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DOI | 10.3969/j.issn.0001-5733.2010.05.020 |
Magnetostratigraphy and palaeoclimatic significance of Late Neogene aeolian sequence of Lanzhou area | |
Han Fei; Sun Dong-Huai; Zhang Yan; Chen Fa-Hu![]() | |
发表日期 | 2010 |
ISSN | 0001-5733 |
卷号 | 53期号:5页码:1179-1186 |
英文摘要 | Lanzhou area is located on the northwestern brim of the Loess Plateau and the northeastern margin of the Tibetan Plateau, where the Tertiary strata have special significance to the study of aeolian deposition and uplift of the Tibetan Plateau. Gaolan Hill section is in the southern Lanzhou City with a total thickness of 240 m. 422 paleomagnetic block samples were obtained from the field with an approximate spacing interval of 0. 5 m (local refinement). All samples were demagnetized in a thermal demagnetiser systematically, and then the Nature Remanent Magnetization (NRM) was subsequently measured using a superconducting magnetometer from room temperature to 500 degrees C in 50 degrees C steps. The results show that the measured polarity column of the top strata of the Gaolan Hill section contains two large segments of negative polarity with four small segments of normal polarity events in between, which is consistent with the typical characteristic of the Gilbert Chron, and the normal polarity of the two ends corresponds to Chron2A. 3n and Chron3An. in respectively. The palaeomagnetic age of the Gaolan Hill section was determined ultimately as 6 similar to 3. 5 Ma. Based on this chronological frame, the initial accumulation of Wuquan conglomerate was approximately at 3. 5 Ma, indicating a strong uplift of the,Tibetan Plateau, namely the Phase A of the Tibetan movement. The lithologic characters changed from fluviolacustrine sandstone to aeolian Red Clay with thin interval of greyish-white sand layers at the depth of 602 m. It can be inferred from the rock strata and age that the development age of aeolian sequence in Lanzhou area was 7 Ma at least, which is in accordance with the bottom age (7 similar to 8 Ma) of the aeolian sequence of the eastern and central Loess Plateau, suggesting that their accumulation processes are unitary. |
英文关键词 | Lanzhou area;Aeolian sequence;Magnetostratigraphy;Late Neogene;Uplift of Tibetan Plateau |
语种 | 中文 |
WOS研究方向 | Geochemistry & Geophysics |
WOS类目 | Geochemistry & Geophysics |
WOS记录号 | WOS:000278169100020 |
来源期刊 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
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来源机构 | 兰州大学 ; 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/2012 |
推荐引用方式 GB/T 7714 | Han Fei,Sun Dong-Huai,Zhang Yan,et al. Magnetostratigraphy and palaeoclimatic significance of Late Neogene aeolian sequence of Lanzhou area[J]. 兰州大学, 中国科学院青藏高原研究所,2010,53(5):1179-1186. |
APA | Han Fei.,Sun Dong-Huai.,Zhang Yan.,Chen Fa-Hu.,Wang Fei.,...&Hu Wen-Wei.(2010).Magnetostratigraphy and palaeoclimatic significance of Late Neogene aeolian sequence of Lanzhou area.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,53(5),1179-1186. |
MLA | Han Fei,et al."Magnetostratigraphy and palaeoclimatic significance of Late Neogene aeolian sequence of Lanzhou area".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 53.5(2010):1179-1186. |
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