%0 Journal Article
%T High temperature deformation experiment on iron rich olivine<br>富铁橄榄石的高温变形实验研究
%A Zhao YongGong
%A Zimmerman
%A M
%A Kohlstedt
%A DL
%A <br>赵永红[
%A ] Zimmerman M Kohlstedt D L
%J 岩石学报
%D 2005
%I 
%X 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.
%K Fe rich Olivine
%K High temperature creep
%K Three dimensional compression
%K Experimental study<br>富铁橄榄石
%K 高温蠕变
%K 三轴压缩
%K 实验研究
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=6F79A4B904B25377&yid=2DD7160C83D0ACED&vid=659D3B06EBF534A7&iid=38B194292C032A66&sid=E6D5A068841F33F3&eid=F0CB1CC137DFCF2D&journal_id=1000-0569&journal_name=岩石学报&referenced_num=3&reference_num=21