,150°C at depths below ∼150–300 km, corresponding to warm/cold thermal regimes in most subduction zones. Therefore, hydrous carbonatitic liquids should be pervasive in subduction zones, while extensive dehydration reactions and fluid activities are critical for creating carbonatitic liquids and preventing most of the surviving carbon from being subducted into the deep Earth.

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High-pressure experimental and thermodynamic constraints on the solubility of carbonates in subduction zone fluids

Cited by 18 publications

References 45 publications

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Coupled Cycling of Carbon and Water in the Form of Hydrous Carbonatitic Liquids in the Subarc Region

Carbon Dioxide Released From Subducted Oceanic Crust by Hydrous Carbonatitic Liquids

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