全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

Hydroxyl induced eclogite fabric and deformation mechanism

Keywords: eclogite,hydroxyl,fabric,EBSD,CPO
榴辉岩
,变形机理,羟基,流变学,岩石,微观结构

Full-Text   Cite this paper   Add to My Lib

Abstract:

Eclogites from orogens often show strong plastic deformation and high hydroxyl content. We have studied the correlation between crystallographic preferred orientations of garnet and omphacite from natural eclogites with their hydroxyl contents using the electron back-scat- tered diffraction technique. The results show: 1) Omphacite has typical L-type or SL-type crystrallographic preferred orientations, that is, 001] is distributed in a girdle in the foliation plane with a maximum parallel to lineation; (010) is distributed in a girdle normal to the lineation with a maxi- mum parallel to the foliation plane, suggesting a shear dominant deformation regime. Omphacite fabrics do not vary significantly with hydroxyl content, although the hy- drous component may cause lower flow strength. 2) Hy- droxyl can influence significantly flow properties of garnet in eclogite. Garnets behave as rigid bodies under low tempera- ture and dry conditions. Grain boundary processes will dominate the deformation and lower the flow strength of garnet under high water fugacity conditions. Garnets show no crystallographic preferred orientation in both cases. These results may have important implications for a better understanding of deformation mechanisms and associated fluid activities during deep subduction and exhumation processes.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133