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1、富铁橄榄石的高温变形实验研究1000-0569/2005/021(03)-0999-04ActaPetrologicaSinica岩石富铁橄榄石的高温变形15,l皿叉J赵永红ZimmermanMKohlstedtZha0YH一.ZimmermanMandK0hlstedtDL实验研究1.北京大学地球物押学系,北京1008712.明尼苏达大学地质j地球物系MN55455,美旧1.DepartmentofGeophysws,PekingUniversity,Beijing100871,Chimz2.DepartmentofGeologyandGeop
2、hysu,Universityo厂Minnesota,Minneapolis,MN55455,USA2005-01-01收稿.20057)2—25改回.ZhaoYH,ZimmermanMandKohlstedtDL.2005.Hightemperaturedeformationexperimentonironricholivine.ActaPetrologicaSinica,21(3):999—1004AbstractTriaxialcompressivecreepexperimentswereperformedonfine—grainedFer
3、icholivinesamplesof(Mgo5,Feo5)2SiO4and(Mgo7,Fe03)2SiO4.Firstly,thefayalite,Fe2SiO4,powderwassynthesizedinoneatmospherefurnacefromhigh—purityoxides.Then,the(Mgo5,Fe05)2SiO4and(Mgo7,Fe03)2SiO4sampleswerefabricatedfromamixtureofpowdersofSanCarlosolivine,(Mgo9,Feo1)2SiO4,andsynth
4、eticfayalite,Fe2SiO4.Samplesweredeformedinagas—mediumapparatusatatemperatureof1223～1473Kandaconfiningpressureof300MPa.Differentialstressesintherangefrom10to300MParesultedinstrainratesbetween10～～10一s～.Thesamplesweredeformedbothindiffusioncreepanddislocationcreepregimes.Fromthe
5、threedimensionalglobalnon—linearfittingofthetestdata,thestressexponentforFo50andFo70weredeterminedas4.1and4.3,respectively,andtheactivationenergyforFo5oandFo70as499kJ/moland510kJ/tool,respectively.TheseFo5osamplescreepatarateoverafactorof10fasterthansimilarsamplesofFo7()andFo
6、70samplescreepatarateoverafactorof10fasterthanthoseofFo),deformedunderthesameconditions.Therefore,thispapergivesapreliminarytestresultofeffectofironcontentontheviscosityofolivineaggregates.KeywordsFerichOlivine,Hightemperaturecreep,Threedimensionalcompression.Experimentalstud
7、y摘要利用高精度Paterson气体介质变形装置对(Mg.5,Fe):SiO和(Mgo,Fe.):SiO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Fe2SiO,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Fo和Fo三轴压缩蠕变变形试验在温度1223～1473K和围压300MPa的条件下进行,差应力为10～300MPa,应变率为10～10s,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,Fo应力指数为4.1,活化能为499kJ
8、/tool;Fo应力指数为4.3,活化能为510kJ/mol.将实验结果与Fo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
