Magnetostratigraphy and palaeoclimatic significance of Late Neogene aeolian sequence of Lanzhou area

doi:10.3969/j.issn.0001-5733.2010.05.020

	Magnetostratigraphy and palaeoclimatic significance of Late Neogene aeolian sequence of Lanzhou area
	Han Fei 1; Sun Dong-Huai 1; Zhang Yan 1; Chen Fa-Hu 1; Wang Fei 1; Zhu Yan-Hu 2; Zhang Yue-Bao 1; Yi Zhi-Yu 3; Li Zai-Jun 1; Hu Wen-Wei 1
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2010-05-01
卷号	53 期号:5 页码:1179-1186
关键词	Lanzhou Area Aeolian Sequence Magnetostratigraphy Late Neogene Uplift Of Tibetan Plateau
ISSN号	0001-5733
DOI	10.3969/j.issn.0001-5733.2010.05.020
文献子类	Article
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.
WOS关键词	TIBETAN PLATEAU ; YELLOW-RIVER ; UPLIFT ; DISCOVERY ; DEPOSITS ; MONSOON ; CHINA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000278169100020
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72656]
专题	中国科学院地质与地球物理研究所
通讯作者	Han Fei
作者单位	1.Lanzhou Univ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China 2.Geol Survey Gansu Prov, Lanzhou 730000, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
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]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,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.