Hematite Record of 3 Ma Loess-Red Clay Sequences in the Central Chinese Loess Plateau 3 Ma and Its Paleoclimatic Significance
详细信息
- 责任者：Li Xiangyu (Key Laboratory of Continental Collision and Plateau Uplift ; Institute of Tibetan Plateau Research ; Chinese Academy of Sciences ; Beijing 100101 ; China) ; Fang Xiaomin
- 刊名：Quaternary Sciences
- 出版年：2012
- 卷期：32(4)
- 关键词：黄土 ; loess ; 红粘土 ; red clay ; 古气候 ; paleoclimate ; 黄土高原 ; Loess Plateau
- 页码：p.700-708
- 图表：4 illus., 1 table, 72 refs.
- 分类号：1400
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
The authors focus on Chaona red clay-loess section in CLP to see the change of hematite content spanning the last 3 Ma.The study area is located near the town of Chaona(35°7’N,107°12’E) in the Central CLP.Through DRS analysis and the application of hematite index,the authors obtain continuous record of hematite in CLP since the past 3 Ma.It’s possible that the excessive organic content in paleosol lays leads to the abnormal low hematite content and unusual high magnetism susceptibility in these layers,considering the fact that there is more organic matter in S1～S5 than underlying section in CLP generally. And the trend of significant gradual decrease of hematite content explores the general evolution of paleoclimate in CLP tending to be cooler and drier,especially at the time of 2.5 Ma,1.5 Ma,0.6 Ma and 0.15 Ma,which is agreed with records of particle size analysis,pollen and biomarker in Chaona section.