Sampling of varve sediment from volcanic craters in NE China for extending ^<14>C calibration curve

将放射性碳定标曲线延伸至末次冰期，对分布于中国东北地区的火山湖前缘的湖泊沉积物进行了岩心采样。在中国地质大学（北京）和中国黑龙江省的研究机构和政府机构的合作下，我们对中国东北的三个火山带进行了5次实地考察；龙岗火山场、五大连池火山场和阿尔山火山场。本文采用简化岩心法对武大莲池火山湖进行了表层沉积物岩心采集。证实了五大连池天池下芯沉积物可能是将放射性碳定标曲线延伸至末次冰期的关键区域。在内蒙古的AVF内，有8个水深在- 37m之间的火山口湖。我们从两个火山口取短（2-4m）的沉积物岩心。冬季湖泊（阿尔山天池和布基washzhan fen池），作为初步挑战。研究结果表明，冰上岩心取样是一种有效的环境保护和覆盖物迁移的方法，该方法在五大连池天池岩心取样中具有一定的应用价值。鄂尔山天池和布基沃山天池的样品可能对延长末次冰期的放射性碳校准曲线以及高分辨率分析中国东北地区的气候变化具有重要意义。此外，我们还改进了放射性碳的测定方法。沉积物岩心中保存有机物的年代测定。凯克碳循环加速器质谱实验室本研究制定的方案已应用于多项研究。为了对岩心沉积物中保存的有机样品进行高精度测量，末次冰期的放射性碳定标曲线需要改进。

Tb extend radiocarbon calibration curve to the last glacial period, we have planed the core sampling of verve sediments froni the volcanic crater lakes distributed in NE China. With the collaborations of China Geological University (Beijing), and research and governmental organizations in Heilondiang providence in China, we had s field researches in three volcanic fields in the northeastern China; Long Gang volcanic field, Wudalianchi volcanic field (WVF) and the Aershan volcanic field (AVF). We took surfiice sediment cores from the Wudalianchi tenchi (volcanic lakes) in WVF using the simplified cores. We have confirmed that the downcore sediment of Wudalianchi tenchi may be a key area for extending radiocarbon calibration curve to last glacial period. Within AVF in Inter Mongolia, eight crater lakes with water depths between and 37m are located. We take short (2-4m) sediments cores from two crater. lakes (Aershan tenchi and Bouqui washzhan fenchi) in winter season, as a preliminary challenge. We confirmed that the sediment core sampling on the ice is an effective approach fir environmental protection and transport of corer It should be edsctive to apply this method to the core sediment sampling form from the Wudalianchi tenchi. These samples from Aershan tenchi and Bouqui washzhan tenchi might be important for extending radiocarbon calibration curve to last glacial period as well as high-resolution analysis of climatic changes in the northeastern China. In addition, we have improved the method for radiocarbon. dating of organic matters preserved in sediment cores with a kind help. of W. M. Keck Carbon Cycle Accelerator Mass Spectrometry Laboratory. The protocol developed in this research has been applied to several researches. For applying the high precision and accuracy measurements to the organic samples preserved in the core sediments, the radiocarbon calibration curve in the term of last glacial period should be improved.