萨拉乌苏河流域末次间冰期全球变化区域响应的主元素记录  

Major Element Record in Salawusu River Valley Responding to Global Change during Last Interglacial Period

作　　者：吕玉晓[1] 李保生[1] 靳鹤龄[2] David Dian ZHANG 余雪飞[1] 

机构地区：[1]华南师范大学地理系 [2]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [3]香港大学地理与地质学系

出　　处：《中国沙漠》2004年第2期136-143,共8页Journal of Desert Research

基　　金：国家自然科学基金资助项目(49971009);中国科学院知识创新工程重要方向项目(KZCX2 SW 118);国家重点基础研究发展规划项目(G2000048701)共同资助

摘　　要：萨拉乌苏河流域米浪沟湾剖面末次间冰期层系记录了8 5个风成的古砂丘砂与河湖相或／和古土壤构成的沉积旋回。通过对该层系主元素含量分布规律的分析,认为所述沉积旋回主要是由干湿寒暖气候旋回波动所致。研究亦表明,末次间冰期层系60LS—82S可进一步划分为5个层段,它们在时间和气候的主要阶段上与氧同位素5阶段中之5a、5b、5c、5d、5e诸亚段相近。不仅如此,若干反映冷干气候的风成砂丘砂堆积层位与末次间冰期GRIP冰芯δ18O及西太平洋暖池planktonicδ18O记录的冷凉事件,特别是与黄土高原记录的9次粉尘事件在时间上具有很好的对应关系。The last interglacial strata sequence of Milanggouwan stratigraphic section in the Salawusu River valley has recorded 8^5 sedimentary cycles of aeolian sand alternatively interlaid with fluvio-lacustrine facies or paleosols. After analyzing the distributing regularity of major element contents in the strata, we considered that these sedimentary cycles were chiefly induced by cold-dry and warm-humid climate fluctuations. The study also showed that in the Milanggouwan section, the 60LS-82S depositional sequence formed during the last interglacial period can be further divided into five phases which closely match δ^(18)O5a?δ^(18)O5b?{δ^(18)O5c}?δ^(18)O5d?δ^(18)O5e in periods and chief climatic stages. Moreover, many horizons of paleo-sand-dune reflecting cold|dry climate temporally corresponded to those cold events recorded by δ^(18)O in GRIP Ice Core and planktonic δ^(18)O in the warm pool of the Western Pacific Ocean, especially to the 9 aeolian dust (loess) events happened in the Loess Plateau of China during the Last Interglacial period.

关 键 词：末次间冰期 地层学 沉积旋回 年龄测定 主元素 气候变化 

分 类 号：P532[天文地球—古生物学与地层学] P512.2[天文地球—地质学]