TEM investigation of dislocation microstructure of experimentally deformed silicate garnet

被引:21
作者
Cordier, P
Raterron, P
Wang, Y
机构
[1] SUNY STONY BROOK,DEPT EARTH & SPACE SCI,STONY BROOK,NY 11794
[2] SUNY STONY BROOK,CTR HIGH PRESSURE RES,STONY BROOK,NY 11794
关键词
D O I
10.1016/0031-9201(96)03154-8
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Deformation experiments have been carried out on single crystals of garnet (Py25 Al67 Sp2 Gr6) under high confining pressure (P = 6.5 GPa) and temperature (T = 1440 degrees C) in a multi-anvil apparatus. The high pressure sample assembly was designed so as to generate high differential stress. In one experiment, the differential stress was limited by a single crystal of San Carlos olivine (oriented along [010]) added on top of the specimen. Garnet crystals have been plastically deformed which shows that under our experimental conditions, garnet is ductile. The dislocation microstructure, analysed by transmission electron microscopy (TEM), suggests that both 1/2[111]{110} and [100]{110} glide systems have been activated. Some dislocations appear to be dissociated. The observations of dislocation junctions and subgrain structures indicate that dislocation climb is enhanced under our experimental conditions.
引用
收藏
页码:121 / 131
页数:11
相关论文
共 28 条
[1]  
AINES RD, 1984, AM MINERAL, V69, P1116
[2]   DIRECT OBSERVATION OF DISSOCIATED DISLOCATIONS IN GARNET [J].
ALLEN, FM ;
SMITH, BK ;
BUSECK, PR .
SCIENCE, 1987, 238 (4834) :1695-1697
[3]   DISLOCATION MICROSTRUCTURES IN NATURALLY DEFORMED SILICATE GARNETS [J].
ANDO, J ;
FUJINO, K ;
TAKESHITA, T .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1993, 80 (3-4) :105-116
[4]   HIGH-TEMPERATURE CREEP OF OLIVINE SINGLE-CRYSTALS .1. MECHANICAL RESULTS FOR BUFFERED SAMPLES [J].
BAI, Q ;
MACKWELL, SJ ;
KOHLSTEDT, DL .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1991, 96 (B2) :2441-2463
[5]   FE-MG INTERDIFFUSION IN SINGLE-CRYSTAL OLIVINE AT VERY HIGH-PRESSURE AND CONTROLLED OXYGEN FUGACITY - TECHNOLOGICAL ADVANCES AND INITIAL DATA AT 7-GPA [J].
BERTRANALVAREZ, Y ;
JAOUL, O ;
LIEBERMANN, RC .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1992, 70 (1-2) :102-118
[6]   THE LARGE-VOLUME MULTI-ANVIL PRESS AS A HIGH P-T DEFORMATION APPARATUS [J].
BUSSOD, GY ;
KATSURA, T ;
RUBIE, DC .
PURE AND APPLIED GEOPHYSICS, 1993, 141 (2-4) :579-599
[7]   ANALYSIS OF PARTIAL AND STAIR-ROD DISLOCATIONS BY LARGE-ANGLE CONVERGENT-BEAM ELECTRON-DIFFRACTION [J].
CHERNS, D ;
MORNIROLI, JP .
ULTRAMICROSCOPY, 1994, 53 (02) :167-180
[8]  
CHERNS D, 1986, 11TH P INT C EL MICR, V1, P721
[9]   CHARACTERIZATION OF CRYSTAL DEFECTS IN QUARTZ BY LARGE-ANGLE CONVERGENT-BEAM ELECTRON-DIFFRACTION [J].
CORDIER, P ;
MORNIROLI, JP ;
CHERNS, D .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1995, 72 (05) :1421-1430
[10]   ULTRADEEP, ULTRAMAFIC MANTLE XENOLITHS - TRANSMISSION ELECTRON-MICROSCOPY PRELIMINARY-RESULTS [J].
DOUKHAN, N ;
SAUTTER, V ;
DOUKHAN, JC .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1994, 82 (3-4) :195-207