• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Deformation Mechanisms in Granodiorite at Effective Pressures to 100 MPa and Temperatures to Partial Melting
【24h】

Deformation Mechanisms in Granodiorite at Effective Pressures to 100 MPa and Temperatures to Partial Melting

机译：花岗闪长岩在有效压力为100 mpa时的变形机制和温度对部分熔化的影响

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Deformation mechanisms in room-dry and water-saturated specimens of Charcoal Granodiorite, shortened at 10 exp -4 s exp -1 , at effective pressures (Pe) to 100 MPa and temperatures to partial melting (less than or equal to 1050 exp 0 C) are documented with a view toward providing criteria to recognize and characterize the deformation for geological and engienering applications. Above 800 exp 0 C strength decreases dramatically at effective pressures greater than or equal to 50 MPa and water-weakening reduces strength an additional 30 to 40% at Pe = 100 MPa. Strains at failure are only 0.1 to 2.2% with macroscopic ductility (within this range) increasing as the effective pressures are increased and in wet versus dry tests. Shattering (multiple faulting) gives way to faulting along a single zone to failure without macroscopic faulting as ductility increases. Microscopically, cataclasis (extension microfracturing and thermal cracking with rigid-body motions) predominates at all conditions. Dislocation gliding contributes little to the strain. Precursive extension microfractures coalesce to produce the throughgoing faults with gouge zones exhibiting possible Riedel shears. Incipient melting, particularly in wet tests, produces a distinctive texture along feldspar grain boundaries that suggests a grain-boundary-softening effect contributes to the weakening. In addition, it is demonstrated that the presence of water does not lead to more microfractures, but to a reduction in the stresses required to initiate and propagate them. (ERA citation 08:013217)

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号