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，规划了分布于东北中国地区火山口湖前的火山沉积岩芯采样。在中国地质大学(北京)、海伦店研究机构和政府机构的合作下，我们对中国东北部的龙岗火山岩田、五大连池火山岩田和阿尔山火山岩田进行了S野外考察。利用简化后的岩心，从西太平洋地区的五大连池-滕池(火山湖)采集了表层沉积岩芯。我们已经确认，五大连池下岩心沉积物可能是将放射性碳定标曲线延伸到末次冰期的关键区域。在内蒙古的AVF内，有8个火山口湖泊，水深在37米到100米之间。我们从两个陨石坑采集短的(2-4米)沉积物岩心。冬季湖泊(阿尔山·特奇和布基·瓦什占·芬奇)，作为一项初步挑战。证实了冰上沉积物岩心取样是保护环境和岩心运输的有效途径，将该方法应用于五大连池天池岩心沉积物取样是可行的。这些样品可能对将放射性碳定标曲线延伸到末次冰期以及高分辨率分析中国东北部的气候变化具有重要意义。此外，我们还对放射性碳的测定方法进行了改进。在善意的帮助下，对保存在沉积物岩心中的有机质进行测年。凯克碳循环加速器质谱学实验室。本研究开发的协议已在多项研究中得到应用。为了对保存在岩心沉积物中的有机样品进行高精度、高准确度的测量，需要对末次冰期的放射性碳定标曲线进行改进。

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.