Ar-40/Ar-39 geochronology of high-pressure granulite xenolith and its surrounding granite in central Himalaya
文献类型：期刊论文
| 作者 | Gong JunFeng; Ji JianQing; Sang HaiQing; Han BaoFu; Li BaoLong; Chen JianJun |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2006-11-01 |
| 卷号 | 22期号:11页码:2677-2686 |
| 关键词 | Himalaya high-pressure granulite Ar-40/Ar-39 geochronology argon isotropic system |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | To make a further study of geological evolution history of Himalaya structure zone, and to study the isotopic system, which is an important foundation of isotopic geochronology in high pressure metamorphism, conventional Ar-40/Ar-39 geochronological research of peak and retrograde minerals in high-pressure granulite xenolith and potassium-rich minerals of its surrounding granite in central Himalaya have been done. In the surrounding granite, the biotite have a plateau age of 11.48 +/- 0.18 Ma and an isochron age of 11.63 Ma, while the K-feldspar have a plateau age of 12.63 +/- 0.19Ma and an isochron age of 12.58Ma. In the HP-granuhte xenolith, the peak metamorphic biotite, whose plateau age and isochron age are respectively 48.5 +/- 0.54Ma and 48.95 +/- 0.83Ma, together with its initial Ar-40/Ar-36 value of 285, shows that there is no extra Ar-40 in it. The retrograde hornblende has an isochron age of 31.1 +/- 5.4Ma, but have a saddle-shaped age spectrum and an initia Ar-40/Ar-36 value of 394, showing the obvious existence of extra Ar-40. Following former research, it is presumed that the high-pressure granulite xenolith had undergone a rapid retrograde metamorphism, both the metamorphism and the exchange of argon isotope in various minerals of different phases are non-equilibrium, where both ill rock samples and between the high-pressure granulite xenolith and its surrounding granite. It is certain that the argon isotopic system among peak and retrograde minerals are various according to the 4"Ar/'9Ar geochronological data, which is useful in dating geological events. Based on the Ar-40/Ar-39 geochronological data, a likely formational and evolutional geodynamic process of the high-pressure granulite xenolith in central Himalaya can be recoveried: The HP-granulite xenolith have undergone two respective metamorphism, the peak metamorphism was earlier than 48.5 Ma, while the retrograde metamorphism was at around 31 Ma ago, then have been caught by its surrounding granite at around 17 Ma ago, and brought to the earth's surface at about 11Ma similar to 12Ma ago. According to the Zircon U-Pb geochronological data, it is considered that the growth of metamorphie zircon might be restricted as a result of the lacking of melt or liquid under high-ultrahigh pressure metamorphic condition, which making it possible that the high-pressure metamorphic event not recorded by Zircon U-Pb age. |
| WOS关键词 | AR-40-AR-39 LASER PROBE ; EXCESS ARGON ; WESTERN ALPS ; K-FELDSPAR ; SESIA ZONE ; METAMORPHISM ; ECLOGITE ; SUBDUCTION ; PHENGITES ; ABLATION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000242929100006 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66886]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Gong JunFeng |
| 作者单位 | 1.Peking Univ, SESS, Lab Orogrn Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gong JunFeng,Ji JianQing,Sang HaiQing,et al. Ar-40/Ar-39 geochronology of high-pressure granulite xenolith and its surrounding granite in central Himalaya[J]. ACTA PETROLOGICA SINICA,2006,22(11):2677-2686. |
| APA | Gong JunFeng,Ji JianQing,Sang HaiQing,Han BaoFu,Li BaoLong,&Chen JianJun.(2006).Ar-40/Ar-39 geochronology of high-pressure granulite xenolith and its surrounding granite in central Himalaya.ACTA PETROLOGICA SINICA,22(11),2677-2686. |
| MLA | Gong JunFeng,et al."Ar-40/Ar-39 geochronology of high-pressure granulite xenolith and its surrounding granite in central Himalaya".ACTA PETROLOGICA SINICA 22.11(2006):2677-2686. |
入库方式： OAI收割
来源：地质与地球物理研究所
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