| 云南鹤庆钻孔揭示的西南季风轨道尺度演化 |
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| 引用本文： | 肖海丰,沈吉,肖霞云.云南鹤庆钻孔揭示的西南季风轨道尺度演化[J].第四纪研究,2006,26(2):274-282. |
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| 作者姓名： | 肖海丰 沈吉 肖霞云 |
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| 作者单位： | 中国科学院南京地理与湖泊研究所,南京,210008;中国科学院研究生院,北京,100049;中国科学院南京地理与湖泊研究所,南京,210008 |
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| 基金项目： | 国家高技术研究发展计划(863计划);中国科学院资助项目 |
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| 摘 要： | 文章在运用自动轨道调谐方法确定鹤庆钻孔时间标尺的基础上, 首先分阶段探讨鹤庆钻孔碳酸盐指标的 演化特点, 然后采用频谱分析和滤波分析方法, 通过对鹤庆钻孔碳酸盐沉积记录的分析, 探索西南季风轨道尺度的 演化规律。综合分析结果显示: 天文因素是影响西南季风演化的重要因素, 但并非惟一因素, 西南季风的演化中存在着中更新世转型和1. 55MaB. P. 附近的转型, 后者推测与青藏高原隆升及全球冰体积变化有关; 在西南季风演化的不同阶段出现100ka, 73ka, 66ka, 54ka, 41ka, 30ka, 23ka, 19ka,15ka 和10. 7ka 等周期。
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| 关 键 词： | 西南季风 天文动力 鹤庆盆地 天文调谐 |
| 文章编号： | 1001-7410（2006）02-274-09 |
| 收稿时间： | 2005-09-19 |
| 修稿时间： | 2005-11-20 |
THE ORBITAL SCALE EVOLUTION OF THE SOUTHWEST MONSOON REFLECTED BY THE HEQING CORE IN YUNNAN PROVINCE |
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| Xiao Haifeng,Shen Ji,Xiao Xiayun.THE ORBITAL SCALE EVOLUTION OF THE SOUTHWEST MONSOON REFLECTED BY THE HEQING CORE IN YUNNAN PROVINCE[J].Quaternary Sciences,2006,26(2):274-282. |
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| Authors: | Xiao Haifeng Shen Ji Xiao Xiayun |
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| Institution: | 1 Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008; 2 Graduate University of the Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | Heq ing Basin is located at the junction of southeast Q inghai-Tibetan Plateau and northwest Yunnan-Guizhou Plateau,China.The basin belongs to the southwestmonsoon region,with its environmental evolution deeply affected by the southwestmonsoon.The Heq ing Core lies in the center of the Heq ing Basin.The core is about 737.72m long and dom inated by lacustrine deposits.1989 samples were collected.Carbonate contentwas determ ined by titration.By using automatic orbital tuningmethod to ascertain the time scale of theHeq ing Core,we firstly discussed the evolutionary characters of carbonate content in the core.Three evolutionary stages have been recognized: 2.78~ 1.55MaB.P.,1.55~0.99MaB.P.,and 0.99~0MaB.P.During 2.78~1.55MaB.P.,carbonate content showed a tendency of low value-high value-low value;during 1.55~0.99MaB.P.,the periodic gyration character of carbonate contentwas verymuch outstanding;while from 0.99MaB.P.to 0,fluctuant period of carbonate contentwas evidently longer.W e then adopted Spectral analysis and Filtermethods to analyse carbonate content and explore the regulation of the orbital scale evolution of the southwestmonsoon..The result shows that the astronom ical factor is not the only unique but an important factor for the evolution of the southwest monsoon.Two revolutions,the M id-Pleistocene Revolution and the near 1.55MaB.P Revolution are recognized during the evolutionary history of the southwest monsoon.As for the near 1.55MaB.P.Revolution,it is inferred to be related with the uplift of the TibetPlateau and the change of the global ice volume.Furthermore,there are different cycles such as 100ka,73ka,66ka,54ka,41ka,30ka,23ka,19ka,15ka and 10.7ka in the various stages of the evolution of the southwestmonsoon. |
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| Keywords: | southwest monsoon astronomical factor Heqing Basin astronomical tune |
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