气候变化领域集成服务门户(CCPortal): Dynamic Recrystallization Can Produce Porosity in Shear Zones

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DOI	10.1029/2019GL086172
	Dynamic Recrystallization Can Produce Porosity in Shear Zones
	Gilgannon J.; Poulet T.; Berger A.; Barnhoorn A.; Herwegh M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:7
英文摘要	Creep cavities are increasingly recognized as an important syn-kinematic feature of shear zones, but much about this porosity needs investigation. Largely, observations of creep cavities are restricted to very fine grained mature ultramylonites, and it is unclear when they developed during deformation. Specifically, a question that needs testing is should grain size reduction during deformation produce creep cavities? To this end, we have reanalyzed the microstructure of a large shear strain laboratory experiment that captures grain size change by dynamic recrystallization during mylonitization. We find that the experiment does contain creep cavities. Using a combination of scanning electron microscopy and spatial point statistics, we show that creep cavities emerge with, and because of, subgrain rotation recrystallization during ultramylonite formation. As dynamic recrystallization is ubiquitous in natural shear zones, this observation has important implications for the interpretation of concepts such as the Goetze criterion, paleopiezometery, and phase mixing. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Creep; Creep testing; Grain size and shape; Porosity; Scanning electron microscopy; Shear strain; Fine grained; Grain-size reduction; Laboratory experiments; Mylonitization; Phase mixing; Spatial points; Subgrain rotation; Ultramylonite; Dynamic recrystallization; deformation; experimental study; grain size; microstructure; mylonite; porosity; recrystallization; shear strain; shear zone
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170504
作者单位	Institute of Geological Sciences, University of Bern, Bern, Switzerland; CSIRO Mineral Resources, Kensington, WA, Australia; School of Minerals and Energy Resources Engineering, UNSW, Sydney, NSW, Australia; Department of Geoscience and Engineering, Delft University of Technology, Delft, Netherlands
推荐引用方式 GB/T 7714	Gilgannon J.,Poulet T.,Berger A.,et al. Dynamic Recrystallization Can Produce Porosity in Shear Zones[J],2020,47(7).
APA	Gilgannon J.,Poulet T.,Berger A.,Barnhoorn A.,&Herwegh M..(2020).Dynamic Recrystallization Can Produce Porosity in Shear Zones.Geophysical Research Letters,47(7).
MLA	Gilgannon J.,et al."Dynamic Recrystallization Can Produce Porosity in Shear Zones".Geophysical Research Letters 47.7(2020).