CAJ | 학술논문

为了探讨中更新世以来南极半岛东北部鲍威尔海盆沉积环境气候演变及古流向特征，对采自南极半岛东北部鲍威尔海盆内一根3 m长的柱样进行了古地磁和磁组构参数测试和特征分析。结果表明：（1）该柱样在2．73 m处为布容正极性与松山反极性期的界线，由此推算出在距今780 ka到现代该区域沉积速率较低，约为0．35 cm·ka-1；（2）中更新世以来该区域共出现过5次暖沉积事件，并且在暖期事件中存在3次明显的冷期气候波动事件；（3）该区域在暖期古流向方向不明显，水流方向变化频繁，而在暖期之间的过渡时期，古流向以近似南北向为主。
위료탐토중경신세이래남겁반도동북부포위이해분침적배경기후연변급고류향특정，대채자남겁반도동북부포위이해분내일근3 m장적주양진행료고지자화자조구삼수측시화특정분석。결과표명：（1）해주양재2．73 m처위포용정겁성여송산반겁성기적계선，유차추산출재거금780 ka도현대해구역침적속솔교저，약위0．35 cm·ka-1；（2）중경신세이래해구역공출현과5차난침적사건，병차재난기사건중존재3차명현적랭기기후파동사건；（3）해구역재난기고류향방향불명현，수류방향변화빈번，이재난기지간적과도시기，고류향이근사남북향위주。
One 3-m-long gravity core (D4-9)was obtained from the Antartic Powell Basin,which is located in the north-eastern area of the Antarctic Peninsula.Anisotropy of magnetic susceptibility (AMS )and paleomagnetism data were acquired using KLY-3s and 2G superconducting magnetometers.A remarkable plus inclination stage was iden-tified at a depth of 2.73 m and based on the Matsuyama reversed polarity time;we calculated that the sedimentation rate is 0.35 cm·ka-1 from now to 780 ka BP.Five warm climate periods were identified from magnetic suscepti-bility and grain size characteristics in the core,and there are 3 gradual climate transition stages between warm peri-ods,which changed from warm to cold,and then from cold to warm.Based on our AMS analysis,we found that the paleocurrent direction was not obvious in the warm period;it changed frequently,and the approximate paleocurrent direction was north-south in the transition period between the warm periods.