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

为了将放射性碳标准曲线延长到末次冰期，我们计划在中国东北地区的火山口湖附近进行火山沉积物的岩心取样。在中国地质大学（北京）、黑龙江省普罗维登斯研究机构和政府机构的合作下，我们在中国东北地区的龙岗、五大连池和阿尔山火山区进行了野外研究。利用简化的岩心，对五大连池火山湖表层沉积物进行了取样。证实五大连池沉积物的底层可能是将放射性碳标准曲线延长到末次冰期的关键区域。在内蒙古AVF内，有8个火山口湖，水深在-37米之间。我们采取短（2- 4米）沉积物芯从两个火山口。在冬季，我们将在阿尔山湖和布奎湖（Bouqui washzhan fenchi）中进行一次试验，作为初步的挑战。证实了冰上取芯是一种环境保护和取芯器运输的有效方法，将其应用于五大连池水库沉积物的冰上取芯是有意义的。阿尔山天池和Bouquiwashzhantenchi的这些样品可能对延长放射性碳校准曲线至末次冰期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。沉积物岩心中保存的有机物的年代测定。本文对白亮M.凯克碳循环加速器质谱实验室。在这项研究中开发的协议已被应用到几项研究。为了使高精度和高精度的测量应用于沉积物中保存的有机样品，末次冰期时期的放射性碳标准曲线需要改进。

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.