| 大别-苏鲁造山带大理岩中榴辉岩包体的锆石U-Pb年龄及其地质意义 |
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| 关键词:marble fluid activity U-Pb age plate subduction plate exhumation |
| 基金项目:本文为国家自然科学基金项目（编号：40334036）资助成果。 |
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| Zircon U-Pb Dating of Marble-associated Eclogite in the Dabie-Sulu Orogenic Belt and Its Geological Implications |
| The fluid activity during subduction and exhumation, a very important problem with respect to timing and mechanism of metamorphic zircon growth, is elucidated in this paper by a combined study of zircon internal structure and U-Pb dating of UHP eclogite boudins enclosed in marbles from the Dabie-Sulu orogenic belt in eastern Central China. CL imaging has identified two types of zircon that are metamorphically new growth and recrystallized detrital grains, respectively. Both of them have low Th and U contents with low Th/U ratios, yielding two groups of 206Pb/238U age at 243±2 Ma and 225±3 Ma, respectively. Therefore, the formation of the first episode of metamorphic zircons is correlated with fluid activity during the progressive high-pressure (HP）ectogite-facies metamorphism. The growth of the second episode of metamorphic zircons may correspond to fluid activity during the retrograde HP eclogite-facies metamorphism. |
| WU Yuanbao,ZHENG Yongfei,GONG Bing.2005.Zircon U-Pb Dating of Marble-associated Eclogite in the Dabie-Sulu Orogenic Belt and Its Geological Implications[J].Acta Geoscientica Sinica,26(z1):118-120. |
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