辉绿岩脆-塑性变形转化的高温高压实验研究

金淑燕; 孙天泽; 徐实昆; 张培春

Volume 25 Issue 6

Jun. 2000

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Article Navigation > Earth Science > 2000 > 25(6): 565-572

Jin Shuyan, Sun Tianze, Xu Shikun, Zhang Peichun, 2000. AN HIGH-TEMPERATURE AND HIGH-PRESSURE EXPERIMENTAL STUDY OF CHANGES BETWEEN BRITTLE AND DUCTILE DEFORMATIONS IN DIABASE. Earth Science, 25(6): 565-572.

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AN HIGH-TEMPERATURE AND HIGH-PRESSURE EXPERIMENTAL STUDY OF CHANGES BETWEEN BRITTLE AND DUCTILE DEFORMATIONS IN DIABASE

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100101, China

Received Date: 2000-04-11
Publish Date: 2000-11-25

Abstract

Abstract

A series of experiments on the transfer between the brittle and ductile properties of the Maryland diabase was performed, with natural pyrophyllite as the medium for the pressure transfer, at the temperature ranging from 800 to 1 000 ℃, at the confining pressure ranging from 0.6 GPa to 1.0 GPa, and at the strain rate ranging from 10^-4 to 10^-5 s^-1. The experiment results show that the rock is deformed into typical brittle fractures at the strain rate ranging from 10^-4 to 10^-5 s^-1, at the confining pressure of 1.0 GPa, and at the temperature lower than 800 ℃. At the temperature higher than 1 000 ℃, the rock is deformed dominantly into the metastable creep. At the temperature ranging from 800 to 950 ℃, the deformation of the rock turns from the brittle fractures to the pseudo ductile flow. Therefore, the sensitive effect of the temperature change on the rock transfer between brittle and ductile properties is greater than that of the pressure change. The micro structural observation shows that the transfer between the brittle and ductile properties in the diabase is dominated by the conjugated ductile flow network in the form of the rarefaction and diffusion.
- diabase,
- brittle ductile transfer,
- lower crust rheology,
- high pressure and high temperature experiment

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References(20)

References

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