Climate Change Data Portal
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). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。