| 富铁橄榄石的高温变形实验研究 |
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| 引用本文： | 赵永红[,] Zimmerman M Kohlstedt D L.富铁橄榄石的高温变形实验研究[J].岩石学报,2005,21(3):999-1004. |
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| 作者姓名： | 赵永红[ ] Zimmerman M Kohlstedt D L |
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| 作者单位： | 1. 北京大学地球物理学系,北京,100871;明尼苏达大学地质与地球物理系,MN55455,美国
2. 明尼苏达大学地质与地球物理系,MN55455,美国 |
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| 基金项目： | 国家自然科学基金项目(10299040-1,40174028,40474035)资助 |
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| 摘 要： | 利用高精度Paterson气体介质变形装置对(Mg0.5,Fe0.5)2SiO4和(Mg0.7,Fe0.3)2SiO4橄榄石集合体进行了高温三轴压缩变形试验。首先用人工合成了纯铁橄榄石Fe2SiO4,然后用合成的纯铁橄榄石与天然圣卡罗橄榄石按一定比例混合烧结合成了含铁量分别为50％和30％的富铁橄榄石集合体Fo50和Fo70。三轴压缩蠕变变形试验在温度1223-1473 K和围压 300 MPa的条件下进行,差应力为10-300 MPa,应变率为10-7-10-4s-1,每个试件的最大变形量为20％．利用三维非线性方法对蠕变数据进行拟合,得出的流动律中,Fo50应力指数为4．1,活化能为499kJ／mol;Fo70应力指数为4．3,活化能为510kJ／ mol。将实验结果与Fo90圣卡罗橄榄石集合体的强度进行对比,发现含铁量的增加使橄榄石的强度明显下降,Fo50橄榄石集合体比Fo70的粘性低一个量级,Fo70比Fo90的粘性低一个量级。从而得到了含铁量对橄榄石的粘性(强度)影响的初步试验结果。
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| 关 键 词： | 富铁橄榄石 高温蠕变 三轴压缩 实验研究 |
| 文章编号： | 1000-0569/2005/021（03）-0999-04 |
| 收稿时间： | 01 1 2005 12:00AM |
| 修稿时间： | 2005-01-01 |
High temperature deformation experiment on iron rich olivine |
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| Zhao YongGong;Zimmerman;M;Kohlstedt;D;L.High temperature deformation experiment on iron rich olivine[J].Acta Petrologica Sinica,2005,21(3):999-1004. |
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| Authors: | Zhao YongGong;Zimmerman;M;Kohlstedt;D;L |
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| Abstract: | Triaxial compressive creep experiments were performed on fine-grained Fe rich olivine samples of(Mg0.5,Fe0.5)2SiO4 and (Mg0.7, Fe0.3)2 SiO4. Firstly, the fayalite, Fe2SiO4 , powder was synthesized in one atmosphere furnace from high-purity oxides. Then, the (Mg0.5, Fe0.5)2 SiO4 and (Mg0.7, Fe0.3)2 SiO4 samples were fabricated from a mixture of powders of San Carlos olivine, (Mg0.9,Fe0.1)2SiO4, and synthetic fayalite, Fe2SiO4. Samples were deformed in a gas-medium apparatus at a temperature of 1223 -1473 K and a confining pressure of 300 MPa. Differential stresses in the range from 10 to 300 MPa resulted in strain rates between 10-7- 10-4s-1 . The samples were deformed both in diffusion creep and dislocation creep regimes. From the three dimensional global non-linear fitting of the test data, the stress exponent for Fo50 and Fo70 were determined as 4. 1 and 4. 3, respectively, and the activation energy for Fo50 and Fo70 as 499kJ/mol and 510kJ/mol, respectively. These Fo50 samples creep at a rate over a factor of 10 faster than similar samples of Fo70 and Fo70 samples creep at a rate over a factor of 10 faster than those of Fo90, deformed under the same conditions. Therefore, this paper gives a preliminary test result of effect of iron content on the viscosity of olivine aggregates. |
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| Keywords: | Fe rich Olivine High temperature creep Three dimensional compression Experimental study |
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