Magnetism of the Huguangyan Maar Lake sediments, Southeast China and its paleoenvironmental implications
文献类型：SCI/SSCI论文
| 作者 | Duan Z. Q. ; Liu Q. S. ; Yang X. Q. ; Gao X. ; Su Y. L. |
| 发表日期 | 2014 |
| 关键词 | Huguangyan Magnetic minerals Lake catchment Indian summer monsoon resolution pollen record east-asian monsoon loess plateau environmental magnetism loess/paleosol sequence hysteresis properties bacterial magnetite holocene sediments winter monsoon soil color |
| 英文摘要 | The Huguangyan (HGY) lake, a typical maar lake in the southeast of China, is sensitive to the evolution of the Asian monsoon system, including the East Asian summer monsoon (EASM) and the Indian summer monsoon (ISM). So far, the mechanism of how magnetic properties of the HGY lake sediments respond to climate changes has not been well determined. In this study, we performed a detailed mineral-magnetic analysis on the highresolution HGY sediments. Results revealed that finer-grained magnetite (superparamagnetic and single domain magnetite mixed with a small amount of goethite and hematite) is the dominant magnetic mineral, which is consistent with the magnetic properties of the red weathered soils collected from the catchments, but differs greatly from that of the aeolian inputs. Therefore, magnetic minerals of the HGY sediments were originated mainly from the lake catchment, rather than the wind-blown dust inputs. Considering the high tephra wall (relative elevation of 10-20 m) and great precipitation, surface runoff by rainfall is interpreted as the main process to transport red soils into the lake. The magnetic records of HGY sediments revealed that the summer monsoon was enhanced at the early Holocene and then declined abruptly at the mid-late Holocene (similar to 5.5 kyr cal. BP). This pattern strongly mimics the evolution pattern of ISM, but is inconsistent with the EASM. Thus, we suggest that the magnetic records from HGY have the great potential to investigate the evolution of ISM. (c) 2014 Elsevier B.V. All rights reserved. |
| 出处 | Palaeogeography Palaeoclimatology Palaeoecology |
| 卷 | 395 |
| 页 | 158-167 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0031-0182 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/29908]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Duan Z. Q.,Liu Q. S.,Yang X. Q.,et al. Magnetism of the Huguangyan Maar Lake sediments, Southeast China and its paleoenvironmental implications. 2014. |
入库方式： OAI收割
来源：地理科学与资源研究所
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