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- W3114253144 abstract "Abstract Syntectonic microstructural evolution is a well‐known phenomenon in the mantle and lower crust associated with two main processes: grain size reduction through dynamic recrystallization and development of crystallographic preferred orientation (CPO). However, the effects of annealing via static recrystallization on grain size and CPO have been largely overlooked. We investigated mantle annealing by analyzing a suite of kimberlite‐hosted garnet peridotite xenoliths from the Wyoming Craton. We focus on five xenoliths that show microstructures reflecting different degrees of recrystallization, with annealed grains characterized by distinctive faceted boundaries crosscutting surrounding, nonfaceted matrix grains. These textures are indicative of discontinuous static recrystallization (DiSRX). Electron backscatter diffraction analysis further demonstrates a ∼10°–20° misorientation between DiSRXed grains and the matrix grains, resulting in an overall weaker CPO. These characteristics are remarkably similar to microstructures observed in samples that were annealed after deformation in the laboratory. Measurements of the thermal conditions and water contents associated with the last equilibration of the xenoliths suggests that high homologous temperatures ( T / T m > 0.9) are necessary to induce DiSRX. We postulate that annealing through DiSRX occurs under high temperatures after a short episode of intense deformation (years to hundreds of years) with timescales for annealing estimated as weeks to years, significantly slower than the timescale of hours expected for a kimberlitic magma ascent. We conclude that microstructural transformation due to DiSRX will occur during transient heating events associated with mantle upwelling, plumes, and lithospheric thinning." @default.
- W3114253144 created "2021-01-05" @default.
- W3114253144 creator A5037031044 @default.
- W3114253144 creator A5045815357 @default.
- W3114253144 creator A5049516742 @default.
- W3114253144 creator A5052287151 @default.
- W3114253144 creator A5060121595 @default.
- W3114253144 creator A5067700429 @default.
- W3114253144 creator A5071848151 @default.
- W3114253144 date "2021-03-01" @default.
- W3114253144 modified "2023-10-03" @default.
- W3114253144 title "Microstructural Shift due to Post‐Deformation Annealing in the Upper Mantle" @default.
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