Weathering-driven porosity generation in altered oceanic peridotites

Pujatti, Simone; Plümper, Oliver; Tutolo, Benjamin M.

doi:10.1016/j.epsl.2023.118006

Cited by 5 publications

(3 citation statements)

References 55 publications

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“…Overall, the analysis of pore morphology suggests that the irregular shapes of the pores within the serpentine mesh cores may be attributed to the underlying mineral formation process. Hence, this suggests that the creation of the observed porosity may not be through processes such as dissolution or cracking, which typically result in elongated channel-like pore structures (Hoefner and Fogler 1988;Yang et al 2020;Wang et al 2022;Pujatti et al 2023), but is more likely directly related to the inherent crystal form of the serpentine minerals themselves.…”

Section: Tracing the Development Of Mesh-core Serpentine Porosity Via...mentioning

confidence: 99%

“…Additionally, the porous network that is formed during serpentinization can serve as a conduit for subsequent low-temperature (< 150 °C) alteration processes, which may be vital for producing hydrogen and supporting subsurface microbial activity (Templeton and Ellison 2020 ). Therefore, it is crucial to differentiate between serpentinization-induced porosity generation and the pore space generated by low-temperature weathering (Jöns et al 2017 ; Pujatti et al 2023 ).…”

Section: Introductionmentioning

confidence: 99%

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Decoding the nanoscale porosity in serpentinites from multidimensional electron microscopy and discrete element modelling

Chogani,

Plümper

2023

Contrib Mineral Petrol

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Serpentinites, widespread in Earth's lithosphere, exhibit inherent nanoporosity that may significantly impact their geochemical behaviour. This study provides a comprehensive investigation into the characteristics, scale dependence, and potential implications of nanoporosity in lizardite-dominated serpentinites. Through a combination of multidimensional imaging techniques and molecular-dynamics-based discrete element modelling, we reveal that serpentinites function as nanoporous media with pore sizes predominantly less than 100 nm. Crystallographic relationships between olivine, serpentine, and nanoporosity are explored, indicating a lack of significant correlations. Instead, stochastic growth and random packing of serpentine grains within mesh cores may result in interconnected porosity. The analysis of pore morphology suggests that the irregular pore shapes align with the crystal form of serpentine minerals. Furthermore, the nanoporosity within brucite-rich layers at the serpentine-olivine interface is attributed to delamination along weak van der Waals planes, while pore formation within larger brucite domains likely results from low-temperature alteration processes. The fractal nature of the pore size distribution and the potential interconnectivity of porosity across different scales further support the presence of a pervasive nanoporous network within serpentinites. Confinement within these nanopores may introduce unique emergent properties, potentially influencing fluid transport, mineral solubility, and chemical reactions. As such, these processes may have profound implications for the geochemical evolution of serpentinites.

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Section: Tracing the Development Of Mesh-core Serpentine Porosity Via...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decoding the nanoscale porosity in serpentinites from multidimensional electron microscopy and discrete element modelling

Chogani,

Plümper

2023

Contrib Mineral Petrol

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“…The higher abundances of uranium in the upper ~200 mbsf (table S11) reflect its heterogeneous uptake into serpentinized peridotite during interaction with seawater near the seafloor (38)(39)(40). Such low-temperature interaction may cause dissolution of brucite, olivine, and in extreme cases, serpentine, leading to high rock porosity and removal of Mg, with simultaneous uptake of seawater sulfur, carbon, and uranium into the rocks, to extents that are potentially significant for global ocean fluxes (12,(41)(42)(43)(44). This is consistent with both serpentine and wholerock compositions of shallow samples recovered during IODP Expedition 357 (23,38), including their elevated uranium and scatter in Mg-Si-Al relationships (Fig.…”

Section: Lithologies Alteration Patterns Consistent With Predictions ...mentioning

confidence: 99%

A long section of serpentinized depleted mantle peridotite

Lissenberg,

McCaig,

Lang

et al. 2024

Science

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The upper mantle is critical for our understanding of terrestrial magmatism, crust formation, and element cycling between Earth’s solid interior, hydrosphere, atmosphere, and biosphere. Mantle composition and evolution have been primarily inferred by surface sampling and indirect methods. We recovered a long (1268-meter) section of serpentinized abyssal mantle peridotite interleaved with thin gabbroic intrusions. We find depleted compositions with notable variations in mantle mineralogy controlled by melt flow. Dunite zones have predominantly intermediate dips, in contrast to the originally steep mantle fabrics, indicative of oblique melt transport. Extensive hydrothermal fluid-rock interaction is recorded across the full depth of the core and is overprinted by oxidation in the upper 200 meters. Alteration patterns are consistent with vent fluid composition in the nearby Lost City hydrothermal field.

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