Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China
文献类型：期刊论文
| 作者 | Boven, A; Pasteels, P; Punzalan, LE; Liu, J; Luo, X; Zhang, W; Guo, Z; Hertogen, J |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2002 |
| 卷号 | 20期号:2页码:157-175 |
| ISSN号 | 1367-9120 |
| 文献子类 | Article |
| 英文摘要 | The biostratigraphically constrained Permo-Triassic Emeishan Volcanic Province (EVP), extending over wide areas in southwest China, has been recently considered as a Large Igneous Province contemporaneous with the Siberian Traps and the siliceous tuffs at the P-T boundary in South China. We report the first Ar-40/Ar-39 ages on this igneous province. Minimum ages have been obtained on phenocrystic plagioclase of the Emeishan basalt, which has undergone a pervasive metamorphism. most likely during subsequent tectonization as a consequence of terrane amalgamation. Comparison between the Ar-release spectra obtained on clear vs. cloudy plagioclase indicates a 40-30 Ma sericite resetting time. A minimum apparent age of 246 +/- 4 Ma for plagioclase from a plagiogranite, a late-differentiate of the Panzhihua Layered Complex, and an age of 254 +/- 5 Ma for phlogopite from a pyroxenite near Lake Erhai, provide the first absolute age constraint on this igneous province. Additional Ar-Ar age measurements on post-Emeishan alkaline and mafic magmatism yielded 104 +/- 2 and 100 +/- 2 Ma for an alkaline complex near Panzhihua. and 42 +/- 1 Ma for a gabbro sill emplaced near the Ertan Dam. Further study is still needed to determine the age of the Emeishan volcanic emission accurately. and to test the validity of the assumed short duration of the eruption. (C) 2002 Elsevier Science Ltd. All rights reserved. |
| WOS关键词 | 1985 TIBET GEOTRAVERSE ; FLOOD BASALTS ; PANXI RIFT ; BOUNDARY ; REMAGNETIZATION ; PALEOMAGNETISM ; ROCKS ; EXTINCTION ; MOUNTAINS ; SECTION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000172494300006 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77685]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Boven, A |
| 作者单位 | 1.Free Univ Brussels, Lab Geochronol, B-1050 Brussels, Belgium 2.Acad Sinica, Inst Geol, Beijing 100029, Peoples R China 3.Katholieke Univ Leuven, Afdeling Fysicochem Geol, B-3001 Louvain, Belgium |
| 推荐引用方式 GB/T 7714 | Boven, A,Pasteels, P,Punzalan, LE,et al. Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2002,20(2):157-175. |
| APA | Boven, A.,Pasteels, P.,Punzalan, LE.,Liu, J.,Luo, X.,...&Hertogen, J.(2002).Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China.JOURNAL OF ASIAN EARTH SCIENCES,20(2),157-175. |
| MLA | Boven, A,et al."Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China".JOURNAL OF ASIAN EARTH SCIENCES 20.2(2002):157-175. |
入库方式： OAI收割
来源：地质与地球物理研究所
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