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  • 1
    Keywords: Rock deformation ; Geology, Structural ; Rock mechanics ; Aufsatzsammlung ; Gestein ; Deformation ; Deformationsverhalten ; Gefüge ; Rheologie ; Tektonik ; Strukturgeologie ; Deformation ; Kristallgitter ; Anisotropie
    Description / Table of Contents: This collection of papers presents recent advances in the study of deformation mechanisms and rheology and their applications to tectonics. Many of the contributions exploit new petrofabric techniques, particularly electron backscatter diffraction, to help understand evolution of rock microstructure and mechanical properties. Papers in the first section (lattice preferred orientations and anisotropy) show a growing emphasis on the determination of elastic properties from petrofabrics, from which acoustic properties can be computed for comparison with in-situ seismic measurements. Such research will underpin geodynamic interpretation of large-scale active tectonics. Contributions in the second section (microstructures, mechanisms and rheology) study the relations between microstructural evolution during deformation and mechanical properties. Many of the papers explore how different mechanisms compete and interact to control the evolution of grain size and petrofabrics. Contributors make use of combinations of laboratory experiments, field studies and computational methods, and several relate microstructural and mechanical evolution to large-scale tectonic processes observed in nature--
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (XI, 342 Seiten)
    ISBN: 9781862393387
    Series Statement: Geological Society special publication 360
    DDC: 551.8
    RVK:
    Language: English
    Note: Deformation mechanisms, rheology and tectonics: microstructures, mechanics and anisotropy: introduction , Constraints on the seismic properties of the middle and lower continental crust , Mica-controlled anisotropy within mid-to-upper crustal mylonites: an EBSD study of mica fabrics in the Alpine Fault Zone, New Zealand , From crystal to crustal: petrofabric-derived seismic modelling of regional tectonics , Deformation mechanisms of plagioclase and seismic anisotropy of the Acebuches metabasites (SW Iberian massif) , Seismic velocity in antigorite-bearing serpentinite mylonites , Obliteration of olivine crystallographic preferred orientation patterns in subduction-related antigorite-bearing mantle peridotite: an example from the Higashi-Akaishi body, SW Japan , Dissolution precipitation creep versus crystalline plasticity in high-pressure metamorphic serpentinites , Crystal fabric development and slip systems in a quartz mylonite: an approach via transmission electron microscopy and viscoplastic self-consistent modelling , Calculating anisotropic physical properties from texture data using the MTEX open-source package , The microstructural and rheological evolution of shear zones , Torsion experiments on coarse-grained dunite: implications for microstructural evolution when diffusion creep is suppressed , Characterization of microstructures and interpretation of flow mechanisms in naturally deformed, fine-grained anhydrite by means of EBSD analysis , Grain growth and the lifetime of diffusion creep deformation , Microstructures in deforming-reactive systems , Biases in three-diemensional vorticity analysis using porphyroclast system: limits and application to natural examples , Diffusion-creep modelling of fibrous pressure shadows II: influence of inclusion size and interface roughness , Rock mechanics constraints on mid-crustal low-viscosity flow beneath Tibet
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  • 2
    Publication Date: 2023-02-21
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 127(8), (2022): e2022JB024497, https://doi.org/10.1029/2022JB024497.
    Description: During plastic deformation, strain weakening can be achieved, in part, via strain energy reduction associated with intragranular boundary development and grain boundary formation. Grain boundaries (in 2D) are segments between triple junctions, that connect to encircle grains; every boundary segment in the encircling loop has a high (〉10°) misorientation angle. Intragranular boundaries terminate within grains or dissect grains, usually containing boundary segments with a low (〈10°) misorientation angle. We analyze electron backscatter diffraction (EBSD) data from ice deformed at −30°C (Th≈ 0.9). Misorientation and weighted Burgers vector (WBV) statistics are calculated along planar intragranular boundaries. Misorientation angles change markedly along each intragranular boundary, linking low- (〈10°) and high-angle (10–38°) segments that exhibit distinct misorientation axes and WBV directions. We suggest that these boundaries might be produced by the growth and intersection of individual intragranular boundary segments comprising dislocations with distinct slip systems. There is a fundamental difference between misorientation axis distributions of intragranular boundaries (misorientation axes mostly confined to ice basal plane) and grain boundaries (no preferred misorientation axis). These observations suggest during progressive subgrain rotation, intragranular boundaries remain crystallographically controlled up to large misorientation angles (〉〉10°). In contrast, the apparent lack of crystallographic control for grain boundaries suggests misorientation axes become randomized, likely due to the activation of additional mechanisms (such as grain boundary sliding) after grain boundary formation, linking boundary segments to encircle a grain. Our findings on ice intragranular boundary development and grain boundary formation may apply more broadly to other rock-forming minerals (e.g., olivine, quartz).
    Description: This work was supported by a NASA fund (Grant No. NNX15AM69G) to David L. Goldsby and two Marsden Funds of the Royal Society of New Zealand (Grant Nos. UOO1116, UOO052) to David J. Prior. Sheng Fan was supported by the University of Otago doctoral scholarship, the Antarctica New Zealand doctoral scholarship, a research grant from New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform (ANTA1801) (Grant No. ASP-023-03), and a New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant (Grant No. NZARI 2020-1-5). Open access publishing facilitated by University of Otago, as part of the Wiley – University of Otago agreement via the Council of Australian University Librarians.
    Keywords: High temperature deformation ; Misorientation ; Weighted Burgers vector ; Intragranular boundary ; Grain boundary ; Boundary geometry
    Repository Name: Woods Hole Open Access Server
    Type: Article
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