CAJ | 학술논문

青藏高原内陆封闭湖泊的水体演化是古气候变化的良好地质载体,其中湖泊古湖岸线变迁蕴含了丰富的地质信息,对其识别和研究是认识导致湖泊退缩的气候或构造变化的关键.色林错是青藏高原第二大内陆湖泊,保存了一系列古湖岸线.我们对色林错东北岸保存完好的古湖岸线进行了研究.对这些古湖岸线样品中的石英颗粒使用单片再生法(Single aliquot regeneration)进行OSL测年,测定年龄分别为12.2±0.8 ka、6.3±0.4 ka和2.3±0.2 ka.表明色林错在约12.2 ka、6.3 ka和2.3 ka±至少出现了3次阶段性湖泊收缩过程.
청장고원내륙봉폐호박적수체연화시고기후변화적량호지질재체,기중호박고호안선변천온함료봉부적지질신식,대기식별화연구시인식도치호박퇴축적기후혹구조변화적관건.색림착시청장고원제이대내륙호박,보존료일계렬고호안선.아문대색림착동북안보존완호적고호안선진행료연구.대저사고호안선양품중적석영과립사용단편재생법(Single aliquot regeneration)진행OSL측년,측정년령분별위12.2±0.8 ka、6.3±0.4 ka화2.3±0.2 ka.표명색림착재약12.2 ka、6.3 ka화2.3 ka±지소출현료3차계단성호박수축과정.
The evolution of inland lakes in Tibet Plateau provides important information about past climatic change. The retreating processes of lake shorelines can be used to infer lake evolutions forced either by tectonic events or climatic change. Identification of the past shorelines is very important in the recognition of climate and tectonic events. In this paper,we focused on studying the lake of Siling Co,which is the second largest inland lake in Tibet Plateau. Our field investigations indicate that well-preserved shorelines can be found in the northeastern bank of this lake. By using single-aliquot regenerative-dose(SAR)protocol method,we yielded three ages for the past shorelines,which imply that stepwise retreating of the lake occurring at 12.2 ka, 6.3 ka and 2.3 ka,respectively.