Zr-in-rutile thermometry in eclogite at Jinheqiao in the Dabie orogen and its geochemical implications
文献类型：期刊论文
| 作者 | Chen ZhenYu1; Li QiuLi2 |
| 刊名 | CHINESE SCIENCE BULLETIN
 |
| 出版日期 | 2008-03-01 |
| 卷号 | 53期号:5页码:768-776 |
| 关键词 | rutile thermometer Jinheqiao eclogite differential diffusion and retrograde disequilibrium U-Pb age |
| ISSN号 | 1001-6538 |
| DOI | 10.1007/s11434-008-0006-1 |
| 文献子类 | Article |
| 英文摘要 | Trace element analysis was made by an electron microprobe on rutiles from ultrahigh-pressure eclogite at Jinheqiao in the Dabie orogen. The results show Zr contents of 37 to 118 mu g.g(-1), with significant variations between grains within the same thin section. Zr-in-rutile temperatures were calculated by the pressure-dependent thermometer, yielding 595 to 678 degrees C at 4.1 GPa for the upper limit of metamorphic pressures. The temperatures are about 200 to 250 degrees C lower than temperatures of 846 +/- 70 degrees C calculated from garnet-omphacite Fe-Mg partition geothermometry, but 150 to 200 degrees C higher than -460 degrees C from quartz-rutile O isotope temperatures and rutile Pb diffusion closure temperature for the same specimen. This indicates that the diffusion rate of Zr in rutile is remarkably slower than that of Pb and O in rutile, and that the temperature of Zr-in-rutile is higher than the closure temperature corresponding to cooling age as dated by rutile U-Pb radiometric system. The latter is consistent with experimental result of Zr diffusion in rutile. Diffusion and re-crystallization with intensive retrograde fluid during exhumation of UHP metamorphic rocks may be the major reason why the Zr contents in rutile decreased and thus did not provide the record of the peak metamorphic temperatures. The remarkable difference in Zr content between rutile grains suggests that the distribution of Zr in rutile was in the state of disequilibrium due to differential diffusion and retrograde resetting. |
| WOS关键词 | OXYGEN-ISOTOPE EQUILIBRIUM ; METAMORPHIC ROCKS ; TRACE-ELEMENTS ; EASTERN CHINA ; PB DIFFUSION ; SULU OROGEN ; SM-ND ; CONSTRAINTS ; MOUNTAINS ; TERRANE |
| WOS研究方向 | Science & Technology - Other Topics |
| 语种 | 英语 |
| WOS记录号 | WOS:000254402000021 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/69052]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Chen ZhenYu |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen ZhenYu,Li QiuLi. Zr-in-rutile thermometry in eclogite at Jinheqiao in the Dabie orogen and its geochemical implications[J]. CHINESE SCIENCE BULLETIN,2008,53(5):768-776. |
| APA | Chen ZhenYu,&Li QiuLi.(2008).Zr-in-rutile thermometry in eclogite at Jinheqiao in the Dabie orogen and its geochemical implications.CHINESE SCIENCE BULLETIN,53(5),768-776. |
| MLA | Chen ZhenYu,et al."Zr-in-rutile thermometry in eclogite at Jinheqiao in the Dabie orogen and its geochemical implications".CHINESE SCIENCE BULLETIN 53.5(2008):768-776. |
入库方式： OAI收割
来源：地质与地球物理研究所
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