High-temperature creep of synthetic calcite aggregates: influence of Mn-content

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• 作者：Freund ; Dieter ; Wang ; Zichao ; Rybacki ; Erik ; Dresen ; Georg
• 关键词：deformation ; calcite aggregates ; impurity ; creep behavior
• 刊名：Earth and Planetary Science Letters
• 出版年：2004
• 出版时间：October 15, 2004
• 年：2004
• 卷：226
• 期：3-4
• 页码：433-448
• 全文大小：941 K

文摘

To investigate the role of impurities on the deformation of calcite rocks, we performed creep experiments on fine-grained synthetic calcite aggregates with varying Mn-content. The tests were performed in a uniaxial creep apparatus at temperatures of 700aaa830 aaC and stresses between 15 and 65 MPa, resulting in strain rates of 10^aaa7 to 10^aaa4 s^aaa1. Varying the oxygen fugacity, f_O2, between 10^aaa18 and 10^aaa4 MPa did not affect the creep strength. Applying a power law constitutive relationship on the creep data, two distinct creep regimes were observed, a low stress regime (<15 MPa) and a high stress regime (>20aaa25 MPa). In the low stress regime, a stress exponent n of 1.7aa0.3 and an activation energy of Q