Climate Change Data Portal
DOI | 10.1016/j.jseaes.2019.05.010 |
Sedimentary dynamics and climatic implications of Cretaceous loess-like red beds in the Lanzhou basin, Northwest China | |
Chen, Jiasheng1; Liu, Xiuming1,2; Liu, Xiaojing1 | |
发表日期 | 2019 |
ISSN | 1367-9120 |
EISSN | 1878-5786 |
卷号 | 180 |
英文摘要 | The Chinese loess has been widely studied in order to reconstruct Cenozoic environmental change. Cretaceous loess-like red beds with alternating red and gray layers in the Lanzhou basin, Northwest China are well preserved and can be used for understanding the Mesozoic environmental and climatic changes. However, the red beds and gray clays are less studied and their significance is not clear. Hence, Cretaceous red beds of the basin are studied. The gray layers show horizontal lamination and are deposited in a lacustrine environment, whereas the red layers show gradational change in texture and color, and are analogous to paleosols. The red and gray clays show similar immobile trace elemental compositions and identical grain size distributions, suggesting that the sediments of the two deposits are derived from the same source and carried by identical transporting forces. The dominant 2-10 mu m fine grain size component indicates that the deposits are sorted through long-distance transportation. In this context, the magnetic properties of the red beds are mainly determined by post-depositional environmental development. Hematite is the dominant magnetic mineral and some of the gray layers contains small quantities of magnetite. Therefore, the red and gray layers develop on land and under water, respectively. The magnetic parameter IRM-100mT eliminates the effects of ferromagnetic minerals and is sensitive to hard magnetic minerals. Thus, it can be used as a proxy for paleoclimatic change. Its high values in the red layers correspond to a drier paleoclimatic environment. |
WOS研究方向 | Geology |
来源期刊 | JOURNAL OF ASIAN EARTH SCIENCES
![]() |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/101925 |
作者单位 | 1.Fujian Normal Univ, Inst Geog Sci, Minist Sci & Technol & Fujian Prov Funded, Key Lab Subtrop Mt Ecol, Fuzhou 350007, Fujian, Peoples R China; 2.Macquarie Univ, Dept Environm & Geog, Sydney, NS 2109, Australia |
推荐引用方式 GB/T 7714 | Chen, Jiasheng,Liu, Xiuming,Liu, Xiaojing. Sedimentary dynamics and climatic implications of Cretaceous loess-like red beds in the Lanzhou basin, Northwest China[J],2019,180. |
APA | Chen, Jiasheng,Liu, Xiuming,&Liu, Xiaojing.(2019).Sedimentary dynamics and climatic implications of Cretaceous loess-like red beds in the Lanzhou basin, Northwest China.JOURNAL OF ASIAN EARTH SCIENCES,180. |
MLA | Chen, Jiasheng,et al."Sedimentary dynamics and climatic implications of Cretaceous loess-like red beds in the Lanzhou basin, Northwest China".JOURNAL OF ASIAN EARTH SCIENCES 180(2019). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。