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• W2942686710 abstract "Reaction rim growth experiments provide insight into mass transport phenomena, which are important for metamorphic rock-forming processes and deformation mechanisms. We investigated the formation of enstatite single rims between quartz and forsterite and of enstatite-forsterite double rims between quartz and periclase using porous polycrystalline starting materials. About 3 wt% water was added, acting as a catalyst for reactions. Experiments of mainly 4 and 23 h duration were performed in a Paterson-type deformation apparatus at 1000 °C temperature, 400 MPa confining pressure and differential stresses between 0 and 46 MPa. The resulting reaction rim width varied between <1 μm and ≈ 23 μm, depending on duration and type of reaction product. At isostatic pressure conditions, our data indicate that rim growth is proportional to time, controlled by dissolution-precipitation at interfaces of interconnected fluid-filled pores. In contrast, under non-isostatic stress conditions the reaction rim thickness increases non-linearly with time, implying diffusion-controlled growth. The magnitude of differential stress has no systematic influence on the reaction rate. Microstructural observations suggest that deformation-induced reduction of interconnected porosity causes this change in rate-controlling mechanism. For a natural MgO-SiO2 system, the results infer that fast interface-controlled reaction in the presence of high amounts of water is easily suppressed by concurrent deformation." @default.
• W2942686710 created "2019-05-09" @default.
• W2942686710 creator A5033397749 @default.
• W2942686710 creator A5063694316 @default.
• W2942686710 date "2019-04-29" @default.
• W2942686710 modified "2023-09-24" @default.
• W2942686710 title "Influence of differential stress on the growth of wet enstatite and enstatite-forsterite reaction rims" @default.
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• W2942686710 doi "https://doi.org/10.1007/s00710-019-00667-x" @default.
• W2942686710 hasPublicationYear "2019" @default.
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