| 萨拉乌苏河流域MGS2层段粒度与CaCO3记录的千年尺度气候变化 |
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| 引用本文： | 王丰年,李保生,王江龙,牛东风,温小浩,李志文,司月君,杜恕环.萨拉乌苏河流域MGS2层段粒度与CaCO3记录的千年尺度气候变化[J].地理科学,2012(5):596-602. |
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| 作者姓名： | 王丰年 李保生 王江龙 牛东风 温小浩 李志文 司月君 杜恕环 |
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| 作者单位： | 华南师范大学地理科学学院;中国科学院地球环境研究所黄土与第四纪地质国家重点实验室;广东省汕头市澄海中学;东华理工大学地球科学学院;中国科学院南海海洋研究所 |
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| 基金项目： | 国家自然科学基金(编号49971009,40772118);国家重点基础研究发展计划(973计划)(编号2010CB833405)资助 |
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| 摘 要： | 测定、分析毛乌素沙漠东南缘萨拉乌苏河流域米浪沟湾剖面MGS2层段的粒度与CaCO3,发现该层段不同沉积相粒度Mz和σ呈现峰谷变化,CaCO3含量在沙丘砂及其上覆的河流相和湖沼相中依次变化于0-2.94%(平均值0.39%)、0.14%-2.68%(1.43%)和0.39%-15.57%(8.82%),并与Mz呈显著相关,构成与沉积旋回波动韵律相同的5.5个峰谷交替的粒度与CaCO3旋回。研究表明,毛乌素沙漠冬季风盛行时期沙丘砂强烈堆积,CaCO3发生迁移;夏季风盛行时期河流相和湖沼相发育,粉砂和粘土含量增加,CaCO3相对聚集。这些旋回代表东亚冬夏季风千年尺度交替变化的气候旋回。
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| 关 键 词： | 萨拉乌苏河流域 MGS2层段 CaCO3 粒度 千年尺度气候变化 |
Millennium-scale Climate Variations from the Record of Grain-size and CaCO3 During the Pleniglacial in the Salawusu River Valley,China |
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| WANG Feng-nian,LI Bao-sheng,WANG Jiang-long,NIU Dong-feng,WEN Xiao-hao,LI Zhi-wen,SI Yue-jun,DU Shu-huan.Millennium-scale Climate Variations from the Record of Grain-size and CaCO3 During the Pleniglacial in the Salawusu River Valley,China[J].Scientia Geographica Sinica,2012(5):596-602. |
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| Authors: | WANG Feng-nian LI Bao-sheng WANG Jiang-long NIU Dong-feng WEN Xiao-hao LI Zhi-wen SI Yue-jun DU Shu-huan |
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| Affiliation: | 1.School of Geography,South China Normal University,Guangzhou,Guangdong 510631,China;2.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an,Shaanxi 710061,China;3.Chenghai Middle-school,Shantou,Guangdong 515800,China;4.College of Earth Science,East China Institute of Technology,Nanchang,Jiangxi 330013,China;5.Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou,Guangdong 510301,China) |
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| Abstract: | The MGS2 segment of the Milangguowan stratigraphical section in the Salawusu River Valley,southeast of China’s Mu Us Desert,records 5.5 sedimentary cycles consisting of dune sands alternating with fluvial or lacustrine facieses.Based on the grain-size and CaCO3 analysis,it was found that Mz and σ appear peaks and valleys in different sedimentary facieses.CaCO3 contents range from 0 to 2.94%(average 0.39%) in the dune sands,0.14% to 2.68%(average 1.43%) in the fluvial facieses and 0.39% to 15.57%(average 8.82%) in the lacustrine,and appear 5.5 grain-size and CaCO3 cycles similar to the sedimentary facieses changes.And the CaCO3 contents have a significant correlation with Mz.The result show that the dune sands accumulate and CaCO3 moved greatly during the periods with a strong cold-dry winter monsoon.Whereas,the fluvial or lacustrine facieses developed,silt and clay increased and CaCO3 gathered largely when the warm-humid summer monsoon strengthened.The observed climate fluctuations on millennium-scale during the Pleniglacial to the alternations attributed the strength of the East Asian winter and summer monsoons. |
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| Keywords: | Salawusu River Valley MGS2 segment grain-size and CaCO3 content millennium-scale climate variations |
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