萨拉乌苏河流域MGS1层段粒度与CaCO3记录的全新世千年尺度的气候变化

摘要/Abstract

摘要： 毛乌素沙漠东南缘萨拉乌苏河流域米浪沟湾剖面MGS1层段含有11个由古沙丘砂与河湖相或古土壤构成的沉积旋回。通过对该层段粒度和CaCO3的分析,发现其河湖沼相和古土壤的平均粒径、分选系数、偏度和峰态的值明显高于古沙丘砂;CaCO3含量在古沙丘砂及其上覆的河湖相和古土壤中依次变化于0.07%~0.32%（平均值为0.16%）、0.05%~1.50%（0.27%）和0.06%~1.42%（0.64%）,并与平均粒径呈显著相关（相关系数0.8）;构成与沉积旋回波动韵律相同的11个峰谷交替的粒度和CaCO3旋回,指示了全新世气候冷、暖的变化过程和东亚冬夏季风千年尺度交替变化的气候旋回。这些旋回中的冬季风主导时期可与北大西洋8 200、5 000、4 000、2 700、1 400 a BP等寒冷事件进行对比,和中国若干地点的气候波动具有良好对应关系,可能表明全新世东亚季风在全球大气、海洋、陆地和全球冰量变化的共同作用下,表现为干冷冬季风和暖湿夏季风的相互交替的千年尺度的气候变化特征。

关键词: 萨拉乌苏河流域, MGS1层段, 粒度, CaCO3, 全新世千年尺度气候变化

Abstract: The MGS1 segment of the Milanggouwan stratigraphical section in the Salawusu River Valley, southeast of the Mu Us Desert in China, records 11 sedimentary cycles consisting of alternations between dune sands and fluviolacustrine or paleosols. Based on analysis of grain size and CaCO3 content, we find that the values of mean grain size (Mz), sorting coefficient (σ1), skewness (Sk1), kurtosis (KG) in the dune sands are lower than those in the fluviolacustrine or paleosols, and the CaCO3 contents range from 0.07% to 0.32% (average 0.16%) in the dune sands, 0.05% to 1.50% (average 0.27%) in the fluviolacustrine and 0.06% to 1.42% (average 0.64%) in the paleosols, and the CaCO3 contents have a significant correlation with Mz (R=0.8053); eleven CaCO3 content variation cycles and grain size change cycles indicate the Holocene cold/warm variation and millennial scale Winter/Summer Monsoon variations in East Asia. The periods dominated by winter monsoon correspond well to the cold events occurred at 8 200, 5 000, 4 000, 2 700 and 1 400 a BP recorded in the North Atlantic deep sea sediments, and have significant correlation with climate change in some places in China. The study shows that the variation of East Asian monsoon during the Holocene is manifested as millennial scale alternations of cold-arid winter monsoon with warm-wet summer monsoon.

Key words: MGS1 segment, grain size, CaCO3, Holocene millennial scale climate variations, Salawusu River Valley, the Mu Us Desert

中图分类号:

P532

王丰年, 李保生, 牛东风, 李志文, 温小浩, 司月君, 杜恕环, 郭亿华. 萨拉乌苏河流域MGS1层段粒度与CaCO3记录的全新世千年尺度的气候变化[J]. 中国沙漠, 2012, 32(2): 331-339.

WANG Feng-nian, LI Bao-sheng, NIU Dong-Feng, LI Zhi-wen, WEN Xiao-hao, SI Yue-jun, DU Shu-huan, GUO Yi-hua. Holocene Millennial Scale Climate Variations from Records of Grain Size and CaCO3 in MGS1 Segment of Milanggouwan Section in the Salawusu River Valley, China[J]. JOURNAL OF DESERT RESEARCH, 2012, 32(2): 331-339.

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