A high precision U-Pb age of metamorphic rutile in coesite-bearing eclogite from the Dabie Mountains in central China: a new constraint on the cooling history
文献类型：期刊论文
| 作者 | Li, QL; Li, SG; Zheng, YF; Li, HM; Massonne, HJ; Wang, QC |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2003-10-30 |
| 卷号 | 200期号:3-4页码:255-265 |
| 关键词 | rutile coesite-bearing eclogite U-Pb dating cooling history closure temperature |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/S0009-2541(03)00194-3 |
| 文献子类 | Article |
| 英文摘要 | This paper first reports a high precision U-Pb age of 218 +/- 1.2 Ma for rutile in coesite-bearing eclogite from Jinheqiao in the Dabie Mounteins, east-central China. This work shows that the U-Pb mineral (rutile+omphacite) isochron age of 218 +/- 2.5 Ma and conventional rutile U-Pb concordia age of 218 +/- 1.2 Ma obtained by common Pb correction based on the Ph isotopic composition of omphacite in the same eclogite sample are consistent, proving that the omphacite with low U/Pb ratio (mu = 2.8) can be used for common Pb correction in U-Pb dating of rutile. Oxygen isotope analysis of rutile aliquots gave the consistent delta(18)O values of - 6.1 +/- 0.1%, demonstrating oxygen isotope homogenization in the rutile of different grains as inclusion in garnet and grain in matrix. Oxygen isotope thermometry yields temperatures of 695 +/- 35 and 460 +/- 15 degreesC for quartz-garnet and quartz-rutile pairs, respectively. These oxygen isotopic observations suggest that the diffusion of oxygen in rutile as inclusion in garnet is not controlled by garnet. According to field-based thermochronological studies of rutile, an estimate of the T-c of about 460 degreesC for U-Pb system in rutile under rapid cooling conditions ( similar to 20 degreesC/Ma) was advised. Based on this U-Pb age as well as the reported chronological data with their corresponding metamorphic and/or closure temperature, an improved T-t path has been constructed. The T-t path confirms that the UHPM rocks in South Dabie experienced a rapid cooling following the peak metamorphism before 220 Ma and a long isothermal stage from 213 to 180 Ma around 425 degreesC. (C) 2003 Elsevier B.V. All rights reserved. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; OXYGEN ISOTOPE FRACTIONATION ; EASTERN GRENVILLE PROVINCE ; MASSIVE SULFIDE DEPOSITS ; SM-ND ; RB-SR ; GOLD MINERALIZATION ; CLOSURE TEMPERATURE ; SUPERIOR PROVINCE ; ALTERATION HALOS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000185809200005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/78159]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Li, SG |
| 作者单位 | 1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China 2.Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China 3.Univ Stuttgart, Inst Mineral & Kristallchem, D-70174 Stuttgart, Germany 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, QL,Li, SG,Zheng, YF,et al. A high precision U-Pb age of metamorphic rutile in coesite-bearing eclogite from the Dabie Mountains in central China: a new constraint on the cooling history[J]. CHEMICAL GEOLOGY,2003,200(3-4):255-265. |
| APA | Li, QL,Li, SG,Zheng, YF,Li, HM,Massonne, HJ,&Wang, QC.(2003).A high precision U-Pb age of metamorphic rutile in coesite-bearing eclogite from the Dabie Mountains in central China: a new constraint on the cooling history.CHEMICAL GEOLOGY,200(3-4),255-265. |
| MLA | Li, QL,et al."A high precision U-Pb age of metamorphic rutile in coesite-bearing eclogite from the Dabie Mountains in central China: a new constraint on the cooling history".CHEMICAL GEOLOGY 200.3-4(2003):255-265. |
入库方式： OAI收割
来源：地质与地球物理研究所
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