| 大别山榴辉岩氢氧同位素组成及其地球动力学意义 |
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| 关键词:metamorphic P T condition oxygen isotopes eclogite Bixiling Dabie mountains |
| 基金项目:国家自然科学基金,中国科学院专项基金 |
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| 摘要: |
| Metamorphic PT and Oxygen Isotope Studies of Eclogites from Bixiling in the Dabie Mountains |
| A detailed petrographical study shows that eclogite from the Bixiling domain experienced at least five metamorphic stages:(1)pre_eclogite_facies metamorphism (EcP),(2)coesite eclogite_facies metamorphism(EcC),(3)recrystallized eclogite_facies metamorphism(EcR),(4)retrograde symplectite stage(Sym),and(5)retrograde amphibolite_facies stage(Am).Temperatures estimated based on oxygen isotope analyses of mineral pairs are in good concordance with temperatures derived from cation partition geothermometry and the petrographical study. This suggests that the oxygen isotopic equilibrium has been approached amongthe minerals within eclogite and that the retrograde metamorphism did not distort the isotopic equilibrium. The δ 18 O values of the eclogite are about 3～5‰,indicating a given water/rock interaction between the basaltic precurser of the eclogite and subsurface water prior to eclogitization. |
| XIAO Yi-lin,FU Bin,LI Shu-guang,ZHENG Yong-fei.1997.Metamorphic PT and Oxygen Isotope Studies of Eclogites from Bixiling in the Dabie Mountains[J].Acta Geoscientica Sinica,18(3):318-323. |
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