On the mechanism of remagnetization of Ordovician carbonates from the Yangtze Block, southwestern China
文献类型：期刊论文
| 作者 | Liu Cheng-Ying1,2; Li Shi-Hu1,2; Deng Cheng-Long1; Zhu Ri-Xiang1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2013-02-01 |
| 卷号 | 56期号:2页码:579-591 |
| 关键词 | Yangtze Block Ordovician Carbonates Magnetite Pyrrhotite Remagnetization Chemical remanent magnetization |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg20130221 |
| 文献子类 | Article |
| 英文摘要 | Carbonates are an important source of paleomagnetic field records. However, widespread remagnetization phenomena have questioned the reliability of the paleomagnetic results from carbonates, where the ultimate cause of the remagnetization remains controversial. In this study we investigated the remagnetization mechanism of the Ordovician carbonates from the Yangdeng (YD) area in the Yangtze Block, Guizhou province. The results show that the majority of samples (94%) are dominated by a unique magnetic component (A) up to 400 degrees C or 450 degrees C, generating a mean geographic direction of Dg/Ig=3.1 degrees/48.1 degrees (alpha(95)=2.9 degrees). The corresponding geomagnetic pole is 87.0 degrees N, 2.8 degrees E ( A(95) = 3.0 degrees), which coincides with the Quaternary-Eocene pole of the Yangtze block, indicating that these samples were remagnetized sometime since Eocene. The other minority of samples have two magnetic components: one is the low temperature component (<450 degrees C), coinciding with the A components; the other is the high temperature component (450 degrees C similar to 585 degrees C), which is significantly different from the A component and departs from the early Paleozoic poles of the Yangtze Block. This indicates the YD carbonates recorded two periods of remagnetization. Combining the paleomagnetic results with rock magnetic investigations suggests that the remagnetization is due to the acquisition of a chemical remanent magnetization (CRM) carried by authigenic magnetite and pyrrhotite, possibly together with greigite. The authigenic processes of these minerals are probably influenced by the orogenic fluid resulted from the Yanshanian orogeny in late Cretaceous and Himalaya orogeny in late Eocene, respectively. The influence from the latter one is dominantly recorded in this study. Sedimentary rocks on the southeastern edge of the Tibetan plateau, such as carbonates in this study, are prone to interaction with the orogenic fluids during migration, which promotes the authigenic processes that lead to the significant remagnetization. |
| WOS关键词 | EARLY PALEOZOIC ROCKS ; PALEOMAGNETIC CONSTRAINTS ; TECTONIC IMPLICATIONS ; NORTH-AMERICA ; SOUTH CHINA ; MAJOR BLOCKS ; FOLD TEST ; RED BEDS ; PYRITE ; MAGNETITE |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000315762400021 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/87862]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Liu Cheng-Ying |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Cheng-Ying,Li Shi-Hu,Deng Cheng-Long,et al. On the mechanism of remagnetization of Ordovician carbonates from the Yangtze Block, southwestern China[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2013,56(2):579-591. |
| APA | Liu Cheng-Ying,Li Shi-Hu,Deng Cheng-Long,&Zhu Ri-Xiang.(2013).On the mechanism of remagnetization of Ordovician carbonates from the Yangtze Block, southwestern China.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,56(2),579-591. |
| MLA | Liu Cheng-Ying,et al."On the mechanism of remagnetization of Ordovician carbonates from the Yangtze Block, southwestern China".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 56.2(2013):579-591. |
入库方式： OAI收割
来源：地质与地球物理研究所
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