| 我国东北地区黄土堆积的磁性地层年代与古气候变化 |
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| 引用本文： | 曾琳,鹿化煜,弋双文,徐志伟,邱志敏,杨振宇,李永祥.我国东北地区黄土堆积的磁性地层年代与古气候变化[J].科学通报,2011,56(27):2267-2275. |
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| 作者姓名： | 曾琳 鹿化煜 弋双文 徐志伟 邱志敏 杨振宇 李永祥 |
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| 作者单位： | 南京大学地理与海洋科学学院气候与全球变化研究院;南京大学地球科学与工程学院; |
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| 基金项目： | 国家自然科学基金重点项目(40930103)、国家自然科学基金委员会创新研究群体科学基金(41021002)、国家自然科学基金青年科学基金(40902045); 国家全球变化重大专项(2010CB950203)资助 |
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| 摘 要： | 我国东北地区有较广泛的黄土分布, 是环境变化的重要地质记录. 长期以来, 由于缺乏可靠的年代学证据, 对这里黄土沉积及其记录的古气候变化了解不多. 在广泛野外踏勘的基础上, 对具有代表性的科尔沁沙地南缘牛样子沟和平安村黄土剖面进行了磁性地层与光释光年代等测试, 结果表明, 牛样子沟剖面的B/M 界限位于深度27 m 处, 平安村剖面处于布容正极性期. 基于光释光年龄和磁性地层年代计算的黄土沉积速率外推, 科尔沁沙地南缘的黄土堆积应早于1.0 Ma. 黄土是半干旱环境下的粉尘堆积, 指示东北地区的半干旱气候至少在早更新世晚期已经开始. 这里黄土开始堆积的年代对应于中更新世全球气候转型, 可能为全球气候变冷驱动了亚洲内陆干旱化和较快粉尘堆积的假说提供了证据.
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| 关 键 词： | 中国东北 科尔沁沙地 黄土 磁性地层 古气候 |
| 收稿时间： | 2011-04-15 |
Magnetostratigraphy of loess in northeastern China and paleoclimatic changes |
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| ZENG Lin,LU HuaYu,YI ShuangWen,XU ZhiWei,QIU ZhiMin,YANG ZhenYu & LI YongXiang School of Geographic , Oceanographic Sciences,Institute for Climate , Global Change Research,Nanjing University,Nanjing ,China, School of Earth Sciences , Engineering.Magnetostratigraphy of loess in northeastern China and paleoclimatic changes[J].Chinese Science Bulletin,2011,56(27):2267-2275. |
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| Authors: | ZENG Lin LU HuaYu YI ShuangWen XU ZhiWei QIU ZhiMin YANG ZhenYu & LI YongXiang School of Geographic Oceanographic Sciences Institute for Climate Global Change Research Nanjing University Nanjing China School of Earth Sciences Engineering |
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| Institution: | ZENG Lin1,LU HuaYu1,YI ShuangWen1,XU ZhiWei1,QIU ZhiMin1,YANG ZhenYu2 & LI YongXiang2 1 School of Geographic and Oceanographic Sciences,Institute for Climate and Global Change Research,Nanjing University,Nanjing 210093,China,2 School of Earth Sciences and Engineering |
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| Abstract: | Loess is widely distributed in northeastern China, and is an important geological record of past environmental change. For many years, the lack of a reliable chronology for this set of eolian dust-derived sediments has impeded our understanding of the paleoclimatic evolution and the land surface processes in this region. In this study, an extensive field survey of loess deposits was carried out, and two typical profiles at Niuyangzigou (NYZG) and Pinancun (PAC) were selected for detailed magnetostratigraphy... |
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| Keywords: | Northeastern China Horqin dune field loess magnetostratigraphy paleoclimate |
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