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Volume 15 Issue 2
Jun.  2004
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Formation Depth Estimation of Coesite~Bearing Eclogite in Dabie UHPM Zone, China: Constrained by Isotopic Studie

  • Received Date: 2004-02-01
  • Rev Recd Date: 2004-02-01
  • Publish Date: 2004-02-01
  • The formation depth of metamorphic rocks in the Dabie ultrahigh pressure metamorphic(UHPM) zone influences not only our understanding of formation mechanism and evolution processes of collision orogenic belt, but also the studies on earth's interior and geodynamic processes. In this study, the isotopic data of metamorphic rocks in the Dabie UHPM zone are discussed to give constraints on the formation depth in the Dabie UHPM zone. TheεSrof eclogite in the Dabie UHPM zone varies from 18 to 42, and the εNd/sub>varies from ~6.1 to~17, both of them show the characters of isotopic disequilibrium. The oxygen isotope studies indicate that the protoliths of these UHPM rocks have experienced oxygen isotope exchange with meteoric water (or sea water) before metamorphism and no significant changes in the processes of metamorphism on their oxygen isotope composition have been recorded in these rocks. Except for one sample from Bixiling, all samples of eclogite from Dabie UHPM zone show the 3He/ 4He rati
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通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Formation Depth Estimation of Coesite~Bearing Eclogite in Dabie UHPM Zone, China: Constrained by Isotopic Studie

Abstract: The formation depth of metamorphic rocks in the Dabie ultrahigh pressure metamorphic(UHPM) zone influences not only our understanding of formation mechanism and evolution processes of collision orogenic belt, but also the studies on earth's interior and geodynamic processes. In this study, the isotopic data of metamorphic rocks in the Dabie UHPM zone are discussed to give constraints on the formation depth in the Dabie UHPM zone. TheεSrof eclogite in the Dabie UHPM zone varies from 18 to 42, and the εNd/sub>varies from ~6.1 to~17, both of them show the characters of isotopic disequilibrium. The oxygen isotope studies indicate that the protoliths of these UHPM rocks have experienced oxygen isotope exchange with meteoric water (or sea water) before metamorphism and no significant changes in the processes of metamorphism on their oxygen isotope composition have been recorded in these rocks. Except for one sample from Bixiling, all samples of eclogite from Dabie UHPM zone show the 3He/ 4He rati

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