| 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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| 引用本文：肖益林,傅斌,李曙光,郑永飞.1997.大别山榴辉岩氢氧同位素组成及其地球动力学意义[J].地球学报,18(3):318-323. |
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| 摘要点击次数: 2488 |
| 全文下载次数: 1964 |
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| 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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| 中文摘要:碧溪岭榴辉岩石至少经历了５个阶段的变质作用，矿物对氧同位素地质测温结果与通过岩石学方法计算的温度吻合得非常好，表明碧溪岭榴辉岩体中大部分同位素体系接近或达到平衡，且退变质作用未明显破坏这种平衡，榴辉岩全岩δ＾１８Ｏ为３‰～５‰指示其母岩玄武岩曾与地表水在变质作用之前发生过一定程度的交换作用。 |
| 中文关键词:变质温压 氧同位素 榴辉岩 碧溪岭 大别山 |
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| Metamorphic PT and Oxygen Isotope Studies of Eclogites from Bixiling in the Dabie Mountains |
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| Abstract: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. |
| keywords:metamorphic P T condition oxygen isotopes eclogite Bixiling Dabie mountains |
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