Abiotic methane generation through reduction of serpentinite-hosted dolomite: Implications for carbon mobility in subduction zones

Peng, Weigang; Zhang, Lifei; Tumiati, Simone; Brovarone, Alberto Vitale; Hu, Han; Cai, Ya-Chun; Shen, Tingting

doi:10.1016/j.gca.2021.07.033

Cited by 25 publications

(9 citation statements)

References 129 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Abiotic CH 4 has increasingly been recognized in HP-UHP metamorphic rocks from subduction zones. CH 4 -rich fluid inclusions occur in high pressure-low temperature (HP-LT) ophicarbonates from the Western Alps [ 15 , 16 ], the Alpine Corsica [ 16 ] and the Western Tianshan [ 17 ]; in HP/UHP-LT eclogites from the Western Tianshan [25 and this study]; in metaperidotites from the Appalachian [ 42 ] and the North Qilian HP-LT metamorphic belt [ 43 ]; and in continental-type HP/UHP-MT eclogites (but solely in local reduced environments) [ 44 , 45 ]. From these examples it seems that cold subduction zones with HP/UHP-LT conditions favor the production of abiotic CH 4 .…”

Section: Discussionmentioning

confidence: 99%

“…Recent experiments have shown that abiotic CH 4 can be produced in the presence of aqueous fluids at 1.5–3.5 GPa and 300–700°C, P–T conditions that may occur in cold subduction zones [ 12–14 ]. Indeed, abiotic CH 4 has been discovered in fluid inclusions in metasomatized ultramafic ophicarbonates from the cold subduction zones in the Alps [ 15 , 16 ] and Western Tianshan [ 17 ], where it formed during serpentinization at forearc depths. However, the formation and pathways of abiotic CH 4 produced in mafic rocks, especially in eclogites, in natural subduction zones are still unknown.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Massive abiotic methane production in eclogite during cold subduction

Zhang

Tang

Wang

et al. 2022

National Science Review

Self Cite

View full text Add to dashboard Cite

Methane (CH4) is a critical but overlooked component in the study of deep carbon cycle. Abiotic CH4 produced by serpentinization of ultramafic rocks has received extensive attention, but its formation and flux in mafic rocks during subduction remain poorly understood. Here, we report massive CH4-rich fluid inclusions in well zoned garnet from ultrahigh-pressure (UHP) eclogites in the Western Tianshan, China. Petrological characteristics and carbon–hydrogen isotopic compositions confirm the abiotic origin of this CH4. Reconstructed P–T–fO2–fluid trajectories and Deep Earth Water modeling imply that massive abiotic CH4 was generated during prograde HP–UHP metamorphism at depths of 50–120 km, whereas CO2 was produced during exhumation. The massive production of abiotic CH4 in eclogites may result from multiple mechanisms during prograde HP-UHP metamorphism. Our flux calculation proposes that abiotic CH4 formed in HP-UHP eclogites in cold subduction zones may represent one of the largest, yet overlooked, sources of abiotic CH4 on Earth.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Massive abiotic methane production in eclogite during cold subduction

Zhang

Tang

Wang

et al. 2022

National Science Review

Self Cite

View full text Add to dashboard Cite

show abstract

“…Wang et al published a study on geological fluid describing the physical nonlinearity of fluid-rock classifications and the robust connection between flow and distortion in such equations, which run to absorbing predictions such as the extemporaneous development of fixated fluid flow in malleable stuns. Micro-thermometric findings for dolomite-hosted fluid inclusions are compatible with petrographic observations, indicating fluid entrapment prior to the commencement of dolomite reduction during exhumation, according to Peng et al Model calculations indicate that aqua-rich fluids with comparatively large hydrogen fugacity may generate promising conditions for the reduction process, but this does not rule out the potential of carbonate methanation by hydrogen-rich fluids. The search for renewable and unpolluted energy supplies is fueled by the rise in global energy demand.…”

Section: Introductionmentioning

confidence: 80%

Effectiveness of Nonuniform Heat Generation (Sink) and Thermal Characterization of a Carreau Fluid Flowing across a Nonlinear Elongating Cylinder: A Numerical Study

