Ar-40/Ar-39 geochronology studies of rocks in eastern Himalaya syntaxis
文献类型：期刊论文
| 作者 | Gong JunFeng1; Ji JanQing1; Chen JianJun1; Sang HaQing2; Li BaoLong1; Liu YiDuo2; Han BaoFu1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2008-10-01 |
| 卷号 | 24期号:10页码:2255-2272 |
| 关键词 | Eastern Himalaya Namjagbarwa Ar-40/Ar-39 geochronology |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Conventional Ar-40/Ar-39 geochronology studies have been done on 20 separate minerals in 13 samples which are from the Yarlung-Tsangpo River gorge, eastern Himalaya syntaxis. The Ar-40/Ar-39 geochronology data show that: (1) the values of (Ar-40/Ar-16), of all the minerals tested are close to 295. 5; (2) most plateau ages are accord with their respective inverse isochron ages within error range. Age statistics indicate that most Ar-40/Ar-39 ages are focused on 1.3Ma and 2.5Ma approximately, indicating that Namjagbarwa region has undergone two fast cooling-uplift events in middle Pliocene and early Pleistocene respectively. The samples are. collected from the northern to the southern parts of the gorge, they are from various altitude and belong to different tectonic units, and the petrogenesis and lithology of their protolith are different, but the Ar-40/Ar-39 ages of most minerals (including hornblende, biotite, muscovite and K-feldspar etc.) from various samples are similar, and the age of different minerals from a single sample are not distributed according to the value of the closure temperature to argon isotopic system. Therefore, it seems that the cooling rate of the rocks in Namjagbarwa region has being so fast since Pliocene that the cooling process to argon isotopic system of minerals from this area are apparently different from ones from slow cooling environment. The cooling rate of Namjagbarwa region has being 120 similar to 240 degrees C/Ma and so an uplift rate of 3. 4 similar to 6. 9 min/a since the latest 3Ma according to the data published in this paper. |
| WOS关键词 | NAMCHE-BARWA SYNTAXIS ; DIFFUSION ; EXHUMATION ; PRESSURE ; AR-40 |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000262520800007 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/69478]  |
| 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, Sch Earth & Space Sci, Lab Orogen Belts & Crustal Evoult, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithispher Evoult, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gong JunFeng,Ji JanQing,Chen JianJun,et al. Ar-40/Ar-39 geochronology studies of rocks in eastern Himalaya syntaxis[J]. ACTA PETROLOGICA SINICA,2008,24(10):2255-2272. |
| APA | Gong JunFeng.,Ji JanQing.,Chen JianJun.,Sang HaQing.,Li BaoLong.,...&Han BaoFu.(2008).Ar-40/Ar-39 geochronology studies of rocks in eastern Himalaya syntaxis.ACTA PETROLOGICA SINICA,24(10),2255-2272. |
| MLA | Gong JunFeng,et al."Ar-40/Ar-39 geochronology studies of rocks in eastern Himalaya syntaxis".ACTA PETROLOGICA SINICA 24.10(2008):2255-2272. |
入库方式： OAI收割
来源：地质与地球物理研究所
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