Laser Ar-40/Ar-39 isochron dating on Leizhou Quaternary volcanic rocks
文献类型：期刊论文
| 作者 | Li WeiRan1; Ji JianQing1; Sang HaiQing2; Zhou Jing1; Tu JiYao1; Sa Xiao3; Ye Heng1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-08-01 |
| 卷号 | 29期号:8页码:2775-2788 |
| 关键词 | Laser Ar-40/Ar-33 isochron dating Leizhou area Volcanic rocks |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Leizhou area is one of the most important distribution areas of Cenozoic volcanic rocks. Volcanic activities in this area concentrate in mid to late Pleistocene. Researchers dated Leizhou volcanic rocks mainly by K-Ar method and the results indicate the isotopic ages vary from 0.38Ma to 3.04Ma. However, according to the stratigraphic sequence, Leizhou Quaternary volcanic rocks overlie the layers of 1.87Ma and 0.76Ma. Therefore, the ages of volcanic rocks must be younger than the underlying layers, which indicates the error of ages dated by K-Ar method. This paper dates samples taken from Leizhou area by laser Ar-40/Ar-39 dating method. The results show that ages mainly center on 0.18Ma, indicating the eruptions occurred approximately 180000a ago. We can also infer that, to young samples, the isotopic ages dated by K-Ar method and apparent ages dated by(40)Ar/(39)Armethod are all older than the real ages. By comparison, isochron ages by Ar-40/Ar-39 method are more reliable. Furthermore, reliable ages calculated with phenocryst and matrix from the same sample (phenocryst-matrix isochron) must base on the fact that the phenocryst and matrix are congenetic. To determine whether they are congenetic or not, this paper proposes as the first time to compare the uniformity of initial Ar-36/Ar-38 value of samples before irradiated by neutron, thus testing the reliability of phenocryst-matrix isochron. Based on that, isochron dating method could be extended to all the other datings on congenetic and isochronic samples from the same district. |
| WOS关键词 | ALDER-CREEK ; K-AR ; INTERCALIBRATION ; AGES |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000323689100013 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/86826]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Li WeiRan |
| 作者单位 | 1.Peking Univ, Sch Earth & Space Sci, Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.China Univ Geosci, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li WeiRan,Ji JianQing,Sang HaiQing,et al. Laser Ar-40/Ar-39 isochron dating on Leizhou Quaternary volcanic rocks[J]. ACTA PETROLOGICA SINICA,2013,29(8):2775-2788. |
| APA | Li WeiRan.,Ji JianQing.,Sang HaiQing.,Zhou Jing.,Tu JiYao.,...&Ye Heng.(2013).Laser Ar-40/Ar-39 isochron dating on Leizhou Quaternary volcanic rocks.ACTA PETROLOGICA SINICA,29(8),2775-2788. |
| MLA | Li WeiRan,et al."Laser Ar-40/Ar-39 isochron dating on Leizhou Quaternary volcanic rocks".ACTA PETROLOGICA SINICA 29.8(2013):2775-2788. |
入库方式： OAI收割
来源：地质与地球物理研究所
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