CAJ | 학술논문

酒坊台剖面位于萨拉乌苏河流域下游，其中末次间冰阶以来主要为风成砂沉积，间夹砂质古土壤和湖沼相粘土层等，对环境信息有良好的记录。OSL年龄结果表明该剖面顶部记录了末次冰期间冰阶（约52 ka B.P.）以来的气候演化历史。通过对剖面高精度的粒度和磁化率分析，结合Rb、Sr元素含量及其比值综合分析，表明末次冰期间冰阶以来该剖面自上而下可划分为3个主要层段，对应了深海氧同位素MIS 1~3。同时在MIS 3阶段呈现出明显的MIS 3a、3b、3c亚段，结合区域研究资料，表明萨拉乌苏河流域在中—长时间尺度上，对全球性和区域性气候事件有良好的沉积响应。
주방태부면위우살랍오소하류역하유，기중말차간빙계이래주요위풍성사침적，간협사질고토양화호소상점토층등，대배경신식유량호적기록。OSL년령결과표명해부면정부기록료말차빙기간빙계（약52 ka B.P.）이래적기후연화역사。통과대부면고정도적립도화자화솔분석，결합Rb、Sr원소함량급기비치종합분석，표명말차빙기간빙계이래해부면자상이하가화분위3개주요층단，대응료심해양동위소MIS 1~3。동시재MIS 3계단정현출명현적MIS 3a、3b、3c아단，결합구역연구자료，표명살랍오소하류역재중—장시간척도상，대전구성화구역성기후사건유량호적침적향응。
The Salawusu River Valley, located in the transition zone between the loess plateau and the Mu Us desert, has kept sensitive records of paleoclimate since the last interglacial period. The profile which contains the aeolian sand with some interbeddings of sandy soil and limnetic paleosol facies in the downstream part of the valley was recently termed Jiufangtai Stratigraphic Section. In this paper, the authors focused the study on the top section since the interstadial epoch of the last glaciation and employed a series of geological methods, such as the AMS-14C, OSL dating method, grain size, magnetic susceptibility, Rb, Sr elements and their ratios. Based on the data obtained and the climatic-stratatigraphic comparison with the relative marine isotope stage, the authors further divided the strata into the following sequences:(1) the MIS 1 sequence (0~11 ka B.P.), which was a mainly dry period at the beginning of the Holocene, consistent with records from the arid-semiarid transition zones in other places. And the 1.5~1.8 cal ka B.P. was a wet phase when the modern Salawusu River formed;(2) MIS 2 sequence (11~28 ka B.P.), which was a lasting and stable dry and cold period; (3) MIS 3 sequence (28~52 ka B.P.), which mainly contained 2 warm and humid periods (MIS 3a and MIS 3c), and a cold period (MIS 3b), similar to things of MIS 1. The lacustrine facies in MIS3 sequence was similar to the particular warm and wet stage in the Tibetan Plateau and its adjacent areas, which recorded the strong summer monsoon event during 30~40 ka B.P.. It is concluded that the paleoclimatic records had a comparable sedimentary response to the global and regional climate events. Thus, the valley is an ideal zone for studying climate changes in China. In addition, some comprehensive analysis should be conducted in the reconstruction of the valley paleoenviroment history, because there are varying degrees of limitations in different assumptions.