Ar-40-Ar-39 age spectra of garnet porphyroblast: Implications for metamorphic age of high-pressure granulite in the North China craton.
文献类型：期刊论文
| 作者 | Guo, JH; Wang, SS; Sang, HQ; Zhai, MG |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2001-07-01 |
| 卷号 | 17期号:3页码:436-442 |
| 关键词 | Ar-40-Ar-39 age metamorphic garnet high-pressure granulite North China craton |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Conventional step-heating Ar-40-Ar-39 spectra of metamorphic garnet separated from a high-pressure granulite sample yielded date of 1852 +/- 8Ma. The spectra included 76% Ar-39 released with Ar-40/Ar-36 ratio of 4376 similar to 10666. The six data in the age spectra defined an Ar-40-Ar-39 isochron which gives an age of 1862 +/- 37Ma. Its initial Ar-40/Ar-36 is 244, slightly lower than the atmospheric argon ratio. These ages are consistent with metamorphic age of the high-pressure granulite determined by Sm-Nd garnet + whole rock isochron and zircon U-Pb methods. The results revealed the potential of Ar-40-Ar-39 method for dating metamorphic garnet. Although pure metamorphic garnet contains only extremely low content of potassium, there is always some potassium in tiny mineral inclusions, fluid inclusions and lattice defect within garnet. As a good container, garnet protects these inclusions from later disturbance. Therefore, step-heating Ar-40-Ar-39 spectra are very useful to date metamorphic age of garnet as long as the retrograde metamorphism was not intensive. High-pressure granulites are widely Od distributed as enclaves and sheet like blocks in highly reworked TTG gneisses and migmatites in Sanggan area in the North China craton. They are considered to be generated during continental collision between eastern and western blocks in the North China craton. The metamorphic garnet Ar-40-Ar-39 ages presented here, together with other age determinations, indicate that the continental collision took place during late Paleoproterozoic. |
| WOS关键词 | HIGH-GRADE METAMORPHISM ; FLUID ; TEMPERATURE ; EVENTS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000170244300012 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/76539]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Guo, JH |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, JH,Wang, SS,Sang, HQ,et al. Ar-40-Ar-39 age spectra of garnet porphyroblast: Implications for metamorphic age of high-pressure granulite in the North China craton.[J]. ACTA PETROLOGICA SINICA,2001,17(3):436-442. |
| APA | Guo, JH,Wang, SS,Sang, HQ,&Zhai, MG.(2001).Ar-40-Ar-39 age spectra of garnet porphyroblast: Implications for metamorphic age of high-pressure granulite in the North China craton..ACTA PETROLOGICA SINICA,17(3),436-442. |
| MLA | Guo, JH,et al."Ar-40-Ar-39 age spectra of garnet porphyroblast: Implications for metamorphic age of high-pressure granulite in the North China craton.".ACTA PETROLOGICA SINICA 17.3(2001):436-442. |
入库方式： OAI收割
来源：地质与地球物理研究所
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