Hussain

Goud

Prakash³

et al. 2022

ACS Omega

View full text Add to dashboard Cite

During thermal radiation treatments, heat therapies, and examination procedures like scans and X-rays, the cylindrical blood vessels may get stretched; meanwhile, the blood flow through those blood vessels may get affected due to temperature variations around them. To overcome this issue, this work was framed to explore the impact of heat transmission in a Carreau fluid flow (CFF) through a stretching cylinder in terms of the nonlinear stretching rate and irregular heat source/sink. Temperature-dependent thermal conductivity and thermal radiation are taken into consideration in this study. To tranform complicated partial differential equations into ordinary differential equations, appropriate similarity variables are used. For a limited set of instances, the derived series solutions are compared to previously published results. For linear and nonlinear stretching rates, graphs and tables are used to examine the influence of an irregular heat source/sink on fluid movement and heat transfer. The research outcomes demonstrate that the heat source and nonlinear stretching rate cause a disruption in the temperature distribution in the fluid region, which can alter the blood flow through the vessels. In all conditions except for the heat in an internal heat sink, the nonlinear stretching situation improves the velocity and heat profile. Furthermore, with the increase in the values of the Weissenberg number, the temperature profile shows opposing features in a shear-thickening fluid and shear-thinning fluid. For the former n > 1, the blood fluidity gets affected, restricting the free movement of blood. For the latter, n < 1, the phenomenon is reversed. Other industrial applications of this work are wire coating, plastic coverings, paper fabrication, fiber whirling, etc. In all of those processes, the fluid flow is manipulated by thermal conditions.

show abstract

“…Thirdly, the formation of abiotic hydrocarbon during the reduction of subducting CaCO 3 has become a topic of great interest in recent years (Etiope and Sherwood Lollar, 2013;McCollom, 2016;Peng et al, 2021). The H 2 -bearing reductive fluids from the dehydration of hydrous silicates can react with CaCO 3 , forming methane and other hydrocarbons.…”

Section: Concluding Remarks and Perspectivesmentioning

confidence: 99%

Phase Stability and Reactions of Subducting CaCO₃ under Upper Mantle Conditions

Gui

Shen

Liu

2023

Acta Geologica Sinica (Eng)

View full text Add to dashboard Cite

CaCO 3 is an important component of marine sediments and one of the major deep-carbon carriers at subduction zones. Some subducted CaCO 3 can be dissolved in subduction fluids and recycled back to the surface via arc volcanoes degassing. At the same time, there still remain large amounts of CaCO 3 and its reaction products, which could be further transported into Earth's deep interior. These internal processes link atmosphere, hydrosphere and biosphere with the deep solid Earth, modifying the environments of our planet. In this review, we summarize current understanding from high pressure-temperature experiments and field petrological observations on the physical and chemical properties of CaCO 3 . In particular, the phase stability and reactions of CaCO 3 largely control the migration and reservation of oxidized carbon in subducting slabs. Finally, we present several critical but unsolved questions on CaCO 3 subducting in the deep mantle.

show abstract

Abiotic methane generation through reduction of serpentinite-hosted dolomite: Implications for carbon mobility in subduction zones

Cited by 25 publications

References 129 publications

Massive abiotic methane production in eclogite during cold subduction

Massive abiotic methane production in eclogite during cold subduction

Effectiveness of Nonuniform Heat Generation (Sink) and Thermal Characterization of a Carreau Fluid Flowing across a Nonlinear Elongating Cylinder: A Numerical Study

Phase Stability and Reactions of Subducting CaCO₃ under Upper Mantle Conditions

Contact Info

Product

Resources

About

Abiotic methane generation through reduction of serpentinite-hosted dolomite: Implications for carbon mobility in subduction zones

Cited by 25 publications

References 129 publications

Massive abiotic methane production in eclogite during cold subduction

Massive abiotic methane production in eclogite during cold subduction

Effectiveness of Nonuniform Heat Generation (Sink) and Thermal Characterization of a Carreau Fluid Flowing across a Nonlinear Elongating Cylinder: A Numerical Study

Phase Stability and Reactions of Subducting CaCO3 under Upper Mantle Conditions

Contact Info

Product

Resources

About

Phase Stability and Reactions of Subducting CaCO₃ under Upper Mantle Conditions