Grain-size Characteristics and Paleoclimate Response of Terrace Sediments in Sandaohe River of Yili Basin
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摘要: 河流成因沉积物中携带了古气候变化和古环境变迁的关键信息。笔者利用三道河剖面的粒度、磁化率特征及光释光（OSL）年龄对其沉积环境进行了探讨。结果表明：粒度频率曲线包括单峰和双峰2种，频率累积曲线以三段式为主，粒度特征反映三道河一级阶地沉积经历了由低能湖泊相→高能河流相→中高能河流相的演变过程；磁化率结果显示H1期间存在最低值，在B-A暖期迅速升高，在YD期间降低-升高-降低。三道河一级阶地形成于晚更新世—全新世早期，完整记录了末次冰消期以来的YD、B-A以及H1三次重大气候变化事件。Abstract: Fluvial sediments carry some key information on paleoclimate and paleoenvironment changes. In this paper, the sedimentary environment of the Sandaohe section is discussed according to the grain size, magnetic susceptibility and OSL age. The results show that the frequency curve of the grain size includes single peak and double peak, and the accumulation frequency curve is mainly three-section type. The characteristics of grain size reflect that the deposition of the first terrace has experienced the evolution process from low-energy lake facies, high-energy river facies to medium-high energy river facies. The results of magnetic susceptibility show that a minimum value appears in H1, a rapid increase in B-A warm period and a decrease-increase-decrease in YD period. The first terrace of Sandaohe formed in late Pleistocene to early Holocene, being the evidence of three major climate change events (YD, B-A and H1) since the last deglaciation.
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Keywords:
- Yili basin /
- grain-size analysis /
- sedimentary environment /
- paleoclimate
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