气候变化领域集成服务门户(CCPortal): Crystallographic preferred orientations of plagioclase via grain boundary sliding in a lower-crustal anorthositic ultramylonite

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DOI	10.1007/s00531-019-01749-z
	Crystallographic preferred orientations of plagioclase via grain boundary sliding in a lower-crustal anorthositic ultramylonite
	Soda Y.; Harigane Y.; Kajimoto K.; Okudaira T.
发表日期	2019
ISSN	14373254
起始页码	2057
结束页码	2069
卷号	108 期号:6
英文摘要	To clarify the rheological properties and deformational mechanisms that operate within lower-crustal shear zones, we analyzed deformation microstructures and fabrics in plagioclase grains from high-strain regions of intrafolial drag folds of an anorthositic ultramylonite from Langøya, Vesterålen, northern Norway. These grains have developed weak crystallographic preferred orientations (CPOs). Other than deformation twinning, they do not show any indications of intracrystalline plasticity or dynamic recrystallization. In some domains of the drag fold, plagioclase CPOs are more distinct, but the majority of inferred slip systems are not consistent with the main slip systems in plagioclase. These suggest that neither dislocation creep nor dislocation-accommodated grain boundary sliding (GBS) produced the plagioclase CPOs but rather grain rotation via GBS along specific grain boundaries parallel or subparallel to crystallographic planes of (010), (100) or (110), which led to an alignment of the easy-slip grain boundaries in the flow direction that produced the observed CPO patterns. The anisotropy of dissolution and growth rates may have been responsible for the development of the specific grain boundaries. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Anorthositic mylonite; Crystallographic preferred orientation; Grain boundary sliding; Lower crust; Plagioclase
语种	英语
scopus关键词	anorthosite; crystallography; deformation mechanism; dislocation creep; lower crust; microstructure; mylonite; plagioclase; preferred orientation; rheology; Norway
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147796
作者单位	Department of Geosciences, Osaka City University, Osaka, 558-8585, Japan; Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8567, Japan
推荐引用方式 GB/T 7714	Soda Y.,Harigane Y.,Kajimoto K.,et al. Crystallographic preferred orientations of plagioclase via grain boundary sliding in a lower-crustal anorthositic ultramylonite[J],2019,108(6).
APA	Soda Y.,Harigane Y.,Kajimoto K.,&Okudaira T..(2019).Crystallographic preferred orientations of plagioclase via grain boundary sliding in a lower-crustal anorthositic ultramylonite.International Journal of Earth Sciences,108(6).
MLA	Soda Y.,et al."Crystallographic preferred orientations of plagioclase via grain boundary sliding in a lower-crustal anorthositic ultramylonite".International Journal of Earth Sciences 108.6(2019).