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学科主题: Geochemistry & Geophysics
题名: Strain softening and microstructural evolution of anorthite aggregates and quartz-anorthite layered composites deformed in torsion
作者: Ji, SC ; Jiang, ZT ; Rybacki, E ; Wirth, R ; Prior, D ; Xia, B
通讯作者: sji@polymtl.ca
关键词: anorthite ; quartz-anorthite composite ; simple shear ; crystallographic preferred orientation ; flow strength
刊名: EARTH AND PLANETARY SCIENCE LETTERS
发表日期: 2004
卷: 222, 期:2, 页:377-390
收录类别: sci
部门归属: Ecole Polytech, Dept Genies Civil Geol & Mines, Montreal, PQ H3C 3A7, Canada; Univ Liverpool, Dept Earth Sci, Liverpool L69 3BX, Merseyside, England; Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany; Chinese Acad Sci, Guangzhou Inst Geochem, Lab Marginal Sea Geol, Guangzhou, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou, Peoples R China
项目归属: 海洋地质
摘要: Torsion experiments of anorthite (An) aggregates and layered composites with equal volume fractions of quartz (Qtz) and An were performed in a gas-medium apparatus at a confining pressure of 400 MPa, temperatures from 1373 to 1473 K, and twist rates from 1.0 x 10(-4) to 3.0 x 10(-4) rad/s. Dense specimens were fabricated from An glass and Qtz crystalline powder using hot isostatic pressing (HIP) techniques. Both An aggregates and Qtz-An layered composites show a continuous strain weakening from a peak stress at gamma=0.2-0.3 to gamma=3.2, and steady-state flow has not reached under the experimental conditions. The weakening is even more pronounced in the layered composites than the monolithic aggregates, suggesting channeling or localization of flow into the weak material between strong layers. The sheared An specimens developed pervasively C-S-C' structures which are similar to those observed in natural ductile shear zones. TEM and electron backscattering diffraction (EBSD) fabric analyses suggest that grain boundary migration recrystallization-accommodated dislocation creep with (010)[100] as the dominant slip system was operating in the An. The strain softening may be due to the development of crystallographic preferred orientation (CPO), the operation of dynamic recrystallization and the formation of extremely fine-grained recrystallized material in the narrow C' shear bands. (C) 2004 Elsevier B.V All rights reserved.
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WOS记录号: WOS:000221993700004
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4802
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Ji, SC; Jiang, ZT; Rybacki, E; Wirth, R; Prior, D; Xia, B.Strain softening and microstructural evolution of anorthite aggregates and quartz-anorthite layered composites deformed in torsion,EARTH AND PLANETARY SCIENCE LETTERS,2004,222(2):377-390
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